How to Fill Out New Jersey Form CN-10474 (w/Examples) + FAQs

New Jersey Form CN-10474 is the Notice of Motion to Modify or Terminate Alimony and/or Child Support packet published by the New Jersey Judiciary, and any divorced or separated parent or former spouse who wants a Family Part judge to change, suspend, or end an existing alimony or child support order must file it. The form lives inside the post-judgment motion process under Rule 5:5-4 and is built around the changed circumstances standard set in Lepis v. Lepis, 83 N.J. 139 (1980).

The current revision date stamped on the official packet is Revised 09/2024, and you should always pull the latest copy from the New Jersey Courts forms library before filing. According to the New Jersey Judiciary’s most recent Family Practice statistics, the Family Part processed more than 74,000 post-judgment motions in fiscal year 2024, and the Administrative Office of the Courts reports that roughly 1 in 3 self-represented motions are returned for deficiencies on the first pass — most often a missing Case Information Statement or an unsigned certification.

Here is what you will learn in this guide:

  • 📄 What every box, certification, and signature line on CN-10474 means in plain English
  • 💵 The exact filing fee, payment methods, and the three filing channels available in 2026
  • ⚖️ How to prove “changed circumstances” the way Lepis and Crews v. Crews require
  • 📝 Three full filled-out scenarios using real-world fact patterns
  • 🚫 The 12 most common mistakes that trigger a denial or a rejected filing

What the Form Is and Who Must File It

Form CN-10474 is the official Notice of Motion packet used in the Superior Court of New Jersey, Chancery Division, Family Part, when a moving party asks the judge to modify or terminate alimony, child support, or both. The packet is published and maintained by the New Jersey Administrative Office of the Courts and is filed in the county where the underlying divorce or support order was entered. The legal foundation for the relief requested sits in N.J.S.A. 2A:34-23 for alimony and N.J.S.A. 2A:17-56.9a for child support emancipation review.

You must file CN-10474 if you are the obligor (the person paying) and your income has dropped, you have retired, or your child is emancipated. You also file it if you are the obligee (the person receiving) and you believe the payor’s income has gone up, your child’s needs have increased, or your former spouse is now cohabiting under N.J.S.A. 2A:34-23(n). Attorneys file it on behalf of clients, but pro se filers — people without a lawyer — make up the majority of CN-10474 filings statewide.

The form itself is a packet, not a single page. It contains the Notice of Motion, a Certification in Support, a proposed Order, and a Confidential Litigant Information Sheet. Each piece must be completed, signed, and filed together, or the Family Division clerk will reject the filing as incomplete.

The consequence of skipping the form and simply not paying is severe. Probation will continue to enforce the existing order, arrears will accrue, your driver’s license can be suspended under N.J.S.A. 2A:17-56.41, and a bench warrant can issue. A common misconception is that an oral agreement between the parties stops the clock — it does not. Only a signed court order modifies a support obligation.


Before You Start: Documents and Information You Need

Gather everything below before you open the packet. Filing without these attachments is the single most common reason a motion is denied without prejudice. The official post-judgment motion checklist from the Judiciary echoes this list.

  • The current support order. You need the most recent order setting the amount you want changed. Without it, the judge cannot identify the baseline. Missing it usually triggers a same-day rejection by the clerk.
  • A new Case Information Statement (CIS), Form CN-10487. Required by Rule 5:5-4(a)(2) for every alimony or child support modification. The court compares your new CIS to the one filed at divorce.
  • The CIS filed at the time of the original order. The Lepis comparison is impossible without this prior CIS, and the judge will deny the motion if it is missing.
  • Three most recent pay stubs. These prove current gross and net income. Without them the court cannot verify the income figure on your CIS.
  • Your last two federal tax returns with all schedules and W-2s. Required to show year-over-year change. Filing only Form 1040 without schedules is a frequent deficiency.
  • Proof of the changed circumstance. A termination letter, retirement paperwork, medical records, the child’s diploma, or surveillance/cohabitation evidence. No proof equals no prima facie case.
  • The docket number (FM-XX-XXXXXX-XX). Found on every prior order. The clerk cannot index the motion without it.
  • The other party’s last known address. You must serve them under Rule 1:5-2, and bad service kills the motion.
  • A self-addressed stamped envelope if you are filing by mail and want a stamped copy returned.
  • The $50 filing fee in the form of a check, money order, or credit card authorization for JEDS.

