1099 Quarterly Taxes in Wisconsin (2026)
If you're self-employed in Wisconsin — freelancer, contractor, gig worker, or single-member LLC — you owe quarterly estimated taxes to two agencies: the IRS (federal) and Wisconsin Department of Revenue (state). Wisconsin's top marginal rate is 7.65%, applied progressively. Getting your estimates right matters because under-payment penalties stack on top of the actual tax owed.
Wisconsin state income tax (2026)
Wisconsin uses a progressive bracket system on top of federal tax. For single filers in 2026:
| Income (single filer) | Marginal rate |
|---|---|
| $0 – $14,680 | 3.50% |
| $14,680 – $29,370 | 4.40% |
| $29,370 – $323,290 | 5.30% |
| $323,290+ | 7.65% |
How to pay Wisconsin estimated taxes
Federal estimated tax due dates (April 15, June 15, September 15, 2026, and January 15, 2027) apply to your Wisconsin state estimated payments as well — most states piggyback on the federal schedule. Pay Wisconsin taxes through the Wisconsin Department of Revenue's online portal: www.revenue.wi.gov. You can also mail Form 1-ES with a check.
Wisconsin-specific quirk freelancers miss
Wisconsin has wide brackets — the 5.30% bracket spans roughly $28k to $315k, capturing most middle-income freelancers. The top 7.65% rate only applies above $315,310 for single filers.
Common deductions for Wisconsin freelancers
- Wisconsin allows the same business expenses (home office, mileage, software, etc.) as federal.
- Half of SE tax is deductible federally; check Wisconsin's rules for state conformity.
- WI conforms to federal QBI deduction.
- SEP-IRA / Solo 401(k) contributions reduce both federal and Wisconsin taxable income.
- Self-employed health insurance premiums are deductible federally.