Michigan Child Support Calculator & Guide (2025)

Overview of Michigan Child Support

Michigan calculates child support using the Income Shares Model as defined by the Michigan Child Support Formula (MCSF). The formula is established by the Michigan State Court Administrative Office and is updated periodically to reflect current economic conditions.

Michigan's formula is notable for its parenting time offset, which adjusts the support amount based on the number of overnights the non-custodial parent has with the child. This ensures that the support calculation reflects the actual time each parent spends caring for the child and the direct expenses incurred during that time.

How Child Support Is Calculated in Michigan

The calculation follows these steps:

1. Determine net income for both parents — start with gross income and subtract federal and state taxes, Social Security, Medicare, health insurance premiums, mandatory retirement, union dues, and prior support obligations
2. Combine net incomes to get total household income
3. Find the base obligation from the Michigan Child Support Formula schedule based on combined income and number of children
4. Add healthcare costs — health insurance premiums and uninsured medical expenses for the child
5. Add childcare costs — work-related childcare expenses
6. Allocate proportionally — each parent's share is based on their percentage of combined income
7. Apply the parenting time offset based on the non-custodial parent's overnight stays

Example Calculation

Key Factors in Michigan Calculations

Income Definition

Michigan uses net income for the support calculation. Income sources include wages, salary, bonuses, commissions, self-employment income, Social Security benefits, disability benefits, unemployment compensation, pension and retirement income, rental income, and any other recurring income. Allowable deductions include federal and state income taxes, Social Security taxes, Medicare, health insurance premiums, mandatory retirement contributions, union dues, and prior support obligations.

Parenting Time Offset

Michigan's parenting time offset is a key feature of the formula. The base support obligation is reduced based on the number of overnights the non-custodial parent has with the child. The offset recognizes that when the non-custodial parent has significant parenting time, they are directly providing for the child's needs during those periods. The more overnights, the larger the offset.

Medical Support

Michigan courts typically order medical support as part of the child support obligation. This includes requiring one or both parents to maintain health insurance coverage for the child and sharing uninsured medical expenses (co-pays, deductibles, and out-of-pocket costs) proportionally based on income shares.

Childcare Costs

Work-related childcare expenses, including daycare, before-school and after-school care, and summer programs necessary for employment, are added to the base obligation and shared proportionally between parents.

Minimum and Maximum Amounts

Michigan does not have a fixed statutory minimum or maximum child support amount. The formula is considered a rebuttable presumption — the calculated amount is presumed correct unless the court makes specific findings that the amount is unjust or inappropriate. The court may deviate from the formula with written findings explaining the reasons.

Michigan provides a self-support reserve to ensure the paying parent retains enough income for basic subsistence. If the formula would leave the obligor below this threshold, the support obligation may be reduced.

Modification and Enforcement

Modification

Either parent can request a modification by filing a motion with the circuit court or through the Friend of the Court office. Modification is appropriate when:

• A change in circumstances makes the existing order unreasonable
• The current support differs from the formula amount by 20% or more (unless the difference is due to a previously granted deviation)
• Either parent's income has changed significantly
• Custody or parenting time has changed
• A child has been emancipated

Enforcement

The Michigan Department of Health and Human Services, Office of Child Support, and local Friend of the Court offices enforce child support through:

• Income withholding orders
• Tax refund interception (state and federal)
• Driver's license suspension
• Professional and occupational license suspension
• Credit bureau reporting
• Property liens
• Contempt of court proceedings
• Passport denial for arrears exceeding $2,500

Get your Michigan child support estimate now: Use our free calculator to see what you might owe or receive under Michigan guidelines.