How to Modify Child Support in Michigan: A Complete Guide for Kalamazoo County Fathers

What Changes Can Let You Change Your Child Support Order

A child support order is not permanent. Under Michigan law, either parent can request a modification when circumstances change significantly. But the law requires more than a slight shift in finances. You need a substantial change in circumstances that affects the child's needs or either parent's ability to pay.

This guide explains what qualifies as a substantial change, how to file a modification request, and what the 2025 Michigan Child Support Formula changes mean for your case.

When Michigan Allows Child Support Modifications

Michigan law authorizes the Friend of the Court to review child support orders periodically. According to MCL 552.517, the office must use a child support formula developed by the state bureau to calculate support amounts. The statute also allows for modifications under several circumstances.

The Friend of the Court Act specifically identifies these grounds for reviewing and modifying support orders:

• Temporary or permanent changes in physical custody of a child that the court has not ordered
• Increased or decreased need of the child
• Changed financial conditions of a recipient of support or a payer, including application for or receipt of public assistance, unemployment compensation, or worker's compensation
• That the order was based on incorrect facts

Within 180 days after determining that a review is required, the office must obtain a modification of the order if appropriate. The office must use the child support formula in calculating the award and must petition the court if modification is determined to be necessary.

What Constitutes a Substantial Change in Circumstances

Not every financial change qualifies for modification. Courts require that changes be substantial, material, and ongoing for at least six months before they can be considered.

Income Changes

A significant increase or decrease in income is one of the most common reasons for modification. This includes:

• Job loss or involuntary termination of employment
• Substantial reduction in work hours or salary
• Promotion or significant career advancement
• Retirement
• Receipt of worker's compensation or unemployment benefits

Temporary hardships generally do not warrant permanent modification unless there is evidence of ongoing hardship. You will need to provide proof of your financial situation and demonstrate that you have made efforts to find alternative sources of income.

Changes in Childcare Expenses

The 2025 Michigan Child Support Formula extended childcare cost-sharing until the month a child turns 13. If your current order does not account for childcare costs through age 13, you may be entitled to a recalculation.

• Work-related before- and after-school care
• Summer programs
• Other supervision costs for children who cannot stay home alone

Changes in Medical Expenses

The 2025 formula also lowered the ordinary medical expense threshold from $454 per child per year to $200 per child per year. This means more out-of-pocket medical costs are now subject to sharing between parents.

• If your child has $600 in annual medical expenses, the old formula would have required sharing only $146
• Under the new formula, you would share $400

If your order uses the old threshold, you may qualify for modification to reflect current guidelines.

Changes in Custody Arrangements

A significant change in custody arrangements since the initial order may affect the amount of child support required. For example:

• If a parent who was originally paying child support now has primary custody of the child, they may be able to request a reduction in support payments
• If the custodial parent can demonstrate that the other parent is no longer fulfilling responsibilities, they may be able to request an increase

Changes in the Number of Children

If the number of children subject to the support order has changed, you may be eligible for modification.

Emancipation of the Child

Child support typically ends when a child reaches age 18 or graduates from high school, whichever comes later. However, if a child has special circumstances such as disabilities, support may continue beyond these milestones.

If your child has reached the age or event stated in the original order and your support obligation continues, you can request a modification to terminate payments.

The 2025 Formula Updates Themselves

The 2025 formula updates may qualify as a reason to revisit your existing order. If your order was calculated under the old formula and does not account for the new childcare and medical expense guidelines, you may be entitled to recalculation.

How to File for a Child Support Modification

To modify a child support order in Michigan, follow these steps:

File a Motion

Submit a motion to the court requesting a modification. The motion should clearly state the substantial change in circumstances and how it affects the child's needs or either parent's ability to pay.

The Friend of the Court office can also conduct reviews. You can request a support review through the Friend of the Court or file a motion for modification.

