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State Guide · Michigan
Child Support in Michigan: How It's Calculated, Modified & Enforced
A plain-English guide to Michigan child support — the guideline model, how the number is computed, the modification and enforcement process, and where to find the official worksheet.
Direct answer
Net. The MCSF defines net income as gross income minus federal/state/local taxes, Social Security/Medicare, mandatory retirement, union dues, and prior court-ordered support for other children.
Michigan uses the Income Shares model but calculates on each parent's NET income as defined by the Michigan Child Support Formula (MCSF) — gross income minus taxes, FICA, mandatory retirement, union dues, and prior court-ordered support. The 2025 MCSF Manual (effective January 1, 2025) produces a presumptive monthly amount that courts must order unless they state a deviation on the record. A parental-time (overnight) offset reduces the base as overnights increase (growing above about 128 overnights), and ordinary medical costs are built in at $200/child/year (2025).
Open the Michigan child support calculator to see your own number under the current guideline: Michigan calculator.
How a support order is established in Michigan
Open a case with the Friend of the Court (FOC) in the county or file with the circuit court (divorce, paternity, or support action). For unmarried parents, establish parentage first.
Both parents provide financial documents; the FOC determines each parent\'s MCSF net income from all sourced income.
The FOC runs the MiChildSupport Calculator (pcal.state.mi.us) or the manual worksheet, applying the base schedule, parental-time offset, and add-ons (health care, childcare).
The resulting formula amount is the presumptive order. A judge may deviate only by stating on the record why the formula would be unjust or inappropriate, the deviation, and its value.
The order is entered, usually with income withholding.
To modify: request an FOC review (generally available about every 36 months, and recommended only if the new amount differs by at least 10% or $50/month), or file a motion showing a change in circumstances. Modifications apply from the filing date, not retroactively.
Worked examples
Illustrative example — one child, net income with overnights — Parent A (payor) MCSF net income $4,000/month; Parent B (recipient) $3,000/month. One child. Parent A has 100 overnights per year. The 2025 MCSF starts from each parent\'s net income (gross minus taxes, FICA, mandatory retirement, prior support). Combined net = $7,000. The base-support schedule returns a base obligation; ordinary medical is included at $200/child/year. The parental-time offset reduces the base according to overnights (modest at 100, larger above ~128). Each parent pays their income-share of the adjusted base plus childcare/health costs. (Exact base from the MCSF manual/supplement; the split is the state\'s Income Shares method.) Michigan uses net income and adjusts for overnights; the formula amount is presumptive unless the court records a specific deviation.
Illustrative example — near-equal parenting time — Parents have roughly equal overnights (about 182.5 each, true 50/50) and different incomes. At true 50/50 parenting time, the MCSF has the higher-earning parent pay the other the difference between what each would otherwise owe, reflecting duplicated household costs. More overnights reduce the transfer; at equal time the higher earner pays only the gap between the two computed obligations.
Modifying or enforcing an order
Orders in Michigan can be modified when there is a substantial change in income, custody, or circumstances. Use the modification eligibility check and the cross-state comparison tool to see how a move would change the outcome. Enforcement runs through the state agency and can include income withholding and contempt proceedings.
Official sources
2025 Michigan Child Support Formula Manual (PDF) — https://www.courts.michigan.gov/49cfe9/siteassets/court-administration/standardsguidelines/foc/2025mcsf.pdf
Net. The MCSF defines net income as gross income minus federal/state/local taxes, Social Security/Medicare, mandatory retirement, union dues, and prior court-ordered support for other children.
How does parenting time affect support?
The parental-time offset lowers the base obligation as overnights increase; the reduction grows noticeably above about 128 overnights per year, and at equal (182.5) overnights the higher earner pays the difference between obligations.
Can the court deviate from the formula?
Yes, but only by stating on the record why the formula amount would be unjust or inappropriate, what the deviation is, and its value. The formula is the starting point in nearly every case.
What changed in the 2025 manual?
The 2025 MCSF (effective Jan. 1, 2025) lowered built-in ordinary medical costs to $200/child/year (from $454) and presumes work-related childcare need ends the month a child turns 13.
How do I modify an order?
Request an FOC review (typically every 36 months; recommended only if the new amount differs by ≥10% or $50/month) or file a motion on changed circumstances. Changes apply from filing, never retroactively.
Michigan child support calculator
Estimate for Michigan
Michigan uses the Income Shares model.
Enter the paying parent’s gross (pre-tax) monthly income.
Michigan Child Support Worksheet — Planning Estimate
Generated September 22, 2026 · Model: Income Shares · Income basis: gross · Statute: Mich. Comp. Laws § 552.16
This is an informal planning estimate, not a court worksheet and not legal advice. Confirm the current guideline with the state child-support agency or a licensed family-law attorney.
Estimated monthly support$1,284.91per month
Official schedule: Michigan Child Support Formula (MCSF), General Care Support Table, 2021 Supplement (State Court Administrative Office, Friend of the Court Bureau, Effective Jan. 1, 2021). The schedule is a continuous marginal-rate formula, not discrete lookup rows. (2021)
Annual estimate$15,418.92
Effective rate25.7%
MethodIncome Shares: combined income → official Michigan schedule → split by income share (+ add-ons, parenting-time credit)
View calculation breakdown
Combined parental income
$9,000
Total basic obligation (schedule)
$2,313
Obligor income share
55.6%
Obligor basic obligation
$1,285
Estimated monthly support
$1,285
How the basic obligation splits between parents
56%
44%
Paying parent: $1,285 Other parent: $1,028
Each parent pays their proportional share of the combined basic obligation.
Estimated monthly support by number of children
At the incomes you entered, for 2 children.
This article is general education, not legal or tax advice. For your exact number, open your state calculator.
Not legal or financial advice. This estimate follows the state’s statutory guideline formula but cannot capture every factor a court considers (health insurance, childcare, prior orders, deviations, imputed income).
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