Instructions for 2024 Schedule A-03:  Wisconsin Apportionment Percentage for 
                                   Interstate Motor Carriers 
                                                       
Purpose of Schedule A-03 

Interstate motor carriers required to use apportionment must use the factor prescribed in sec. Tax 2.47, Wisconsin 
Administrative Code. 
 
The apportionment percentage is the average of the following two ratios: 
 
1.  Gross receipts from carriage of persons or property first acquired for carriage in Wisconsin to total gross 
  receipts from carriage of persons or property everywhere (line 1).  
2.  Ton miles of carriage in Wisconsin to ton miles of carriage everywhere (line 5). If the above information isn’t 
  available, the Department may authorize or direct the substitution of a similar factor (for example, gross 
  tonnage instead of gross receipts or revenue miles instead of ton miles). 

Line-by-Line Instructions  

Share of Apportionment Factors 

Partnerships, corporations, and tax-option (S) corporations must generally include their share of the numerator 
and  denominator  of  the  partnership’s  apportionment  factors  in  the  numerator  and  denominator  of  their 
apportionment factors. Include these amounts using the Wisconsin apportionment Schedules A-01 through A-11, 
as appropriate. 

■ Line 1. Gross Receipts form Carriage of Persons and Property – For the Wisconsin column, enter the gross 
receipts received from the carriage of persons and property that is first acquired in Wisconsin.   

For the Total Company column, enter the gross receipts from the carriage of persons and property everywhere.   

■ Line 5. Ton Miles of Carriage – For the Wisconsin column, enter the ton miles of carriage in Wisconsin.  A ton 
mile  is  the  movement  of  one  ton  of  persons  or  property,  or  both,  one  mile.    Each  person  is  considered  the 
equivalent of 200 pounds.  

For the Total Company column, enter the ton miles of carriage everywhere.  

■ Line 9. Apportionment Percentage (Separate return filers and pass-through entities) – Add lines 4 and 8. Fill 
all spaces to the right of the decimal point. Round to the nearest ten-thousandth of a percent (for example, 
12.3456%). See the instructions of the tax form you are filing (Form 1NPR, 2, 3, 4, 4T, 5S, or 6) for how to report 
and use this percentage. 

Conversion to Modified Sales Factor (combined return filers only) 
 
Combined return filers complete lines 10 through 19 to compute the “modified sales factor” that will determine 
their Wisconsin share of combined unitary income.   

■ Line 10. Sales Factor Amounts   – Enter the total company sales for each line.  

■ Line 12. Intercompany Sales (Combined Group Members Only) – Any sales made between members of the 
same combined group (“intercompany sales”), either directly or through interests in a pass-through entity, must 
be excluded from the amounts you entered on lines 10a through 10l. 

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                                           2024 Schedule A-03 Instructions 

Report the excluded amount of intercompany sales on line 12. If you already excluded these intercompany sales 
from the amounts you entered on lines 10a through 10l, do not enter any amounts on line 12.  
 
Following are additional details about intercompany transactions that involve pass-through entities. For additional 
information, refer to sec. Tax 2.61(7)(e), Wisconsin Administrative Code. 

Sales to Pass-Through Entities Owned by Combined Group Members. If a combined group member makes 
a sale to a pass-through entity which is more than 50 percent owned, directly or indirectly, by members of the 
combined group, the member must eliminate an amount equal to the gross receipts of the sale multiplied by the 
sum of all combined group members’ interests in the pass-through entity as of the date of the sale. The examples 
below illustrate: 

Example 1: Combined Group LM consists of Member L and Member M. L owns a 40% interest in Partnership P. 
M owns a 60% interest in Partnership P. On March 1, 2024, L sells a widget to Partnership P for $10,000, and this 
sale is includable in Group LM’s combined unitary income. In its computation of apportionment factors for 2024, 
L  must  subtract  an  amount  of  $10,000  (= $10,000  x  (40%  +  60%))  from  its  sales  factor  denominator  and,  if 
applicable, from its numerator. 

Example 2: Assume the same facts as Example 1, except that Member L owns a 25% interest and M owns a 50% 
interest in Partnership P. In its computation of apportionment factors for  2024, L must subtract an amount of 
$7,500 (= $10,000 x (25% + 50%)) from its sales factor denominator and, if applicable, from its numerator. 

Sales by Pass-Through Entities Owned by Combined Group Members. If a pass-through entity makes a sale 
to a combined group member and more than 50 percent of the pass-through entity is directly or indirectly owned 
by members of the combined group, each member with an interest in the pass-through entity must subtract from 
its sales factor numerator and denominator any amount that would otherwise be included attributable to the sale.  

The example below illustrates: 

Example: Combined Group ST consists of Member S and Member T. S owns a 20% interest in Partnership R. T 
owns an 80% interest in Partnership R. On October 1, 2024, Partnership R sells a widget to S for $20,000, and 
this sale is includable in Group ST’s combined unitary income. In its computation of apportionment factors for 
2024, S must subtract an amount of $4,000 (= $20,000 x 20%) from its sales factor denominator and, if applicable, 
from its numerator. Similarly, T must subtract an amount of $16,000 (= $20,000 x 80%)  from its sales factor 
denominator and, if applicable, from its numerator. 

