Post-Divorce Modifications in St. Clair County: Changing Support and Custody Orders

Divorce doesn’t freeze your life in place. Jobs change. Children grow. Incomes rise and fall. Health declines. New relationships form. Yet the court order from your divorce continues to govern child support, spousal support, custody, and parenting time — often based on circumstances that no longer exist.

For families in St. Clair County, modifying a divorce order isn’t optional when life shifts dramatically. It’s a legal necessity. But Michigan courts don’t modify orders simply because one parent wants a change. You need to prove that something meaningful has shifted — and the specific legal standard depends on what you’re trying to modify.

Changing child support requires a different showing than changing custody. Modifying spousal support follows its own rules. And the procedural steps at the St. Clair County Circuit Court — including how the Friend of the Court handles reviews and recommendations — add a local layer that families need to understand before filing.

This guide walks through the grounds, process, and practical realities of modifying divorce orders in St. Clair County and Southeast Michigan in 2026.

Know Which Lane You’re In Before You File

Not all modifications follow the same path. Before you take any action, understand which lane applies to your situation — because filing the wrong motion wastes time, money, and credibility with the court.

Child support → Start with a Friend of the Court review (for straightforward recalculations) or file a motion to modify with the court (for contested or complex issues). The FOC reviews; the court modifies.
Parenting time → File a motion with the court. The threshold is proper cause or changed circumstances, but the evidentiary burden is generally lower than a custody change.
Custody → File a motion with the court — but you must first meet the Vodvarka threshold (proper cause or changed circumstances), and if an established custodial environment exists, you face the higher clear and convincing evidence standard. This is the hardest modification to win.

Getting the lane right from the start keeps your case focused and your credibility intact.

When Michigan Courts Will Modify a Divorce Order

Michigan courts will modify a divorce order when there has been a substantial change in circumstances since the original order was entered — but the specific legal standard depends on what you’re asking the court to change.

Modifying Child Support

Child support modifications are governed by MCL 552.517 and the Michigan Child Support Formula. Like other post-divorce modifications, child support changes require a showing of changed circumstances.

There are two distinct paths for child support changes — and the difference matters. The Friend of the Court can conduct a review of both parents’ financial circumstances and issue a recommendation. But only the court has authority to enter a modified order. An FOC review is often the faster and less expensive starting point for straightforward income changes, while a formal motion to modify filed with the circuit court is appropriate when issues are contested or complex.

One important benchmark: if the current order deviates from the amount that would be calculated under the current formula by 10% or more, that deviation strengthens the argument that circumstances have materially changed — though it does not constitute automatic grounds for modification on its own. The court still evaluates whether the underlying circumstances justify a change. Common triggers include:

Job loss, layoff, or significant income change for either parent
Changes in parenting time overnights — overnights directly affect the formula calculation
Changes in childcare costs — under the 2025 Michigan Child Support Formula updates, childcare expenses are now covered until the month a child turns 13 (previously age 12)
Changes in medical costs — the 2025 MCSF updates also significantly adjusted how ordinary medical expenses are calculated in the formula, lowering the threshold in ways that may affect existing orders
A child aging out of the support order

“The 2025 Michigan Child Support Formula updates changed how ordinary medical expenses and childcare costs are treated in the formula — so a recalculation under the current formula may produce a meaningful deviation from older orders, particularly for families in St. Clair County and Southeast Michigan whose orders predate the changes.”

These formula changes mean many existing child support orders may produce a significant deviation when recalculated — which, combined with the underlying factual changes, can build a strong case for modification.

Modifying Custody and Parenting Time

Custody modifications carry a higher legal bar. Under MCL 722.27(1)(c), a parent must demonstrate proper cause or a change of circumstances before a court will even evaluate whether a custody change is warranted. This threshold was clarified in Vodvarka v Grasmeyer, 259 Mich App 499 (2003), which established that the change must be significant, must have occurred since the last custody order, and must be relevant to the child’s well-being.

“Proper cause” under Vodvarka means an appropriate ground for legal action — a circumstance that is significant enough, and directly relevant enough to the child’s well-being, that the court should revisit the existing arrangement.

