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Form 41ESR 2023
Underpayment of Estimated Tax
Include with Form 41 or Form 41S
Business name Federal Employer Identification Number (EIN)

Part I — Underpayment Computation
1. Enter the 2023 total tax .................................................................................................................... 1
2. Enter the total of the fuels tax, sales/use tax, tax from recapture of the QIE, and the tax
reimbursement incentive credit from the 2023 corporate return ...................................................... 2
3. Subtract line 2 from line 1. If the result is less than $500, don’t complete this form ........................ 3
4. Multiply line 3 by 90% ...................................................................................................................... 4
5. Enter the total tax less the total of the fuels tax, sales/use tax, tax from recapture of the
QIE, and the tax reimbursement incentive credit from the 2022 tax return ..................................... 5
6. Estimated tax. Enter the smaller of line 4 or line 5 .......................................................................... 6
Installments
A B C D
7. Enter the installment due dates that correspond
to the 15th day of the 4th, 6th, 9th, and 12th
months of the tax year ................................................
8. Enter 25% of line 6 in each column. (If income is
annualized, use amounts from line 33) .......................
9. Amount paid or credited for each period .....................
10. Enter the amount from line 14 of the preceding
column .........................................................................
11. Amount applied to previous installment .......................
12. Add lines 9 and 10, then subtract line 11 ....................
13. Underpayment. If line 12 is less than or
equal to line 8, subtract line 12 from line 8 ..................
14. Overpayment. If line 8 is less than line 12,
subtract line 8 from line 12 ..........................................
Part II — Underpayment Interest Computation
15. Enter date of payment or the 15th day of the 4th
month after end of tax year, whichever is earlier .........
16. Number of days from due date of installment
on line 7 to the date shown on line 15 ...............................
17. Number of days on line 16 before 1/1/2024 ................
18. Number of days on line 16 after 12/31/2023 ...............
19. Number of days on line 17 X 5% (.05) .......................
365
20. Number of days on line 18 X 6% (.06) ......................
366
21. Multiply line 19 by the underpayment on line 13 .........
22. Multiply line 20 by the underpayment on line 13 .........
23. Add lines 21 and 22 ....................................................
24. Add line 23 columns A through D. Enter here
and on Form 41, line 50 or Form 41S, line 57 .............
Part III — Annualized Income Installment Method
1 2 3 4
25. Enter Idaho annualized taxable income ......................
26. Multiply line 25 by 5.8% ...............................................
27. Enter other taxes for each payment period .................
28. Enter tax credits for each period ..................................
29. Total tax. Add lines 26 and 27, then subtract line 28 ...
30. Applicable percentage ................................................. 22.5% 45% 67.5% 90%
31. Multiply line 29 by line 30 ............................................
32. Annualized periodic estimates. (See instructions) .......
33. Subtract line 32 from line 31. Enter on Part I, line 8 ....
EFO00027 08-31-2023

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Form 41ESR — Instructions
Underpayment of Estimated Tax 2023

