How Michigan Calculates Child Support Payments

Michigan child support amounts are set by a formula, not a judge's discretion

Michigan uses a statutory formula to calculate child support. The amount depends on both parents' gross income, the number of children, and how much time each parent spends with the children. The state publishes income caps and adjustment percentages each year, so the exact dollar amount you owe or receive changes based on current guidelines.

The formula starts with combined parental income, applies a percentage based on the number of children, then divides the obligation between parents according to their income shares. A parent earning 60% of combined income pays roughly 60% of the support obligation. The calculation sounds mechanical, but income itself is defined broadly — it includes wages, self-employment earnings, bonuses, rental income, and other sources.

Michigan courts can deviate from the formula if they find it unjust or inappropriate, but they must state their reasons in writing. Most cases follow the guideline amount or stay very close to it.

Key Takeaways

• Michigan calculates child support using a percentage of combined parental income, with the percentage varying by number of children (17% for one child, 25% for two, 29% for three, 31% for four, 32% for five or more).
• Both parents' gross income is included in the calculation, including wages, self-employment earnings, bonuses, and investment income, up to an annual cap that Michigan adjusts yearly.
• The obligation is divided between parents based on their share of combined income, so a parent earning 40% of the total pays 40% of the calculated support amount.
• Custody time (called parenting time in Michigan) affects the calculation through a deduction for the parent paying support, reducing their obligation if they have significant overnight time with the children.
• Courts can order amounts above or below the guideline if they find the formula would be unjust, but they must explain their reasoning in the court order.

The income percentage that applies to your situation

Michigan's formula multiplies combined parental income by a set percentage based on how many children need support. One child is 17% of combined income. Two children is 25%. Three children is 29%. Four children is 31%. Five or more children is 32%.

This percentage has stayed the same for years, so the guideline amount changes only when parents' income changes or the number of children changes. If you and the other parent earn $100,000 combined and have two children, the total support obligation is $25,000 per year, or about $2,083 per month. If you earn 60% of that combined income, you would pay 60% of $2,083, which is roughly $1,250 per month.

The calculation assumes both parents contribute to the children's living expenses. If one parent has the children most of the time, the other parent pays support. If both parents share time roughly equally, the formula still applies, but the paying parent gets a deduction based on their parenting time.

What counts as income and the annual cap

Michigan includes most sources of money in "gross income" for child support purposes. Wages and salary are the most common, but the definition also covers self-employment income, bonuses, commissions, rental income, interest and dividend income, Social Security benefits (with some exceptions), unemployment benefits, and workers' compensation. Gifts and loans do not count.

Michigan sets an annual income cap each year. For 2024, the cap is $163,000 per parent. Income above that cap is not automatically included in the calculation, though a court can choose to include it if the court finds it appropriate. The cap adjusts annually, so check the current year's guideline if you are calculating support for a case filed in a different year.

Self-employed parents must report net income (revenue minus legitimate business expenses). If you own a business, you will need to provide tax returns and business records to prove your actual income. Courts are skeptical of inflated expenses or sudden income drops, especially if the parent's lifestyle has not changed.

How parenting time reduces the paying parent's obligation

If the parent paying support has the children overnight a significant portion of the time, Michigan reduces their support obligation. The reduction is calculated as a percentage of the guideline amount, based on the number of overnights per year.

The exact threshold varies, but generally if the paying parent has fewer than 10% of overnights (roughly 36 nights per year), no reduction applies. If they have 10% to 50% of overnights, the reduction increases gradually. If they have more than 50% of overnights, the calculation shifts — the parent with less time may owe support instead, or the amounts may be offset.

Overnights are counted from the parenting time order, not from what actually happens. If the order says the paying parent has every other weekend but they actually have the children more often, the calculation still uses the order unless it has been formally changed. If parenting time has shifted significantly, you may need to ask the court to recalculate support.

When courts order amounts above or below the guideline

Michigan law allows courts to deviate from the guideline formula if they find it unjust or inappropriate. Common reasons include one parent's very high income (above the cap), a child with special needs requiring extra expenses, a parent's inability to work due to disability, or a substantial change in parenting time since the last order.

A court cannot straightforward decide the guideline "feels unfair." The judge must state specific facts and legal reasons for the deviation. For example, a court might order more support if a child attends private school and the guideline amount would not cover it, or less support if the paying parent has other children from a different relationship and limited income.

If you believe the guideline amount is unjust in your situation, you can ask the court to deviate, but you will need to present evidence — tax returns, medical records, school bills, or other documents — to support your request. straightforward disagreeing with the percentage is not enough.

How to find the current year's guideline amounts

Michigan's Friend of the Court office publishes a child support guideline table each year showing the monthly obligation for different income levels and numbers of children. The table is available on the Michigan Courts website under "Child Support Guidelines" or through your local Friend of the Court office.

The guideline table is a quick reference tool. You can find your combined income on the left side, look across to the column for your number of children, and see the total monthly obligation. Then divide that by the paying parent's income percentage to find their share. This gives you a rough estimate, but the actual calculation may differ if parenting time adjustments explore or if either parent's income is above the cap.

If you are in a case, the Friend of the Court office or your attorney can run the exact calculation using the current guideline. If you are trying to estimate what support might be, the published table is a good starting point.

Frequently Asked Questions

Does child support change if one parent loses their job?

Yes, but only if the job loss is involuntary and the parent has made a good-faith effort to find new work. A parent cannot straightforward quit their job to avoid support. If a parent is laid off or their business closes, they can ask the court to reduce support based on their new income, but they must show they are actively looking for work and cannot find comparable employment.

What if the paying parent's income is way above the cap?

Income above the cap is not automatically included, but the court can order support based on income above the cap if it finds that appropriate. The court might consider the child's actual needs, the standard of living the child would have had if the parents were together, and the paying parent's ability to pay. High-income cases often require evidence of the child's expenses or informed testimony.

Can child support be ordered if both parents have equal parenting time?

Yes. Even with equal time, the parent earning more income typically pays support to the parent earning less. The formula still applies; the higher-earning parent's obligation is just reduced by the parenting time adjustment. If both parents earn exactly the same income and have exactly equal time, support might be zero or very small.

Does child support include money for health insurance or daycare?

The guideline amount is for basic support only. Health insurance and daycare are usually ordered separately. A court typically orders the parent with better access to health insurance to cover the children, and daycare costs are often split between parents or added to the support obligation. These are separate line items in the order, not included in the percentage calculation.

What happens if circumstances change after the order is entered?

Either parent can ask the court to modify support if there has been a substantial change in circumstances — a significant income change, a major shift in parenting time, or a change in the number of children. The change must be substantial and ongoing, not temporary. A court will not modify an order based on a one-time bonus or a few months of reduced hours.