Start with Wis. Stat. § 767.511; Wis. Admin. Code DCF 150. In Wisconsin, Wisconsin uses the Percentage of income (percentage standard) and measures income as gross income. Wisconsin’s percentage standard applies set percentages of the payer’s monthly income available for child support (17% for one child, 25% for two, 29% for three, 31% for four, 34% for five or more). Shared-placement formulas under DCF 150 adjust the percentages when both parents have significant overnights. That is the question this guide answers for how child support is calculated. Support generally ends when Support generally continues until 18, or 19 if still in high school. Modification: Substantial change in circumstances; income and placement changes commonly support revision.
Statutory framework and guideline model
Wisconsin's child support system is built around Wis. Stat. § 767.511; Wis. Admin. Code DCF 150. Under the percentage of income (percentage standard), Wisconsin’s percentage standard applies set percentages of the payer’s monthly income available for child support (17% for one child, 25% for two, 29% for three, 31% for four, 34% for five or more). Shared-placement formulas under DCF 150 adjust the percentages when both parents have significant overnights.
Federal law requires every state to maintain presumptive guidelines and to review them at least every four years (42 U.S.C. § 667). Confirm the latest Wisconsin schedule or worksheet before relying on any online calculator.
How child support is calculated in Wisconsin
- Identify each parent's guideline income using gross income as defined in Wis. Stat. § 767.511; Wis. Admin. Code DCF 150 and the accompanying worksheets or administrative rules.
- Apply the percentage of income (percentage standard) — whether that means a combined-income schedule, an obligor percentage table, or a Melson-style self-support reserve plus primary obligation.
- Allocate add-ons such as health insurance premiums, unreimbursed medical expenses, and work-related child care according to Wisconsin practice.
- Consider parenting time adjustments where the guidelines or case law authorize a credit or shared-custody formula.
- Test for deviation if a strict guideline result would be unjust or inappropriate on the record.
Online calculators can illustrate ranges, but only the controlling statute, guidelines, and court findings produce an enforceable order.
How the Wisconsin rule applies
Apply the Wisconsin authorities in order. The facts are simplified so the statute and the standard are visible.
Two parents in Wisconsin need a presumptive child-support figure and may have facts that justify a departure.
- Measure guideline income as gross income under Wis. Stat. § 767.511; Wis. Admin. Code DCF 150.
- Apply the Percentage of income (percentage standard): Wisconsin’s percentage standard applies set percentages of the payer’s monthly income available for child support (17% for one child, 25% for two, 29% for three, 31% for four, 34% for five or more). Shared-placement formulas under DCF 150 adjust the percentages when both parents have significant overnights.
- Test deviation: Courts may modify the percentage standard when it is unfair to the child or either party under statutory factors.
- If circumstances later change: Substantial change in circumstances; income and placement changes commonly support revision.
The enforceable number is the Wisconsin guideline result under Wis. Stat. § 767.511; Wis. Admin. Code DCF 150, plus any deviation findings. County child support agencies enforce with income withholding, intercepts, and contempt.
Deviation from the guidelines
Courts may modify the percentage standard when it is unfair to the child or either party under statutory factors.
When a court departs from the presumptive amount, Wisconsin practice generally requires findings that explain why the guideline figure is unjust or inappropriate and what amount better serves the child's needs. Those findings matter on appeal and in later modification proceedings.
Modification of child support
Substantial change in circumstances; income and placement changes commonly support revision.
A parent seeking a change typically must show that circumstances after the prior order make the existing award inequitable. Common triggers include job loss, substantial income changes, a new parenting-time schedule, emancipation of a child, or extraordinary medical needs. Retroactivity and temporary relief rules are statute-specific — check Wis. Stat. § 767.511; Wis. Admin. Code DCF 150 and local family-division procedures.
Enforcement in Wisconsin
County child support agencies enforce with income withholding, intercepts, and contempt.
Interstate cases often implicate UIFSA. Income withholding, contempt, license suspension, and tax-refund intercept remain core tools nationwide, but the Wisconsin child support agency and clerk of court procedures control day-to-day collection.
When child support ends
In Wisconsin, Support generally continues until 18, or 19 if still in high school. Orders may extend for disability, secondary education, or other statutory grounds where the statute allows. Always read the judgment language — agreed orders sometimes set a different end date or require a notice of emancipation.
Case law: how Wisconsin courts apply the guidelines
The opinions below are in the LawDiver corpus. Each block quote is taken from the opinion text so you can jump from this guide into the full decision.