If the court finds proper cause or changed circumstances, it evaluates the request under Michigan’s 12 best interest factors in MCL 722.23.

Critically, MCL 722.27(1)(c) is also the statutory hook for the established custodial environment analysis. If an ECE exists, the parent seeking the change must prove by clear and convincing evidence that the modification is in the child’s best interests — a significantly higher standard than the preponderance standard that applies when no ECE exists. This two-step framework — first meeting the threshold, then meeting the burden of proof — is where many custody motions fail.

Common grounds for custody modification include relocation, substance abuse or safety concerns, persistent noncompliance with existing orders, significant changes in a child’s needs, and a parent’s incarceration or extended absence.

Parenting time modifications follow a related but less demanding process under MCL 722.27a. Even parenting-time changes require proper cause or changed circumstances under MCL 722.27(1)(c), but the evidentiary burden and disruption analysis is generally lower than a true custody change. Courts have more flexibility to adjust schedules when the core custodial arrangement remains intact.

Modifying Spousal Support

Spousal support modification is governed by MCL 552.28, which gives courts broad authority to revise support orders when circumstances warrant. However, the court’s ability to modify depends heavily on how the original order was structured.

If your divorce judgment includes specific language that spousal support is “non-modifiable,” the court generally cannot change it — regardless of how dramatically circumstances have shifted. This is one of the most consequential provisions in any divorce settlement.

When modification is permitted, courts consider significant income changes, retirement, cohabitation or remarriage, health changes affecting earning capacity, and the receiving spouse’s progress toward self-sufficiency. One important note: for any divorce finalized after December 31, 2018, spousal support is no longer tax-deductible for the payer and is not taxable income for the recipient.

How to File for a Modification in St. Clair County

The modification process in St. Clair County follows Michigan’s general procedural framework, with the St. Clair County Friend of the Court playing a central role.

In St. Clair County, most support and parenting-time complaints start with the Friend of the Court office in Port Huron. Custody changes typically proceed by motion, with FOC investigation and recommendation depending on the issue. Understanding the local process — and knowing where to start — saves time and avoids procedural missteps.

For child support modifications, you have two paths. You can request a Friend of the Court review, where the FOC evaluates both parents’ current financial circumstances and issues a recommendation — often the faster and less expensive path for straightforward income changes. Alternatively, you can file a formal motion to modify with the circuit court, which is appropriate when issues are contested or complex. Remember: the FOC reviews and recommends, but only the court enters the modified order.

For custody, parenting time, and spousal support modifications, you’ll generally need to file a motion directly with the court.

Gather Your Evidence Before Filing

Regardless of the path, organize your documentation before you take the first step:

Income documentation: Recent pay stubs, tax returns, and W-2s (last two to three years)
Changed circumstances proof: Layoff notices, medical records, relocation evidence, or other documentation of the change
Parenting time logs: Records showing the actual schedule if it has deviated from the court order
Childcare and medical expense records: Receipts and statements — particularly relevant given the 2025 formula changes
Communication records: Texts, emails, or app messages showing co-parenting issues or agreement attempts
School and activity records: Report cards, extracurricular schedules, or other documents showing the child’s current needs

Once a motion is filed, the Friend of the Court may conduct an investigation — particularly for custody and parenting time disputes. The FOC interviews both parents, reviews documentation, and issues a written recommendation to the judge. Either party can object to the FOC recommendation, which triggers a hearing before the judge. If you don’t timely object, the FOC recommendation may become the court’s order.

Why Informal Agreements Aren’t Enough

“Many Michigan residents don’t realize that informal agreements between ex-spouses — even written ones — are not enforceable unless they’re adopted by the court as a modified order.”

If you and your ex agree to change support or parenting time, that agreement needs to be formalized through the court. Otherwise, the original order remains in effect. If it isn’t entered as an order, the court and FOC will enforce the last signed order — and the “agreeing” parent can later demand compliance with the original terms, including back payments.

Common Mistakes That Undermine Modification Requests

“In our experience serving families in Southeast Michigan, the most common modification mistakes happen before anyone steps into a courtroom.”

