How to Modify Child Support in New Jersey
Reviewed by DocDraft Legal Team · New Jersey · Last updated September 21, 2026
In New Jersey, a child support modification is a court or agency changing the amount of an existing child support order after a real change in circumstances, and unlike states that set a fixed percentage, New Jersey uses the changed circumstances standard from Lepis v. Lepis, rooted in N.J.S.A. 2A:34-23. Child support in New Jersey follows a statewide guideline tied to each parent's income and parenting time, so a substantial and lasting change, such as a job loss, a large income shift, or a change in the children's needs, can make the current amount too high or too low. You can ask for a change in two ways. You can file the Family Multi-Purpose Post-Judgment Motion Packet (CN 10483) with the Superior Court, Family Part that handles your case, or, if the Probation Family Division services your case, you can use its periodic reviews. New Jersey runs an automatic cost of living adjustment about every two years and lets parties in a Title IV-D case request a review about every three years. A change takes effect only back to the date your notice of motion was mailed or filed, so support that already came due generally cannot be reduced (N.J.S.A. 2A:17-56.23a). Keep paying your current order until the court changes it. Attorney review of your filing is available through DocDraft.
Find out where you stand in New Jersey
Where are you with changing your child support order?
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How do I modify child support in New Jersey?
File the Family Multi-Purpose Post-Judgment Motion Packet (CN 10483) with the Superior Court, Family Part that issued your order, and show a substantial change in circumstances since the last order under the Lepis v. Lepis standard (N.J.S.A. 2A:34-23). You serve the other parent and attend a motion hearing.
How much does income have to change to modify child support in New Jersey?
New Jersey sets no fixed percentage or dollar trigger for a court motion; you must show a substantial, permanent change in circumstances since the last order (N.J.S.A. 2A:34-23). Separately, the Probation Division runs an automatic cost of living adjustment about every two years based on the Consumer Price Index.
How far back can a child support change go in New Jersey?
A modification can reach back only to the date your notice of motion was mailed or filed, not to when your circumstances changed (N.J.S.A. 2A:17-56.23a). Support that already came due generally cannot be reduced, so filing promptly protects you. Keep paying the current order until a judge changes it.
Which court handles child support modifications in New Jersey?
The Superior Court, Family Part in the county handling your existing order decides modifications. If the Probation Division services your case, it also runs periodic reviews, an automatic cost of living adjustment about every two years and a three-year review for Title IV-D cases, and can bring changes to the court.
New Jersey child support modification at a glance
In New Jersey, you can change an existing child support order by showing a substantial and permanent change in circumstances since the order was made, the standard from Lepis v. Lepis rooted in N.J.S.A. 2A:34-23, because the state sets no fixed percentage trigger. Support follows a statewide guideline tied to income and parenting time, so a job loss, a large income change, or a change in the children's needs can justify a new amount. You file the Family Multi-Purpose Post-Judgment Motion Packet (CN 10483) with the Superior Court, Family Part, or use the Probation Division's periodic reviews if it services your case. The state also runs an automatic cost of living adjustment about every two years. A change applies back only to the date your notice of motion was mailed or filed, so support that already came due generally cannot be reduced (N.J.S.A. 2A:17-56.23a).
Lowering a New Jersey order after a pay cut
Suppose your hours were just cut and your New Jersey order was set two years ago; because New Jersey requires a substantial, permanent change in circumstances rather than a fixed percentage, you complete the Family Multi-Purpose Post-Judgment Motion Packet (CN 10483) with a current Case Information Statement showing your lower pay, and file it with the Superior Court, Family Part that issued your order. You serve the other parent and get a motion date. Because a change reaches back only to the date your notice of motion was mailed or filed (N.J.S.A. 2A:17-56.23a), you file right away and keep paying the current amount until the judge rules. At the hearing the judge recalculates support under the guideline and can sign a lower order effective from your filing date. Attorney review of your filing is available through DocDraft.
Relevant Laws
N.J.S.A. 2A:34-23 (modification of a support order)
Authorizes the court to make and revise orders for the maintenance of the children as the circumstances of the parties and the nature of the case render fit, reasonable, and just, and is the statutory basis for the Lepis v. Lepis changed circumstances standard used to modify child support in New Jersey.
N.J.S.A. 2A:17-56.23a (retroactive modification barred)
Provides that no payment or installment of a child support order shall be retroactively modified by the court except from the date the notice of motion was mailed, so a change cannot reach support that already came due, which makes the filing date decisive.
New Jersey Courts self-help: change a court order
The New Jersey Judiciary self-help center explains how to ask the Family Part to change a child support order, which motion packet to use, how to serve the other parent, and how the Probation Division cost of living adjustment and three-year review work.
Family Multi-Purpose Post-Judgment Motion Packet (CN 10483)
The statewide form set for asking the Superior Court, Family Part to change an existing order, including increasing or decreasing child support, with a Notice of Motion, a certification, a proposed order, and a Case Information Statement.
Regional Variances
New Jersey child support modification rules at a glance
Qualifying threshold
New Jersey sets no fixed percentage or dollar trigger for a court motion; you show a substantial and permanent change in circumstances since the last order under the Lepis v. Lepis standard (N.J.S.A. 2A:34-23). The Probation Division also runs an automatic cost of living adjustment about every two years.
Where to file
The Superior Court, Family Part in the county handling your existing order. If the Probation Division services your case, it runs periodic reviews and can bring a recalculated amount to the court without a full motion by you.