■ Line 13. Sales Excluded from Combined Unitary Income (Combined Group Members Only) – If you reported 
an amount on Form 6, Part II, line 6 for separately apportioned income, you must exclude the sales attributable 
to that amount from the numerator and denominator of the sales factor, as applicable. Report the excluded amount 
of these sales on line 13. However, if you already excluded these sales from the amounts you entered on lines 
10a through 10l, do not enter any amounts on line 13.  

See the instructions to Form N, Wisconsin Nonapportionable, Separately Accounted, and Separately Apportioned 
Income, for further details on how to report and apportion separately apportioned income. 

■ Line 16. Sales Previously Deferred (Combined Group Members Only)   – If a combined group member made 
a sale to another member of the combined group in a prior taxable year and gain or loss on the transaction was 
deferred under the provisions of sec. 71.255(4)(g), Wis. Stats., the selling member must include the gross receipts 
from the sale in its sales factor in the year the gain or loss is recognized, to the extent those gross receipts are 
otherwise includable in the sales factor.  

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                                          2024 Schedule A-03 Instructions 

 NOTE:  Section  71.255(4)(g),  Wis.  Stats.,  provides  that  the  intercompany  deferral  provisions  of  Treas. Reg. 
 §1.1502-13 apply to a combined group similarly to how they apply to a consolidated group for federal purposes.                 
 See the instructions to Form 6, Part I, line 33, for details.  

Report the gross receipts corresponding to any income recognized under sec. 71.255(4)(g), Wis. Stats., on line 16. 
If you already included these receipts in the amounts you entered on lines 10a through 10l, do not enter any 
amounts on line 16.  

Under sec. Tax 2.61(7)(d), Wisconsin Administrative Code, special sourcing rules apply to amounts reported on 
line  16.  If  a  combined  group  member  sells  an  item  or  service  to  another  combined  group  member  and  the 
purchaser subsequently resells it to a third party outside of the group, the situs of both sales is determined based 
on the situs of the sale from the purchasing member to the third party. Also, the purchasing member must exclude 
from its apportionment factors the amount the selling member already included attributable to that same item or 
service. The example below illustrates:  

Example:  

Combined Group YZ consists of Member Y and Member Z. Group YZ is on a calendar year. On December 30, 
2023, Y sells a widget with a cost of $400 to Z, for $600. Y ships the widget to Z’s warehouse in Wisconsin. On 
January  30,  2024,  Z  resells  the  widget  to  Q,  an  unrelated  third  party,  for  $700.  Z  ships  the  widget  to  Q’s 
headquarters in Illinois. Assume both the sale by Y and the sale by Z are includable in combined unitary income, 
and assume that Z has nexus in Illinois.  

In 2023, Y did not recognize any gain on the sale to Z because the gain was deferred under the provisions of sec. 
71.255(4)(g), Wis. Stats. Since the gain on the sale was not recognized, Y cannot include the $600 sale in its 
apportionment factors for 2023.  

In 2024, Y must include its $200 of gain on the sale to Z (= $600 - $400) in combined unitary income. Y must also 
include the sale amount of $600 in its sales factor denominator for 2024. Z must include its $100 gain on the sale 
to Q (= $700 - $600) in combined unitary income for 2024 However, since $600 of Z’s sales price has already 
been included in Y’s sales factor, Z may only include the remaining $100 of the sale amount in its sales factor 
denominator. Neither Y nor Z include these amounts in their sales factor numerators since both sales are deemed 
to have a situs in Illinois where Group YZ has nexus.  

Additional Information and Assistance 
 
Web Resources  
 
The Department of Revenue’s web page, available at revenue.wi.gov, has several resources to provide additional 
information and assistance, including: 
 
• Related forms and their instructions  
• Common questions  
• Publications on specific tax topics 
• The Wisconsin Tax Bulletin  
• A home page specifically for combined reporting topics         
• Links to the Wisconsin Statutes and Administrative Code 

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                               2024 Schedule A-03 Instructions 

Contact Information  
 
If you cannot find the answer to your question in the resources available on the Department of Revenue’s web 
page, contact the Department using any of the following methods: 
 
• E-mail your question to: DORFranchise@wisconsin.gov 
• Call (608) 266-2772  
  (Telephone  help  is  also  available  using  TTY  equipment.  Call  the  Wisconsin  Telecommunications  Relay 
  System at 711 or, if no answer, (800) 947-3529. These numbers are to be used only when calling with TTY 
  equipment.) 
• Send a fax to (608) 267-0834 
• Write to the Audit Bureau, Wisconsin Department of Revenue, Mail Stop 3-107, PO Box 8906, Madison, WI  
  53708-8906 
 
                               Applicable Laws and Rules 
  This document provides statements or interpretations of the following laws and regulations enacted as of October 
  17, 2024: Chapter 71 Wis. Stats., and Chapter Tax 2, Wis. Adm. Code 

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