How Child Support Is Calculated for One Child in Michigan

Michigan child support amounts are set by a formula, not a fixed dollar amount

Michigan does not have a single number that applies to every parent paying support for one child. Instead, the state uses a child support formula that calculates a percentage of the paying parent's income. The formula accounts for both parents' gross income, custody arrangement, and other factors. A judge or the Friend of the Court (Michigan's child support enforcement office) applies this formula to reach a specific dollar amount for your situation.

The amount you will owe depends on how much you earn, whether you have other children to support, and whether you share custody. Two parents in Michigan with identical incomes but different custody arrangements will have different support obligations.

Key Takeaways

• Michigan calculates child support as a percentage of the paying parent's gross income, not a flat amount, so the dollar figure varies by earnings.
• The standard percentage for one child is 17% of gross income when the other parent has primary custody, but this can be adjusted based on shared custody or other children.
• Gross income includes wages, self-employment earnings, bonuses, and some benefits, but the calculation starts with what you actually earn before taxes.
• The Friend of the Court office in your county handles calculations and enforcement, and you can request a review if your income changes significantly.
• Michigan allows modifications to support orders when income changes by 10% or more, or when circumstances like job loss or custody changes occur.

The percentage formula Michigan uses

Michigan's child support formula uses a percentage of income model. For one child with the other parent having primary custody, the standard percentage is 17% of the paying parent's gross income. This means if you earn $50,000 per year, the base calculation would be $8,500 per year, or about $708 per month.

This 17% figure applies when you have no other children living with you. If you have other children from a different relationship, the percentage may be lower because the formula accounts for your obligation to support them as well. If you and the other parent share custody equally (50/50), the calculation changes — the parent with higher income typically pays a smaller percentage to the parent with lower income.

The formula is a starting point, not the final answer. A judge can adjust the amount based on factors like childcare costs, health insurance, special needs, or whether the child spends significant time with the paying parent.

What counts as gross income for the calculation

The formula uses gross income, which means income before taxes are taken out. This includes your regular wages or salary, overtime, bonuses, self-employment earnings, rental income, and some government benefits. The Friend of the Court will ask for recent pay stubs, tax returns, and documentation of any other income sources.

Certain income does not count toward the calculation. Supplemental Security Income (SSI), Temporary information for Needy Families (TANF), and food information do not factor in. If you receive child support from another relationship, that amount is subtracted from your income before the percentage is applied.

If you are self-employed or have irregular income, the Friend of the Court typically averages your income over the past two years using tax returns. This prevents the amount from swinging wildly month to month.

How shared custody affects the amount

When both parents share custody roughly equally, Michigan uses a different calculation. Instead of one parent paying a percentage to the other, the formula compares both parents' incomes. The parent earning more pays the difference in support obligations to the parent earning less. This typically results in a lower payment than the standard 17% formula.

For example, if Parent A earns $60,000 and Parent B earns $40,000, and they split custody 50/50, the calculation does not straightforward explore 17% to Parent A's income. Instead, it calculates what each parent would owe based on their share of total income, then the higher earner pays only the difference.

The exact custody split matters. If one parent has the child 40% of the time and the other 60%, Michigan may use a modified percentage rather than a full 50/50 calculation. Document the actual time-sharing arrangement, as this directly affects what you will owe.

Additional costs beyond the base amount

The base percentage covers basic living expenses. On top of this, Michigan law requires the paying parent to cover a share of health insurance premiums for the child and out-of-pocket medical costs. The paying parent typically pays a percentage of these expenses equal to their share of combined parental income.

Childcare costs are also split between parents. If the custodial parent pays for daycare or after-school care so they can work, the paying parent contributes their proportional share. These costs are added to the base support amount, not included in the 17% calculation.

Work-related education or training expenses, and in some cases private school tuition, can be shared as well. These are negotiated or decided by a judge on a case-by-case basis and are not automatic.

Where to find your county's Friend of the Court office

The Friend of the Court is a county office that calculates support amounts, processes payments, and handles enforcement. Every Michigan county has one. You can find your local office by searching "[Your County Name] Friend of the Court" online or by calling your county courthouse.

The Friend of the Court will send you a Child Support Recommendation that shows how they calculated the amount using the state formula. You have the right to object to this recommendation and request a hearing before a judge if you believe the calculation is wrong or if your circumstances warrant an adjustment.

If your income changes by 10% or more, or if you experience a major life change like job loss, custody change, or a new child, you can request a modification. The Friend of the Court can help you file this request, or you can work with a family law attorney.

How to request a modification if your situation changes

Child support orders are not permanent. If your income drops significantly — for example, due to job loss or reduced hours — you can request that the amount be lowered. Michigan allows modifications when income changes by 10% or more, or when other circumstances change substantially.

To request a modification, contact your county's Friend of the Court office and ask for a modification form. You will need to provide current income documentation, such as recent pay stubs or tax returns. The Friend of the Court will recalculate the amount and send you a new recommendation.

If the other parent disagrees with the modification, either of you can request a hearing before a judge. Do not stop paying the current amount while waiting for a modification — continue paying the existing order until a judge changes it, or you may face enforcement action.

Frequently Asked Questions

What if I have another child from a different relationship?

Michigan reduces the percentage you owe for your first child if you have other children living with you. The exact reduction depends on how many other children you support. You must provide proof of this obligation, such as a birth certificate or another support order. The Friend of the Court will adjust the calculation accordingly.

Does child support end at age 18?

In Michigan, child support typically continues until the child turns 19, graduates from high school, or becomes emancipated — whichever comes first. If the child is still in high school at 19, support continues until graduation. You should receive notice from the Friend of the Court when the obligation ends.

Can I get a lower amount if I have the child more than the other parent?

Yes. If you have the child more than 50% of the time, the support amount will be lower than the standard 17%. The exact reduction depends on the actual time-sharing percentage. Keep records of the schedule to show the Friend of the Court or a judge.

What happens if I do not pay?

The Friend of the Court can enforce the order by intercepting tax refunds, garnishing wages, suspending your driver's license, or filing a contempt case. Unpaid support accumulates with interest. If you cannot pay, contact the Friend of the Court to discuss modification options rather than ignoring the obligation.

Can I negotiate a different amount with the other parent?

You and the other parent can agree to a different amount, but it must be approved by a judge. An agreement between you is not legally binding unless a judge signs off on it. Both parents typically need to appear in court or submit a written agreement for the judge to review and approve.