In RE the MARRIAGE OF: John G. THIBADEAU, Petitioner-Respondent, v. Diane M. THIBADEAU, Respondent-Appellant
…, P.J. Diane Thibadeau appeals from an order increasing her child support payments for those of her children living with her former husband John. We reverse because the substantial or material change in circumstances required for a modification of child support has not been shown. First, we hold that evidence of minor children's increased age, absent a showing of increased expe…
Practitioners open In RE the MARRIAGE OF: John G. THIBADEAU, Petitioner-Respondent, v. Diane M. THIBADEAU, Respondent-Appellant when Wisconsin child support turns on the distinction in this sentence: "P.J. Diane Thibadeau appeals from an order increasing her child support payments for those of her children living with her former husband John. We reverse because the substantial or material change in circumstances required for a modification of child support has not been shown." Do not lift it out of the facts the court was deciding.
In Re the Marriage Of: Michael A. Luciani, Petitioner-Appellant, v. Angelina Montemurro-Luciani
…come tax exemption provision as well as the circuit court's child support award based on the statutory percentage guideline standards requiring Luciani to pay 24% of his income to Dr. Montemurro for support for the parties' two minor children. Id. at 72-73. The issue we consider on review is whether the circuit court erroneously exercised its discretion when it did not deviate…
Practitioners open In Re the Marriage Of: Michael A. Luciani, Petitioner-Appellant, v. Angelina Montemurro-Luciani when Wisconsin child support turns on the distinction in this sentence: "Luciani to pay 24% of his income to Dr. Montemurro for support for the parties' two minor children. Id. at 72-73." Do not lift it out of the facts the court was deciding.
In RE the MARRIAGE OF: Richard L. LANGLOIS, Petitioner-Appellant, v. Kathleen E. LANGLOIS, Respondent
…eals from a trial court order denying his motions to modify child support and to vacate a seek-work order. Richard's sole financial resource is Supplemental Security Income (SSI), received pursuant to Title XVI of the Social Security Act, 42 U.S.C. secs. 1381-1383c. The court continued an order allocating 25% of Richard's SSI benefits for child support purposes. We hold that su…
Wisconsin opinions such as In RE the MARRIAGE OF: Richard L. LANGLOIS, Petitioner-Appellant, v. Kathleen E. LANGLOIS, Respondent are cited where child support is disputed. The court stated: "Richard's sole financial resource is Supplemental Security Income (SSI), received pursuant to Title XVI of the Social Security Act, 42 U.S.C. secs. 1381-1383c. The court continued an order allocating 25% of Richard's SSI benefits for child support purposes." That is the language to brief; the rest of the decision supplies the procedural posture.
In Re the Marriage Of: Amy Rumpff, A/K/A Amy Forkins, Joint-Petitioner-Respondent, v. Timothy Earl Rumpff
…¶ 1. Timothy Earl Rumpff appeals the property division and child support award associated with a judgment of divorce. He argues that the trial court misinterpreted or misapplied child support regulations, erroneously valued retirement assets, and failed to properly consider contributions Timothy made to the marital residence. Timothy asserts that the trial court erroneously ex…
Wisconsin opinions such as In Re the Marriage Of: Amy Rumpff, A/K/A Amy Forkins, Joint-Petitioner-Respondent, v. Timothy Earl Rumpff are cited where child support is disputed. The court stated: "Timothy Earl Rumpff appeals the property division and child support award associated with a judgment of divorce." That is the language to brief; the rest of the decision supplies the procedural posture.
In Re the Marriage Of: Janet L. Drier, Petitioner, and Joseph P. Drier, Respondent, Sauk County Child Support
BABLITCH, J. The Sauk County Child Support Agency (agency) appeals from that portion of a divorce judgment holding open an award of child support for the parties’ three minor children, and ordering the husband to pay the monthly mortgage payments, taxes and insurance on the parties’ homestead.1 As a result of the order, *315the agency is presently…
Practitioners open In Re the Marriage Of: Janet L. Drier, Petitioner, and Joseph P. Drier, Respondent, Sauk County Child Support when Wisconsin child support turns on the distinction in this sentence: "The Sauk County Child Support Agency (agency) appeals from that portion of a divorce judgment holding open an award of child support for the parties’ three minor children, and ordering the husband to pay the monthly mortgage payments, taxes and insurance on the parties’ homestead." Do not lift it out of the facts the court was deciding.
