Michigan Child Support Calculator

At $6,000 per month in combined monthly net income, Michigan's guidelines produce roughly $409/month for 1 child, $552/month for 2 children, $589/month for 3 children, $627/month for 4 children. These figures come from running Michigan's own guideline formula, but they hold several things constant -- assumes the higher earner has 65% of the combined income shown, no add-ons, and a 300/65 overnight split. Your actual number depends on both parents' incomes, your parenting-time schedule, and add-on costs like childcare and health insurance, so run the calculator for your own case.

Michigan uses the Income Shares model. Michigan applies the Michigan Child Support Formula's General Care Equation, a piecewise formula over both parents' net income, then applies the Parental Time Offset -- an exponential adjustment based on the overnight split that scales continuously, with no minimum-overnight threshold.

Michigan's guideline runs on net income (both parents). That distinction matters: entering gross income into a formula built on net income (or the reverse) produces a materially wrong figure. Most states count income from essentially any regular source -- wages, self-employment, bonuses, commissions, rental and investment income, and many benefits -- not just salary.

Not necessarily. In Michigan: exponential formula (MCSF 3.03(A)(2)) — no fixed overnight threshold, unlike some other states. Because the guideline also weighs each parent's share of income, a significantly higher earner can still owe support at an even time split.

This calculator's core formula has been verified against the primary source, with any unimplemented rules listed openly rather than hidden. It implements the guideline in effect as of 2025-01-01, and a human last checked it against the primary source on 2026-08-12. Sources: 2025 Michigan Child Support Formula Manual; January 2025 Michigan Child Support Formula Supplement. It is still an estimate, not a court order -- a judge can order a different amount, and this is not legal advice.

The Michigan guideline this calculator implements took legal effect on 2025-01-01. States revise their guidelines periodically -- federal rules require each state to review its guidelines at least once every four years -- so a figure from an older calculator or article may reflect a superseded rule.

The two-parent interaction case (both incomes above the Low Income Threshold, both time-shares nonzero) is verified against the formula as transcribed, but not independently cross-checked against a two-axis published table cell -- the published tables are dense enough that eyeballing a specific cell risked a transcription error rather than a genuine verification. Does not collect inputs for additional children from other relationships (MCSF 2.08(B) Adjustment Multiplier table) or low-income-producing-assets/potential-income (MCSF 2.01(G), 2.06). Health care premium and child care proration (MCSF 3.05(C), 3.06(C)) is implemented per the manual's described steps but not cross-checked against a worked example in the manual. If any of these apply to your case, treat the estimate as a starting point and confirm the figure with an attorney, a mediator, or Michigan's official worksheet.

Yes. The figure produced by Michigan's Income Shares guideline is presumptive, not mandatory: a court can order a different amount when applying the guideline would be unjust or inappropriate for the specific case, and generally must state its reason on the record. Common grounds include extraordinary medical or educational expenses, a child's special needs, or costs the formula does not capture. Michigan's guideline is set out in 2025 Michigan Child Support Formula Manual.

You have to file for a modification -- a change in your circumstances does not change what you owe on its own. Michigan, like most states, requires a substantial change in circumstances: a significant involuntary income change, a change in the parenting schedule, or a material change in the child's needs. Until a court or the state child support agency issues a new order, the existing amount stays fully enforceable and arrears keep accruing, and a modification is generally not applied retroactively before the date you filed -- so filing promptly matters.