How to Modify Child Support in New York
Reviewed by DocDraft Legal Team · New York · Last updated September 21, 2026
In New York, a child support modification is a court or agency changing the amount of an existing child support order after circumstances change, and unlike California, New York gives you a quantified test to qualify. You can ask the court when there has been a substantial change in circumstances, when three years have passed since the order was entered, last modified, or adjusted, or when either parent's gross income has changed by fifteen percent or more (Family Court Act 451). Child support in New York follows a statewide guideline tied to both parents' income and the number of children, so a job loss, a raise, or a new custody arrangement can make the current amount too high or too low. You have two paths. You can file a Petition for Modification of an Order of Support (Form 4-11) in the Family Court that handles your case, or, if the Support Collection Unit administers your order, that unit can apply a cost of living adjustment about every two years when the cost of living has risen ten percent or more (Family Court Act 413-a). A change takes effect only back to the date you file your petition, not to when your circumstances changed, so support that already came due generally cannot be reduced (Family Court Act 449). Keep paying your current order until it is changed. Attorney review of your filing is available through DocDraft.
Find out where you stand in New York
Where are you with changing your child support order?
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How do I modify child support in New York?
File a Petition for Modification of an Order of Support (Form 4-11) in the Family Court that issued your order, or ask the Support Collection Unit if it administers your case. You must show a substantial change, three years passing, or a fifteen percent change in either parent's gross income (Family Court Act 451).
How much does income have to change to modify child support in New York?
New York sets a quantified trigger: you can seek a modification when either parent's gross income has changed by fifteen percent or more since the order was entered, last modified, or adjusted (Family Court Act 451). Three years passing since the order, or another substantial change in circumstances, also qualifies you to ask.
How far back can a child support change go in New York?
A modification takes effect only back to the date you file your petition, not to when your circumstances changed (Family Court Act 449). Support that already came due generally cannot be reduced, so filing promptly protects you. Keep paying the current order until the court changes it.
Which court or agency handles child support modifications in New York?
The Family Court in the county where your order is filed handles modification petitions. If the Support Collection Unit administers your order, it can also apply a cost of living adjustment about every two years when the cost of living has risen ten percent or more (Family Court Act 413-a), without a court hearing.
New York child support modification at a glance
In New York, a child support modification is a court or agency changing an existing order, and you can seek one when there is a substantial change, when three years have passed since the order, or when either parent's gross income has changed by fifteen percent or more (Family Court Act 451). Support follows a statewide guideline tied to both parents' income and the number of children, so a change in earnings or custody can justify a new amount. You file a Petition for Modification of an Order of Support (Form 4-11) in Family Court, or the Support Collection Unit can apply a cost of living adjustment about every two years when the cost of living has risen ten percent or more (Family Court Act 413-a). A change applies back only to the date you file, so support that already came due cannot be reduced (Family Court Act 449).
Lowering a New York order after an income drop
Suppose your income just dropped and you want to know if New York's fifteen percent test lets you ask for a lower order. You compare your current gross income with what it was when the order was entered; if it fell by fifteen percent or more, or three years have passed, you qualify to petition (Family Court Act 451). You complete a Petition for Modification of an Order of Support (Form 4-11) with proof of your lower pay and file it in Family Court. Because a change applies back only to your filing date (Family Court Act 449), you file right away and keep paying the current amount until the Support Magistrate rules. A reduction is considered only if your income loss was involuntary. Attorney review of your filing is available through DocDraft.
Relevant Laws
Family Court Act 451 (modification of a support order)
Lets a court modify a child support order on a showing of a substantial change in circumstances, or where three years have passed since the order was entered, last modified, or adjusted, or either party's gross income has changed by fifteen percent or more. The parallel matrimonial provision is Domestic Relations Law 236(B)(9)(b).
Family Court Act 449 (effective date of a support order)
Provides that an order of support is effective as of the date of the filing of the petition, so a modification reaches back only to your filing date and cannot erase support that already came due before you filed.
Family Court Act 413-a (cost of living adjustment)
Authorizes the Support Collection Unit to apply a cost of living adjustment to an order no earlier than twenty-four months after it was issued, last modified, or last adjusted, when the annual average change in the CPI-U is ten percent or greater, without a court hearing unless a parent objects.
New York Child Support Services: Modify Order
The state child support program's self-help page explains how to request a review or modification, the fifteen percent gross income and three year grounds, and how the every-two-year cost of living adjustment works for orders the Support Collection Unit administers.
Regional Variances
New York child support modification rules at a glance
Qualifying threshold
A substantial change in circumstances, three years since the order was entered, last modified, or adjusted, or a fifteen percent change in either parent's gross income (Family Court Act 451). A reduction in income counts only if it was involuntary.
Where to file
The Family Court in the county where your existing order is filed. If the Support Collection Unit administers your order, it can also review it and apply a cost of living adjustment without a full court hearing.
