The Wisconsin child support calculator applies a fixed percentage of the paying parent’s gross monthly income: 17% for one child, 25% for two, 29% for three, 31% for four, and 34% for five or more. The Wisconsin Department of Children and Families publishes free worksheets for every placement scenario on its website, and courts are required to use these percentages unless a party proves a deviation is warranted.1Wisconsin Department of Children and Families. Estimating Child Support Amounts Which worksheet fits your situation depends on how much time the child spends with each parent and whether either parent’s income falls outside the standard range.
What Counts as Income Before You Start
The calculator uses gross monthly income, not take-home pay. Under DCF 150.02(13), gross income includes wages, salaries, commissions, bonuses, and tips, together with interest, dividends, and other investment earnings. It also counts worker’s compensation, unemployment insurance, Social Security disability and retirement benefits, veterans disability compensation, military housing allowances, pension income, and undistributed income from a closely held corporation or partnership.2Wisconsin State Legislature. Wisconsin Administrative Code DCF 150.02 – Definitions
Income is counted before taxes, retirement contributions, and other payroll deductions. Voluntary deferred compensation and employee contributions to retirement accounts are specifically included, so maxing out a 401(k) will not reduce the obligation. Supplemental Security Income is generally not counted because it is a need-based benefit rather than earned or replacement income.
Before you run the numbers, pull together your most recent pay stubs, last year’s federal and state tax returns, documentation of any secondary income like disability benefits or rental income, the monthly cost of the child’s health insurance premium, and any recurring childcare expenses. Estimating these later is where most calculator results go wrong.
The Standard Percentage Calculation
When the paying parent has the child less than 25% of the time (fewer than 92 days per year), the calculation is simple: multiply gross monthly income by the percentage for the number of children.3Wisconsin State Legislature. Wisconsin Administrative Code DCF 150.035 – Determining the Child Support Obligation
- One child: 17%
- Two children: 25%
- Three children: 29%
- Four children: 31%
- Five or more children: 34%
A parent earning $5,000 per month in gross income with two children would owe $1,250 per month under the standard calculation. This is the base amount before any adjustment for health insurance, childcare, or variable costs.
If Placement Is Shared (92 Days or More)
When both parents have the child at least 25% of the time, Wisconsin switches to the shared-placement formula, which accounts for the fact that both households are spending money on the child.4Wisconsin State Legislature. Wisconsin Administrative Code DCF 150.035 – Shared Placement
The formula runs in steps. Each parent’s monthly gross income is multiplied by the percentage for the number of children. Each result is then multiplied by 150% to account for the duplicate household costs both parents carry, such as maintaining a bedroom and clothing at each home.5Wisconsin State Legislature. Wisconsin Administrative Code DCF 150.035 – Shared Placement Formula Each parent’s adjusted obligation is then multiplied by the proportion of time the child spends with the other parent. The two numbers are offset, and the parent who owes more pays the difference.
DCF publishes a shared-placement spreadsheet that walks through the math once you enter each parent’s income and the placement schedule.1Wisconsin Department of Children and Families. Estimating Child Support Amounts The result is still an estimate; the court has discretion over whether to apply the shared-placement formula and how to handle additional costs.
Split Placement and Multiple Families
Split placement applies when there are two or more children and each parent has primary placement of at least one of them. The court calculates each parent’s obligation for the children living with the other parent using a pro rata share of the standard percentage, then offsets the two figures so the parent who owes more pays the net difference.6Wisconsin State Legislature. Wisconsin Administrative Code DCF 150.04 – Determining Child Support for Split Placement
If you already owe support for children from an earlier relationship, you are a serial-family parent under DCF 150.04(1). The earlier obligation is calculated first using your full income, then subtracted from your income before the next obligation is calculated, so each later order is based on a reduced pool.7Wisconsin State Legislature. Wisconsin Administrative Code DCF 150 – Child Support Standard A new obligation for a later child cannot be used to reduce an existing order for earlier children.
