Wisconsin Department of Revenue - Wisconsin Sales and Use Tax Return - State, County, and City Sales and Use Tax

Sep 19, 2026

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Wisconsin Sales and Use Tax Return form ST-12 for reporting state, county, and city sales and use taxes. Provides sections to enter reporting period dates, tax account number (FEIN/SSN), business and contact information, and instructions for using black ink only. Includes detailed line items for total sales, subtractions, state sales tax, county and city computations using Schedule CT, discounts, net sales tax, use tax, and total amount due with interest and penalties, then signature and mailing submission.

LanguageEnglish

CategoryInvoices

FormatPDF

Pages4

Reading Time2 min

AccessFree to download

Sales Tax – State

Sales Tax – County and City

Sales Tax Before Discount

Discount and Net Sales Tax

Use Tax – State

Use Tax – County and City

Total Amount Due

Signature and Mailing Information

Schedule CT – County Sales and Use Tax

Important--to ensure this form works properly, Form ST-12 Wisconsin Department of Revenue Wisconsin Sales and Use Tax Return State, County, and City Sales and Use Tax save it to your computer before completing the form. | Period Begin Date (MM DD YYYY) | Period End Date (MM DD YYYY) | Due Date (MM DD YYYY) | | --- | --- | --- | | Tax Account Number | | --- | | FEIN / SSN | Tab to navigate throughout form. Please enter 15-digit number (no dashes) | Attention | | | | --- | --- | --- | | Business Name | | | | Legal Name | | | | Mailing Address-Street or PO Box | | | | City | State | Zip Code | Use BLACK INK Only Check if business discontinued (enter discontinuation date below) (MM DD YYYY) Check if address or name change (note changes at left) Check if this is an amended return Check if correspondence is included Step A Sales Tax – State 1 Total sales .............................................................. 1 Subtractions from total sales: 2 Sales for which you received exemption certificates ............... 2 3 Sales of exempt property and services (sales that occurred outside Wisconsin, real property, groceries and highway fuel, etc .) ......... 3 4 Sales returns, allowances, and bad debts ....................... 4 5 Other (sales tax included in line 1, etc .) ......................... 5 6 Total subtractions (add lines 2 through 5) ...................................... 6 7 Sales subject to state sales tax (subtract line 6 from line 1) ......................... 7 8 State sales tax (line 7 x . 05) ................................................. 8 Step B Sales Tax – County and City Complete Schedule CT (pages 3 and 4) Line 9 will autofill from Page 4, Column 1. 9 Enter total from Schedule CT, Col . 1 . . . . . 9a x .005 = 9b 10 Milwaukee County taxable sales after 2023 10a x .009 = 10b Milwaukee County taxable sales before 2024 10c x .005 = 10d 11 City of Milwaukee taxable sales after 2023 11a x .02 = 11b 12 For Department Use Only Step C Sales Tax Before Discount 13 Total sales tax (add lines 8, 9b, 10b, 10d and 11b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 S-012 (R. 4-25) Form ST-12 Page 2 of 4 | Step D Discount and Net Sales Tax | | --- | | 14 Total sales tax (fill in amount from line 13) ..................................... 14
15 Retailer’s discount (see instructions) .......................................... 15
16 Net sales tax (subtract line 15 from line 14) .................................... 16
Step E Use Tax – State | | 17 Purchases subject to state use tax 17a x .05 = 17b Step F Use Tax – County and City | Complete Schedule CT (pages 3 and 4) Line 18 will autofill from Page 4, Column 2. 18 Enter total from Schedule CT, Col . 2 . . . . . 18a x .005 = 18b 19 Milwaukee County taxable purchases after 2023 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19a x .009 = 19b Milwaukee County taxable purchases before 2024 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19c x .005 = 19d 20 City of Milwaukee taxable purchases after 2023 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20a x .02 = 20b 21 For Department Use Only Step G Total Amount Due 22 Total sales and use taxes (add lines 16, 17b, 18b, 19b, 19d and 20b) ................. 22 23 Interest ................................................................ 23 24 Late filing fee ($20.00) and negligence penalty ................................. 24 25 Total amount due (add lines 22 through 24) .................................... 25 Step H Signature and Mailing Information I hereby certify that this return, including any accomp

FAQs

What information is required to complete Form ST-12?

You must provide the reporting period start and end dates, tax account number (FEIN/SSN), business and legal names, mailing address, and contact person information. The form also requires sales and use tax calculations and a signature with date.

How are state sales tax and county/city taxes calculated?

State sales tax is computed from sales subject to state sales tax (line 7 x .05). County and city calculations use totals from Schedule CT and apply the relevant tax rates for Milwaukee County and the City of Milwaukee.

Where do Schedule CT figures come from and how are they used?

Schedule CT reports county sales subject to county sales tax and county purchases subject to county use tax by county and code. The totals from Schedule CT populate specific lines on the main form (autofill references are provided) for subsequent tax calculations.

Sep 19, 2026

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