Stopping payments before the order is changed. Even if you’ve lost your job, the existing order remains in effect until a court modifies it. Unpaid support accrues as arrears, and Michigan courts have powerful enforcement tools — wage garnishment, license suspension, and contempt proceedings.

Failing to act promptly. Under MCL 552.603(2), child support modifications take effect no earlier than the date the motion is filed. If your circumstances changed six months ago but you didn’t file until today, you’re responsible for the original support amount for those six months. Every day of delay can cost you.

Underestimating the custody threshold. Parents sometimes file custody motions based on general dissatisfaction or minor parenting disagreements. Michigan courts apply a rigorous threshold — Vodvarka requires that changed circumstances be significant and directly relevant to the child’s well-being. Filing a weak motion wastes attorney fees and damages credibility with the court.

Not preparing for the Friend of the Court process. The FOC recommendation carries significant weight. Parents who treat the FOC interview casually — or who fail to provide organized documentation — often receive unfavorable recommendations that become difficult to overturn at a hearing.

Frequently Asked Questions About Post-Divorce Modifications in Michigan

How long does a modification take in St. Clair County?

Timelines vary significantly depending on the type of modification. A straightforward child support modification through the Friend of the Court typically takes 30 to 90 days. Contested custody modifications take longer — often four to eight months or more, depending on whether evaluations are ordered and docket conditions. Complex cases involving disputed income or relocation can extend well beyond a year.

Can I modify child support based on the 2025 formula changes alone?

The 2025 formula updates can significantly strengthen a modification argument, but they may not be sufficient on their own. The updates changed how childcare and ordinary medical expenses are calculated, and a recalculation may produce a deviation of 10% or more from your current order. However, child support modification still requires a showing of changed circumstances. When the formula changes are combined with shifts in income, parenting time, childcare expenses, or medical costs, they help build a compelling case. A Friend of the Court review can quickly determine whether your order produces a meaningful deviation under the updated formula.

What if my ex and I agree on the modification?

Even if both parties agree, the modification must be submitted to the court to be enforceable. You can file a stipulated order — a written agreement signed by both parties — with the St. Clair County Circuit Court. For child support, the court verifies the amount complies with the formula or includes appropriate justification for deviation. For custody, the court must confirm the arrangement serves the child’s best interests. Until it’s entered as an order, the court and FOC will enforce only the last signed order.

Can I modify a “non-modifiable” spousal support order?

Generally, no. If your divorce judgment specifically states that spousal support is non-modifiable, Michigan courts will typically enforce that provision as written. Courts have occasionally intervened when enforcement would be truly unconscionable or when there’s evidence of fraud — but these exceptions are rare and not a reliable legal strategy.

Will the court make a modification retroactive?

Michigan courts generally do not make modifications retroactive to before the filing date. Under MCL 552.603(2), child support modifications take effect no earlier than the date of the motion filing. This is well-established Michigan law. Every day you delay filing after circumstances change can cost you.

Do I need an attorney for a modification?

You are not legally required to have an attorney, but modification cases involve legal standards and procedural rules that are difficult to navigate alone. Custody modifications in particular require meeting the Vodvarka threshold, understanding the established custodial environment framework under MCL 722.27(1)(c), and presenting evidence under the 12 best interest factors. The stakes — your children, your finances, your future — are high enough that most families benefit from experienced legal counsel.

Take Control of Your Post-Divorce Future

A divorce order that no longer reflects reality doesn’t protect anyone — not you, not your children, and not your financial future. When circumstances change, Michigan law provides a clear path to modify support, custody, and parenting time. But the process demands proper legal grounds, solid evidence, and timely action.

At Boroja, Bernier & Associates, we help families in Macomb County, Oakland County, Wayne County, St. Clair County, and throughout Southeast Michigan navigate post-divorce modifications with the preparation and precision these cases require. Our family law attorneys understand the legal standards Michigan courts apply, the practical realities of the Friend of the Court process, and the evidence it takes to get results.

To schedule a consultation with the Michigan family law attorneys at Boroja, Bernier & Associates, call our law offices at (586) 991-7611. With our main office in Shelby Township and satellite offices in Troy, Ann Arbor, and Lansing, we’re here to help you move forward with confidence.