State guide · Wisconsin · 2026 rules

S corporation in Wisconsin: what the election changes

Wisconsin follows the federal election and puts no regular tax on a small S corporation. The main state change is unemployment tax on your salary.

Updated October 24, 202610 official sources

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You’ll need: last year’s Schedule C (line 31) and the W-2 from any job you also hold. Everything else starts at a typical value you can change.

State where the business is Each state treats the election differently. The check shows only the questions that matter there.

Net profit for the year, before paying yourself Your business's profit after expenses. Money you take out for yourself does not lower it.

Where do I find this?

Schedule C, line 31 (“Net profit or (loss)”) on last year’s return.

For this year: sales minus business expenses so far, scaled to a full year. Owner draws are not an expense.

Salary you would pay yourself as an S corporation What you would pay yourself through payroll. The IRS expects a reasonable salary for the work you do.

Where do I find this?

No form shows this yet: you choose it. It should be about what you would pay someone else to do your work.

The salary finder just below shows what employees in your job earn in your state or metro area. What the IRS looks at.

Salary finder: what people in your job earn (BLS)

Your job Pick the job closest to what you do most of the week.

Area Pick your metro area if it is listed. Pay varies by area.

Another job I also earn W-2 wages from a job outside this business

Typical values: change them if you know yours

Payroll service, per year typical value Published one-person prices: $492 to $684 a year (October 2026).

Where do I find this?

Your payroll provider’s price page or quote, for one employee: you. Published prices compared.

Extra tax-prep cost for the S-corp return typical value A survey average: the fee for Form 1120-S minus the fee for Schedule C (2020 fees).

Where do I find this?

Ask your preparer what a Form 1120-S (the S corporation’s own return) would cost, then subtract what you pay now for Schedule C.

Your top federal income tax rate Not sure? Keep 22%. It changes line 5 only.

Where do I find this?

Your taxable income is on Form 1040, line 15. Find the rate for that income and your filing status in the IRS rates and brackets table.

Filing status Changes the result only above $200,000 of earnings ($250,000 if married filing jointly, $125,000 if married filing separately).

Where do I find this?

The box checked under Filing Status at the top of your Form 1040.

Choose a state and enter your profit and salary to see the comparison.

The state

A federal S corporation is a Wisconsin tax-option (S) corporation with no separate election. It files Form 5S each year. It can opt out on Form 5E.

The income passes to you, and you pay Wisconsin income tax on it, as a sole proprietor or single-member LLC owner does today. The economic development surcharge reaches only corporations with gross receipts of $4 million or more.

An LLC that elects stays an LLC and keeps filing the $25 annual report.

Unemployment tax on your salary

Unemployment insurance: 3.05% for a new employer on the first $14,000 of wages in 2026 (2.50% in construction). Officers are covered by default, and the calculator counts this tax on your salary.

An S corporation can file a notice to exclude principal officers who own 25% or more. The option is open only while the prior year’s payroll is under $500,000. A new employer files the notice by the date its first contributions are due; after that, by March 31 for the year. With the exclusion, the business owes no Wisconsin unemployment tax on your salary but pays the full federal unemployment tax.

The optional pass-through entity tax

A one-owner S corporation can elect to pay Wisconsin tax at the entity level at 7.9% of its Wisconsin net income, on Form 5S with Schedule 5S-ET. You then leave that income out of your Wisconsin adjusted gross income. The calculator leaves it out.

Worked examples

A single-member LLC owner, single filer, 22% federal bracket, default payroll and return costs. The figure is total tax and added costs as an S corporation compared with staying as you are.

Profit / salary	Statewide
$80,000 / $45,000	$583 lower
$120,000 / $60,000	$2,984 lower
$200,000 / $90,000	$7,765 lower

Starting payroll in Wisconsin

Register for state withholding with the Wisconsin Department of Revenue (Business Tax Registration), and for unemployment insurance with the Department of Workforce Development.

New hire paperwork for Wisconsin

Other states

All state guides and the map

Sources

Federal figures: IRS Publication 15 (2026), Schedule SE and Form 2553 instructions. Every figure was read on an official page and checked a second time. Checked October 24, 2026. How we check facts.

An estimate from public rules, not tax advice.

Ready to elect? See the Form 2553 steps.

Electing S corp status