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Don’t Staple 8734
Form 66
2023
Fiduciary Income Tax Return
State use only
Amended Return? Check the box. For calendar year Mo Day Year Mo Day Year
See page 1 of instructions for reasons to 2023 or fiscal
▪ amend, and enter the number that applies. ▪ year beginning 23 ending
Name of estate or trust State use only Federal Employer Identification Number (EIN)

Name and title of fiduciary Current mailing address of fiduciary (number and street)

City State ZIP Code Foreign country (if not U.S.)

Check all that apply: ▪ Resident Return ▪ Part-Year Resident Return ▪ Nonresident Return ▪ Composite Return
▪ Grantor Trust ▪ Electing Small Business Trust ▪ Qualified Funeral Trust (QFT) ▪ Qualified Disability Trust (QDT)
1. If reporting for an estate:
a. Decedent’s Social Security number b. Decedent’s date of death
c. Was the decedent a resident of Idaho? ................................................................................................ Yes ▪ No
d. If no, enter the state of residence
2. Does this estate or trust have any nonresident beneficiaries? .................................................................... Yes ▪ No
3. Is this a final return? .................................................................................................................................... Yes ▪ No
4. Idaho adjusted income. Enter the amount from Schedule A, page 2, line 19 ............................... 4
5. Income distribution deduction to beneficiaries .............................................................................. ▪ 5
6. Estate tax deduction ...................................................................................................................... ▪ 6
7. Subtract lines 5 and 6 from line 4 .................................................................................................. ▪ 7
8. Qualified business income deduction ............................................................................................ ▪ 8
9. Exemption. See instructions .......................................................................................................... ▪ 9
10. Idaho taxable income. Subtract lines 8 and 9 from line 7 .............................................................. ▪ 10
11. Idaho income tax. Use the Tax Computation Schedule. See instructions ..................................... ▪ 11
12. Donation to Opportunity Scholarship Program .............................................................................. ▪ 12
13. Credits. Enter the amount from Schedule B, page 2, line 6. See instructions .............................. 13
14. Add lines 11 and 12, then subtract line 13. If less than zero, enter zero........................................ ▪ 14
15. Income distribution reportable by beneficiaries. See instructions.................................................. ▪ 15
16. Tax on income distribution. Multiply line 15 by 5.8% ..... ▪ Less credits▪ 16
17. Permanent building fund tax. See instructions. Enter zero if this is a QFT .................................... ▪ 17
18. Total tax from recapture of income tax credits from Form 44, Part II, line 6. Include Form 44 ...... 18
Don’t19. FuelsStapletax due. Include Form 75 ..................................................................................................... 19
20. Sales/use tax due on untaxed purchases (online, mail order, and other) .............................. ▪ 20
21. Tax from recapture of qualified investment exemption. Include Form 49ER ................................. ▪ 21
22. Tax on Electing Small Business Trust or QFT composite return. See instructions ........................ ▪ 22
23. Total tax. Add lines 14 and 16 through 22 ..................................................................................... ▪ 23
24. Estimated tax payments. If made under other EINs, provide EINs, amounts, and rollforwards .......... ▪ 24
25. Idaho income tax withheld. Include Forms W-2 or 1099 ............................................................... ▪ 25
26. Tax paid by affected business entity on your behalf ...................................................................... ▪ 26
27. Special fuels tax refund Gasoline tax refund Include Form 75 ......... 27
28. Tax reimbursement incentive credit. Include certificate ................................................................ ▪ 28
29. Total payments and other credits. Add lines 24 through 28 ........................................................... 29
Refund or Payment Due
30. Tax due. If line 23 is more than line 29, subtract line 29 from line 23 .......................................... ▪ 30
31. Penalty ▪ Interest from the due date ▪ Enter total ....................... 31
32. Nonrefundable credit from a prior year return. See Form 44 instructions ...................................... ▪ 32
33. Total Due. Add lines 30 and 31, then subtract line 32 ................................................................. ▪ 33
34. Overpayment. If line 23 is less than line 29, subtract line 23 from line 29 ........................................... ▪ 34
35. Refund ......... ▪ Apply to 2024 ........... ▪

Continue to page 2.
EFO00036 09-13-2023 Page 1 of 2

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Form 66 2023 (continued)

