If you live in Wisconsin and work in Minnesota, taxes get filed in both states every year: Minnesota withholds and taxes the wages you earn there as a nonresident, and Wisconsin taxes all of your income because you’re a resident. A credit on Wisconsin Schedule OS keeps the same wages from being taxed twice, but only if you file the two returns in the right order and attach the right paperwork.
Why You Owe Tax in Both States
Wisconsin and Minnesota used to have a reciprocity agreement that let cross-border commuters pay tax only to their home state. Minnesota ended that arrangement effective tax year 2010.1Wisconsin State Legislature. Revenue Minnesota-Wisconsin Income Tax Reciprocity Study Since then, the default rules apply: Minnesota taxes wages for work physically performed in the state, and Wisconsin taxes its residents on income from every source. Those overlapping claims are what create the dual return.
Do the Minnesota Return First
You have a Minnesota filing obligation if your Minnesota gross income meets the state’s minimum threshold, which was $14,950 for 2025.2Minnesota Department of Revenue. Nonresidents – Income Tax Fact Sheet 3 A regular commuter clears that in the first few months of the year, so in practice you’re filing.
File Minnesota Form M1 with Schedule M1NR attached. M1 starts from the federal adjusted gross income on line 11 of your federal 1040, then applies Minnesota’s adjustments, deductions, and progressive rates to compute a full-year tax as though you were a resident.3Minnesota Department of Revenue. 2025 Form M1, Individual Income Tax Return Schedule M1NR then calculates the ratio of your Minnesota-source income to your total federal income, carried to five decimal places, and multiplies that ratio against the full-year tax.4Minnesota Department of Revenue. 2025 Schedule M1NR, Nonresidents/Part-Year Residents That product is your actual Minnesota liability.
If Minnesota wages are your only income, the ratio sits near 1.0 and Minnesota taxes nearly all of it. If you also have Wisconsin-based investment income, rental income, or a side business, the ratio drops and so does the Minnesota bill. Minnesota requires the same filing status you used federally.5Minnesota Department of Revenue. Filing Status for Individuals
Minnesota’s rates run higher than Wisconsin’s at every bracket, topping out at 9.85%.6Minnesota Department of Revenue. Income Tax Rates and Brackets That rate gap matters when it comes time to claim the Wisconsin credit.
Then File Wisconsin
Wisconsin Form 1 reports your full federal adjusted gross income, Minnesota wages included.7Wisconsin Department of Revenue. 2025 Form 1 Instructions – Wisconsin Income Tax Wisconsin’s progressive rates run from 3.50% to a top rate of 7.65%.8Wisconsin Department of Revenue. DOR Tax Rates The tax Form 1 produces before credits is a preliminary number that still includes tax on wages Minnesota already taxed. Schedule OS fixes that.
How Schedule OS Handles the Double Tax
Schedule OS (Credit for Net Tax Paid to Another State) reconciles the overlap. You take the final Minnesota tax figure from your M1 and use it on Schedule OS to reduce what you owe Wisconsin.9Wisconsin Department of Revenue. 2025 Schedule OS Instructions This is why the Minnesota return has to be finished first. Working out of order means doing the whole thing twice.
The credit is not dollar-for-dollar. Wisconsin law caps it at the lesser of:10Wisconsin State Legislature. Wisconsin Statutes 71.07(7) – Other State Tax Credit
- the actual Minnesota tax you paid on income Wisconsin also taxes, or
- the Wisconsin tax attributable to that same income, found by multiplying your net Wisconsin tax by the ratio of Minnesota-taxed income to your total Wisconsin adjusted gross income.
You claim whichever is smaller. Because Minnesota’s rates run higher than Wisconsin’s, most commuters hit the second cap. Wisconsin will not credit more tax than it would have charged on the same wages. The practical result is that you pay Minnesota’s higher rate on the Minnesota income and Wisconsin waives its own claim only up to what Wisconsin would have charged. The difference is real money that a Wisconsin-only worker would not owe.