Provide Evidence

Gather documentation proving the material change in circumstances. Required documents typically include:

• Pay stubs showing current income
• Tax returns
• Medical bills and receipts
• Childcare receipts and invoices
• Parenting time records
• Proof of job loss or unemployment
• Bank statements

Attend a Court Hearing

A judge will review your case and determine if the modification is in the child's best interests. You must present your evidence and explain why the change qualifies under Michigan law.

Receive a Decision

The court will either approve, deny, or adjust the order based on the evidence presented. If the court grants the modification, it will issue a new order reflecting the changed circumstances.

Important Considerations

The 21-Day Rule

If the Friend of the Court determines there should be no change in the order and a party objects to the determination in writing to the office within 21 days after the date of the notice, the office must schedule a hearing before the court. This timeline is critical if you disagree with an initial review decision.

Minimum Threshold for Modification

The difference between the existing and projected child support award must meet the minimum threshold for modification established by the formula. If the difference is less than this threshold, the office may not need to petition the court for modification.

Informal Agreements Do Not Modify Court Orders

If you and your co-parent agree to change the support amount, that agreement is not enforceable until a court approves it. Paying less than the ordered amount—even with the other parent's verbal okay—can result in arrears and enforcement actions.

Working with the Friend of the Court

• Conduct periodic reviews of support orders every 36 months
• Review orders sooner when parties request it
• Petition the court for modifications when reasonable grounds exist

You can file a written request for review with the Friend of the Court. Within 14 days after receipt, the office must determine whether the order is due for review. The office is not required to act on more than one request received from a party every 36 months.

Why You Need Documentation

Courts require proof that changes are substantial and ongoing. Without proper documentation, your modification request may be denied. Gather as much evidence as possible before filing.

• Recent pay stubs
• Tax returns for the past year
• Unemployment benefits statements
• Worker's compensation documentation

• Receipts and invoices
• Contracts or agreements with providers
• Proof of work-related necessity

• Parenting time schedules
• Court orders
• Communication records

The Process Timeline

The modification process typically follows this timeline:

1. File your motion with the court
2. Friend of the Court reviews your request within 14 days
3. Office determines if review is required
4. Office calculates new support amount using the formula
5. Office sends notice to both parties within 180 days
6. If either party objects within 21 days, a hearing is scheduled
7. Court hearing takes place
8. Judge issues decision

When to Seek Legal Assistance

While you can represent yourself in a modification request, the process can be complex. Working with a qualified family law attorney can significantly improve your chances of a successful modification.

• Identify whether your situation qualifies for modification
• Gather and organize evidence
• Draft a proper motion
• Represent you at hearings
• Negotiate with the other party

Conclusion

Child support modification is not automatic. You must prove a substantial change in circumstances that affects the child's needs or either parent's ability to pay. The 2025 Michigan Child Support Formula changes have created new grounds for modification, particularly regarding childcare expenses through age 13 and the reduced medical expense threshold.

If you believe your circumstances have changed significantly, gather documentation and file a motion with the court. The Friend of the Court can assist with the review process, but you must take action to initiate it.

Remember that child support modifications must serve the best interests of the child. The court will carefully consider all factors when deciding whether to modify your order.

Sources

• MCL 552.517 - Review of child support order after final judgment; modification order; calculations; petition for modification; scheduling of hearing; petition to require dependent health care coverage; use of guidelines; costs. Michigan Legislature: https://legislature.mi.gov/Laws/MCL?objectName=MCL-552-517
• Lucido & Manzella, "When Can Child Support Be Modified in Michigan": https://www.lucidolaw.com/when-can-child-support-be-modified-in-michigan/
• Legacy Legal & Business Services, "Can You Modify a Child Custody or Support Order in Michigan?": https://www.legacylegalbusiness.com/blog/can-you-modify-a-child-custody-or-support-order-in-michigan/
• BBA Law, "2025 Michigan Child Support Changes: What Parents Need to Know About Childcare and Medical Expenses": https://bbalawmi.com/2025-michigan-child-support-changes-what-parents-need-to-know-about-childcare-and-medical-expenses/