Schedule A - Computation of Idaho adjusted income
Idaho Amounts
1. Interest and dividend income. Interest ▪ Dividends ▪ Enter total ..... 1
2. Income or (loss). Business ▪ Farm ▪ Enter total ...................... 2
3. Gain or (loss). Capital ▪ Ordinary ▪ Enter total ............................. 3
4. Rents, royalties, partnerships, other estates and trusts, etc. ................................................................... ▪ 4
5. Other income. Include explanation .......................................................................................................... ▪ 5
6. Total income. Add lines 1 through 5 .................................................................................................... ▪ 6
Column A - Federal Column B - Idaho
7. Column A – Total income from federal Form 1041, line 9
Column B – Total income from line 6 ............................................................ ▪ 7
8. Interest and dividends not taxable under Internal Revenue Code ................ ▪ 8 ▪
9. Addition for bonus depreciation. Include a schedule .................................... ▪ 9 ▪
10. Other additions. Include a schedule ............................................................. ▪ 10 ▪
11. Idaho net operating loss. Carryover ▪ Carryback ▪ 11 ▪
12. Income exempt from Idaho tax. Include a schedule ..................................... ▪ 12 ▪
13. Subtraction for bonus depreciation. Include a schedule ............................... ▪ 13 ▪
14. Other subtractions. Include a schedule ........................................................ ▪ 14 ▪
15. Add lines 7 through 10 and subtract lines 11 through 14 ............................. ▪ 15 ▪
16. Deductions from federal Form 1041, lines 10 through 15a. See instructions .................................... ▪ 16
17. Idaho percentage. Divide line 15, Column B by line 15, Column A ..................................................... ▪ 17 %
18. Multiply line 16 by line 17 ....................................................................................................................▪ 18
19. Idaho adjusted income. Subtract line 18 from line 15, Column B. Enter here and on page 1, line 4 .. ▪ 19
Schedule B - Credits
1. Did you claim the qualified investment exemption for investment tax credit property acquired this tax year? ..... Yes ▪ No
2. Credit for income tax paid to other states - Nonresidents can’t claim this credit.
a. Idaho income tax, page 1, line 11 ............................................................. 2a
Include a copy
b. Total income from federal Form 1041, line 9 ............................................. 2b of the income
c. Enter the portion of line b derived from sources in and taxed tax return and a
by the other state ...................................................................................... ▪ 2c separate Form 66,
d. Divide line c by line b. Enter percentage here .......................................... 2d % page 2 for each
2e state for which a
e. Multiply line a by line d ..............................................................................
credit is claimed.
f. Other state’s tax due less its income tax credits ....................................... ▪ 2f
g. Credit for income tax paid to other states. Enter the smaller of line e or line f.
A copy of the other state’s return must accompany this return ...................................................... ▪ 2g
3. Credit for contributions to Idaho educational entities ........................................................................... ▪ 3
4. Credit for contributions to Idaho youth and rehabilitation facilities ....................................................... ▪ 4
5. Total business income tax credits from Form 44, Part I, line 10. Include Form 44 .............................. 5
6. Total credits. Add lines 2g through 5. Enter total here and on page 1, line 13 ..................................... 6
Within 180 days of receiving this return, the Idaho State Tax Commission may discuss this return with the paid preparer identified below.
▪ Under penalties of perjury, I declare that to the best of my knowledge and belief this return is true, correct, and complete. See instructions.
Signature of fiduciary Paid preparer’s signature Preparer’s EIN, SSN, or PTIN
Sign ▪ ▪ ▪
Here Date Phone number Address Phone number

Return and payment - Mail to: Idaho State Tax Commission, PO Box 83784 Boise ID 83707-3784
Return only - Mail to: Idaho State Tax Commission, PO Box 56, Boise, ID 83756-0056
Include a complete copy of your federal Form 1041.
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                     Form 66 — Instructions                                                                2023
                     Fiduciary Income Tax Return

Instructions are for lines not fully explained on the form. Qualified Funeral Trusts (QFT)
The trust or estate must provide each beneficiary           Check the box if the trustee made the election under 
with an Idaho Form ID K-1. This form shows the              Internal Revenue Code (IRC) Section 685 and the 
beneficiary’s share of Idaho additions, subtractions,       trust otherwise qualifies as a QFT. Check the box if 
and credit information. Form ID K-1 also identifies the     filing a QFT composite return. Don’t complete lines 4 
beneficiary’s share of gross income to help determine       through 16. Enter zero on line 17 and continue to 
Idaho filing requirements of individual beneficiaries.      line 22.

Include all Form ID K-1s and a complete copy of             Qualified Disability Trusts (QDT)
federal Form 1041, including all federal Schedule           Check the box if the entity is a qualified disability trust.
K-1s, with the Idaho Form 66.
                                                            Questions 1, 2, and 3
If filing an ESBT return, include a complete copy of the 
                                                            Mark the appropriate boxes and provide the requested 
federal Form 1041 ESBT tax calculation worksheet 
                                                            information. Answer each question or the return is 
including all appropriate schedules and the Idaho 
                                                            considered incomplete. Incomplete returns delay 
ESBT tax calculation worksheet.
                                                            processing. 
Rounding                                                    Complete questions 1a through 1d if the fiduciary files 
Round the amounts on the return to the nearest whole        Form 66 for an estate. Otherwise, go to question 2.
dollar. Round down if under 50 cents, round up if 50 
                                                            Question 1 Estates. 
cents or more.                                              a. Enter the decedent’s Social Security number.
                                                            b. Enter the decedent’s date of death.
Heading
                                                            c.  If the decedent was an Idaho resident on the date of 
File the 2023 return for calendar year 2023 or a fiscal 
                                                               death, check the “Yes” box.
year that begins in 2023. For a fiscal year, fill in the 
fiscal year beginning and ending dates at the top of        d. If box c is checked “No,” enter the decedent’s state 
the form.                                                      of residence on the date of death.

Write your trust or estate name, fiduciary name and         Question 2 Resident/Nonresident Beneficiaries. 
title, address, and federal Employer Identification         Check the “Yes” box if any beneficiary of the trust or 
Number (EIN) in the space provided. Don’t include the       estate isn’t an Idaho resident. A beneficiary is an Idaho 
dash.                                                       resident if the individual:
                                                            •  Is domiciled for the entire year in Idaho even though 
Amended Returns                                                temporarily outside of Idaho, and
You can use this form as an original return or an           •  Has a home in Idaho for the entire year and spends 
amended return.                                                more than 270 days in Idaho during the tax year
If you’re filing this form as an amended return, check      A Form PTE-12 is required if you checked “Yes.” See 
the amended return box at the top of the form. Enter        Form PTE-12 instructions.
the number from the following list that best describes 
your reason for amending.                                   Question 3 Final Return. Check the “Yes” box if this is 
1.  Federal Audit                                           the final Idaho return for the trust or estate.

