Understanding Wisconsin Child Support Laws and Guidelines
When parents separate or divorce, one of the most important issues to address is how their children will be financially supported. Wisconsin child support laws establish guidelines to help ensure that children receive financial support from both parents, regardless of whether their parents live together.
Whether you are establishing child support for the first time, reviewing an existing order, or requesting a modification, understanding Wisconsin’s child support guidelines can help you make informed decisions about your family’s financial future.
How Is Child Support Calculated in Wisconsin?
Wisconsin uses a Percentage of Income Standard under Chapter DCF 150 of the Wisconsin Administrative Code to determine child support obligations.
For cases that do not qualify for the shared-placement formula, the standard percentages generally are:
Number of Children | Percentage of Income |
|---|---|
1 child
| 17% |
2 children | 25% |
3 children | 29% |
4 children | 31% |
5 or more children | 34% |
These percentages generally apply to a parent’s monthly income available for child support, subject to applicable adjustments and special circumstances.
For example, if a parent earns $4,000 per month in income available for child support and the standard 17% calculation applies for one child, the estimated child support obligation would be $680 per month.
However, actual support orders can differ depending on placement arrangements, income, existing support obligations, and other factors.

How Does Shared Placement Affect Child Support?
Wisconsin child support calculations consider how much time children spend with each parent.
When both parents have court-ordered physical placement for at least 25% of the time, generally at least 92 days per year, and each is responsible for basic support costs during placement, the shared-placement formula may apply.
Under this formula, the court considers:
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Each parent’s income available for child support
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The percentage of time children spend with each parent
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The applicable child support percentage
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The additional costs of maintaining two households for the children
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Certain variable expenses associated with raising the children
Shared placement does not automatically eliminate child support. Even when parents divide placement equally, one parent may still owe support depending on the difference between their incomes.
What Income Is Considered for Wisconsin Child Support?
Wisconsin courts may consider several sources of income when determining child support, including:
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Wages and salaries
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Self-employment and business income
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Bonuses and commissions
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Rental and investment income
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Certain benefits and other forms of compensation
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A parent’s earning capacity in appropriate circumstances
The court may also consider whether a parent has existing legal obligations to support other children.
Because income can be calculated differently depending on employment arrangements and individual circumstances, accurate financial information is important.
Can Child Support Be Modified in Wisconsin?
Yes. Wisconsin law allows child support orders to be reviewed and modified under certain circumstances.
A parent generally must demonstrate a substantial change in circumstances to obtain a modification of an existing support order.
Situations that may justify reviewing a child support order include:
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A significant increase or decrease in income
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Job loss or changes in employment
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Changes in physical placement arrangements
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Changes in a child’s financial needs
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Certain changes in health insurance or other relevant expenses
Wisconsin law also establishes rebuttable presumptions of a substantial change in circumstances in certain situations, including the passage of 33 months since the last support order modification.
However, a modification is not automatic. The court must evaluate the applicable legal requirements and circumstances.
Parents should not assume that a verbal agreement or informal payment arrangement changes an existing court order.
What Happens if a Parent Does Not Pay Child Support?
Wisconsin has several methods for enforcing child support orders when payments are overdue.
Depending on the circumstances, enforcement measures may include:
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Income withholding from wages
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Interception of eligible tax refunds
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Suspension of certain licenses
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Liens against property
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Court enforcement proceedings
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Other remedies permitted under Wisconsin law
Parents experiencing financial difficulties should seek information about modifying their child support orders rather than simply stopping payments.
Unpaid child support may continue to accumulate as arrears even when a parent’s financial circumstances have changed.
Does Child Support Cover Medical Expenses?
Wisconsin child support orders may address medical support in addition to basic child support payments.
Depending on the circumstances, parents may be required to provide health insurance or contribute toward their children’s healthcare expenses.
Courts may also allocate responsibility for uninsured medical expenses and other costs not covered by ordinary child support payments.
The specific responsibilities depend on the support order and applicable Wisconsin law.
When Does Child Support End in Wisconsin?
In Wisconsin, child support generally continues until a child turns 18.
However, support may continue until age 19 if the child is still pursuing a high school diploma or its equivalent through a qualifying course of instruction.
Additional obligations, including unpaid child support arrears, may remain enforceable after the regular support obligation ends.
Parents should review their court orders before assuming that payments have ended.
Frequently Asked Questions About Wisconsin Child Support
Parents may propose an agreed amount, but the court must evaluate the agreement under Wisconsin law. A court is not automatically required to approve an amount that differs from the applicable guidelines.
No. Even with equal physical placement, child support may be required when parents have different incomes or other relevant circumstances.
Potentially. A significant, qualifying change in financial circumstances may support a modification request. The existing order generally remains enforceable unless it is legally changed.
Wisconsin’s child support guidelines generally begin with gross income or income available for support, rather than simply using a parent’s take-home pay.
Yes. Interstate child support enforcement laws provide procedures for enforcing qualifying support orders across state lines.
Speak With a Wisconsin Family Law Attorney
Child support decisions can have a lasting impact on your family’s financial stability. Whether you are going through a divorce, establishing support, or seeking to modify an existing order, understanding your rights and responsibilities is essential.
Gionis & Murtaugh Law Office, LLC, in St. Croix Falls, Wisconsin, provides legal services involving family law matters.
If you have questions about Wisconsin child support laws, child support calculations, or modifications, contact our office to discuss your situation.
Gionis & Murtaugh Law Office, LLC
303 Polk Parkway
St. Croix Falls, WI 54024
Phone: (715) 483-9818
Disclaimer: This article is intended for general informational purposes only and does not constitute legal advice. Child support determinations depend on individual circumstances and applicable Wisconsin law.