A misconception worth correcting: many filers think a verbal job loss explanation is enough. It is not. The judge applies the prima facie standard from Lepis, which demands documentary proof attached to the certification.


Where to Get the Form and How to Access It

The official packet is hosted on the New Jersey Judiciary’s self-help portal. Download it directly from the Modify or Terminate Alimony/Child Support page so you receive the version stamped Revised 09/2024. The packet is a fillable PDF that opens in Adobe Acrobat Reader; the free version is enough.

You can also request a paper copy at the Family Division Intake Office in the county where your case was decided. Each of New Jersey’s 15 vicinages keeps printed packets at the courthouse — for example, the Bergen County Family Division in Hackensack and the Essex County Family Division in Newark. Self-help centers can hand you the packet but cannot give legal advice.

A third route is through Legal Services of New Jersey, which posts a free annotated version with line-by-line tips for low-income filers. Their version is the same form, just with explanatory notes.

A common misconception is that downloading an older PDF you saved last year is fine. It is not. The Judiciary updates field labels, fee amounts, and certification language. Filing a superseded version of CN-10474 will get the packet bounced by the clerk under Rule 1:5-6.

If you have a disability that prevents you from completing the PDF, the ADA Coordinator in your vicinage can provide an accessible version, a scribe, or assistive technology. Filers who do not know the form exists often default to writing letters to the judge, which the court will not accept under Rule 1:6-2.


Step-by-Step: How to Fill Out Form CN-10474 Line by Line

The packet has four parts: the Notice of Motion, the Certification in Support, the Proposed Order, and the Confidential Litigant Information Sheet. Work through each part in the order printed on the form. The instructions below mirror the Revised 09/2024 PDF.

Part 1: Caption Block (Top of Page 1)

The caption block sits at the top of every page in the packet and tells the court who is suing whom and where.

Plain English: This is the heading that names the parties, the court, and the docket number. It must match the original divorce judgment exactly.

How to answer: Type the plaintiff’s full legal name on the left, the defendant’s full legal name on the right, the county above “SUPERIOR COURT OF NEW JERSEY,” and the docket number (FM-XX-XXXXXX-XX) in the box on the right. Use ALL CAPS for the parties’ names because that is the Judiciary’s stylebook standard.

Example: MARIA L. GONZALEZ, Plaintiff, v. DAVID R. GONZALEZ, Defendant, Docket No. FM-02-001234-19, Bergen County.

Nuance: If your name has changed since the divorce, use the name on the original judgment, not your current legal name. Add an a/k/a line if needed.

Common mistake and consequence: Filers list their current name instead of the name on the divorce judgment, which causes the clerk to bounce the motion because the caption no longer matches the docket.

Misconception: People think the caption is just decorative. It is not — it is the legal identity of the case, and judges read it first.

Part 2: Notice of Motion (Page 1)

Plain English: The Notice of Motion tells the other side a motion is being filed and tells the court what you are asking for.

How to answer: Check the boxes for Modify Alimony, Terminate Alimony, Modify Child Support, or Terminate Child Support — whichever applies. Fill in the return date (the Friday at least 24 days from the date you mail or e-file under R. 1:6-3). Sign and date the bottom.

Example: David Gonzalez checks “Modify Child Support” and writes the return date of 06/19/2026, then signs his name on 05/22/2026.

Nuance: If you want oral argument, check the Request for Oral Argument box. Family Part judges grant oral argument liberally on support motions but not automatically.

Common mistake and consequence: Filers pick a return date less than 24 days out, and the clerk reschedules the motion to the next available cycle, delaying relief by a full month.

Misconception: People think the return date is the hearing date. In Family Part it is usually the decision date — most support motions are decided on the papers unless oral argument is granted.

Part 3: Certification in Support of Motion (Pages 2–4)

Plain English: This is your sworn statement explaining why the order should change.

How to answer: Number every paragraph. Begin with identifying paragraphs (who you are, the date of the divorce, the current order). Then describe the changed circumstance with dates, dollar amounts, and attachments. Cite Lepis by name in the legal-argument paragraph. Finish with the verification line “I certify that the foregoing statements made by me are true. I am aware that if any of the foregoing statements made by me are willfully false, I am subject to punishment.” — that exact language is required by Rule 1:4-4(b).