2. Net Operating Loss Carryback – Include Form 56           Line 5 Income Distribution Deduction
   or a schedule showing the application of the loss        Enter the amount of the deduction for distributions to 
3.  Federal Amended                                         beneficiaries. Include Form PTE-12 with the return if the 
4. Other – Include an explanation                           trust or estate files as a pass-through entity. Enter the 
                                                            total of Idaho distributable income from Form PTE-12 
Complete the entire form using the corrected amounts.       column (b).

Specific Instructions                                       Line 6 Estate Tax Deduction
Electing Small Business Trusts (ESBT)                       Enter the deduction for federal estate tax attributable 
Check the box if the trustee elected for the trust to be    to income in respect of a decedent. If the income in 
an ESBT for federal purposes.                               question has been distributed, only the fiduciary’s 
                                                            proportionate share may be deducted. Refer to federal 

EIN00044  09-13-2023                                                                                       Page 1 of  10

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Form 66 — Instructions 2023 (continued)

Form 1041 instructions. If any or all of the estate tax Line 9 Exemption
is attributed to income that’s exempt from Idaho tax, Enter zero here if the trust or estate distributes all
you must make a special Idaho adjustment to add its income to the beneficiaries, reports the income
back a proportionate share of the deduction. Include a distribution, and pays the tax for the beneficiaries.
schedule showing the computation. Enter zero here if the trust is an exempt trust filing
Line 8 Qualified Business Income Deduction a Form 990-T to report unrelated business taxable
income. The exemption for a qualified disability trust
Resident Trust or Estate
Enter the amount from Form 1041, line 20. (QDT) is the same as the exemption used for federal
purposes.
Part-year Resident or Nonresident Trust or Estate
Enter the amount from line 4 of the following If all income is reported to Idaho, enter the federal
worksheet: exemption from Form 1041, line 21.

Qualified Business Income Deduction Worksheet
Enter the business information in the table below using information from the K-1s and federal Form 8995. Then add the totals for
1. Column (c) and for column ( ).e
(a) (b) (c) (d) (e)
Business name Taxpayer Total qualified business Idaho apportionment Idaho source qualified
identification number income or (loss) factor business income or (loss)
(Multiply Column c by
Column d)

Total: Total:
2. Divide the total of Column (e) by the total of Column (c) for the Idaho percentage of qualified
business income............................................................................................................................... 2
3. Enter the qualified business income deduction claimed on the federal return ................................ 3
4. Multiply line 2 by line 3 to calculate the Idaho qualified business income deduction.
Enter the amount from line 4 on Idaho Form 66, Line 8 .................................................................. 4
If only part of the income is reported to Idaho, enter Line 15 Income Distribution Reportable by
the amount from line 3 of the following computation: Beneficiaries
Determine the amounts from lines 4 and 5 reported by the
1. Federal exemption, Form 1041,
trust or estate on the fiduciary return. If the trust or estate
line 21 ....................................................
files as a pass-through entity and includes nonresident
2. Idaho percentage. Schedule A, beneficiary income in a composite return, this amount
line 17 ..................................................... % should be the total Idaho distributable income for all
3. Exemption. Multiply line 1 by line 2 ....... shareholders on Form PTE-12 with filing code “C”. Don’t
include amounts distributed to a beneficiary who doesn’t
Line 12 Donation to Opportunity Scholarship meet the Idaho individual income tax filing requirement.
Program If the trust or estate pays the tax for one or more
You can make a voluntary donation to the Idaho nonresident individual beneficiaries, determine each
Opportunity Scholarship Program. The amount beneficiary’s share of the total business income tax
designated will either reduce your refund or increase credits allowed from Form 44, Part I, line 10, and enter
your tax due. Your choice to donate can’t be changed; the total of these amounts on the credits line of Form 66,
you can’t get a refund later. line 16. Don’t enter the total credit earned by the trust
Contributions help provide need-based scholarship or estate if the trust or estate isn’t paying the tax for all
funds to Idaho high school graduates who beneficiaries. Include Form 44.
attend approved higher education institutions
in Idaho. For more information about the Idaho Line 16 Tax on Income Distribution
Opportunity Scholarship Program, please visit If the trust or estate pays the tax on a beneficiary’s
www.boardofed.idaho.gov/scholarship/opportunity.asp. income distribution, this income is taxed at the corporate
rate of 5.8%. If a trust or estate files as a pass-through
Line 13 Credits entity and includes nonresident beneficiary income in a
Enter the amount from Form 66, Schedule B, line 6. composite return, this amount is the same as the total
Instructions for Schedule B begin on page 8. on Form PTE-12 column (c). Any credits from the estate