In Re the Marriage Of: Kathleen A. Grohmann, Petitioner-Appellant, v. Thomas C. Grohmann, Respondent-Respondent
…in concluding that it had no authority to order payment of child support by a trust pursuant to sec. 7Q1.06(4)(b) and (6), Stats., and (2) whether the trial court should have included undistributed trust income as part of the support payer's gross income for purposes of applying *693 the support guidelines in Wis. Adm. Code ch. HSS 80. We conclude that the trial court had no a…
Wisconsin opinions such as In Re the Marriage Of: Kathleen A. Grohmann, Petitioner-Appellant, v. Thomas C. Grohmann, Respondent-Respondent are cited where child support is disputed. The court stated: "Q1.06(4)(b) and (6), Stats., and (2) whether the trial court should have included undistributed trust income as part of the support payer's gross income for purposes of applying *693 the support guidelines in Wis. Adm. Code ch. HSS 80." That is the language to brief; the rest of the decision supplies the procedural posture.
In RE MARRIAGE OF JARMAN v. Welter
In RE MARRIAGE OF JARMAN v. Welter, 2006 WI App 54 (2006)
…MAN f/k/a Carolyn Rae Welter, Petitioner, EAU CLAIRE COUNTY CHILD SUPPORT AGENCY, Appellant, v. Larry Howard WELTER, Respondent-Respondent. No. 2005AP1616. Court of Appeals of Wisconsin. Submitted on briefs February 6, 2006. Decided February 14, 2006. On behalf of the appellant, the cause was submitted on the brief of Timothy J. Sullivan, Eau Claire County Assistant Corporation…
Wisconsin opinions such as In RE MARRIAGE OF JARMAN v. Welter are cited where child support is disputed. The court stated: "MAN f/k/a Carolyn Rae Welter, Petitioner, EAU CLAIRE COUNTY CHILD SUPPORT AGENCY, Appellant, v. Larry Howard WELTER, Respondent-Respondent. No. 2005AP1616. Court of Appeals of Wisconsin. Submitted on briefs February 6, 2006. Decided February 14, 2006." That is the language to brief; the rest of the decision supplies the procedural posture.
Practical checklist for Wisconsin child support matters
- Gather recent pay stubs, tax returns, and proof of health insurance / child-care costs.
- Complete the current Wisconsin worksheet or financial affidavit required by the local court.
- Document parenting-time overnights if a shared-custody adjustment may apply.
- Flag facts that could support deviation (special needs, travel costs, high income, other children).
- Search LawDiver for recent Wisconsin appellate decisions before mediation or trial.
Key takeaways
- Wisconsin follows the Percentage of income (percentage standard) model for presumptive child support.
- Income is generally measured using gross income, then allocated under Wis. Stat. § 767.511; Wis. Admin. Code DCF 150.
- Guideline amounts are presumptive, not automatic — courts may deviate when the facts justify it.
- Support generally continues until 18, or 19 if still in high school.
- Either parent can seek modification when substantial change in circumstances; income and placement changes commonly support revision..
- Read the companion guide: Wisconsin alimony / maintenance.
Frequently asked questions
How is child support calculated in Wisconsin?
Wisconsin uses the percentage of income (percentage standard) under Wis. Stat. § 767.511; Wis. Admin. Code DCF 150. Courts start with gross income, apply the guideline schedule or percentage, allocate add-ons, and may deviate with findings when the presumptive amount is unjust.
What income counts for Wisconsin child support?
Guideline income generally tracks gross income as defined by Wis. Stat. § 767.511; Wis. Admin. Code DCF 150 and the worksheets. Wages, self-employment income, bonuses, and certain benefits are commonly included; exact deductions and exclusions are statute-specific.
Can Wisconsin courts order more or less than the guideline amount?
Yes. Guideline support is presumptive. Judges may deviate when the record shows the guideline result is unjust or inappropriate, typically with written findings explaining the departure.
How do I modify a Wisconsin child support order?
Substantial change in circumstances; income and placement changes commonly support revision. File in the court with continuing jurisdiction (or follow UIFSA for interstate cases) and support the request with current financial evidence.
When does child support end in Wisconsin?
Support generally continues until 18, or 19 if still in high school. Confirm any disability, educational, or agreed extensions in your particular order.
Where can I research Wisconsin child support case law?
Use LawDiver search scoped to Wisconsin, or open the opinions linked in this guide. Companion reading: Wisconsin maintenance guide.
Disclaimer
This guide is general legal information about Wisconsin child support, not legal advice. Statutes, guidelines, and case law change. Confirm the current text of Wis. Stat. § 767.511; Wis. Admin. Code DCF 150 and consult a licensed Wisconsin family-law attorney about your facts.