Example: Maria writes, “5. On March 3, 2026, I was laid off from Acme Logistics in Teterboro. My gross monthly income dropped from $7,400 to $2,150 in unemployment benefits. See Exhibit B.”

Nuance: If the changed circumstance is cohabitation, attach photos, social media posts, or a private investigator’s report and cite Konzelman v. Konzelman, 158 N.J. 185 (1999).

Common mistake and consequence: Filers write narrative paragraphs without dates or numbers, and the judge denies the motion for failure to make a prima facie case.

Misconception: People believe they can write the certification as if speaking to the judge in person. The court treats it as sworn testimony, so vague or emotional language hurts credibility.

Part 4: Statement of Previous and Current Support Amounts

Plain English: A simple grid that compares the old support number to the new one you propose.

How to answer: Enter the current weekly or monthly support amount, the date of the order setting it, the proposed new amount, and the proposed effective date.

Example: Current child support: $312/week, set 04/12/2019. Proposed: $145/week, effective 04/01/2026.

Nuance: The effective date can be the date the motion was filed, not the date of the layoff, under Mallamo v. Mallamo, 280 N.J. Super. 8 (App. Div. 1995).

Common mistake and consequence: Filers ask for retroactive modification before the filing date, which is barred by N.J.S.A. 2A:17-56.23a, and the judge limits relief automatically.

Misconception: People think arrears can be wiped out. Accrued child support arrears are vested and cannot be retroactively reduced.

Part 5: Case Information Statement Attachment (Form CN-10487)

Plain English: A complete financial snapshot — income, expenses, assets, and debts.

How to answer: Use the Family Part CIS, Form CN-10487. Complete every section: Part A (case info), Part B (gross income), Part C (expenses), Part D (assets), Part E (liabilities). Attach pay stubs and tax returns at the back.

Example: David lists $4,950 monthly Schedule A shelter expenses, $2,100 Schedule B transportation, and $3,400 Schedule C personal.

Nuance: If you have self-employment income, attach Schedule C from your tax return and a year-to-date profit and loss statement.

Common mistake and consequence: Filers leave Part D (assets) blank because “nothing changed.” Blank fields read as hidden information, and judges sometimes draw a negative inference under Rule 5:5-2.

Misconception: People think the CIS is optional on a “small” modification. It is not — R. 5:5-4(a)(2) requires it on every support modification motion.

Part 6: Proposed Order

Plain English: A draft of the order you want the judge to sign.

How to answer: Title it Order on Motion to Modify [Alimony/Child Support], list each request as a numbered “ORDERED” paragraph, and leave the judge’s signature block blank.

Example: “1. Defendant’s child support obligation is reduced from $312 per week to $145 per week, effective 04/01/2026.”

Nuance: Add a paragraph directing the New Jersey Probation Child Support Enforcement unit to recalculate arrears and update the wage withholding.

Common mistake and consequence: Filers omit the Probation directive, and the new order does not flow to the wage execution, so old amounts keep coming out of the paycheck.

Misconception: People think the judge writes the order. In Family Part the moving party drafts it, and the judge signs (or modifies) what is presented.

Part 7: Confidential Litigant Information Sheet (CLIS)

Plain English: A separate sheet collecting Social Security numbers, dates of birth, and driver’s license numbers that the court keeps off the public record.

How to answer: Complete every field on the CLIS, Form CN-11268 for both parties and any children covered by the order.

Example: Maria enters her SSN, DOB 07/14/1982, NJ DL G1234-56789-12345, and the children’s SSNs and DOBs.

Nuance: If you do not know the other party’s SSN, write “Unknown” — do not guess.

Common mistake and consequence: Filers put SSNs in the certification or motion itself. That data becomes public, and the clerk will reject the filing under Rule 1:38-7.

Misconception: People believe the CLIS is optional. It is mandatory in every Family Part filing involving support.

Part 8: Certification of Service

Plain English: Your signed statement that you mailed or e-served the packet on the other party.

How to answer: State the date, method (regular and certified mail under R. 1:5-2, or eCourts e-service if both sides are registered), and the address used. Sign and date.

Example: “I served a copy by regular and certified mail on 05/22/2026 at 47 Maple Avenue, Hackensack, NJ 07601.”

Nuance: Keep the certified mail green card and the USPS tracking receipt — the court may ask for proof.

