Michigan child support is calculated using the Michigan Child Support Formula (MCSF), an income shares model that combines both parents' net incomes to determine the total support obligation under MCL § 552.605. For a parent earning $50,000 annually with standard 80/20 parenting time, monthly child support for two children typically ranges from $900 to $1,200, depending on the other parent's income and additional expenses like health insurance and childcare. The formula requires courts to apply state guidelines unless doing so would be unjust or inappropriate.
Key Facts
| Category | Details |
|---|---|
| Filing Fee | $255 with minor children ($175 base + $80 Friend of Court fee) |
| Residency Requirement | 180 days state, 10 days county |
| Waiting Period | 60 days minimum (no minor children), 180 days with minor children |
| Formula Type | Income Shares Model |
| Low Income Threshold | $1,255/month net income |
| Ordinary Medical Cap | $200 per child per year (2025 formula) |
| Childcare Age Limit | Until month child turns 13 |
| Support Termination | Age 18 (or 19.5 if in high school full-time) |
How Michigan Calculates Child Support
Michigan determines child support by combining both parents' net monthly incomes and applying the state formula to calculate a base support amount, which is then adjusted for parenting time, health insurance costs, and childcare expenses under MCL § 552.605. The 2025 Michigan Child Support Formula Manual, effective January 1, 2025, uses each parent's actual share of combined family income rather than the previous 10-90% limitation. Courts must apply the formula unless deviation factors justify a different amount.
The calculation process follows these steps:
- Determine each parent's gross income from all sources
- Subtract allowable deductions (taxes, prior support orders, mandatory union dues)
- Calculate net income for each parent
- Combine net incomes to determine family income
- Apply formula tables based on number of children
- Adjust for parenting time overnights
- Add health insurance and childcare components
Under MCL § 552.605(2), courts may deviate from the formula when strict application would produce an unjust result, but must document the formula amount, the deviation, and specific reasons justifying the change.
Income Calculation Under Michigan Guidelines
Michigan defines income broadly to capture all regular sources of funds available to a parent for child support purposes under the 2025 MCSF Manual. The formula includes traditional wages, self-employment earnings, gig economy income from rideshare and delivery work, bonuses, commissions, rental income, investment returns, Social Security benefits, workers' compensation, unemployment benefits, and retirement distributions. Courts may impute income to unemployed or underemployed parents based on earning capacity.
The Low Income Threshold for 2025 is $1,255 per month, based on the federal poverty guideline. Parents earning below this threshold have reduced obligations calculated using a modified formula. The ordinary medical expense allowance decreased from $454 to $200 per child under the 2025 formula, meaning more out-of-pocket medical costs are now shared between parents proportionally.
Income excluded from calculation includes:
- Means-tested public assistance (SNAP, TANF, SSI)
- Child support received for other children
- Income of new spouses (except in rare circumstances)
- One-time gifts or inheritances (unless producing regular income)
Sample Child Support Calculations
Understanding how much is child support in Michigan requires examining real-world scenarios with specific numbers. The following examples demonstrate how the formula applies to typical Michigan families.
Example 1: Standard Custody Arrangement
Jacob earns $4,200 monthly net income ($50,400 annually). Sarah earns $2,800 monthly net income ($33,600 annually). They have two children who live primarily with Sarah. Jacob has parenting time of 73 overnights annually (80/20 schedule). Jacob provides health insurance for the children.
Result: Jacob pays $1,097 monthly in child support.
Example 2: Increased Parenting Time
Same income scenario, but Jacob increases summer parenting time to 109 overnights annually (70/30 schedule).
Result: Jacob pays $952 monthly, a reduction of $145 per month ($1,740 annually).
Example 3: Near-Equal Parenting Time
Same income scenario with 146 overnights for Jacob (60/40 schedule).
Result: Jacob pays $643 monthly, a reduction of $454 from the original amount ($5,448 annual difference).
These examples illustrate how parenting time directly affects support obligations. Each additional overnight with the non-custodial parent reduces the monthly payment because that parent is directly covering more daily expenses for the child.
Health Insurance and Medical Expenses
Michigan child support orders include a medical support component requiring one or both parents to maintain health insurance coverage for the children under MCL § 552.605. Health insurance is considered reasonable when the cost does not exceed 6% of the providing parent's gross income. If neither parent can obtain reasonable coverage, the court allocates responsibility for uninsured medical expenses between parents based on their income shares.
The 2025 formula sets ordinary medical expenses at $200 per child annually. This threshold represents routine co-pays, over-the-counter medications, and minor medical expenses. Medical costs exceeding $200 per child per year are considered extraordinary and divided between parents proportionally based on their percentage of combined income.
