Updated June 2026: Corrected the income-change threshold for a child support modification to the statutory 15% figure under Family Court Act § 451 (previously stated as 10%) and clarified that meeting any one of the three independent grounds is enough to obtain a hearing.
Your divorce is finalized, but circumstances have changed significantly. Your ex just lost their job, you received a promotion, or your child's needs have shifted substantially. Can you modify the spousal maintenance, child support, or custody order that you agreed to years ago? In most cases, yes, but only if you meet New York's strict legal standards. This guide explains when and how you can modify court orders after your divorce is final.
The "Substantial Change in Circumstances" Standard
The foundation of all post-divorce modifications in New York is the doctrine of "substantial change in circumstances." Under New York law, you cannot simply ask a court to re-negotiate your divorce settlement because you now think a different arrangement would be better. Instead, you must demonstrate that there has been a significant, unexpected change since the order was issued.
What constitutes a "substantial change"? Courts evaluate whether the change is:
- Substantial: The change is real and material, not a minor or temporary shift in circumstances.
- Significant: The change is substantial enough to make the existing order unjust or inappropriate.
- Involuntary (in some cases): For child support modifications, involuntary income loss carries more weight than voluntary choices.
- Relevant to the order: The change must directly affect the term being modified.
Examples of substantial changes include job loss, involuntary reduced work hours, serious illness or disability, remarriage (for spousal support), significant income increases or decreases, relocation, changes in a child's educational or medical needs, and documented domestic violence or safety concerns affecting custody arrangements.
Modifying Child Custody and Visitation
Modifying a custody order is possible but requires clear and convincing evidence that modification is in the best interests of the child. You must prove both that there has been a substantial change in circumstances and that the proposed change will benefit the child.
Common reasons for custody modifications include one parent's relocation, documented parental unfitness or abuse, a child's expressed preference (if the child is mature enough), significant changes in the child's needs or health, or a parent's inability to provide a safe and stable environment.
To file for a custody modification in New York, you must file a motion with the court that issued the original order: in Western New York, this is typically Erie County Family Court or Erie County Supreme Court. You will be required to present affidavits, testimony, and possibly expert evidence regarding the child’s best interests. Courts consider the same factors they did at the original divorce: the health, safety, and welfare of the child; the fitness of each parent; the child’s preference (if old enough); and the quality of the relationship each parent has with the child.
In emergency situations where a child is at immediate risk of harm, you may seek emergency or temporary custody modifications without waiting for a full hearing. This requires demonstrating imminent danger and filing ex parte (without the other parent present).
Modifying Child Support in New York
Child support modifications are among the most commonly filed motions in family law. New York law provides specific guidelines for when modification is appropriate.
Under the Child Support Standards Act (CSSA) and Family Court Act § 451, a child support order may be modified if any one of three independent grounds is met: a substantial change in circumstances; the passage of three years since the order was last entered, modified, or adjusted; or a change in either parent's gross income of 15% or more since the last order. Meeting just one of these grounds entitles you to a hearing. Courts also weigh the reason for an income change: an involuntary job loss due to company downsizing carries more weight than a voluntary career change or retirement.
The "3-year rule" also applies: even without a specific income change, you may request a modification review every three years from the date of the order. During this review, the court recalculates support based on current income and expenses using the CSSA formula.
Other reasons to seek child support modification include changes in custody (if the non-custodial parent now has more parenting time), a child aging out of the support obligation (typically at age 21 in New York), substantial changes in childcare costs, or the child's enrollment in a private school. When seeking modification, you will need to provide recent tax returns, W-2s, pay stubs, and documentation of the changed circumstances.
Modifying Spousal Maintenance
Spousal maintenance (also called alimony) can be modified on a showing of a substantial change in circumstances under Domestic Relations Law §236(B)(9)(b)(1). The 2015 Maintenance Guidelines Law (L. 2015, ch. 269), effective January 25, 2016, spelled out two situations that count: the payee's remarriage, and the payor's actual retirement, in each case only where the event produces a substantial change in financial circumstances. Retiring on paper does not qualify, and neither does simply reaching a particular birthday.
Only one thing ends maintenance without anyone asking a court: the death of either party. Everything else requires a motion or petition, and the party seeking the change carries the burden of proving it.
Remarriage. Under §248, remarriage is not self-executing. The payor still has to apply to the court on notice. On proof of the remarriage, the court must annul the provisions directing support payments. Until that application is made the obligation continues and arrears keep building, so there is no advantage to waiting.
Cohabitation. This is where most people are wrong about New York law. A new partner moving in does not end maintenance. Section §248 requires habitual cohabitation and a holding out as spouses, and even then the court has discretion to refuse. The Court of Appeals in Graev v. Graev, 11 N.Y.3d 262 (2008), declined to reduce this to a checklist: no single factor, not a shared address, not a shared economic life, not a romantic or sexual relationship, is by itself determinative. What courts look for is a relationship resembling or suggestive of marriage.
The Fourth Department, which covers Erie County, applied that standard in Kelly v. Kelly, 2019 NY Slip Op 01964 (4th Dep't 2019), on appeal from Supreme Court, Erie County. The payee and the man she lived with testified they were friends and landlord and tenant. The appellate court looked at the rest of the record: they had met on a dating website, she moved directly from the marital residence into his home, a sexual relationship followed, they vacationed together and sometimes shared a room, she wore a diamond ring on her left hand that he had bought, and their finances were tangled in ways neither had reported on a tax return. The Fourth Department reversed the trial court, held the payor had met his burden by a preponderance of the evidence, and granted the application to terminate.
