Michigan Child Support Calculator and
Guidelines Worksheet

Michigan calculates the amount of child support using the Michigan Child Support Formula (MCSF), codified in [MCL § 552.519](https://www.legislature.mi.gov/Laws/MCL?objectName=mcl-552-519) and governed by the Michigan Child Support Formula Manual. The Michigan Department of Health and Human Services oversees the program, with local Friend of the Court (FOC) offices in each county handling day-to-day child support amounts, enforcement, and modifications.

If you need a lawyer for your child support case, the FOC can provide information about using the Michigan child support formula.

Michigan's formula starts with each parent's gross income and applies deductions — federal and state income taxes, Social Security and Medicare taxes, mandatory union dues, health care premiums for the child, child care costs, other child support obligations, and certain pension contributions — to reach each parent's net income. The MCSF calculates a "base support" amount for each parent based on their individual net income, then offsets the two parents' base support amounts to determine the transfer payment.

Health care and child care costs are added proportionally. A judge may order support above or below the formula amount when the standard calculation would be unjust.

Michigan's formula uses parenting time (overnights per year) as a direct variable. As the non-custodial parent's overnight count increases above 128 overnights (35% of the year), the MCSF applies a parenting time offset that progressively reduces the child support amounts.

The Friend of the Court (FOC) office in each county can help enforce child support and order support modifications. The Michigan Department of Health and Human Services IV-D Child Support Program provides enforcement and can assist families receiving public assistance.

Parents paying or receiving child support can contact their county FOC directly.

Under Michigan's Income Shares model, the calculation begins by determining each parent's gross income from all sources, including wages, salaries, commissions, bonuses, self-employment income, rental income, and certain benefits. The court then applies allowable deductions — such as taxes, mandatory retirement contributions, and pre-existing child support obligations — to arrive at each parent's adjusted or net income.

Both incomes are combined to find the total household income available for child support.

The combined income figure is then matched against Michigan's child support schedule (referenced in Income Shares model using both parents' net income with the Michigan Child Support Formula Manual), which provides a base obligation amount for the number of children involved. For example, under a typical Income Shares schedule, parents with a combined monthly income of $8,000 and two children have a presumptive obligation of $1,400 per month.

Each parent's share is then calculated in proportion to their contribution to the combined income — if one parent earns 60% of the total, they are responsible for 60% of the base obligation.

Additional expenses are layered on top of the base obligation. Health insurance premiums for the child, work-related childcare costs, and extraordinary expenses (such as special education or medical needs) are typically added to the base figure and divided proportionally between the parents.

The custodial parent's share is assumed to be spent directly on the child, while the non-custodial parent's share becomes the child support payment.

The number of children is the most direct factor in any Michigan child support calculation under the child support guidelines in Income Shares model using both parents' net income with the Michigan Child Support Formula Manual. The basic child support obligation increases with each additional child, though not in a strictly linear fashion.

The amount of child support also depends on each parent's monthly gross income, which includes wages, salary, commissions, bonuses, and other recurring sources. The noncustodial parent's share is calculated based on their proportion of the combined monthly gross income.

Health care and child care costs play a major role. The parent who carries the child's health insurance receives a credit or offset, and unreimbursed medical expenses exceeding a threshold are typically split between the parents.

Child care costs necessary for employment or education are added to the basic child support obligation and divided proportionally between parents.

Children with special needs — whether physical, developmental, or educational — can significantly increase the amount of child support. Michigan courts operating under Mich.

Comp. Laws § 552.605; Michigan Child Support Formula have discretion to deviate upward from the guideline amount when a child requires therapies, specialized schooling, or ongoing medical treatment that exceeds ordinary expenses.

Similarly, extracurricular activities and private school tuition may be considered, though courts vary in how they treat these costs.

High-income cases present unique challenges. Where Michigan's schedule under Income Shares model using both parents' net income with the Michigan Child Support Formula Manual sets a maximum combined income threshold, courts exercise independent discretion above that cap rather than applying the standard table.

When a parent is voluntarily unemployed or underemployed, Michigan courts may impute income — assigning an earning capacity based on the parent's education, work history, job market conditions, and prior earnings — to prevent artificially lowering the child support amount by choosing not to work or accepting a lower-paying job without justification.

Michigan's child support obligation generally continues until the child reaches the age of majority under state law — check Mich. Comp.

Laws § 552.605; Michigan Child Support Formula for the specific cutoff age, which may extend beyond 18 in certain circumstances such as a child still in high school or college. Support may also end earlier if the child becomes emancipated through marriage, military service, or court order.

Either parent may petition the court under Mich. Comp. Laws § 552.605; Michigan Child Support Formula to modify a child support order when there has been a material change in circumstances. Common triggers include:

• A significant income change for either parent (a material change in circumstances — such as a significant income shift, change in custody arrangement, or change in the child's needs — is generally required to modify the existing order; the exact threshold under Mich. Comp. Laws § 552.605; Michigan Child Support Formula controls for Michigan)
• Loss of employment or onset of a disability
• A significant change in the child's medical, educational, or developmental needs
• A substantial change in the custody or parenting-time arrangement

The parent seeking modification bears the burden of proving that circumstances have genuinely changed since the last order.

