Wisconsin Bonus Pay Tax Calculator

2026 Wisconsin bonus withholding

Wisconsin Bonus Pay Tax Calculator

Estimate a Wisconsin employee's net bonus with the state's 2026 annual-salary flat percentages or combined-payroll method, federal supplemental-wage rules, FICA thresholds, reciprocity controls, employer costs, and net-to-gross planning.

Calculate a Wisconsin paycheck Explore TimeTrex payroll

Bonus inputs

Use gross-to-net for a planned bonus or net-to-gross when a take-home amount was promised.

Gross bonus amount Enter the taxable bonus to be paid.

Supplemental pay type

Federal withholding method

Payment presentation Payment presentation controls federal method eligibility. Wisconsin's annual-salary flat schedule and combined-payroll method are selected separately under the state settings.

Regular wages had federal income tax withheld

The optional 22% federal flat method generally depends on regular wages having had income tax withheld in the current or prior year.

Pay frequency

YTD Social Security wages from this employer Used only for the 2026 $184,500 Social Security wage-base check.

YTD Medicare wages from this employer Used for the employer's $200,000 Additional Medicare withholding threshold.

YTD supplemental wages before bonus Include supplemental wages paid in 2026 by this employer and businesses under common control for the $1 million federal test.

Regular wages for this pay period Used for aggregate withholding comparisons.

Federal W-4 settings

Federal filing status

Use higher W-4 Step 2 checkbox tables

Annual credits from W-4 Step 3

Annual other income from W-4 Step 4(a)

Annual deductions from W-4 Step 4(b)

Extra federal withholding per regular check

Extra federal withholding on this bonus

Wisconsin withholding settings

Wisconsin withholding profile Reciprocity applies only to qualifying employee compensation for Illinois, Indiana, Kentucky, or Michigan residents. Minnesota is not reciprocal.

Wisconsin income-tax withholding applies

The profile sets this control, but it remains editable for documented exceptions. Do not clear it merely because a bonus is paid separately.

Wisconsin bonus withholding method W-166 permits flat supplemental percentages based on estimated annual gross salary, or a combined calculation using current or preceding regular-period wages.

Estimated annual gross salary Used only to choose the 3.54%, 4.65%, 5.30%, or 7.65% flat supplemental percentage. W-166 does not define a universal bonus rate.

Wisconsin-taxable bonus percentage Use 100% for a Wisconsin resident or fully Wisconsin-taxable bonus. Other nonresidents should use a reasonable Wisconsin-source allocation for the payroll period.

Regular Wisconsin-taxable wages for comparison period For the combined method, use current regular-period Wisconsin wages or the last preceding regular period in the same calendar year, as applicable.

WT-4 withholding status Used only by the combined payroll-period method. Wisconsin Form WT-4, not federal Form W-4, controls this setting.

WT-4 withholding exemptions The W-166 annualized method subtracts $400 per exemption. Exemptions do not select the separate flat supplemental percentage.

Additional Wisconsin withholding on this payment Optional additional amount requested on Form WT-4 or in an accepted written withholding request.

Employer cost estimate settings

2026 Wisconsin UI rate preset Experienced employers should use the assigned Schedule D rate from DWD rather than a new-employer preset.

YTD Wisconsin UI-taxable wages before bonus Used only for the employer-side Wisconsin unemployment wage-base estimate.

Wisconsin UI wage base The official 2026 taxable wage base is $14,000 per employee.

Wisconsin UI employer rate The default is the 2026 new nonconstruction rate for payroll under $500,000. Enter the assigned DWD rate when known.

Wisconsin UI-covered bonus percentage Bonuses are Wisconsin UI wages in covered employment. UI localization can differ from income-tax sourcing; this changes employer cost only.

YTD FUTA wages before bonus Used only for the employer-side $7,000 FUTA wage-base estimate.

Estimated net FUTA rate Default assumes the full 5.4% state credit. Final 2026 credit-reduction status is determined after November 10.

Estimated net bonus

Federal flat method with Wisconsin's 2026 annual-salary flat alternative.

Net bonus $0.00 Tax withholding estimate updates as inputs change.

Gross bonus $0.00

Total withheld $0.00

Effective withholding 0.00%

Employer cost estimate $0.00

Withholding line	Amount

Method comparison

Method	Net bonus	Total withheld

What this calculator includes

Two Wisconsin methods

Use the W-166 annual-salary flat schedule or isolate the bonus from a combined payroll-period calculation using WT-4 status and exemptions.

Federal supplemental methods

Model the optional 22% method, mandatory 37% treatment only above $1 million, and the aggregate method using 2026 Publication 15-T.