Modification form
Petition for Modification of an Order of Support, General Form 4-11, filed in Family Court. The form is available free through the New York State courts website.
Retroactivity
A modification is effective back only to the date you file your petition (Family Court Act 449). Support that already came due before filing generally cannot be reduced.
Periodic review
The Support Collection Unit reviews orders it administers about every two years for a cost of living adjustment (Family Court Act 413-a), and federal rules let IV-D cases request a review roughly every three years.
Suggested Compliance Checklist
Confirm you meet a modification ground
Before you file days after startingCheck whether three years have passed, either parent's gross income changed by fifteen percent or more, or another substantial change occurred (Family Court Act 451). Gather pay stubs and tax returns as proof. Attorney review of your filing is available through DocDraft.
Estimate the new guideline amount
Before you file days after startingUse New York's Child Support Standards Chart and both parents' current income to estimate what support would be now, so you can show the court why the existing amount is too high or too low.
Complete the modification petition (Form 4-11)
As soon as your circumstances change days after startingFill out the Petition for Modification of an Order of Support, General Form 4-11, describing the changed circumstances and the amount you seek. Use the free form and instructions from the New York State courts website.
File your petition in Family Court
Promptly (the change dates back to filing) days after startingFile your Form 4-11 with the Family Court clerk handling your case. There is generally no filing fee. Because a change applies back only to your filing date, file promptly (Family Court Act 449).
Serve the other parent
Before the return date days after startingMake sure the other parent is served with your petition and the return date through the court's process. Proper service is required before a Support Magistrate can change your order.
Attend the hearing and get the new order
On your return date days after startingAppear before the Support Magistrate with your income proof, let the magistrate recalculate support under the guideline, and get the signed order effective back to your filing date. Keep paying the current order until then.
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Confirm you meet a modification ground | Check whether three years have passed, either parent's gross income changed by fifteen percent or more, or another substantial change occurred (Family Court Act 451). Gather pay stubs and tax returns as proof. Attorney review of your filing is available through DocDraft. | - | Before you file |
| Estimate the new guideline amount | Use New York's Child Support Standards Chart and both parents' current income to estimate what support would be now, so you can show the court why the existing amount is too high or too low. | - | Before you file |
| Complete the modification petition (Form 4-11) | Fill out the Petition for Modification of an Order of Support, General Form 4-11, describing the changed circumstances and the amount you seek. Use the free form and instructions from the New York State courts website. | - | As soon as your circumstances change |
| File your petition in Family Court | File your Form 4-11 with the Family Court clerk handling your case. There is generally no filing fee. Because a change applies back only to your filing date, file promptly (Family Court Act 449). | - | Promptly (the change dates back to filing) |
| Serve the other parent | Make sure the other parent is served with your petition and the return date through the court's process. Proper service is required before a Support Magistrate can change your order. | - | Before the return date |
| Attend the hearing and get the new order | Appear before the Support Magistrate with your income proof, let the magistrate recalculate support under the guideline, and get the signed order effective back to your filing date. Keep paying the current order until then. | - | On your return date |
Frequently Asked Questions
A real, involuntary income loss can support a modification, especially if your gross income dropped by fifteen percent or more since the order (Family Court Act 451). You must file Form 4-11 to change the amount; support keeps accruing at the old rate until the court acts. Do not simply stop paying.
No. Either parent can file a Petition for Modification of an Order of Support on their own, and the other parent is served and can respond. If both parents agree on a new amount, they can present a stipulation for the Support Magistrate to review against the state guideline.
After you file Form 4-11, the Family Court sets a return date, often several weeks out, and a Support Magistrate hears the case. A cost of living adjustment through the Support Collection Unit can be faster. Because a change dates back only to filing, filing promptly protects you (Family Court Act 449).
The Support Collection Unit reviews orders it administers about every two years and applies a cost of living adjustment when the cost of living has risen ten percent or more since the order was made or last reviewed (Family Court Act 413-a). Either parent can object and ask for a full review.
A modification changes support only from your filing date forward (Family Court Act 449). Support that already came due, called arrears, generally cannot be reduced or erased, and unpaid amounts continue to accrue. Keep paying your current order to avoid building arrears while your petition is pending.
There is generally no filing fee to bring a support modification petition in New York Family Court, so cost is rarely a barrier to asking. A cost of living adjustment handled by the Support Collection Unit also does not charge you a fee to request or receive it.
You can petition whenever a substantial change in circumstances occurs, and three years after the order or a fifteen percent income change gives you an independent ground (Family Court Act 451). Separately, the Support Collection Unit reviews orders it administers for a cost of living adjustment about every two years.
A Support Magistrate in Family Court hears modification petitions and signs the new order after recalculating support under the state guideline. If the Support Collection Unit administers your order, it can apply a cost of living adjustment without a court hearing, though either parent may object and request a hearing.
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