EIN00044 09-13-2023 Page 2 of 10

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Form 66 — Instructions 2023 (continued)

or trust that flow through to the beneficiary can be used Line 20 Sales/Use Tax Due
to offset the tax attributable to that beneficiary. Include If you purchased an item from an out-of-state seller
a schedule showing this computation. (including internet, catalog, radio, and TV purchases)
and the seller didn’t collect sales tax on that purchase,
Line 17 Permanent Building Fund (PBF) Tax you must pay the use tax directly to the Tax Commission.
A trust or estate that meets the Idaho filing Multiply the total amount of these purchases by 6% (.06).
requirement and doesn’t distribute all of its Idaho
adjusted income must pay the $10 PBF tax. For If you computed use tax on Form 75, add it to the use
example, if the trust pays tax on capital gains, the $10 tax on other purchases and enter the total here.
PBF tax is required. If you have an Idaho sales or use tax account, don’t enter
If a trust or estate reports income on line 14 and your sales or use tax on this line, but continue to report
pays the tax on income paid to nonresident individual the tax on these purchases on your sales and use tax
beneficiaries, it’s required to pay the $10 PBF tax returns.
for each beneficiary. A trust or estate must pay the
Line 21 Tax From Recapture of Qualified Investment
PBF tax for each nonresident individual beneficiary
Exemption (QIE)
included in the composite return.
If you’ve claimed the QIE for property tax on property
If all the Idaho adjusted income is distributed to that no longer qualifies before the end of the five-year
beneficiaries who file Idaho income tax returns, the recapture period, you must recapture part or all of the
trust or estate doesn’t owe this tax. property tax benefit. Enter the amount from Form 49ER,
Enter zero if this is a QFT. Part III, line 18. Include Form 49ER.

Line 18 Total Tax From Recapture of Income Tax Line 22 Tax on ESBT or QFT Composite Return
Credits Don’t include ESBT and QFT items on Schedule A.
If the trust or estate pays the tax for one or more ESBTs: If the trust is an ESBT, the portion that consists
beneficiaries, include on this line those beneficiaries’ of stock in one or more S corporations is treated as a
share of the total tax from recapture of income tax separate trust, and you must compute the tax separately
credits from Form 44, Part II, line 6. Include Form 44. on that separate trust.
Line 19 Fuels Tax Due Use the ESBT Tax Worksheet below to figure the Idaho
If you buy gasoline, aircraft fuel, or special fuels ESBT tax.
(diesel, propane, or natural gas) without paying the
Don’t claim an income distribution deduction, an
fuels tax and later use this fuel in licensed vehicles
exemption amount, or a deduction for capital losses in
or aircraft, you owe fuels tax. Add the amounts on
excess of capital gains.
Form 75, Section IV, lines 3 and 4, and enter the total
here. Include Form 75.

Electing Small Business Trust (ESBT) Tax Worksheet
Idaho Amounts
1. Interest and dividend income. Interest Dividends Enter total ......... 1
2. Income or (loss). Business Farm Enter total ........................... 2
3. Gain or (loss). Capital Ordinary Enter total ................................... 3
4. Rents, royalties, partnerships, other estates and trusts, etc. ........................................................................ 4
5. Other income. Include explanation ................................................................................................................ 5
6. Total income. Add lines 1 through 5 ......................................................................................................... 6
Column A - Federal Column B - Idaho
7. Column A – Total income from federal Form 1041, line 9
Column B – Total income from line 6 ....................................................................... 7
8. Interest and dividends not taxable under Internal Revenue Code .......................... 8
9. Bonus depreciation addition. Include a schedule .................................................... 9
10. Other additions. Include a schedule ........................................................................ 10
11. Idaho net operating loss. Carryover Carryback ....... 11
12. Income exempt from Idaho tax. Include a schedule ................................................ 12
13. Bonus depreciation subtraction. Include a schedule ............................................... 13
14. Other subtractions. Include a schedule ................................................................... 14
15. Qualified business income deduction. See instructions .......................................... 15
EIN00044 09-13-2023 Page 3 of 10

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Form 66 — Instructions 2023 (continued)
Column A - Federal Column B - Idaho
16. Add lines 7 through 10, and subtract lines 11 through 15 ....................................... 16
17. Idaho percentage. Divide line 16, Column B by line 16, Column A .......................................................... 17 %
Deductions
18. Interest .................................................................................................................... 18
19. Fiduciary fees .......................................................................................................... 19
20. Charitable contribution deduction ............................................................................ 20
21. Attorney, accountant, return preparation fees ......................................................... 21
22. Other deductions not subject to 2% limit ................................................................. 22
23. Total deductions. Add lines 18 through 22 ................................................................................................ 23
24. Multiply line 17 by line 23 .......................................................................................................................... 24
25. Idaho taxable income. Subtract line 24 from line 16, Column B ............................................................... 25
26. Idaho ESBT tax. Multiply line 25 by 5.8% ................................................................................................. 26
27. Credit for income tax paid to other states ................................................................................................. 27
28. Credit for contributions to Idaho educational entities ................................................................................ 28
29. Credit for contributions to Idaho youth and rehabilitation facilities ............................................................ 29
30. Total business income tax credits from Form 44, Part I, line 10. Include Form 44 .................................... 30
31. Total tax from recapture of income tax credits from Form 44, Part II, line 6. Include Form 44 .................. 31
32. Tax on Electing Small Business Trust. Add lines 26 and 31, then subtract from lines 27
through 30. Enter total here and on Form 66, page 1, line 22 .................................................................. 32

Worksheet Line 15 Qualified Business Part-year Resident or Nonresident ESBT
Income Deduction Enter the amount from line 4 of the following
Resident ESBT worksheet:
Enter the amount from Federal ESBT Schedule.