Medical expense categories include:
- Health insurance premiums (allocated to providing parent)
- Deductibles and co-pays above $200 annual threshold
- Dental and vision expenses not covered by insurance
- Mental health treatment costs
- Prescription medications
- Orthodontia and medically necessary treatments
Childcare Support Component
Work-related childcare expenses are added to the base support amount and divided between parents according to their income percentages under Michigan's formula. The 2025 MCSF Manual extended the presumed childcare age to the last day of the month the child turns 13, aligning with federal tax treatment of dependent care credits. Courts may extend childcare support beyond age 13 when circumstances warrant, such as children with special needs.
Childcare costs must be:
- Necessary for a parent's employment, education, or job search
- Actual, predictable, and reasonable in amount
- Supported by documentation (receipts, provider statements)
When parents have an established childcare pattern, actual costs are used. Without established costs, courts rely on community average rates or written provider quotations. Michigan's FOC offices maintain databases of local childcare costs for these calculations.
Parenting Time Impact on Support
Michigan's child support formula adjusts the base support amount based on the number of annual overnights each parent has with the children. More overnights with the non-custodial parent reduces their support obligation because they directly cover living expenses during those periods. The 2025 formula uses a more nuanced method for calculating shared parenting adjustments, particularly when parenting time approaches 50/50.
| Custody Arrangement | Annual Overnights | Typical Adjustment |
|---|---|---|
| Primary/Standard | 73 overnights | Full base support |
| Extended Summer | 109 overnights | 10-15% reduction |
| 60/40 Schedule | 146 overnights | 35-45% reduction |
| 50/50 Schedule | 182 overnights | Income differential only |
The formula prevents large, abrupt swings in support amounts due to minor schedule changes. Parents with nearly equal parenting time (above 146 overnights) see support calculated primarily on the income differential between them rather than traditional support tables.
Filing Fees and Court Costs
Filing for child support in Michigan requires payment of court fees that vary based on whether the case involves minor children and the type of proceeding. As of February 2025, the base filing fee for divorce with minor children is $255, consisting of a $175 base fee under MCL § 600.2529, a $25 electronic filing system fee, and a $55 custody/parenting time assessment directed to the Friend of the Court Fund.
Additional court costs include:
- Motion filing fee: $20 per motion
- Modification motion: Up to $60 filing fee
- Jury demand: $85 (rarely used in support cases)
- Judgment fee: $80
- Service of process: $25-$75 depending on method
Michigan courts waive filing fees for individuals with household income at or below 125% of federal poverty guidelines. For 2026, this threshold is approximately $19,506 for a single-person household or $40,000 for a family of four. Fee waiver requests require Form MC 20 with supporting income documentation.
Enforcement of Child Support Orders
Michigan enforces child support orders through the Friend of the Court (FOC) system, which monitors payments and initiates enforcement actions when parents fall behind under MCL § 552.605. Automatic wage withholding applies to all new child support orders unless both parents and the court agree otherwise. Employers deduct payments directly from wages before the employee receives their paycheck.
Enforcement consequences for non-payment include:
- Wage garnishment increased to cover arrears
- State tax refund interception (arrears over $150)
- Federal tax refund interception (arrears over $500)
- Driver's license suspension (2+ months behind)
- Professional license suspension or denial
- Hunting, fishing, and recreational license denial
- Passport revocation (arrears exceeding $2,500)
- Credit bureau reporting (automatic when 2+ months behind)
- Contempt of court with potential jail time
- Criminal prosecution under Michigan Penal Code § 750.165 (felony, up to 4 years imprisonment)
Child support arrears accrue interest at 2.5% per month, compounded annually. This means unpaid support grows significantly over time, making timely enforcement critical.
Modifying Child Support Orders
Michigan allows child support modification when a substantial change in circumstances makes the current order unfair or inappropriate under MCL § 552.605. Parents may request review through the Friend of the Court or file a modification motion directly with the court. The formula changing does not automatically modify existing orders; a formal motion must be filed.
Qualifying changes include:
- Income change of 10% or more (increase or decrease)
- Loss of employment or significant promotion
- Changes to parenting time arrangement
- Additional children born in subsequent relationship
- Health issues affecting earning capacity long-term
- Child begins or stops receiving Social Security benefits
- Active military duty lasting 6+ months with income reduction
- Significant changes in child's medical or educational needs
Important modification thresholds:
- Changes must be substantial and ongoing for at least 6 months
- If recalculated support differs by less than $50/month, modification typically denied
- Modifications are not retroactive; new amounts apply from filing date only
- Voluntary changes (quitting a job, buying assets) may not qualify
Michigan law permits review of child support orders every three years regardless of changed circumstances. Parents should document income changes and gather supporting evidence (pay stubs, tax returns, medical records) before filing.
