Wisconsin Payroll Taxes and Withholding Guide (2026)

What Makes Wisconsin Payroll Different

Federal payroll tax is the same in every state. What changes from one state to the next is the second layer: state income tax withholding, employer unemployment taxes, and any local wage taxes. Wisconsin keeps that second layer simple in one sense and unusual in another. There is no local wage tax anywhere in the state, and no employee-paid unemployment or disability contribution, so a Wisconsin stub is short. But the state income tax is withheld with a mechanism most states do not use.

Wisconsin's distinctive feature is the sliding standard deduction. Instead of subtracting a fixed dollar amount before applying the rate schedule, the withholding formula subtracts a deduction that shrinks as income rises and disappears entirely near $73,000. The result is that Wisconsin's effective withholding rate climbs faster than the bracket schedule alone would suggest, and higher earners are taxed on essentially all of their wages. The federal baseline behind all of this is explained in the how payroll taxes work guide.

Employee Withholding Overview in Wisconsin

A Wisconsin employee sees federal taxes and a graduated state tax, and nothing else that is state-mandated. There is no employee unemployment line, no state disability line, and no local wage line.

The federal lines work identically to any other state. For Social Security, the 2026 wage base is $184,500, after which Social Security stops for the year. Medicare has no cap. What is unique to Wisconsin is that the state line is graduated but paired with a phasing-out standard deduction, and there is no local wage tax and no employee unemployment contribution at all.

How Is Wisconsin State Income Tax Withheld?

Wisconsin uses the alternate method in the Department of Revenue's annual Publication W-166, Withholding Tax Guide. The employer annualizes wages, subtracts the sliding standard deduction (below), subtracts $400 for each WT-4 exemption to reach the annual net wage, applies the rate schedule, then divides across pay periods. The withholding schedule below applies to the annual net wage.

These are the Publication W-166 withholding-formula rates. The Department of Revenue confirmed current withholding rates continue for 2025, and the guide reflects laws in effect as of January 2026. Your final Wisconsin income tax is settled on Form 1, where the statutory brackets are 3.50%, 4.40%, 5.30%, and 7.65%. The federal Form W-4 sets federal withholding, covered in the W-4 withholding explained guide, while Form WT-4 sets the Wisconsin status, exemptions, and any additional Wisconsin amount.

The Sliding Standard Deduction

This is the layer that defines Wisconsin withholding. Rather than a fixed standard deduction, Wisconsin subtracts a deduction that phases down as income rises. In the withholding formula it works like this:

A single employee earning $30,000 keeps most of the deduction ($6,702 − 12% of $12,220 = $5,235.60). At $65,000 only $1,035.60 survives, and above $73,630 the deduction is zero. Married filers start higher at $9,461 but phase out twice as fast, at 20 cents per dollar, so the married deduction is also gone by about $73,000. The practical effect is that Wisconsin's effective rate rises with income more steeply than a fixed-deduction state, and two higher earners feel the schedule with almost no offset. The Wisconsin paycheck calculator shows exactly how much of the deduction is being used at your income.

Wisconsin Withholding (Form WT-4)

Form WT-4, the Employee's Wisconsin Withholding Exemption Certificate, is Wisconsin's version of the federal W-4. The federal Form W-4 cannot be used for Wisconsin withholding. WT-4 sets a filing status and an exemption count.

Status and Exemptions

The WT-4 status (single or married) selects which sliding-deduction formula applies. Each withholding exemption removes $400 of annual wages before the rate schedule is applied. Employees count themselves, a spouse, and dependents, subject to the WT-4 worksheet.

The most common WT-4 mistake is not filing one at all. An employee who completed only a federal W-4 at hire is defaulted to zero Wisconsin exemptions and is over-withheld all year. A quick WT-4 with the right status and exemption count fixes it. To see how status and exemptions change take-home pay, use the Wisconsin paycheck calculator.

Wisconsin Income Tax Reciprocity

Wisconsin has reciprocal income tax agreements with four neighboring states: Illinois, Indiana, Kentucky, and Michigan. Reciprocity means a resident of one of those states who works in Wisconsin pays income tax only to their home state, not to Wisconsin.

