Wisconsin Child Support Calculator
Free Wisconsin child support calculator using the percentage model. Estimate monthly payments based on both parents' income and custody schedule.
How This Calculator Works
Calculation methodology and assumptions
Wisconsin uses the percentage model for calculating child support. A flat percentage of the non-custodial parent's income is applied based on the number of children. This model focuses solely on the paying parent's income. This calculator provides an estimate — actual court orders may vary based on additional factors like extraordinary medical costs, educational expenses, and judicial discretion.
Key State Information
Wisconsin uses the percentage model. Wisconsin's progressive income tax (up to 7.65%) is factored into disposable income calculations. The median household income in Wisconsin is $67,125.
How to Use This Child Support Calculator
- 1
Enter both parents' incomes
Input the gross monthly income for each parent. Child Support Calculator use either an income shares model (combining both incomes) or a percentage-of-income model to calculate support.
- 2
Enter the number of children
The number and ages of children affect the support amount. More children generally means a higher total obligation, but the per-child amount decreases slightly.
- 3
Adjust for custody arrangement
If the non-custodial parent has significant parenting time (e.g., 30%+ overnights), many states reduce the support amount to reflect shared expenses.
- 4
Review the estimated payment
The result is an estimate based on the state's guidelines. Actual court-ordered amounts may vary based on extraordinary expenses, healthcare costs, and judicial discretion.
Example Calculation
How is child support calculated in Child Support Calculator?
For two parents with gross monthly incomes of $5,000 and $3,000 and two children: In an income shares model, the combined income of $8,000 is looked up in the state's schedule to determine total child support obligation (e.g., $1,400/month). Each parent's share is proportional to their income — the higher earner pays 62.5% ($875) and the lower earner pays 37.5% ($525). The non-custodial parent typically pays their share to the custodial parent.
Result: Child support obligations vary dramatically by state. For this same scenario, obligations might range from $600/month in some states to $1,200+/month in others. Always use state-specific guidelines for accurate estimates.
What Affects Your Results
State Model
Child Support Calculator use either income shares (39 states), percentage of income (6 states), or the Melson formula (3 states). The model dramatically affects results at different income levels.
Combined Parental Income
Higher combined income means higher total obligation, but the percentage of income devoted to support decreases at higher levels. Most guidelines have income caps.
Number of Children
Support increases with more children but not linearly. Two children might cost 1.5x one child rather than 2x, reflecting economies of scale.
Custody Arrangement
Shared or joint custody (significant time with both parents) reduces the transfer payment since both parents directly fund the child's expenses during their parenting time.
Tips for Child Support Calculator Residents
- Child support is calculated on gross income, not net. This includes salary, bonuses, commissions, self-employment income, and sometimes investment income.
- Child Support Calculator allow deviations from guidelines for extraordinary medical expenses, special education needs, or travel costs for long-distance visitation.
- Child support is not tax-deductible for the payer nor taxable income for the recipient (since 2019 Tax Cuts and Jobs Act).
- Modifications can be requested when there's a significant change in circumstances — job loss, income increase, remarriage, or change in custody. Most states allow modification if income changes by 10–20%.
- If self-employed, courts may "impute" income based on your earning capacity if they believe you're underreporting. Keep thorough financial records.
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StateCalc Team
Editorial Team
The StateCalc team builds free financial calculators using data from official government sources including the IRS, U.S. Census Bureau, BLS, and state revenue departments. All formulas are validated by an automated test suite and cross-referenced against published data.
Our editorial standardsFrequently Asked Questions
How is child support calculated in Wisconsin?
Wisconsin uses the percentage model. Child support is calculated as a percentage of the non-custodial parent's net income: 20% for 1 child, 25% for 2, 30% for 3, 35% for 4, and 40% for 5+. Courts may deviate based on special circumstances.
How long does child support last in Wisconsin?
In most cases, child support in Wisconsin continues until the child turns 18 or graduates high school (whichever is later). Some states extend support to age 19 or through college in certain circumstances.
Can child support be modified in Wisconsin?
Yes, either parent can request a child support modification if there's a substantial change in circumstances — such as a significant income change (usually 15-20% or more), job loss, disability, or change in custody arrangement.
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