Wisconsin Shared and Split Placement Child Support Calculator

When some children share time between both homes and others live primarily with one parent, Wisconsin combines two formulas in one case: shared placement math for the shared children and split placement math for the rest.^[1] Each parent's two portions add together, the totals offset, and one payment results. Enter both incomes, each child's placement, and the shared children's overnights below, and the calculator builds both portions and shows the whole thing.

This is the most fact-sensitive calculation in Wisconsin's system, and the one where a clean-looking number deserves the least trust. Courts blend these provisions at their discretion, small classification calls move real dollars, and almost nobody's case matches the textbook version. Treat the result as the start of an attorney conversation, not the end of one.

Please read before you start. This is an estimate, not a court order. It runs the shared-placement formula in Wis. Admin. Code § DCF 150.035(1) and the split-placement provisions in § DCF 150.04(3) against the figures you enter, then nets the two sides. Combined cases are the most fact-dependent in Wisconsin's system, and courts may layer the serial-family, high-income, or low-income provisions on top when the criteria fit. Under Wis. Stat. § 767.511(1m) a court can order a different amount. Using this tool does not create an attorney-client relationship with Sterling Lawyers and nothing here is legal advice.

Built on the combined provisions in Wis. Admin. Code DCF 150.04(6) and checked against the state's official combined split-placement and shared-placement worksheet.^[2]

Is this the right calculator for you?

Use it when at least one child has a shared schedule with 92 or more overnights at each home, and at least one other child lives primarily with one parent, all in the same case. If every child fits one structure, use that structure's tool instead.

• Every child is shared. One formula covers the whole case through the shared placement child support calculator.
• Every child lives primarily with one parent, and each parent has at least one. That is straight split placement, handled by the split placement child support calculator.
• One parent has primary placement of all the children. The standard percentages cover it, through the main Wisconsin child support calculator.
• Earlier support orders, or income unusually high or low. Those provisions can stack onto this blend too. The calculator preserves the flags, and stacked combined cases are exactly where attorney review stops being optional.

How the combined formula works

Two engines run in one case, and every child goes through exactly one of them based on that child's placement.

1. Set the per-child rate from the whole family. Take the designated percentage for the total number of children and divide by that total: 12.5 percent per child for two, 9.67 for three, 7.75 for four, 6.8 for five.^[3] Every child's slice uses this rate, whichever engine it runs through.
2. Build the split portion. For the primarily placed children, each parent owes their income times the per-child rate times the number of those children living with the other parent. No multiplier applies on this side.
3. Build the shared portion. For the shared children, each parent's income times the per-child rate for those children runs through the shared machinery: times 150 percent, times the other parent's share of the shared children's overnights.^[4]
4. Add each parent's two portions. A parent can owe on one side and effectively receive on the other; the totals capture both.
5. Offset. The parent with the larger combined total pays the difference, and the calculator shows a comparison against the straight percentage amount, mirroring the official worksheet.

A worked example

Parent A earns $3,800 a month; two children live primarily with A, and one child is shared, spending 200 overnights with A. Parent B earns $5,200 a month, with 165 shared overnights. Three children total means 29 percent, so the per-child rate is 9.67 percent.

• Split portion: Parent B owes on the two children with Parent A: $5,200 x 19.34% = $1,006. Parent A owes on zero children living with B: $0.
• Shared portion, Parent A: $3,800 x 9.67% = $367, times 150% = $551, times 45.2% (B's 165 nights of 365) = $249.
• Shared portion, Parent B: $5,200 x 9.67% = $503, times 150% = $754, times 54.8% (A's 200 nights of 365) = $413.
• Totals and offset: Parent A: $249. Parent B: $1,006 + $413 = $1,419. Parent B pays about $1,170 per month.

Notice what the blend did. Parent A owes nothing on the split side and still built a $249 shared-side figure that nets against Parent B's total. Both engines matter to the final number, which is why classifying even one child differently reshapes the whole result.

The classification calls that move the money

Which engine each child runs through is the whole ballgame. A child at 92 court-ordered overnights with each parent is shared; at 91, primarily placed, and that child's slice reroutes through completely different math. Court-ordered equivalent care credits can push a borderline child across the line.

The other lever is the total. Because the per-child rate divides the designated percentage for all the children by all the children, adding or reclassifying one child changes every child's rate, not just their own. In mixed cases, no input is small.

Variable costs carry real weight here

In combined cases, the code does not leave variable costs to chance. On top of the support figure, the court assigns responsibility for the children's variable costs, such as child care, tuition, and special needs, in proportion to each parent's share of placement, with income disparity considered. Those payments run between the parents or straight to the provider.

Budget for both layers. The offset payment above is the floor of the financial picture, not the whole of it.

What this estimate leaves out

More rides outside this number than on any other page in this system.

• The court's discretion. The blend itself is optional with the court, and so is every special provision stacked onto it.
• Classification fights. Overnight counts and per-child placement labels get litigated, and this estimate assumes yours are settled.
• The variable cost order and medical support. Both get assigned separately, and in combined cases the variable cost assignment is a required piece of the order.
• The order itself. Deviations run in either direction on request with written findings,^[5] and only a court sets, approves, or changes support.

How Sterling Lawyers can help

We will be direct: do not settle a mixed-placement case on a calculator number, ours included. The combined formula rewards preparation more than any other in Wisconsin, because classification, counting, and stacking decisions all move the payment, and most of them are arguable. Sterling Lawyers practices family law exclusively across Wisconsin, and mixed-placement support is precisely the work our attorneys do.

Bring the estimate. We will tell you which inputs are solid, which are fights worth having, and what the realistic range looks like, before anyone signs anything.

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