Two practical lessons come out of Kelly. Cohabitation cases are proved with documents and daily details rather than with the labels the parties put on the relationship. And the case turned in part on the parties' own agreement, which tied termination to a judicial finding of cohabitation pursuant to Domestic Relations Law §248. Your agreement's wording can set a different trigger than the statute does, and it is worth reading before anyone files anything.
If your maintenance came from an agreement rather than a court decision. Most Western New York divorces resolve by a settlement agreement that is incorporated into the judgment but does not merge with it. That agreement survives as a contract, and courts are markedly more reluctant to rewrite a contract than to revisit their own order. If the agreement states that maintenance is non-modifiable, the amount and duration are generally fixed regardless of what happens later, subject to narrow exceptions such as extreme hardship. Read the maintenance and termination paragraphs of your agreement before you assume a change is available. Our spousal support page covers how these provisions get negotiated in the first place, and we handle modification applications for clients throughout Erie County and Buffalo.
How Long Does a Modification Take?
The timeline for a post-divorce modification varies depending on whether the other party agrees to the modification. If both parties agree on the change, an uncontested modification can typically be finalized in a few weeks to a couple of months. You and your ex can submit a stipulation (written agreement) to the court, and a judge will review and approve it if it appears fair and in the best interests of any children.
A contested modification, where your ex opposes the request, takes longer. You will need to schedule a hearing, present evidence, and allow the other party to respond. Contested modifications often take several months to a year or more, depending on court schedules and case complexity.
Do I Need an Attorney to Modify a Court Order?
While you are legally permitted to file a modification motion pro se (without an attorney), doing so is risky. Procedural errors, incomplete documentation, or weak presentation of evidence can result in your modification being denied. Moreover, if you misunderstand the law or fail to present your case effectively, you may lose income, custody time, or financial support to which you are legally entitled.
An experienced family law attorney can help you gather the necessary documentation, demonstrate the substantial change in circumstances, prepare affidavits and testimony, and advocate for your position during negotiation or trial. At Weinrieb Law, we handle modification petitions regularly in Erie County courts and know how local judges evaluate these cases. If a modification is in your favor, the investment in an attorney typically pays for itself many times over in the long run.
Frequently Asked Questions
How much does my income need to change to modify child support in New York?
Under New York's Child Support Standards Act and Family Court Act § 451, a modification may be warranted if there is a change in either parent's gross income of 15% or more from the last order: one of three independent grounds, alongside a substantial change in circumstances and the passage of three years since the last order. Courts also consider the nature and reason for the income change and the current financial circumstances of both parents. An involuntary income loss typically carries more weight than a voluntary choice to reduce work hours or change careers.
Can I modify a custody order if my ex won't follow it?
If your ex is violating a custody order, you should first document the violations and attempt to resolve the matter informally. If informal resolution fails, you can file a motion to enforce the existing order or seek modification if there has been a substantial change in circumstances affecting the child's best interests. Enforcement motions are separate from modification motions and have different legal standards.
What happens if my ex refuses to agree to a modification?
If your ex refuses to agree to a modification, you will need to file a motion with the court. The court will schedule a hearing where both parties can present evidence. If you can prove a substantial change in circumstances that affects the original order, the court may order the modification even without your ex's consent.
Can I modify a separation agreement that was incorporated into my divorce decree?
Yes, you can seek modification of a separation agreement that was incorporated into your divorce decree, but you must show a substantial change in circumstances since the agreement was made. Agreements that were not merged (incorporated) into the decree may have somewhat different modification standards and may require arbitration if that was agreed upon.
Does moving out of New York affect my ability to modify a court order?
If you relocate out of New York, you may still seek modification if New York is the home state of the child or if New York retains jurisdiction under the Uniform Child Custody Jurisdiction and Enforcement Act (UCCJEA). Relocation itself can constitute a substantial change in circumstances affecting custody and support. Consult with an attorney about jurisdictional issues if you plan to move.
Does my ex's new partner moving in end my alimony in New York?
Not by itself. Domestic Relations Law §248 requires two things: that the payee is habitually living with another person, and that the payee is holding himself or herself out as that person's spouse. Even then the court has discretion rather than an obligation to terminate. In Graev v. Graev, 11 N.Y.3d 262 (2008), the Court of Appeals refused to treat any single factor as decisive and asked instead whether the relationship resembles or is suggestive of marriage. The Fourth Department granted termination on those facts in Kelly v. Kelly, 2019 NY Slip Op 01964 (4th Dep't 2019), an Erie County appeal, applying a preponderance of the evidence standard.
Does retiring end my spousal maintenance obligation in New York?
Not automatically, and not on a birthday. Domestic Relations Law §236(B)(9)(b)(1) treats the payor's actual retirement as a ground for modification only where the retirement results in a substantial change in financial circumstances. You still have to apply to the court, and the court still weighs whether the retirement was reasonable and made in good faith rather than timed to defeat the obligation.
Can I change maintenance that was set by our settlement agreement rather than by a judge?
It is considerably harder. A settlement agreement that is incorporated into the judgment but not merged into it survives as an independent contract, and courts are reluctant to rewrite contracts. If the agreement says maintenance is non-modifiable, the amount and duration are generally fixed regardless of later changes, subject to narrow exceptions such as extreme hardship. Start by reading the maintenance and termination paragraphs of your own agreement, because they may set different triggers than the statute does.