Child Support Duration and Termination
Michigan child support obligations terminate when the child reaches age 18 under MCL § 722.52, with several important exceptions. Support extends to age 19.5 if the child remains enrolled full-time in high school, lives with the custodial parent, and has a reasonable likelihood of graduating. The obligation ends at 19.5 regardless of graduation status.
Support may terminate earlier through:
- Marriage of the child (emancipation)
- Military enlistment
- Court determination of self-sufficiency
- Death of the child or paying parent
Michigan does not mandate college support as a standard requirement. However, parents may voluntarily agree to contribute to post-secondary education, and courts will enforce such agreements. Children with disabilities may receive continued support if the disability existed before age 18 and prevents self-sufficiency.
Using the Michigan Child Support Calculator
Michigan provides an official child support calculator through the MiChildSupport portal (micase.state.mi.us). This calculator applies the current formula and produces estimates that courts use as starting points for support orders. Private calculators exist but may not reflect the most current formula tables.
To use the calculator effectively, gather:
- Both parents' gross monthly income from all sources
- Documentation of taxes and mandatory deductions
- Health insurance costs for children
- Actual or estimated childcare expenses
- Parenting time schedule (annual overnights)
- Information about other children supported
The calculator output represents the formula result under current guidelines. Courts may deviate from this amount based on deviation factors, but must document reasons in writing. Calculator estimates help parents understand likely obligations before filing.
Frequently Asked Questions
How much is child support in Michigan for one child?
Michigan child support for one child typically ranges from $400 to $1,200 monthly depending on parental incomes and parenting time. A parent earning $4,000 net monthly with standard 80/20 custody, where the other parent earns $2,500, would pay approximately $650-$750 monthly. The exact amount requires applying both incomes to the MCSF tables.
What percentage of income goes to child support in Michigan?
Michigan does not use a flat percentage system. The income shares model calculates both parents' combined obligation, then divides it proportionally. Effective rates typically range from 15-25% of the non-custodial parent's net income for one child, increasing to 25-35% for two children, depending on parenting time and the other parent's income.
Can Michigan child support be modified if I lose my job?
Yes, job loss qualifies as a substantial change in circumstances for modification under MCL § 552.605. File a modification motion immediately; support modifications take effect from the filing date, not retroactively. Document your job search efforts, as courts may impute income to voluntarily unemployed parents. The change must be ongoing for at least 6 months to satisfy court requirements.
Does Michigan child support include college expenses?
Michigan courts cannot order parents to pay college expenses as part of standard child support. Support terminates at 18 (or 19.5 if in high school). However, parents can voluntarily agree to college contributions, and courts will enforce written agreements. Consider including college provisions in your divorce settlement if this is important.
How does shared custody affect child support in Michigan?
Shared custody significantly reduces support obligations. With 50/50 parenting time (182+ overnights each), support is calculated based on the income differential between parents rather than traditional tables. The higher-earning parent typically pays a reduced amount to the lower-earning parent. Equal parenting time does not automatically mean zero support.
What happens if my ex doesn't pay child support?
Michigan's Friend of the Court enforces support orders through wage garnishment, tax refund interception, license suspensions, and contempt proceedings. Arrears over $2,500 can result in passport revocation. Willful non-payment is a felony under Michigan Penal Code § 750.165, punishable by up to 4 years imprisonment. Contact your FOC office to report non-payment.
How long does child support last in Michigan?
Child support continues until the child turns 18, or until age 19.5 if the child is enrolled full-time in high school and living with the custodial parent. Support ends earlier if the child marries, joins the military, or becomes legally emancipated. Disabled children may receive extended support if the disability prevents self-sufficiency.
Can child support be waived in Michigan?
Parents cannot waive child support because it belongs to the child, not the parents. However, courts may order $0 support if one parent earns below the Low Income Threshold ($1,255/month) or if parents have equal income and equal parenting time. The right to child support cannot be bargained away in divorce negotiations.
How do I calculate Michigan child support myself?
Use Michigan's official calculator at micase.state.mi.us with both parents' net incomes, parenting time schedule, health insurance costs, and childcare expenses. The calculator applies current MCSF tables. For complex situations involving self-employment, multiple children, or deviation factors, consult with a Michigan family law attorney.
What income counts for Michigan child support?
Michigan counts virtually all regular income: wages, salaries, bonuses, commissions, self-employment earnings, gig economy income, rental income, investments, Social Security, unemployment, workers' compensation, and retirement distributions. Excluded income includes means-tested benefits (SNAP, TANF, SSI), child support received for other children, and typically income of new spouses.