Finance · Wisconsin · Tax year 2026
Wisconsin Self-Employment Tax Calculator 2026
On $100,000 of 2026 self-employment profit, a single Wisconsin sole proprietor with no other income owes about $26,373: $14,130 of self-employment tax, $8,235 of federal income tax, and $4,008 of Wisconsin income tax. That is 26.4% of profit, or $6,593 for each quarterly estimated payment.
Against its neighbors, the same $100,000 of profit costs $788 more in Minnesota and $1,712 less in Iowa.
- State income tax
- 3.5% to 7.65%
- Wisconsin tax on $100,000
- $4,008
- National rank
- #18 highest of 51
- Set aside on $100,000
- 26.4%
- State estimated payments
- Form 1-ES
- LLC filing fee
- $130
- State sales tax
- 5% + local
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Enter your net profit — revenue minus business expenses — to see how much to set aside and what to pay each quarter.
A 2026 planning estimate using the standard deduction, not a tax return: it ignores credits, itemized deductions, and AMT. All calculations happen in your browser. Nothing is stored.
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Wisconsin self-employment tax at common profit levels
2026 estimates for a single filer with no other income, using the standard deduction and no retirement or health insurance deductions. "Set aside" is the share of profit to move into a tax account; "Quarterly" is each of the four estimated payments.
| Profit | SE tax | Federal income tax | Wisconsin tax | Total | Set aside | Quarterly |
|---|---|---|---|---|---|---|
| $40,000 | $5,652 | $1,775 | $945 | $8,372 | 20.9% | $2,093 |
| $60,000 | $8,478 | $3,559 | $1,861 | $13,898 | 23.2% | $3,474 |
| $80,000 | $11,304 | $5,344 | $2,905 | $19,552 | 24.4% | $4,888 |
| $100,000 | $14,130 | $8,235 | $4,008 | $26,373 | 26.4% | $6,593 |
| $150,000 | $21,194 | $16,413 | $6,748 | $44,355 | 29.6% | $11,089 |
| $250,000 | $29,851 | $36,509 | $11,826 | $78,186 | 31.3% | $19,546 |
Married filing jointly
The same profit, earned by one spouse filing jointly with no other household income.
| Profit | SE tax | Federal income tax | Wisconsin tax | Total | Set aside | Quarterly |
|---|---|---|---|---|---|---|
| $40,000 | $5,652 | $398 | $404 | $6,454 | 16.1% | $1,613 |
| $60,000 | $8,478 | $1,885 | $1,306 | $11,669 | 19.4% | $2,917 |
| $80,000 | $11,304 | $3,550 | $2,286 | $17,140 | 21.4% | $4,285 |
| $100,000 | $14,130 | $5,335 | $3,347 | $22,811 | 22.8% | $5,703 |
| $150,000 | $21,194 | $9,795 | $6,297 | $37,287 | 24.9% | $9,322 |
| $250,000 | $29,573 | $25,154 | $11,587 | $66,315 | 26.5% | $16,579 |
How Wisconsin taxes self-employment income
Wisconsin starts from federal adjusted gross income (after the deduction for half of self-employment tax), then applies its own deductions, exemptions, and credits.
- Standard deduction: $13,960 single, $25,840 joint, $18,030 head of household
- Personal exemption: $700 single, $1,400 joint, $700 head of household
- Top rate: 7.65%; your bracket on $100,000 of profit is 5.3%.
2026 Wisconsin income tax brackets (single)
| Taxable income over | Up to | Rate |
|---|---|---|
| $0 | $15,110 | 3.5% |
| $15,110 | $51,950 | 4.4% |
| $51,950 | $332,720 | 5.3% |
| $332,720 | and up | 7.65% |
2026 Wisconsin brackets (married filing jointly)
| Taxable income over | Up to | Rate |
|---|---|---|
| $0 | $20,150 | 3.5% |
| $20,150 | $69,260 | 4.4% |
| $69,260 | $443,630 | 5.3% |
| $443,630 | and up | 7.65% |
Wisconsin vs its neighbors
The same $100,000 of 2026 profit for a single sole proprietor, run through each state's rules. Federal tax is the same everywhere, so the difference is state income tax. Against its neighbors, the same $100,000 of profit costs $788 more in Minnesota and $1,712 less in Iowa.