A corporation must make estimated tax payments Line 6. Enter the smaller of lines 4 or 5. If you used
to the Tax Commission if it’s required to make annualized income to determine your estimated
estimated tax payments to the Internal Revenue tax payments, use Part III to show the annualized
Service and owes Idaho income tax of $500 or computation.
more. Estimated tax payments aren’t required if
the corporation wasn’t required to file an Idaho Line 7. Enter the installment dates for your
return the previous tax year. Estimated payments estimated tax payments. The installment due dates
aren’t required on tax due on income you report for for Idaho’s estimated tax payments are the same
individual owners. due dates required for your federal estimated tax
payments.
Each estimated tax payment must be 25% of the
lesser of: Line 8. Multiply the amount on line 6 by 25%. This is
• 100% of the corporation’s income tax for 2022, or the required installment for each quarter. If income is
annualized, enter the amounts from line 33.
• 90% of its income tax for 2023
Line 9. Complete lines 9 through 14 for one column
Use Form 41ESR to determine whether the
before completing the next column.
corporation underpaid its estimated tax and to
compute the interest on any underpaid amount. Column A Include the amount credited to 2023
estimated tax from your 2022 return
Multiple Payments and estimated tax payments made by
You may need to use additional copies of this form the 15th day of the 4th month of the
if you make multiple payments, and they’re applied tax year
to the underpayment of a prior period.
Column B Enter payments made after the 15th
Part I — Underpayment Computation day of the 4th month through the 15th
Complete Part I to determine if you have an day of the 6th month of the tax year
underpayment for any of the payment periods.
Column C Enter payments made after the 15th
Line 1. Enter the total tax amount reported on the day of the 6th month through the 15th
2023 return. For Form 41, this is the amount on line day of the 9th month of the tax year
49. For Form 41S, this is the amount on line 56.
Column D Enter payments made after the 15th
Line 2. Enter the total of the fuels tax, sales/use day of the 9th month through the 15th
tax, tax from recapture of qualified investment day of the 12th month of the tax year
exemption (QIE) and the tax reimbursement
incentive credit claimed on the corporate return. For Line 10. Enter any overpayment shown on line 14 of
Form 41, this is the total of lines 46 through 48 and the previous column.
line 56. For Form 41S, this is the total of lines 53
Line 11. If you had any underpayment in the previous
through 55 and line 63.
column, enter the amount of this period’s payment that
Line 5. Enter the total tax amount less the total of will be applied to the underpayment. Don’t enter more
the fuels tax, sales/use tax, tax from recapture of than the amount on line 9.
QIE and the tax reimbursement incentive credit
Line 13. If your payments on line 12 are less than the
reported on the 2022 return. For Form 41, this
payments due on line 8, subtract line 12 from line 8
is the amount on line 49 minus the total of lines
and enter your underpayment here. If line 13 shows
46 through 48 and line 56. For Form 41S, this is
an underpayment, complete Part II to compute the
the amount on line 56 minus the total of lines 53
interest.
through 55 and line 63.

EIN00074 08-31-2023 Page 1 of 2

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Form 41ESR — Instructions 2023 (continued)

Line 14. If your payments on line 12 are more than Line 24. Add the amounts shown on line 23,
the payments due on line 8, subtract line 8 from line columns A through D. Enter the total here and on
12 and enter your overpayment. Form 41 or Form 41S.

Part II — Underpayment Interest Computation Part III — Annualized Income
If you computed an underpayment on Part I, line 13, Installment Method
complete lines 15 through 24 to determine the If your estimated tax payments are based on
amount of the interest due on the underpayment. annualized income for federal purposes, you may
use that same method to make Idaho estimated tax
Line 15. Enter the date you made a payment that payments. Use Schedule A, Part II of the federal
was applied to the underpayment amount shown Form 2220 to compute the federal annualized income.
on line 13 or enter the 15th day of the 4th month
following the close of the tax year, whichever is Line 25. For a 100% Idaho corporation, enter its
earlier. federal annualized income adjusted for Idaho additions
and subtractions for each period. For a multistate
Line 16. Enter the number of days from the due corporation, multiplty the federal annualized income
date of the installment shown on line 7 to the date adjusted for Idaho additions and subtractions by the
shown on line 15. apportionment factor, and enter the result.

Line 19. Divide the number of days shown on Line 32.
line 17 by 365. Multiply the result by 5%, the
Column 2 Enter the amount from line 33,
interest rate for 2023. Compute the percentage
column 1
to two places to the right of the decimal point
(00.00%). Column 3 Enter the amount from line 33,

Divide the number of days shown on column 2
Line 20.
line 18 by 366. Multiply the result by 6%, the
Column 4 Enter the amount from line 33,
interest rate for 2024. Compute the percentage
column 3
to two places to the right of the decimal point
(00.00%).
Complete columns B through D, lines 7 through 23.
For a short period return, complete the appropriate
number of columns.

Contact us:
In the Boise area: (208) 334-7660 Toll| free: (800) 972-7660
Hearing impaired (TDD) (800) 377-3529
tax.idaho.gov/contact
EIN00074 08-31-2023 Page 2 of 2

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