Common mistake and consequence: Filers serve only by regular mail. Without certified mail or eCourts service, the judge cannot confirm notice and adjourns the motion.

Misconception: People think text messages or emails count as service. They do not unless the rule expressly allows electronic service.

Part 9: Signature and Notarization Block

Plain English: Your final signature making the certification true under penalty of perjury.

How to answer: Sign in blue or black ink, print your name, and date the signature line on the last page of the certification. The form does not require a notary because R. 1:4-4(b) allows a self-executing certification.

Example: David signs “/s/ David R. Gonzalez” and dates 05/22/2026.

Nuance: If you are filing through JEDS, an electronic signature in the format /s/ Your Name is accepted.

Common mistake and consequence: Filers leave the signature line blank, and the clerk rejects the filing immediately because an unsigned certification has no legal weight.

Misconception: People think they need to find a notary. New Jersey replaced the notary requirement on most court filings decades ago — your own signature under R. 1:4-4(b) is sufficient.


Three Filled-Out Examples Using Real Scenarios

Below are three named filers walking the entire CN-10474 packet from caption to signature. Each is a fact pattern that Family Part judges see weekly.

Scenario 1: David Gonzalez — Job Loss Modification (Bergen County)

David, 44, was laid off from a logistics job in Teterboro after 11 years and now collects unemployment.

Form Section What David Enters
Caption MARIA L. GONZALEZ v. DAVID R. GONZALEZ, FM-02-001234-19, Bergen County
Relief Requested Modify Child Support checked
Return Date 06/19/2026 (28 days out)
Changed Circumstance “Laid off from Acme Logistics 03/03/2026; income dropped from $7,400/mo to $2,150/mo unemployment”
Current Support $312/week, set 04/12/2019
Proposed Support $145/week effective 04/01/2026
CIS Income Gross monthly: $2,150 (unemployment)
Attachments Layoff letter, last 3 pay stubs, 2024 and 2025 tax returns, NJDOL determination
Filing Channel JEDS, $50 fee paid by Visa
Signature /s/ David R. Gonzalez, 05/22/2026

Scenario 2: Janet Pierce — Alimony Termination Based on Cohabitation (Monmouth County)

Janet, 58, has paid limited-duration alimony to her ex-husband for six years and has photographic and lease evidence that he now lives with a romantic partner.

Form Section What Janet Enters
Caption JANET A. PIERCE v. ROBERT M. PIERCE, FM-13-002987-18, Monmouth County
Relief Requested Terminate Alimony checked
Return Date 07/10/2026
Changed Circumstance “Defendant has cohabited with Karen Doe at 22 Ocean Ave., Long Branch since 09/2024”
Legal Basis N.J.S.A. 2A:34-23(n); Konzelman v. Konzelman, 158 N.J. 185 (1999)
Current Support $1,800/month alimony
Proposed Order “Alimony obligation terminated effective date of filing”
Attachments Joint lease, joint utility bill, 14 social media posts, PI report
Filing Channel In person, Monmouth Vicinage, Freehold
Signature /s/ Janet A. Pierce, 05/22/2026

Scenario 3: Carlos Rivera — Child Support Termination Due to Emancipation (Essex County)

Carlos, 51, has paid child support for his son Diego since 2008. Diego turned 23 in March 2026 and graduated from Rutgers in May 2026.

Form Section What Carlos Enters
Caption ELENA RIVERA v. CARLOS RIVERA, FM-07-004411-08, Essex County
Relief Requested Terminate Child Support checked
Return Date 06/26/2026
Changed Circumstance “Diego Rivera, DOB 03/15/2003, graduated Rutgers University 05/18/2026 and is fully employed”
Legal Basis N.J.S.A. 2A:17-56.67 (child support termination at 23)
Current Support $215/week
Proposed Order “Child support obligation terminated effective 05/18/2026; arrears, if any, reduced to judgment”
Attachments Diego’s diploma, employment offer letter, prior order, Probation account statement
Filing Channel Mail to Essex Family Division, Newark
Signature /s/ Carlos Rivera, 05/22/2026

How to File the Completed Form

CN-10474 can be filed three ways, and each channel has its own quirks. Pick the channel that fits your comfort level and the urgency of the relief.

