Rex says
Wisconsin keeps this formula simple on paper — percentage times capped gross income — but the cap and add-ons are where real cases get complicated.
Try a scenario
Click to load — tweak from there.Inputs
Gross income before taxes
Result
Estimated monthly support (incl. health premium)
$850
Guideline percentage amount
$850
Guideline % applied (gross income)
17%
Gross income used (after cap)
$5,000
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How to use this
- 1Enter obligor's monthly gross income ($) — Gross income before taxes.
- 2Enter number of children in this case.
- 3Enter income ceiling before the court may deviate (editable) ($).
- 4Enter child's health insurance premium paid by obligor ($/mo).
- 5Enter existing court-ordered support for other children ($/mo).
- 6Read your estimated monthly support (incl. health premium) on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Estimates a guideline child support obligation in Wisconsin using that state's percentage-of-income standard model: the obligor's monthly gross income is capped at the statutory/editable cap, then multiplied by the guideline percentage for the number of children (1: 17%, 2: 25%, 3: 29%, 4: 31%, 5: 34%, 5+: same as 5). This is an estimate only, not legal advice — actual awards depend on the specific court, county guideline worksheets, and judicial discretion, and a judge may deviate from the guideline for good cause.
Worked example
Using the values the calculator loads with:
Inputs
- Obligor's monthly gross income: 5000 $
- Number of children in this case: 1
- Income ceiling before the court may deviate (editable): 999999 $
- Child's health insurance premium paid by obligor: 0 $/mo
- Existing court-ordered support for other children: 0 $/mo
Results
- Estimated monthly support (incl. health premium): $850
- Guideline percentage amount: $850
- Guideline % applied (gross income): 17%
- Gross income used (after cap): $5,000
What each field means
Inputs
- Obligor's monthly gross income ($)
- Gross income before taxes
- Number of children in this case
- The number of children in this case used in the calculation. Starts at 1 so you have a working example on load. Accepted range: 1–7.
- Income ceiling before the court may deviate (editable) ($)
- The income ceiling before the court may deviate (editable) used in the calculation, measured in $. Starts at 999999 $ so you have a working example on load.
- Child's health insurance premium paid by obligor ($/mo)
- The child's health insurance premium paid by obligor used in the calculation, measured in $/mo. Starts at 0 $/mo so you have a working example on load.
- Existing court-ordered support for other children ($/mo)
- The existing court-ordered support for other children used in the calculation, measured in $/mo. Starts at 0 $/mo so you have a working example on load.
Results
- Estimated monthly support (incl. health premium)
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Guideline percentage amount
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Guideline % applied (gross income)
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Gross income used (after cap)
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does Wisconsin calculate guideline child support?
Wisconsin uses a percentage-of-income standard: the obligor's monthly gross income, capped at the statutory/editable cap, is multiplied by a percentage that increases with the number of children (17/25/29/31/34%).
Wisconsin's percentage standard is applied to the payer's gross income alone (not combined with the other parent's)?
Wisconsin's percentage standard is applied to the payer's gross income alone (not combined with the other parent's), which is a key difference from income-shares states.
Does this include childcare or extraordinary medical costs?
Not automatically — this estimate covers the base guideline percentage plus the health insurance premium you enter. Courts in Wisconsin can add childcare, uninsured medical, and extracurricular costs on top of the guideline amount.
Is this figure binding on a Wisconsin court?
No. This is an estimate only, not legal advice — actual awards depend on the specific court, county guideline worksheets, and judicial discretion, and a judge may deviate from the guideline for good cause.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Wisconsin Child Support Calculator (percentage-of-income standard). Retrieved from https://www.revenuelab.fyi/toolbox/child-support-calculator-wisconsin
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/child-support-calculator-wisconsin" target="_blank" rel="noopener">Wisconsin Child Support Calculator (percentage-of-income standard) — RevenueLab</a> (2026).</p>
Source: [Wisconsin Child Support Calculator (percentage-of-income standard) — RevenueLab](https://www.revenuelab.fyi/toolbox/child-support-calculator-wisconsin) (2026).