What are the standard percentages?

Rates range from 17% for one child up to 34% for five or more children, under DCF 150.035, applying to the primary placement calculation where one parent has the child more than 75% of overnights.

What happens with shared physical placement?

When both parents have court-ordered placement of at least 25% of overnights (92 or more days per year), Wisconsin uses a separate shared-placement formula rather than the standard percentage.

How is child support enforced in Wisconsin?

Wage withholding starts immediately upon entry of a support order, sent directly to the employer without waiting for a delinquency, and employers must begin withholding within 5 working days. Wisconsin permits garnishment up to 65% of disposable earnings in some cases, among the most aggressive limits nationally.

Wisconsin, United States

Wisconsin Child Support: A Parent's Guide

Q: How is child support calculated in Wisconsin?

Using the Percentage of Income Standard under Wis. Admin. Code DCF 150, applying a fixed percentage of the paying parent's gross income based on the number of children, not a combined-income model like most other states use.

Q: Are there different rules for high earners?

Yes. Where a paying parent earns over $84,000 per year ($7,000/month), the law allows lower percentages to apply to income above that threshold, known as the 'high-income payer guidelines.'

How child support works in Wisconsin, in plain English: the Percentage of Income Standard, modification, and aggressive wage withholding.

Legal sources reviewed: August 10, 2026

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In short: Wisconsin uses a distinctive Percentage of Income Standard, applying a fixed rate to the paying parent's own gross income rather than combining both parents' incomes. Placement percentage matters directly: over 75% primary placement uses the standard rate, 25%+ shared placement triggers a different formula, and enforcement allows garnishment up to 65% of disposable earnings.

This is an educational overview written for parents, not lawyers. It isn't legal advice. For anything beyond general understanding, talk to a licensed Wisconsin family law attorney.

What Wisconsin generally provides

Under Wis. Admin. Code DCF 150, Wisconsin calculates child support using the Percentage of Income Standard, a fixed percentage of the paying parent's gross income, based on the number of children, distinct from the income-shares model most states use.

Important terminology

Percentage of Income Standard: Wisconsin's calculation method, applying a set percentage to the paying parent's own gross income rather than combined parental income.
Primary placement: where one parent has the child more than 75% of overnights, triggering the standard percentage rates.
Shared placement formula: the alternative calculation used once both parents have at least 25% of overnights (92+ days/year).

How the calculation works

A percentage of one parent's income, not combined income

Wisconsin's standard percentages run from 17% for one child up to 34% for five or more children, applied directly to the paying parent's gross income under the primary placement calculation, used where one parent has the child for more than 75% of overnights.

Shared placement changes the formula

Once both parents have court-ordered placement of at least 25% of overnights (92 or more days per year), Wisconsin switches to a shared placement formula rather than applying the standard percentage directly, reflecting that both households are covering the child's day-to-day costs during their own time.

High-income payer guidelines

Where a paying parent earns over $84,000/year ($7,000/month), the law allows lower percentages to apply to income above that threshold, the so-called high-income payer guidelines, recognizing that a flat percentage applied without limit could produce disproportionate amounts at high incomes.

Requesting or defending a modification

Wisconsin requires a substantial change in circumstances to modify support, generally defined as either a 15% or greater difference from the current order with a minimum $50 monthly change, or the passage of 33 months since the last order. Courts cannot modify past-due support, only future payments based on changed circumstances. See the child support calculator and guideline finder for jurisdiction-specific calculation sources and guidance.

How enforcement works

Wage withholding is immediate upon entry of a Wisconsin support order, the court sends an Income Withholding Order directly to the employer without waiting for a delinquency first. Employers must begin withholding within 5 working days. Wisconsin permits garnishment of up to 65% of disposable earnings, among the most aggressive limits nationally: a parent already supporting another spouse or child faces a maximum of 50%, a parent without other support obligations faces up to 60%, and an additional 5% can apply where arrears exceed 12 weeks. Interest accrues on arrears at 0.5% per month once an arrears judgment is entered.

Common questions

Does 50/50 custody mean the standard percentage applies? No, once both parents have at least 25% of overnights, Wisconsin uses the separate shared-placement formula rather than the standard percentage-of-income calculation.

Can I be garnished more than 50% of my paycheck? Potentially, yes, Wisconsin's limits go up to 65% depending on whether you support another spouse or child and whether arrears exceed 12 weeks, higher than many states allow.

What if my co-parent isn't paying? Wisconsin's withholding starts automatically with the order itself in most cases, so nonpayment despite an active order is worth raising promptly with your county child support agency.

Practical considerations

Because Wisconsin's calculation depends heavily on the specific overnight percentage (the 75% and 25% thresholds determine which formula applies), track your actual placement schedule carefully, a modest shift in overnights can change which calculation method applies entirely. For the custody and placement rules underlying these thresholds, see the Wisconsin custody guide.

Official Wisconsin resources

FAQ

Questions, answered

This information is provided for educational purposes only and is not legal advice. Family law varies by individual circumstances and may change over time. Consult a qualified attorney or appropriate official resource for advice about your situation.