Separate employee and employer taxes

Test Social Security, Additional Medicare, Wisconsin UI, and FUTA against separate year-to-date wage inputs without reducing take-home by employer-only taxes.

This is a 2026 withholding estimate for an ordinary taxable cash bonus paid to a W-2 employee. It assumes the entered allocated bonus is taxable for each selected tax. Pretax benefits, retirement deferrals, garnishments, fringe-benefit valuation, wage exclusions, successor-employer rules, common-paymaster rules, nonresident sourcing, UI localization, same-period supplemental payments, DOR lock-in instructions, and payroll-provider rounding can change the paycheck.

Wisconsin bonus withholding FAQ

Does Wisconsin have one flat bonus tax rate?

No. W-166 lists four flat supplemental percentages based on estimated annual gross salary: 3.54%, 4.65%, 5.30%, and 7.65%. They are withholding percentages, not final tax rates.

How does the combined Wisconsin method work?

Calculate withholding on regular Wisconsin-taxable wages plus the bonus for one payroll period, then subtract withholding on regular wages alone. The calculator uses the official annualized W-166 formula.

Is 7.65% required for every bonus?

No. Under the flat alternative it applies only when estimated annual gross salary is at least $280,950. The selected combined method can produce a different incremental amount.

Can reciprocity remove Wisconsin withholding?

Yes. Qualifying Illinois, Indiana, Kentucky, or Michigan residents working in Wisconsin generally file Form W-220. Minnesota is not a reciprocal state.

Does Wisconsin have a local wage income tax?

No. Wisconsin law bars political subdivisions from levying a tax on income, so the local wage income-tax line is $0.

When can an employer use federal 22% withholding?

It is optional for an eligible separately paid or separately identified supplemental amount when federal income tax was withheld from regular wages in the current or immediately preceding year.

Does Wisconsin unemployment insurance reduce the bonus?

No. Wisconsin UI is employer-financed. The employer-cost estimate uses the $14,000 wage base and an editable assigned or new-employer rate.

Can this calculator gross up a promised net bonus?

Yes. Net-to-gross mode solves across federal method rules, the selected Wisconsin method, Social Security, Medicare, and Additional Medicare thresholds.

Research sources

Rates and formulas are based on primary official material checked on July 20, 2026. Recheck year-specific guides, assigned UI rates, and federal updates before later-year payroll.

Wisconsin Department of RevenuePublication W-166 (1/26): withholding methods and tables

Wisconsin Department of RevenuePublication 121 (1/26): reciprocity

Wisconsin Department of RevenueForm WT-4: status, exemptions, and additional withholding

Wisconsin LegislatureWis. Stat. 66.0611: local income-tax prohibition

Wisconsin DWD2026 unemployment tax rates and $14,000 wage base

Wisconsin DWDBonuses included in Wisconsin UI wages

Wisconsin DWDEmployer financing of Wisconsin UI

IRSPublication 15 (Circular E), 2026

IRSPublication 15-T, 2026

IRSFUTA credit-reduction timing

Social Security Administration2026 contribution and benefit base

TimeTrexWisconsin payroll tax calculator

Move from a bonus estimate to a complete Wisconsin paycheck

Need the full paycheck picture? Estimate regular wages, federal withholding, Wisconsin income tax, Social Security, and Medicare with TimeTrex's free Wisconsin Payroll Tax Calculator, or connect approved earnings and payroll records in one workflow.

Calculate a Wisconsin paycheck Explore TimeTrex payroll

Disclaimer: This calculator provides estimated withholding figures for educational and informational purposes only and does not constitute formal tax, legal, or accounting advice. Calculations reflect standard federal supplemental wage withholding methods, Wisconsin Pub. W-166 annual-salary flat alternatives, combined payroll-period options, reciprocity rules, and standard FICA parameters; actual take-home pay or employer tax liability may vary based on pretax benefits, Form WT-4 exemptions, multi-state sourcing, or payroll-provider rounding.

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Disclaimer: The content provided on this webpage is for informational purposes only and is not intended to be a substitute for professional advice. While we strive to ensure the accuracy and timeliness of the information presented here, the details may change over time or vary in different jurisdictions. Therefore, we do not guarantee the completeness, reliability, or absolute accuracy of this information. The information on this page should not be used as a basis for making legal, financial, or any other key decisions. We strongly advise consulting with a qualified professional or expert in the relevant field for specific advice, guidance, or services. By using this webpage, you acknowledge that the information is offered “as is” and that we are not liable for any errors, omissions, or inaccuracies in the content, nor for any actions taken based on the information provided. We shall not be held liable for any direct, indirect, incidental, consequential, or punitive damages arising out of your access to, use of, or reliance on any content on this page.

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Wisconsin Bonus Pay Tax Calculator