Wisconsin uses the Percentage of Income model to calculate child support, which means child support is calculated as a flat percentage of the non-custodial parent's income.
Under the Percentage of Income model, child support is calculated as a percentage of the non-custodial parent's income (gross or net, depending on the state). The custodial parent's income is generally not considered. Typical percentages are around 20% for one child, 25% for two children, 30% for three, and so on. This means every dollar of hidden income directly reduces child support.
The Wisconsin child support guidelines provide specific tables and formulas that courts use to determine the appropriate amount. Judges can deviate from these guidelines in special circumstances, but the calculated amount is the presumptive starting point.
For the official guidelines, visit the Wisconsin child support guidelines.
Income for child support typically includes wages, salary, bonuses, commissions, self-employment income, rental income, investment returns, retirement payments, Social Security benefits, disability payments, and trust distributions.
Importantly, courts in Wisconsin can look beyond what appears on a tax return. If a parent is self-employed or owns a business, the court can examine business records, bank statements, and lifestyle evidence to determine true income. Personal expenses paid by a business, unreported cash income, and excessive business deductions can all be added back as income for child support purposes.
Read our complete guide to what counts as income →
In Wisconsin, you can request a modification of child support when there has been a material change in circumstances. This typically includes:
To file a modification in Wisconsin:
The Wisconsin Bureau of Child Support can help with modification requests. Visit their website at Wisconsin Bureau of Child Support.
Read our step-by-step modification guide →
Official Wisconsin child support calculation guidelines and tables.
State agency that handles child support enforcement and services.
Search Wisconsin business registrations and filings.
Learn what evidence Wisconsin courts accept for proving hidden income.
Find business filings and property records that may reveal hidden income.
This information is for educational purposes only and is not legal advice. Child support laws in Wisconsin may change. Consult a licensed Wisconsin attorney for advice specific to your situation.