Quick answer: In Michigan, each support payment is a judgment on its due date and cannot be modified retroactively, except from the date notice of a pending petition was given. The friend of the court need not petition unless the formula differs from the order by 10% or $50 a month, whichever is greater.
This Michigan child support modification calculator applies MCL 552.603. Enter your current order and the amount the formula gives today (you can get it from the Michigan child support calculator) and it shows whether the threshold is met, the monthly gap and what it adds up to after notice of your petition. The threshold decides when the friend of the court must act; the court can still modify on a change in circumstances.
Michigan child support modification at a glance
| Rule | What Michigan says |
|---|---|
| Retroactivity | A support payment is a judgment on and after its due date and is not subject to retroactive modification, except for a period when a petition is pending, and only from the date notice of the petition was given (MCL 552.603(2)) |
| Formula | The court orders support under the Michigan child support formula and may deviate only with written or on-the-record findings (552.605(2)) |
| Threshold | The friend of the court need not petition if the difference is under the formula’s minimum threshold (552.517(5)(a)); the 2025 manual states it as 10% or $50 a month, whichever is greater |
| Reviews | Every 36 months in public assistance cases; on written request, but the office need not act on more than one request from a party every 36 months (552.517(1)) |
| Time to act | After determining a review is required, the office must obtain a modification within 180 days if appropriate (552.517(3)) |
| Incarceration | Support abates by operation of law if the payer will be incarcerated 180 consecutive days or more with no ability to pay (552.517f) |
How does child support modification work in Michigan?
- Know the standard and the threshold. See the Michigan change in circumstances standard and the 10% or $50 threshold.
- File and give notice on time. See how to modify child support in Michigan.
- Income problems and incarceration. See lowering child support after job loss or incarceration in Michigan and, for what stays owed from before notice, the Michigan child support arrears calculator.
What does this modification calculator check?
The calculator compares the monthly gap with the formula threshold of 10% of the order or $50 a month, whichever is greater, and shows the accrued difference after notice of the petition. It does not decide whether a court will find a change in circumstances. The months before notice are the ones you cannot recover.
Frequently asked questions
How much does Michigan child support have to change to be modified?
On a friend of the court review, the formula threshold is 10% of the current order or $50 a month, whichever is greater. A smaller change can still be raised with the court as a change in circumstances.
From what date can Michigan child support change?
Only from the date notice of the petition for modification was given to the other party; each payment is a judgment on its due date.
How often can I ask the Michigan friend of the court to review my order?
On written request, but the office is not required to act on more than one request from a party every 36 months.
Does a Michigan jail sentence change child support?
If the payer will be incarcerated for 180 consecutive days or more and cannot pay, the monthly support is abated by operation of law.
Are Michigan child support orders stated monthly?
Yes. All support orders are stated in monthly amounts payable on the first of each month in advance.
Official sources
- MCL 552.603: support order as a judgment; no retroactive modification
- MCL 552.605: child support formula and deviation
- MCL 552.517: review of child support orders
- MCL 552.517b: review notice, objections and imputed income
- MCL 552.517f: abatement during incarceration
- 42 U.S.C. 666(a)(9): no retroactive modification of support already due