Worksheet
Enter the business information in the table below using information from the K-1s and federal Form 8995. Then add the totals for
1. Column (c) and for column ( ).e
(a) (b) (c) (d) (e)
Business name Taxpayer Total qualified business Idaho apportionment Idaho source qualified
identification number income or (loss) factor business income or (loss)
(Multiply Column c by
Column d)

Worksheet Line 28 Credit for Contributions to The credit is limited to the smallest of:
Idaho Educational Entities — If the trust donated • One-half of the amount donated
cash to a qualified educational entity, the trust can • 50% of the tax on ESBT worksheet, line 26
claim a tax credit. Donation of goods or services don’t • $500
qualify.
• The tax on ESBT worksheet, line 26 less the
Include amounts from Form ID K-1, Part VIII, line 50 to amount from the ESBT worksheet, line 27.
calculate the credit amount.

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Form 66 — Instructions 2023 (continued)

If you have credit from an ABE (Form ID K-1, Part XI, refund amounts from the prior year that are rolled
line 59) you can add that to the amount computed forward to the taxpayer’s current year account rather
above (if any). The total credit is limited to the smallest than being refunded to the taxpayer.
of:
Line 25 Idaho Income Tax Withheld
• 50% of the tax on ESBT worksheet, line 26 or Enter the amount of Idaho income tax withheld and
• $500 not repaid by an employer on wages and salaries of
a decedent’s estate. Include state copies of W-2s or
Worksheet Line 29 Credit for contributions to
Idaho youth and rehabilitation facilities — If the 1099s.
trust donated cash or goods to a qualified Idaho youth
Line 26 Tax Paid by Affected Business Entity
and rehabilitation facility, the trust can claim a tax Enter the amount of tax paid by the affected business
credit. entity on the trust’s share and/or the ESBT’s share of
Include amounts from Form ID K-1, Part VIII, line 51 the affected business entity income.
to calculate the credit amount. For trusts and estates that distribute their income to
The credit is limited to the smallest of: their beneficiaries, the credit for tax paid by the ABE
• One-half of the amount donated should be apportioned between the trust or estate and
the beneficiaries in the same proportion as the income
• 20% of the tax computed on the ESBT worksheet,
is allocated to and reported by the trust or estate and
line 26
the beneficiaries.
• $100, or
If the trust is a grantor trust, the ABE information
• The tax on ESBT worksheet, line 26 less the should be included in the grantor letter along with the
amount from the ESBT worksheet, line 27. income information. The beneficiaries will report their
If you have credit from an ABE (Form ID K-1, Part XI, share of the payment on their individual tax return.
line 61) you can add that to the amount computed
above (if any). The total credit is limited to the smallest Line 27 Special Fuels and Gasoline Tax Refund
of: The special fuels (diesel, propane, or natural gas)
tax refund is available to those who use the fuel for
• 20% of the tax computed on the ESBT worksheet, heating or in off-highway equipment and have paid the
line 26 or tax on the special fuels purchased. Enter the amount
• $100 from Form 75, Section IV, line 2. Include Form 75.
QFTS: If the trust files a composite QFT return, use the The gasoline tax refund is available to those who buy
same information and schedules for Idaho as you use to and use gasoline in off-highway equipment or auxiliary
determine tax on federal Form 1041-QFT. Calculate each engines. Enter the amount from Form 75, Section IV,
QFT’s Idaho taxable income and liability on a separate line 1. Include Form 75.
schedule, and include it with the composite Idaho return.
Line 28 Tax Reimbursement Incentive Credit
To arrive at the QFT’s Idaho taxable income, each QFT Enter the total credit allowed from the Idaho
included in the Idaho composite return should start Reimbursement Incentive certificate. Include a copy of
with its federal taxable income as reported in the detail the certificate with the return.
information attached to the federal Form 1041-QFT
composite return. Each QFT’s federal taxable income is Line 31 Penalty and Interest
then subject to the Idaho modifications listed on Form 66, Idaho law provides penalties for not filing tax
Penalty:
Schedule A. returns by the due date, not paying tax due on time,
A QFT isn’t entitled to claim the exemption deduction in and not prepaying enough on extension returns. For
computing Idaho taxable income. more information or to calculate a penalty, see our
Report the total of the Idaho income tax due for all of the Penalties and Interest page at tax.idaho.gov/penalties.

QFTs on line 22. Interest is charged from the due date until
Interest:
Line 24 Estimated Tax Payments paid. The rate for 2024 is 6%.
Enter the total amount of payments made and the
amount applied from your 2022 return. If payment is
made under other EINs, provide a schedule with the
EINs, amounts, and rollforwards. Rollforwards are

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                                                              Form 66 — Instructions     2023  (continued)         