Filing Online Through JEDS

The fastest channel is the Judiciary Electronic Document Submission (JEDS) portal. Upload the entire packet as a single PDF, select Family then Post-Judgment Motion, pay the $50 filing fee with Visa, MasterCard, Discover, or e-check, and download the confirmation receipt. Processing time runs 3 to 7 business days, and the stamped-filed copy returns to your JEDS dashboard. Save that PDF — it is your proof of filing.

Filing by Mail

Mail the original packet plus one copy to the Family Division, Superior Court of New Jersey in your vicinage — addresses are listed on the vicinage directory. Include a check or money order for $50 payable to Treasurer, State of New Jersey and a self-addressed stamped envelope. Mail processing usually takes 7 to 14 business days. Use certified mail with return receipt so you can prove delivery.

Filing in Person

Walk the packet to the Family Division Intake counter at your county courthouse during business hours (typically 8:30 a.m. to 4:30 p.m.). Pay the $50 fee by cash, check, money order, or credit card depending on the vicinage. The clerk stamps your copy on the spot. In-person filing is best for last-minute return dates because the date-stamp is immediate.

A common misconception is that filing fees are waivable on request. They are not automatic — you must complete a separate Application to Proceed as an Indigent (Form CN-11195) and meet income guidelines tied to 150% of the federal poverty level.


What Happens After You File

Within a few days of filing, the clerk assigns your motion to a Family Part judge and dockets the return date. The other party, called the respondent, has until 15 days before the return date to file opposition under R. 1:6-3. You then have until 8 days before the return date to file a reply.

Most CN-10474 motions are decided on the papers, meaning the judge reads everything and issues a written order without a hearing. If the judge finds you made a prima facie showing of changed circumstances under Lepis, the court may schedule a plenary hearing where both sides testify. A plenary hearing is essentially a mini-trial focused on income, expenses, and credibility.

The signed order is uploaded to eCourts and mailed to both parties. New support amounts flow automatically to Probation Child Support Enforcement, which adjusts the wage withholding within two pay cycles. Until the new order issues, you must keep paying the old amount — stopping early creates arrears the judge cannot retroactively forgive under N.J.S.A. 2A:17-56.23a.

A misconception worth flagging: filers often think a denial is final. It is not. You can refile when circumstances change again, and you can appeal to the Appellate Division within 45 days under R. 2:4-1.


Mistakes to Avoid When Filling Out the Form

Below are the errors that knock CN-10474 motions out most often. Each carries a real-world consequence.

  • Filing without a current CIS. The judge denies the motion for failing to satisfy R. 5:5-4(a)(2).
  • Forgetting the prior CIS. No comparison means no Lepis showing, and the motion fails on the papers.
  • Picking a return date less than 24 days out. The clerk reschedules and you lose a full motion cycle.
  • Leaving SSNs in the certification. The clerk rejects the filing under the privacy rule R. 1:38-7.
  • Serving by regular mail only. The judge cannot confirm notice and adjourns to the next cycle.
  • Asking for retroactive modification before the filing date. The relief is barred by N.J.S.A. 2A:17-56.23a.
  • Using last year’s downloaded form. The clerk bounces superseded versions.
  • Not signing the certification. An unsigned certification has no legal force and is rejected immediately.
  • Skipping pay stub or tax return attachments. The judge cannot verify income, and the motion fails on proof.
  • Listing your current name instead of the divorce-judgment name. The caption no longer matches, so the clerk rejects.
  • Leaving the proposed order out of the packet. Without a draft order, the judge has nothing to sign.
  • Putting cohabitation evidence in a separate envelope. Loose evidence gets lost; everything must be exhibits to the certification.

Do’s and Don’ts

These quick rules will keep your packet moving through the system.

  • Do download the Revised 09/2024 packet the same week you file — minor field changes happen often.
  • Do number every paragraph in the certification because judges quote paragraph numbers in their decisions.
  • Do attach exhibits behind the certification with tabs labeled Exhibit A, Exhibit B, etc., for easy reference.
  • Do keep one full copy of the filed packet for your own records, including the green card and JEDS receipt.
  • Do serve the other party the same day you file to start the response clock immediately.
  • Do continue paying the existing order until the judge signs a new one, or arrears will accrue.
  • Don’t include legal argument inside factual paragraphs — separate sections keep the certification readable.
  • Don’t attach photographs without dates or context; unlabeled photos carry no evidentiary weight.
  • Don’t discuss issues outside support (custody, parenting time) in CN-10474 — they require a different motion.
  • Don’t rely on text messages between you and the other party as proof; the judge wants documents.
  • Don’t pay the other party directly during a child support case — payments outside Probation are presumed gifts.
  • Don’t forget to check the Request for Oral Argument box if you want to be heard live.