Modifications in Michigan under Mich. Comp.

Laws § 552.605; Michigan Child Support Formula are not automatic — even when circumstances change, the existing order remains in effect until a court enters a new one. Filing promptly matters because modifications typically take effect from the date of the petition, not retroactively to when the change occurred.

Parents who delay filing risk accumulating arrears under the original order that cannot be forgiven, since federal law prohibits retroactive reduction of child support arrears. Families navigating this process should contact a Michigan family law attorney to confirm the specific modification threshold and filing procedures that apply to their order.

Michigan has multiple enforcement mechanisms under Mich. Comp.

Laws § 552.605; Michigan Child Support Formula to ensure child support is paid. The most common tool is income withholding (wage garnishment), which is now mandatory for most new and modified child support orders.

Under an income withholding order, the obligor's employer deducts the support amount directly from their paycheck and sends it to the state disbursement unit. This approach removes the obligation from the paying parent's discretion and provides the custodial parent with reliable, timely payments.

When wage garnishment is insufficient or the obligor is self-employed, Michigan can pursue additional enforcement actions:

• Intercepting federal and state tax refunds
• Placing liens on real and personal property
• Suspending driver's licenses and professional or occupational licenses
• Denying or revoking passport applications for arrears exceeding $2,500
• Reporting delinquent obligors to credit bureaus

Each tool creates significant practical consequences that apply without a separate court hearing.

In severe cases, Michigan courts may hold a non-paying parent in contempt of court, which can result in fines, community service, or incarceration. Repeated willful failure to pay can lead to criminal prosecution under both state and federal law.

The Deadbeat Parents Punishment Act makes it a federal crime to willfully fail to pay child support for a child living in another state when the arrearage exceeds $5,000 or has been unpaid for more than one year. The federal Office of Child Support Services (OCSE) can assist custodial parents with enforcement at no cost.

To contact the Michigan child support program directly, use the OCSE state programs directory.

The amount of parenting time each parent exercises directly affects the child support calculation in Michigan. When the non-custodial parent has the child for a significant number of overnights — typically 25% or more of the year (approximately 92 overnights in many jurisdictions) — Michigan's guidelines under Income Shares model using both parents' net income with the Michigan Child Support Formula Manual apply a shared-custody or parenting-time adjustment that reduces the non-custodial parent's obligation.

A parent who has the child more often incurs more direct expenses for housing, food, and daily needs, so the transfer payment to the other parent reflects that shared financial responsibility.

In cases where parents share custody equally (50/50), Michigan courts typically still calculate support based on the income differential between the parents. The higher-earning parent generally pays support to the lower-earning parent, even in a true 50/50 arrangement, because the child's standard of living should be roughly comparable in both households.

The amount is usually significantly lower than in a traditional custody arrangement as calculated under Income Shares model using both parents' net income with the Michigan Child Support Formula Manual. Even small changes in the overnight count — such as moving from 120 to 128 overnights — can cross a threshold that triggers a meaningful change in the support calculation.

Use the Michigan Custody Time Calculator to track overnights precisely and determine which parenting time threshold applies to your schedule.

The Michigan child support calculator applies the Michigan Child Support Formula (MCSF) as updated by the Michigan Supreme Court. Michigan is one of the few states that uses a detailed statewide formula document rather than a simple schedule — the MCSF spans hundreds of pages and covers every aspect of child support calculation including income determination, childcare, healthcare, and parenting time adjustments.

Michigan courts are required to follow the MCSF, and any deviation from the MCSF-calculated amount requires written findings specifying why the formula result is unjust or inappropriate. The Office of Child Support within the Michigan Department of Health and Human Services administers the state child support program.

Michigan child support calculations use both parents' net incomes (after taxes and required deductions). Health care and child care costs are direct inputs — the parent who carries health insurance receives a credit, and work-related childcare expenses are shared proportionally.

The Michigan child support formula counts nights per year (overnights) to determine the parenting time offset: the offset applies when the non-custodial parent has 128 or more overnights annually (35%). This calculator does not upload or store your income or custody data — we protect your privacy by processing all calculations in your browser.

If the non-custodial parent fails to pay, the Friend of the Court (FOC) can pursue enforcement including contempt proceedings, which may result in jail time. Child support orders are reviewable every 36 months at no cost through the FOC office in each county.

The support calculation provided by this estimator applies the Michigan Child Support Formula to estimate each parent's court-ordered payment obligation. Michigan child support formula says the parent's income — and both parents’ income combined — drives the base support amount; wages, overtime, bonuses, and self-employment earnings are all included.

Parents must provide health care coverage for the child if accessible and affordable; if a parent cannot provide health care, the court may order cash medical support. If paternity has not been established, Michigan courts handle paternity proceedings through the Friend of the Court before a support order is entered.

Either parent can ask the court to review the order every 36 months through the FOC at no cost. Child support even continues past age 18 when the child is still enrolled in high school.

The noncustodial parent must pay support through the Michigan State Disbursement Unit (MiSDU); parents who fail to pay support face contempt enforcement by MDHHS.