Line 32 Nonrefundable Credit From a Prior Year              For any part of the year you’re a nonresident trust or 
Return                                                      estate, include any capital or ordinary gain or loss 
If you were denied a refund from an overpayment of          from Idaho sources received in 2023.
tax on a prior year return because of the three-year 
                                                            Line 4 Rents, Royalties, Partnerships, Other 
statute of limitations, you may be eligible to take 
                                                            Estates and Trust
a credit for the amount. See Idaho Form 44 for 
                                                            If you’re a resident or part-year resident trust or estate, 
calculation of your credit and include it with your         include any rents, royalties, partnership or other estate 
return.                                                     and trust income received in 2023 while an Idaho 
                                                            resident.
Line 35 Refund/Apply to 2024
                                                            For any part of the year you’re a nonresident trust 
Refund                                                      or estate, include any rents, royalties, partnership or 
Enter the amount of your overpayment from line 34           other estate and trust from Idaho sources received in 
that you want refunded to you. Refunds of less than         2023.
$1 won’t be issued. You have three years from the 
return’s due date (not including extensions) to claim       Line 5 Other Income
a refund. Refunds will be reduced by unpaid Idaho           If you’re a resident or part-year resident trust or estate, 
                                                            include any other income received in 2023 while an 
tax liabilities and can be applied to unpaid liabilities 
                                                            Idaho resident.
owed to other agencies.
                                                            For any part of the year you’re a nonresident trust or 
The agency or party seizing the refund must send 
                                                            estate, include any other income from Idaho sources 
you notice of the action. Questions about a refund 
                                                            received in 2023.
seizure should be directed to the agency or party 
that initiated the claim for seizure.                       Include a schedule detailing the sources and amounts 
                                                            of other income.
Apply to 2024
If you’re filing an original return, subtract the           Line 8 Interest and Dividends not Taxable Under 
amount you want to refund from line 34. Any                 Internal Revenue Code (IRC)
difference will be applied to your 2024 tax and             Column A Enter the interest and dividends net of 
won’t be refunded.                                          applicable amortization received or accrued from 
                                                            obligations of any state or political subdivision 
Schedule A                                                  excluded from federal taxable income under the 
                                                            provisions of the IRC. If you’re a partner in a 
All trusts and estates must complete Schedule A.            partnership that has Idaho source income, include 
                                                            your distributive share from Form ID K-1, Part IV, 
Line 1 Interest and Dividend Income
                                                            Column A, line 21. This amount can’t be less than 
If you’re a resident or part-year resident trust or estate, 
                                                            zero.
include any taxable interest and dividend income 
received in 2023 while an Idaho resident.                   Column B Enter the interest and dividends net of 
                                                            applicable amortization received or accrued from 
For any part of the year you’re a nonresident trust or 
                                                            obligations of any state or political subdivision 
estate, include any taxable interest and dividend income 
                                                            excluded from federal taxable income under the 
from Idaho sources received in 2023.
                                                            provisions of the IRC received while a resident of 
Line 2 Income or (Loss)                                     Idaho or from Idaho sources. Include on this line 
If you’re a resident or part-year resident trust or estate, your apportioned share from Form ID K-1, Part IV, 
include any business or farm income or loss received in     Column B, line 21. This amount can’t be less than 
2023 while an Idaho resident.                               zero.

For any part of the year you’re a nonresident trust or      Line 9 Addition for Bonus Depreciation
estate, include any business or farm income or loss from    If you claimed federal bonus depreciation for property 
Idaho sources received in 2023.                             placed in service before 2008 or after 2009:
                                                            •    Complete a separate federal Form 4562 or 
Line 3 Gain or (Loss)                                            detailed computation for Idaho depreciation 
If you’re a resident or part-year resident trust or estate,      purposes as if the special depreciation allowance 
include any capital or ordinary gain or loss received in         hadn’t been claimed
2023 while an Idaho resident.

EIN00044 09-13-2023                                                                                           Page 6 of 10

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Form 66 — Instructions 2023 (continued)

• Compute the Idaho adjusted basis and any gains Line 12 Income Exempt From Idaho Tax
or losses from the sale or exchange of property Column A Enter the amount of interest income received
using the Idaho depreciation amounts from U.S. government obligations (U.S. Savings Bonds,
• If the federal depreciation (including gains and etc.) and Idaho municipal securities not distributed.
losses) is more than the Idaho depreciation Expenses related to the production of this income reduce
(including gains and losses), include the difference the amount you enter here. This amount is adjusted
as a deduction on this line; otherwise, enter the to reflect the estate tax deduction on page 1, line 6,
difference on Column A, line 13. attributed to income exempt from Idaho tax.
Don’t enter any amounts for property acquired during The fiduciary must provide the beneficiary with the
2008 and 2009 necessary information if a portion of this adjustment
was distributed. Include a schedule showing your
Column A If the federal depreciation is more than computations. If you’re a partner in a partnership that
the depreciation calculated without the bonus has Idaho source income, include your distributive
depreciation, include the difference on this line. If share from Form ID K-1, Part IV, Column A, lines 24
you’re a partner in a partnership that has Idaho source and 25.
income, include your distributive share from Form ID
K-1, Part IV, Column A, line 22. Column B Enter the portion of income exempt
from Idaho tax, from Column A, while you were an
Column B If the federal depreciation is more than the Idaho resident. Include your distributive share from
depreciation calculated without the bonus depreciation, Form ID K-1, Part IV, Column B, lines 24 and 25.
include the difference on this line for the time you were
an Idaho resident or from Idaho sources. Include on this Line 13 Subtraction for Bonus Depreciation
line your apportioned share from Form ID K-1, Part IV, If you claimed federal bonus depreciation for property
Column B, line 22. placed in service before 2008 or after 2009:
• Complete a separate federal Form 4562 or
Line 10 Other Additions
Column A Enter any miscellaneous Idaho additions. detailed computation for Idaho depreciation
Include a schedule identifying each addition. Include purposes as if the special depreciation
unrelated business taxable income on this line. If you’re allowance hadn’t been claimed
a partner in a partnership that has Idaho source income, • Compute the Idaho adjusted basis and any
include your distributive share from Form ID K-1, Part IV, gains or losses from the sale or exchange of
Column A, line 23. property using the Idaho depreciation amounts
Column B Enter the portion of miscellaneous Idaho • If the federal depreciation (including gains and
deductions, from Column A, while you were an losses) is less than the Idaho depreciation
Idaho resident. Include your distributive share from (including gains and losses), include the
Form ID K-1, Part IV, Column B, line 23. difference as a deduction on this line; otherwise,
enter the difference on Column A, line 9
Line 11 Idaho Net Operating Loss (NOL) Carryover Don’t enter any amounts for property acquired during
and Carryback 2008 and 2009.
Columns A and B Enter the Idaho NOL carryover.
Include Form 56 or a schedule showing the application of Column A If the federal depreciation is less than
the loss. Don’t include losses from sources that weren’t the depreciation calculated without the bonus
taxable by Idaho or that were incurred before becoming a depreciation, include the difference on this line. If
resident or part-year resident. you’re a partner in a partnership that has Idaho source
income, include your distributive share from Form ID
If this is an amended return to claim an NOL carryback, K-1, Part IV, Column A, line 27.
enter the amount of the NOL carryback. Include Form 56
or a schedule showing the application of the loss. Column B If the federal depreciation is less than the
depreciation calculated without the bonus depreciation,
Enter the total of the NOL carryover and carryback include the difference on this line for the time you were
amounts. an Idaho resident or from Idaho sources. Include on
this line your apportioned share from Form ID K-1,
Part IV, Column B, line 27.