High-Income and Low-Income Adjustments
The flat percentages are built for middle incomes. Wisconsin uses different formulas at both ends.
Payers Above $7,000 Per Month
When a paying parent’s monthly income reaches $7,000 ($84,000 annually), the court may apply a tiered formula that reduces the percentage on higher income brackets. The standard percentages apply to the first $7,000. Income between $7,000 and $12,500 is subject to lower rates, and income above $12,500 drops further.8Wisconsin Department of Children and Families. High-Income Payer Worksheet to Estimate Support A parent earning $15,000 per month with one child, for example, would owe 17% on the first $7,000, 14% on the next $5,500, and 10% on the remaining $2,500. The tiered formula is discretionary, so a court can still apply the standard percentage to the full income if the circumstances support it.
Payers Below the Poverty Line
Parents earning below 150% of the federal poverty guidelines may qualify for reduced amounts under a schedule in Appendix C of DCF 150. The percentage rises gradually as income moves from 75% to 150% of the poverty line.7Wisconsin State Legislature. Wisconsin Administrative Code DCF 150 – Child Support Standard Below 75% of the poverty guidelines, the court has discretion to set support at whatever amount fits the payer’s total economic circumstances, which can be less than the lowest number in the schedule. DCF updates these figures annually.
What If a Parent Is Not Working to Capacity?
If a parent is voluntarily unemployed or working well below their capacity without a good reason, the court does not accept that low income at face value. It can impute income based on what the parent could reasonably earn given their education, training, work history, physical and mental health, and the local job market.9Wisconsin Department of Children and Families. DCF 150 Imputation of Income
When no reliable information about actual earning ability is available, the court may impute income based on 10 to 35 hours of work per week at the higher of the federal or state minimum wage. That is a floor, not a ceiling. A parent with professional credentials and a long high-paying work history will usually have income imputed well above minimum wage.
Costs the Calculator Doesn’t Show
Health insurance for the child is a separate obligation added on top of the base support. Under DCF 150.05, the court assigns responsibility for enrolling the child in a plan and can require the other parent to contribute to the premium.10Wisconsin State Legislature. Wisconsin Administrative Code DCF 150.05 – Medical Support That contribution becomes an upward or downward adjustment to the order. If the receiving parent carries the insurance, the paying parent’s obligation goes up by their share of the premium. If the paying parent carries it, their obligation goes down by the other parent’s share.
Childcare costs needed for a parent to work or attend school are handled similarly. The court may also assign responsibility for unreimbursed medical expenses. Running the calculator without accounting for these items understates what the paying parent will actually transfer each month.
When the Court Will Depart From the Number
Either parent can ask the court to set support above or below the percentage result. The court weighs the child’s own financial resources, each parent’s financial situation, any maintenance payments, the standard of living the child would have enjoyed if the family had stayed together, childcare costs, and the desirability of having the custodial parent stay home with the child.11Wisconsin State Legislature. Wisconsin Statutes 767.511 – Child Support
Deviations are not automatic. The parent asking for one must prove by the greater weight of the evidence that applying the standard would be unfair to the child or to either parent. Courts do grant them, especially where there are unusual medical expenses, elderly dependents, or special needs the standard formula does not reach. A general objection to the amount will not succeed.
Turning the Estimate Into an Order
Calculator results are estimates until a judge or court commissioner approves them in the county where the family law case is pending. If both parents agree on the number, they can file a written stipulation with the clerk of court for approval. If they disagree, the court sets the amount after a hearing.
Wisconsin law requires every child support order to include immediate income withholding, whether or not the paying parent is behind. Once the order is signed, the employer must begin deducting support within the first pay period that falls five or more working days after receiving the withholding notice, and payments go to the Wisconsin Support Collections Trust Fund for distribution to the receiving parent.12Wisconsin Department of Children and Families. Income Withholding Information Self-employed parents arrange to pay the Trust Fund directly on schedule. A court can waive immediate withholding only if both parties agree in writing to an alternative or the court finds good cause to delay.