FormC: Wisconsin Allocation and Separate Accounting Data (2024)
Wisconsin · Wisconsin DOR · Used for tax years 2024
Wisconsin Form C reports income and expenses allocated to Wisconsin and outside Wisconsin and reconciles book income or net income per income statement with net income. It also requests information about separate accounting permission, transfers between branches, and allocation m
What you'll need
Have these records and details available to complete Form C:
- Your name and Federal Employer ID Number.
- Income and expense details, including amounts allocated to Wisconsin, amounts allocated outside Wisconsin, and the basis of allocation.
- Federal Schedule M-1 or, for Schedule M-3 filers, the net income per income statement figured on a separate company basis and the adjustments from Schedule M-3, Parts II and III.
- The federal income additions and subtractions reported on your applicable Wisconsin Form 3, 4, 4T, 5S, or 6.
- Branch transfer amounts for sales, purchases, management fees paid, interest paid, and royalties paid.
The form also requires an attached explanation of how transfer prices were determined and an explanation of how income and expenses were allocated in and outside Wisconsin.
How to file
File 2024 Form C with Wisconsin Form 3, 4, 4T, 5S, or 6.
- Complete Part I to allocate income and expenses between Wisconsin and outside Wisconsin.
- Complete Part II to reconcile book income or net income per income statement with net income.
- Transfer line 16, column 1, to Form N, line 6, column a. Transfer line 16, column 3, to Form N, line 6, column b.
- Complete the additional information questions, including branch transfers and allocation explanations. Attach an explanation of how transfer prices were determined.
The provided form does not give a mailing address or e-filing directions.
Common mistakes
- Mismatched book income: Part I, line 5, column 3, must agree with federal Schedule M-1, line 1. For Schedule M-3 filers, it must agree with net income per income statement figured on a separate company basis.
- Inconsistent amounts between parts: Part II, line 6, must agree with Part I, line 5.
- Missing transfer-price explanation: The form requires an attached explanation of how transfer prices were determined.
Questions people ask
What do the three allocation columns show?
Column 1 shows amounts allocable to Wisconsin, column 2 shows amounts allocable outside Wisconsin, and column 3 shows the total.
How does Form C calculate allocable net income?
Line 15 identifies the amount of net income that will be apportioned instead of allocated. Line 16 subtracts that amount from line 14 to calculate allocable net income.
Does Form C ask about permission to use separate accounting?
Yes. Line 17 asks whether the taxpayer has obtained written permission from the Wisconsin Department of Revenue to use separate accounting. It provides Yes and No boxes.
What branch transfer information does Form C request?
Line 18 requests amounts for sales, purchases, management fees paid, interest paid, and royalties paid for transfers to Wisconsin branches and transfers to out-of-state branches. It also requires an attached explanation of how transfer prices were determined.