Attach both pages of Schedule OS, a complete copy of your Minnesota Form M1 and Schedule M1NR, and the W-2 or other statements showing Minnesota tax withheld. Missing any of that will stall your refund while the Wisconsin Department of Revenue writes to ask for it.9Wisconsin Department of Revenue. 2025 Schedule OS Instructions
Remote Work Days Change the Math
Minnesota only taxes wages for work physically performed inside the state.11Minnesota House of Representatives Research Department. Income Taxation of Residents and Nonresidents A day worked from your home in Wisconsin is a Wisconsin work day. Shifting days from Minnesota to Wisconsin lowers the M1NR ratio, cuts your Minnesota tax, and because Minnesota’s rate is the higher of the two, usually lowers your combined bill.
You need records to back the split. Keep a calendar or work log showing where you were each day. Any day you are physically present in Minnesota for even part of a workday counts as a Minnesota day. If you have a hybrid schedule, make sure your employer tracks location for withholding, because Minnesota expects employers to withhold only on wages tied to in-state work, and sloppy tracking leads to over-withholding you have to chase as a refund.
Withholding and Wisconsin Estimated Payments
Your Minnesota employer withholds Minnesota tax automatically. File Minnesota Form W-4MN with the employer so the withholding tracks your actual liability; the federal W-4 does not control Minnesota withholding.12Minnesota Department of Revenue. 2025 W-4MN, Minnesota Withholding Allowance/Exemption Certificate
The Wisconsin side is where commuters get caught. A Minnesota-based employer usually isn’t set up to withhold Wisconsin tax, and the Schedule OS credit covers most but not all of the Wisconsin liability. If you expect to owe Wisconsin $500 or more after the credit, you need to make quarterly estimated payments using Form 1-ES. The due dates are April 15, June 15, September 15, and January 15 of the following year.13Wisconsin Department of Revenue. DOR Individual Income Tax – Estimated Tax Payments If your employer will withhold Wisconsin tax via Form WT-4, that’s easier, but not every out-of-state employer offers it.
Wisconsin’s safe harbor is 90% of the current-year Wisconsin tax or 100% of the prior year, whichever is smaller.13Wisconsin Department of Revenue. DOR Individual Income Tax – Estimated Tax Payments Wisconsin does not raise that threshold for higher-income filers the way federal law does. The credit only applies when you file the return, so it does not excuse the obligation to pay during the year.
At year end, your W-2 shows Minnesota wages in Box 16 and Minnesota tax withheld in Box 17. Those numbers move directly to Form M1 and to Schedule OS. Review Form W-4MN once a year and whenever income or filing status changes.
Deadlines and Penalties
Both returns are due April 15. Minnesota grants an automatic extension to October 15 with no request required, but the extension covers filing only. Tax owed to Minnesota still has to be paid by April 15 to avoid penalty and interest.14Minnesota Department of Revenue. Filing After the Due Date
Minnesota’s late-payment penalty is 4% of unpaid tax, with additional layers for continued nonpayment and for negligence.15Minnesota Department of Revenue. Penalties and Interest for Individuals A separate Minnesota underpayment penalty applies through Schedule M15 if withholding falls short during the year.
Wisconsin charges interest on underpaid estimated tax at 12% per year under current law. The common trap for cross-border filers is skipping Wisconsin estimated payments entirely because Minnesota is doing all the withholding. That leaves you with a Wisconsin balance due in April plus an underpayment penalty, even though Schedule OS ultimately covers most of the tax.
Practical Notes for Mixed Households
Households with income from sources beyond a single Minnesota job often see more forgiving math. A spouse’s Wisconsin wages, rental income, and investment income all lower the M1NR ratio and also feed into the Schedule OS limitation, changing how much of the Minnesota tax Wisconsin will actually credit. If the numbers are not straightforward, the cost of professional preparation for a two-state return is usually justified by the penalties waiting on either side of the border.