Pros and Cons of Filing on Your Own vs. With Help

Many filers wonder whether to hire a Family Part attorney or proceed pro se. Both paths are common.

  • Pro (pro se): Cost. You save thousands compared to retainer-based representation.
  • Pro (pro se): Control. You speak in your own voice and decide every paragraph.
  • Pro (pro se): Speed. You can file the same week the changed circumstance happens.
  • Pro (pro se): Self-help resources. The Judiciary’s family self-help page walks through every step.
  • Pro (pro se): Confidentiality. No third party sees your finances.
  • Con (pro se): Procedural risk. Missing one rule like R. 5:5-4 can sink the motion.
  • Con (pro se): Evidentiary blind spots. Lay filers rarely know what a prima facie showing requires.
  • Con (pro se): Emotional fatigue. Drafting against an ex-spouse is exhausting.
  • Con (pro se): No leverage in settlement. Lawyers often resolve motions before the return date; pro se filers usually litigate.
  • Con (pro se): Appellate exposure. A bad order is harder to appeal without a clean record.

CN-10474 vs. CN-10487 at a Glance

Both forms travel together, but they do different jobs.

Feature CN-10474
Purpose Notice of Motion to Modify or Terminate Alimony/Child Support
Required signature Filer’s certification under R. 1:4-4(b)
Filing fee $50 post-judgment motion fee
Statutory anchor N.J.S.A. 2A:34-23
Filed alone? No — always with CIS Form CN-10487
Feature CN-10487
Purpose Family Part Case Information Statement (financial disclosure)
Required signature Filer’s certification under R. 5:5-2
Filing fee None when filed as an attachment
Statutory anchor R. 5:5-4
Filed alone? No — attached to CN-10474 or other support motion

FAQs

Is the filing fee for CN-10474 really $50?

Yes. The post-judgment motion fee in the Family Part is $50, set by N.J.S.A. 22A:2-12 and confirmed on the Judiciary’s filing fee schedule.

Can I file CN-10474 if I never had a divorce decree?

Yes. Parents who were never married can use CN-10474 to modify a non-dissolution (FD) child support order; cite the FD docket number in the caption.

Do I need a notary to sign the certification?

No. Rule 1:4-4(b) lets you sign under penalty of perjury without a notary.

Should I write my maiden name or married name in the caption?

No to your maiden name unless that is the name on the original divorce judgment; always match the judgment caption exactly to keep the docket aligned.

Do I write SSNs on the Notice of Motion page?

No. SSNs go only on the Confidential Litigant Information Sheet (Form CN-11268), never on the public motion or certification.

Is the return date the same as the hearing date?

No. In Family Part the return date is usually the decision date on the papers, not a live hearing, unless the judge orders oral argument.

Can I check both “Modify Alimony” and “Modify Child Support”?

Yes. A single CN-10474 can request multiple forms of relief, but you must support each request with its own facts and exhibits.

Will arrears be wiped out if my motion is granted?

No. Accrued child support arrears are vested under N.J.S.A. 2A:17-56.23a and cannot be reduced retroactively.

Should the proposed order include a Probation directive?

Yes. Always add a paragraph telling Probation Child Support Enforcement to recalculate withholding so the new amount actually flows from the paycheck.

Do I have to attach my prior CIS even if it’s old?

Yes. The court compares your old CIS to your new one to apply the Lepis changed-circumstances test.

Can I file CN-10474 in any New Jersey county?

No. File in the vicinage that issued the underlying support order; venue is fixed by R. 5:7-1.

Is JEDS available to self-represented filers?

Yes. The JEDS portal accepts pro se filings and is the fastest way to file CN-10474.

Do I check “Request for Oral Argument” by default?

Yes, if you want the chance to speak; judges grant oral argument on support motions when requested and the issues are contested.

Can I file CN-10474 to stop paying because we agreed verbally?

No. Only a signed court order modifies a support obligation, regardless of any side agreement between the parties.

Will my driver’s license be suspended if I miss the old amount during the motion?

Yes, potentially — Probation can seek suspension under N.J.S.A. 2A:17-56.41 once arrears reach the threshold, so keep paying while the motion is pending.