By Stacy J. Schlemmer, Partner & Family Law Attorney, Peterson, Berk & Cross, S.C.
One of the most common misconceptions in Wisconsin family law is that equal shared placement (50/50) automatically cancels out child support. In reality, Wisconsin uses a “Shared-Payer” formula that considers both parents’ incomes when parents have shared placement. If there is a significant earnings gap, the higher-earning parent will likely still pay support, even if the kids spend exactly one-half of their time at each house.
At Peterson, Berk & Cross, S.C., we frequently meet with parents who are surprised to learn that their “perfectly equal” schedule doesn’t result in a $0 support order. Wisconsin’s child support system is designed to ensure that a child’s standard of living remains relatively consistent between both households.
The “Shared-Payer” Formula (DCF 150)
In Wisconsin, “Shared Placement” applies when both parents have the child(ren) for at least 25% of the time (92 overnights per year). Once you hit this threshold, the Court moves away from the simple “percentage of income” model and uses a more complex calculation:
- Step 1: The court determines what each parent would pay the other if the other parent had full custody (e.g., 17% of gross income for one child).
- Step 2: Each amount is multiplied by 150% (this “multiplier” accounts for the extra costs of maintaining two full households for the children).
- Step 3: These numbers are then weighted by the percentage of time each parent has the children.
- Step 4: The two amounts are offset against each other. The parent with the higher remaining obligation pays the difference to the other parent.
What Counts as “Income” in 2026?
Wisconsin law is incredibly broad when defining “gross income” for support. It’s not just your base salary. It also includes:
- Bonuses, commissions, and overtime.
- Interest, dividends, and investment income.
- Worker’s compensation and unemployment benefits.
An important consideration with child support is the concept of imputed income. Under Wisconsin law, if a parent is voluntarily unemployed or underemployed, the court can “impute” income based on their earning capacity, prior work history, and the local job market.
The “Variable Costs” Factor
Child support is intended to cover “basic” costs: food, shelter, and clothing. But what about the other expenses? In shared placement cases, Wisconsin courts will also require parents to split variable costs in proportion to their placement time. These include things like:
- Daycare and after-school programs.
- Tuition and school fees.
- Sports, music lessons, and summer camps.
- Extra-curriculars, sports equipment and uniforms.
We highly recommend a “Variable Cost Reconciliation” clause in your agreement. This requires parents to exchange receipts on a regular basis so that the parent who spent more on the kids’ activities is reimbursed correctly—and timely–by the other. One of our family law attorneys can help provide limited scope representation reviewing language to include in your Stipulations and Agreements.
Health Insurance and “Reasonable Cost”
As of 2026, Wisconsin’s medical insurance support rules have been refined. If a parent can access health insurance for the child at a “reasonable cost” (generally defined as 10% or less of their gross income), they are typically required to provide it. The cost of that additional cost of insurance coverage for the child(ren) is then factored into the overall support calculation to ensure it is shared fairly.
Uninsured medical, dental, vision and mental health costs for the child(ren) will be split equally except for extremely rare situations, regardless of placement schedule.
Is Your Support Order Fair?
Child support is never just a “plug and play” numbers game. From high-income earners who may be subject to different percentage tiers to self-employed parents with complex tax returns, the details matter. Don’t rely on an online calculator to plan your future. If you are navigating a child support modification case in the Fox Valley or beyond, call Peterson, Berk & Cross, S.C. at (920) 831-0300. We’ll make sure the math works for you and your children.