EIN00044 09-13-2023 Page 7 of 10

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Form 66 — Instructions 2023 (continued)

Line 14 Other Subtractions To claim a credit you acquired through a transfer, include
Column A Enter any miscellaneous Idaho deductions. a copy of Form 70, Idaho Statement of Credit Transfer,
Include a schedule identifying each subtraction. with each return you’re claiming transferred credit on.
If you’re a partner in a partnership that has Idaho
source income, include your distributive share from Line 1 Property Tax Exemption
Form ID K-1, Part IV, Column A, lines 26 and 28. Check the “Yes” box if you elected the property tax
exemption on personal property that qualifies for the
Column B Enter the portion of miscellaneous Idaho investment tax credit. Include a copy of Form 49E.
deductions, from Column A, while you were an
Idaho resident. Include your distributive share from Line 2 Credit for Taxes Paid to Another State
Form ID K-1, Part IV, Column B, lines 26 and 28. This credit only applies to resident or part-year resident
trusts or estates.
Line 16 Deductions From Federal Form 1041
Don’t include state income taxes deducted on An Idaho trust or estate must report all of its income
Form 1041, line 11. regardless of where it was earned. If the trust or estate
also is taxed by another state on income reported on
Schedule B the Idaho return, it can claim a credit against the Idaho
tax. The credit is limited to the proportion of the Idaho
Compute tax credits according to the following
tax that the federal total income of the trust or estate
instructions and the instructions accompanying the
derived from sources in the other state and taxed by
appropriate forms. Credits pass through to beneficiaries
that state bears to the federal total income.
the same way income and expenses are distributed.
If you have credit for taxes paid to more than one
The fiduciary must provide each beneficiary with an
state, use a separate Schedule B for each state. You
Idaho Form ID K-1. This form shows the beneficiary’s
must include a copy of the other state’s tax return with
share of credits earned, credits subject to recapture,
your Idaho return. Enter the total on line 2g. Amounts
and contribution information needed to calculate
on line 2d should be rounded to four digits to the right
certain credits. Each beneficiary uses this information
of the decimal point. For example, .66666 is rounded
to determine the amount of Idaho credit allowed,
to .6667 and should be entered as 66.67%.
recapture required, and credit carryovers that exist
on the beneficiary’s Idaho income tax return. Credits If the trust is an ESBT, complete a separate
reported by each beneficiary are subject to the Schedule B for the S corporation items. Modify the
limitations applicable to that beneficiary. Include copies Schedule B to report the applicable S corporation
of Form ID K-1 with your return for the year when the amounts from the ESBT tax computation schedules.
credit is earned.
Line 3 Credit for Contributions to Idaho Educational
If an individual beneficiary’s share of income is taxed on Entities
the trust or estate return, the tax can be offset by that Cash donations made by a trust or estate to a
beneficiary’s share of credits. Credits applied to this tax qualified educational entity can qualify for a tax credit.
are computed based on the credit limitations applicable Donations of goods or services don’t qualify.
to trusts or estates. For example, if a partnership pays
Include amounts from Form ID K-1, Part VII, line 50 to
the tax for three individual beneficiaries, the amount of
calculate the credit amount.
credit for contributions to educational institutions is the
lesser of the following amounts: If the trust or estate pays the tax for one or more
beneficiaries, the credit is limited to the smallest of:
• 50% of the three beneficiaries’ share of the amount
donated • The beneficiary’s share of one-half of the amount
donated
• 50% of the tax computed for the three beneficiaries, or
• 50% of the tax computed for the beneficiary
• $500
• $500, or
Credits allowed to a beneficiary that aren’t used to
offset that beneficiary’s tax can’t be used to offset the • The beneficiary’s tax, minus the amount on
tax computed for other beneficiaries. The broadband Schedule B, line 2g attributable to that beneficiary
equipment investment credit can be transferred to
another taxpayer rather than used by the taxpayer who
earns the credit.