Modification form
The Family Multi-Purpose Post-Judgment Motion Packet (CN 10483), which includes a Notice of Motion, a certification, and a proposed order, plus a current Case Information Statement. The packet is free through the New Jersey Courts self-help site.
Retroactivity
A modification can date back only to the date your notice of motion was mailed or filed, not to when circumstances changed (N.J.S.A. 2A:17-56.23a). Support that already came due generally cannot be reduced and remains enforceable as a judgment.
Periodic review
The Probation Division runs an automatic cost of living adjustment about every two years, and parties in a Title IV-D case can request a review about every three years without showing a change, under federal rules.
Suggested Compliance Checklist
Gather proof of your changed circumstances
Before you file days after startingCollect current pay stubs, tax returns, and proof of the change (job loss, income change, or a change in the children's needs), and estimate the new guideline amount. Attorney review of your filing is available through DocDraft.
Complete the CN 10483 motion packet
As soon as your circumstances change days after startingFill out the Family Multi-Purpose Post-Judgment Motion Packet (CN 10483), including a Notice of Motion, a certification explaining the change, and a proposed order, and attach a current Case Information Statement. Use the free New Jersey Courts self-help forms and instructions.
File with the Superior Court, Family Part
Promptly (the change dates back to filing) days after startingFile your CN 10483 packet with the Superior Court, Family Part and pay the 50 dollar motion fee, or request a fee waiver. Because a change applies back only to the date your notice of motion was mailed or filed, file promptly (N.J.S.A. 2A:17-56.23a).
Serve the other parent
Before the motion deadline days after startingServe the other parent with your filed papers, then file proof of service. Confirm the exact motion date, filing, and service deadlines with the Family Division in your county, because proper and timely service is required for the judge to change the order.
Consider a Probation Division review
Anytime the Probation Division services your case days after startingIf the Probation Division services your case, ask about its periodic reviews. It runs an automatic cost of living adjustment about every two years, and parties in a Title IV-D case can request a three-year review without proving changed circumstances.
Attend the motion hearing and get the new order
On your motion date days after startingGo to the hearing with your income proof, let the judge recalculate support under the guideline, and get the signed order effective back to your filing date. Keep paying the current order until the judge changes it.
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Gather proof of your changed circumstances | Collect current pay stubs, tax returns, and proof of the change (job loss, income change, or a change in the children's needs), and estimate the new guideline amount. Attorney review of your filing is available through DocDraft. | - | Before you file |
| Complete the CN 10483 motion packet | Fill out the Family Multi-Purpose Post-Judgment Motion Packet (CN 10483), including a Notice of Motion, a certification explaining the change, and a proposed order, and attach a current Case Information Statement. Use the free New Jersey Courts self-help forms and instructions. | - | As soon as your circumstances change |
| File with the Superior Court, Family Part | File your CN 10483 packet with the Superior Court, Family Part and pay the 50 dollar motion fee, or request a fee waiver. Because a change applies back only to the date your notice of motion was mailed or filed, file promptly (N.J.S.A. 2A:17-56.23a). | - | Promptly (the change dates back to filing) |
| Serve the other parent | Serve the other parent with your filed papers, then file proof of service. Confirm the exact motion date, filing, and service deadlines with the Family Division in your county, because proper and timely service is required for the judge to change the order. | - | Before the motion deadline |
| Consider a Probation Division review | If the Probation Division services your case, ask about its periodic reviews. It runs an automatic cost of living adjustment about every two years, and parties in a Title IV-D case can request a three-year review without proving changed circumstances. | - | Anytime the Probation Division services your case |
| Attend the motion hearing and get the new order | Go to the hearing with your income proof, let the judge recalculate support under the guideline, and get the signed order effective back to your filing date. Keep paying the current order until the judge changes it. | - | On your motion date |
Frequently Asked Questions
A real, involuntary income drop can support a modification, but you must file a motion to change the amount; support keeps accruing at the old rate until the court acts (N.J.S.A. 2A:17-56.23a). A judge may weigh whether you are earning what you reasonably could. Do not simply stop paying.
No. Either parent can file the CN 10483 motion packet on their own, and the other parent is served and can respond. If both parents agree on a new amount, they can submit a written consent order for a judge to approve, and the judge still checks it against the guideline.
After you file the CN 10483 packet, the court sets a motion date, often several weeks out depending on your county. An uncontested change or a Probation Division review can be faster. Because a change dates back only to when your notice of motion was mailed or filed, filing promptly protects you.
Yes. If the Probation Division services your case, it runs an automatic cost of living adjustment about every two years and a three-year review for Title IV-D cases, recalculating support under the guideline. If the recalculated amount differs substantially from your current order, it can bring the change to the court.
You can file a motion whenever a substantial and permanent change in circumstances occurs. If the Probation Division services your case, you can generally request a review about every three years even without a change, and an automatic cost of living adjustment runs about every two years.
A modification changes support only from the date your notice of motion was mailed or filed (N.J.S.A. 2A:17-56.23a). Support that already came due, called arrears, generally cannot be reduced or erased and remains enforceable as a judgment. Keep paying your current order to avoid building arrears while your motion is pending.
Filing the CN 10483 motion packet in the Superior Court, Family Part carries a 50 dollar motion filing fee, but you can ask the court to waive it if you cannot afford it. A review through the Probation Division does not charge you a separate motion fee.
You file the Family Multi-Purpose Post-Judgment Motion Packet (CN 10483), which includes a Notice of Motion, a certification explaining the change, and a proposed order, and you attach a current Case Information Statement. The New Jersey Courts self-help website provides this packet and instructions at no charge.
Other New Jersey guides
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