To claim it, the employee files Form W-220, Nonresident Employee's Withholding Reciprocity Declaration, with the Wisconsin employer, and the employer stops withholding Wisconsin income tax. A Wisconsin resident working in Illinois, Indiana, Kentucky, or Michigan does the reverse and pays only Wisconsin tax. Reciprocity covers wages, salaries, and commissions from personal services; it does not cover business or self-employment income, which the source state can still tax. When the W-220 is missing, both states can end up withholding at once, and the worker files an extra nonresident return to reclaim the wrongly withheld tax.

Employer Payroll Obligations in Wisconsin

Wisconsin employers carry the federal employer taxes plus State Unemployment Insurance through the Department of Workforce Development. The federal side, covered in the employer payroll tax obligations guide, includes the matching 6.2% Social Security and 1.45% Medicare plus Federal Unemployment Tax (FUTA). On top of that, Wisconsin adds the employer unemployment contribution. There is no employee unemployment contribution to withhold.

The Wisconsin unemployment taxable wage base is $14,000 per employee for 2026, so the employer unemployment tax stops once an employee's year-to-date wages pass $14,000. Schedule D, the lowest rate schedule, is in effect for 2026. New non-construction employers pay a 3.05% entry rate before moving to an experience-rated rate; these are employer costs and are never deducted from employee pay. Model the combined cost-to-hire with the employer payroll tax calculator.

Wisconsin Has No Employee Unemployment Deduction

A handful of states, including Pennsylvania and New Jersey, take a small unemployment contribution directly from employee wages. Wisconsin is not one of them. The entire cost of Wisconsin unemployment insurance falls on employers through the Department of Workforce Development, so there is no employee unemployment line on a Wisconsin pay stub at all.

This matters most for workers who move to Wisconsin from a state that does deduct employee unemployment and expect to see the same line. In Wisconsin that line simply does not exist, and its absence is correct, not a payroll error. Wisconsin also has no state-run disability insurance deduction and no paid-family-leave payroll deduction, so the mandatory deductions on a Wisconsin stub are federal taxes and the graduated state income tax, with no local or social-insurance lines.

Wisconsin Supplemental Wage Withholding

Supplemental wages are payments outside regular salary: bonuses, commissions, overtime, sales awards, and back pay. Wisconsin gives employers a choice on the state line.

• Aggregate method: add the supplemental wages to regular wages and run the combined amount through the standard withholding formula.
• Flat-percentage method: apply a flat rate based on the employee's estimated annual salary band, 3.54% up to $12,760, 4.65% to $25,520, 5.30% to $280,950, and 7.65% above that. These flat percentages may be used only for supplemental payments.
• Local wage tax: none, on supplemental wages or regular wages.
• Employee unemployment: none, on supplemental wages or regular wages.

Federal income tax withholding on supplemental wages is a separate calculation set by the IRS, and Social Security and Medicare still apply under their own rules. For the federal supplemental math, use the Bonus Tax Calculator.

Wisconsin Filing and Payment Frequency

Wisconsin employers deposit withheld state income tax using Form WT-6 on a schedule (annual, quarterly, monthly, or semi-monthly) based on the amount withheld, and reconcile annually on Form WT-7, the Employer's Annual Reconciliation. The Department of Revenue's Publication W-166 sets out the deposit schedule and the withholding tables. The federal deposit schedule is covered separately in the payroll tax deadlines guide.

Unemployment tax is reported and paid separately from income tax withholding, on a quarterly basis through the Department of Workforce Development. New employees must be reported to the Wisconsin new-hire directory (which Form WT-4 doubles as) within 20 days of the hire date.

How Take-Home Pay Works in Wisconsin

The calculation sequence runs from gross pay down to net pay. Because Wisconsin income tax begins with federal wages, the same pre-tax deductions that reduce federal wages also reduce the Wisconsin state base.

1. Start with gross wages for the pay period.
2. Subtract federal pre-tax deductions (401(k), Section 125 health premiums) to find taxable wages for federal and Wisconsin state tax.
3. Apply federal income tax withholding using the Form W-4 and IRS Publication 15-T.
4. Annualize wages, subtract the sliding standard deduction and $400 per WT-4 exemption, apply the graduated state schedule, and divide across pay periods.
5. Subtract Social Security (6.2%) and Medicare (1.45%) on FICA wages (gross less Section 125 medical). The remainder is net pay; there is no employee unemployment line and no local wage line.

To see exact figures for a specific salary, WT-4 status, and pay frequency, use the Wisconsin paycheck calculator or the general take-home pay calculator for a full pre-tax benefits stack.

Wisconsin Payroll Quick Facts (2026)

Frequently Asked Questions