EIN00044 09-13-2023 Page 8 of 10

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                                                                Form 66 — Instructions     2023  (continued)         

If you have credit from an ABE (Form ID K-1, Part XI,         If the trust or estate pays the tax for one or more 
line 59), you can add that to the amount computed             beneficiaries, the credit is limited to the smallest of:
above (if any). The total credit is limited to the smallest   • The beneficiary’s share of one-half of the amount 
of:                                                             donated
•   50% of the tax computed for the beneficiary or            • 20% of the tax computed for the beneficiary
•   $500.                                                     • $100, or
Don’t enter the total credit earned by the trust or           • The beneficiary’s tax less the amounts attributable 
estate if the trust or estate isn’t paying the tax for all      to that beneficiary on lines 2g and 3 and Form 44, 
the beneficiaries.                                              Part I, line 1
A qualified educational entity includes:                      If you have credit from an ABE (Form ID K-1, Part XI, line 
•   A nonprofit corporation, fund, foundation,                61), you can add that to the amount computed above (if 
    research park, trust, or association organized            any). The total credit is limited to the smallest of: 
    and operated exclusively for the benefit of Idaho         • 20% of the tax computed for the beneficiary or 
    colleges and universities                                 • $100
•   A nonprofit, private, or public Idaho school 
                                                              Don’t enter the total credit earned by the trust or estate 
    (elementary, secondary, or higher education) or 
                                                              if the trust or estate isn’t paying the tax for all the 
    its foundation
                                                              beneficiaries.
•  Idaho education public broadcast system 
    foundations                                               The qualified youth or rehabilitation facilities and their 
                                                              foundations are:
•   The Idaho State Historical Society or its 
    foundation                                                •  Anchor House
•  An Idaho public library or its foundation                  • The Arc, Inc., Boise
•  An Idaho library district or its foundation                • The Children’s Home Society of Idaho, Inc., Boise
•   An Idaho public or private nonprofit museum               • The Children’s Village, Inc., Coeur d’Alene
•  The Idaho Commission for Libraries                         • Dawn Enterprises, Inc., Blackfoot
•   Idaho Commission on Hispanic Affairs                      • Development Workshop, Inc., Idaho Falls
•   Idaho Commission for the Blind and Visually               • Gem Youth Services, Emmett
    Impaired                                                  • Hope House, Inc., Nampa
•  Idaho Council on Developmental Disabilities                • Idaho Drug Free Youth, Inc., Coeur d’Alene
•   Idaho State Independent Living Council                    • Idaho Elks Rehabilitation Hospital, Inc., Boise
•   Idaho STEM Action Center                                  •  Idaho Youth Ranch
•  Idaho Council for the Deaf and Hard of Hearing             • Kinderhaven, Sandpoint
•  Medical residency programs or support                      • Learning Lab, Inc., Boise
    organizations devoted to training residents in            • Magic Valley Rehabilitation Services, Inc.,Twin Falls
    Idaho                                                     • New Day Products, Inc., Pocatello
Line 4 Credit for Contributions to Idaho Youth and            • Northwest (North Idaho) Children’s Home
Rehabilitation Facilities                                     • Opportunities Unlimited, Inc., Lewiston
A trust or estate can claim this credit if it donated cash or • Panhandle Special Needs, Inc., Sandpoint
goods to the following:                                       • Project P.A.T.C.H. (Planned Assistance for Troubled 
•   Qualified center for independent living                     Children)
•   Youth or rehabilitation facility or its foundation, or    • Shepherd’s Home, Inc., McCall
•   Nonprofit substance abuse center licensed by the          • Transitional Employment Services for the 
    Idaho Department of Health and Welfare                      Handicapped, Coeur d’Alene
Include amounts from Form ID K-1, Part VII, line 51 to        • Walker Center, Gooding
calculate the credit amount.                                  • Winchester Occupational Workshop, Winchester
                                                              • Witco Inc., Caldwell
                                                              • Women’s and Children’s Alliance

EIN00044 09-13-2023                                                                                        Page 9 of 10

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                                                                                      Form 66 — Instructions     2023  (continued)         

The following are the qualified centers for independent                             You’re also authorizing the paid preparer to:
living:                                                                             • Give the Tax Commission any information that’s 
• Disability Action Center Northwest, Moscow and                                      missing from your return, and
  Coeur d’Alene                                                                     •  Call the Tax Commission for information about 
• Living Independence Network Corporation, Boise                                      the processing of your return or the status of your 
  and Twin Falls                                                                      refund or payments
• Living Independently For Everyone, Inc., Blackfoot,                               You aren’t authorizing the paid preparer to receive 
  Idaho Falls, and Pocatello                                                        any refund check, bind you to anything including any 
                                                                                    additional tax liability, or otherwise represent you before 
Line 5 Total Business Income Tax Credits                                            the Tax Commission.
Enter the total business income tax credits from 
Form 44, Part I, line 10. Include Form 44.                                          This authorization is valid for up to 180 days from the 
                                                                                    date the Tax Commission receives the return. If you 
Signature                                                                           want the Tax Commission to contact you instead of your 
                                                                                    preparer, leave the box blank.
The fiduciary or an officer representing the fiduciary must 
sign the return.

Tax Preparer
Check this box if you paid a tax preparer to complete 
your return, and you’re authorizing the Tax Commission 
to discuss your return with the paid preparer identified on 
your return.

Idaho Fiduciary Tax Computation Schedule

If Idaho taxable income is:                                                        The tax is:

Less than or equal to $4,489 ..............................................        0
$4,489 or more ................................................................... 5.8% of excess over $4,489

                                                 Contact us:
                    In the Boise area: (208) 334-7660  |                            Toll free: (800) 972-7660
                             Hearing impaired (TDD) (800) 377-3529
                                           tax.idaho.gov/contact
EIN00044 09-13-2023                                                                                                              Page 10 of 10

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