| State | State income tax | Total tax | Set aside | vs Wisconsin |
|---|---|---|---|---|
| Wisconsin | $4,008 | $26,373 | 26.4% | — |
| Illinois | $4,456 | $26,820 | 26.8% | +$447 |
| Iowa | $2,296 | $24,660 | 24.7% | −$1,712 |
| Michigan | $3,699 | $26,064 | 26.1% | −$309 |
| Minnesota | $4,796 | $27,161 | 27.2% | +$788 |
How the gap changes with profit
Extra tax (+) or savings (−) for a single filer if the same business were based in each of its neighbors instead of Wisconsin.
| Profit | Illinois | Iowa | Michigan | Minnesota |
|---|---|---|---|---|
| $40,000 | +$751 | −$344 | +$384 | +$226 |
| $60,000 | +$755 | −$695 | +$258 | +$408 |
| $80,000 | +$631 | −$1,174 | +$4 | +$627 |
| $100,000 | +$447 | −$1,712 | −$309 | +$788 |
| $150,000 | +$8 | −$3,039 | −$1,074 | +$1,362 |
| $250,000 | −$327 | −$4,913 | −$2,080 | +$4,141 |
What's different about Wisconsin for the self-employed
- Wisconsin's standard deduction shrinks as income rises and disappears above about $136,000 single / $160,000 joint.
- No local income taxes.
- Business Tax Registration (needed for a seller's permit and other DOR permits) costs $20 initially and covers two years, then $10 per two-year renewal.
- Seventy counties add a 0.5% county sales tax. Milwaukee County's is 0.9%, and the city of Milwaukee adds its own 2% city sales tax, the only city tax in the state.
Wisconsin estimated payments and deadlines
Wisconsin collects its own estimated income tax with Form 1-ES, separately from the IRS. Required if you expect to owe at least $500 in Wisconsin tax for 2026 after subtracting withholding and credits.
| Installment | Wisconsin due date | Share of the year | Federal due date |
|---|---|---|---|
| Q1 | April 15, 2026 | 25% | April 15, 2026 |
| Q2 | June 15, 2026 | 25% | June 15, 2026 |
| Q3 | September 15, 2026 | 25% | September 15, 2026 |
| Q4 | January 15, 2027 | 25% | January 15, 2027 |
The 2026 Wisconsin income tax return is due April 15, 2027.
File and pay through the Wisconsin Department of Revenue.
LLC fees and sales tax in Wisconsin
- Forming an LLC: $130 state filing fee.
- Annual Report: $25, every year, due by the end of your anniversary quarter.
- Sales tax: 5% statewide, plus local rates in many cities and counties. Use the Sales Tax Calculator to price a sale.
A single-member LLC is taxed exactly like a sole proprietorship unless it elects S or C corporation status, so the self-employment tax figures on this page apply either way.
Wisconsin self-employment tax FAQs
How much should I set aside for taxes if I'm self-employed in Wisconsin?
For a single filer with no other income, about 23.2% of profit at $60,000, 26.4% at $100,000, and 29.6% at $150,000 for 2026, covering self-employment tax, federal income tax, and Wisconsin income tax. Enter your own numbers in the calculator for a personal figure.
Does Wisconsin tax self-employment income?
Yes. Wisconsin taxes self-employment profit as ordinary income at 3.5% to 7.65%. Wisconsin starts from federal adjusted gross income (after the deduction for half of self-employment tax), then applies its own deductions, exemptions, and credits.
When are Wisconsin estimated tax payments due for 2026?
April 15, 2026, June 15, 2026, September 15, 2026, January 15, 2027, using Form 1-ES. Required if you expect to owe at least $500 in Wisconsin tax for 2026 after subtracting withholding and credits.
How much does an LLC cost in Wisconsin?
The state filing fee to form an LLC is $130. Annual Report: $25, every year, due by the end of your anniversary quarter. A single-member LLC is still taxed like a sole proprietorship for federal purposes, so the self-employment tax figures above apply.
Sources and method
Computed with the Self-Employment Tax Calculator's 2026 engine and Wisconsin's rules from the sources below. Planning estimates, not a return. Last checked 2026-10-08.
- www.revenue.wi.gov/TaxForms2026/2026-Form1-ES-inst.pdf
- www.revenue.wi.gov/TaxForms2026/2026-Form1-ES-Inst.pdf
- docs.legis.wisconsin.gov/statutes/statutes/71/i/03/6
- docs.legis.wisconsin.gov/statutes/statutes/183/i/0120
- dfi.wi.gov/Documents/BusinessServices/BusinessEntities/Forms/CORP5i.pdf
- www.revenue.wi.gov/Pages/FAQS/pcs-taxrates.aspx
- www.revenue.wi.gov/Pages/FAQS/pcs-btr.aspx
- www.revenue.wi.gov/Pages/FAQS/pcs-county.aspx