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State Guide · New Jersey
Child Support in New Jersey: How It's Calculated, Modified & Enforced
A plain-English guide to New Jersey child support — the guideline model, how the number is computed, the modification and enforcement process, and where to find the official worksheet.
Direct answer
Net. Each parent\'s gross income is converted to a standardized net figure using IRS withholding tables (federal/state income tax, Social Security, Medicare) before the schedule is applied.
New Jersey uses the Income Shares model under Court Rule 5:6A and Appendix IX on both parents' NET income. Each parent's gross income is first converted to a standardized net figure using IRS withholding tables (federal/state taxes, FICA, Medicare), then combined and looked up in the guideline schedule; the obligation is split by income share. Two worksheets apply: Sole Parenting (Appendix IX-C, when the alternate-residence parent has fewer than 104 overnights/year) and Shared Parenting (Appendix IX-D, 104+ overnights). The result is a rebuttable presumption; a self-support reserve (about 150% of the federal poverty level) protects low-income payors.
Open the New Jersey child support calculator to see your own number under the current guideline: New Jersey calculator.
How a support order is established in New Jersey
Establish parentage if needed, then open a case through the county Board of Social Services, the Family Division of Superior Court, or NJ Child Support Services (a one-time $6 fee, waived for public-assistance recipients).
Both parents report gross weekly income and allowed deductions (taxes, FICA, mandatory retirement, union dues, prior support) to reach net income; the Shared vs. Sole Parenting worksheet is chosen by overnights.
Combine net incomes and use the guideline schedule (Appendix IX-F) to find the basic obligation; add the marginal cost of the child\'s health insurance and work-related childcare (for a child under 15 or with a disability).
The court applies the worksheet amount, which is presumptive. A judge may deviate only with written findings (e.g., special needs, extraordinary costs, or an agreement).
Support is paid through income withholding (deducted from the paycheck) and monitored by the Probation Division\'s Child Support Enforcement unit.
To modify: file a motion in the Family Division showing substantial changed circumstances (Lepis v. Lepis); modifications are effective from the filing date.
Worked examples
Illustrative example — one child, Sole Parenting worksheet — Parent A (payor) gross $6,000/month; Parent B (recipient) gross $3,000/month. One child. Parent A has fewer than 104 overnights/year. Each gross income is converted to standardized net using IRS withholding tables. The combined net income is looked up in the Appendix IX-F schedule for one child to get the basic obligation. Parent A (about 67% of combined gross) pays their income-share of that base plus their share of the child\'s health-insurance marginal cost and work-related childcare. (Exact base from the official schedule; the proportional split is New Jersey\'s Income Shares method.) New Jersey converts gross to standardized net before applying the schedule; the higher earner pays their income-share of the total obligation.
Illustrative example — Shared Parenting worksheet — The alternate-residence parent has 104 or more overnights per year (about 28%+). Appendix IX-D (Shared Parenting) applies an adjustment for duplicated fixed costs (housing/utilities) during the paying parent\'s time, generally producing a lower cash obligation than the Sole Parenting worksheet. Reaching the 104-overnight threshold shifts the case to the Shared Parenting worksheet and typically lowers the payment.
Modifying or enforcing an order
Orders in New Jersey can be modified when there is a substantial change in income, custody, or circumstances. Use the modification eligibility check and the cross-state comparison tool to see how a move would change the outcome. Enforcement runs through the state agency and can include income withholding and contempt proceedings.
Official sources
NJ Child Support Services (official) — https://njchildsupport.org/
New Jersey Courts (official) — https://www.njcourts.gov/
Is New Jersey gross or net income?
Net. Each parent\'s gross income is converted to a standardized net figure using IRS withholding tables (federal/state income tax, Social Security, Medicare) before the schedule is applied.
Sole vs. Shared Parenting worksheet?
The Sole Parenting Worksheet (Appendix IX-C) applies when the alternate-residence parent has fewer than 104 overnights/year; the Shared Parenting Worksheet (Appendix IX-D) applies at 104+ overnights and adjusts for duplicated household costs.
When does support end?
At emancipation, which usually occurs around age 19 but is not a fixed age; the court may order support through college in some cases.
Can the court deviate?
Yes, with written findings — for example, a child\'s special needs, extraordinary medical costs, other dependents, or an agreement between parents.
Is there a self-support reserve?
Yes, the guidelines build in a self-support reserve tied to about 150% of the federal poverty guideline for one person, updated annually, to keep low-income payors above subsistence.
New Jersey child support calculator
Estimate for New Jersey
New Jersey uses the Income Shares model.
Enter the paying parent’s net (after-tax/deductions) monthly income.
New Jersey Child Support Worksheet — Planning Estimate
Generated September 22, 2026 · Model: Income Shares · Income basis: net · Statute: N.J. Court Rule 5:6A (App. IX)
This is an informal planning estimate, not a court worksheet and not legal advice. Confirm the current guideline with the state child-support agency or a licensed family-law attorney.
Estimated monthly support$1,179.44per month
Official schedule: New Jersey Child Support Guidelines, Appendix IX-F (revised eff 2025-09-01) (2025)
Annual estimate$14,153.28
Effective rate23.6%
MethodIncome Shares: combined income → official New Jersey schedule → split by income share (+ add-ons, parenting-time credit)
View calculation breakdown
Combined parental income
$9,000
Total basic obligation (schedule)
$2,123
Obligor income share
55.6%
Obligor basic obligation
$1,179
Estimated monthly support
$1,179
How the basic obligation splits between parents
56%
44%
Paying parent: $1,179 Other parent: $944
Each parent pays their proportional share of the combined basic obligation.
Estimated monthly support by number of children
At the incomes you entered, for 2 children.
This article is general education, not legal or tax advice. For your exact number, open your state calculator.
Not legal or financial advice. This estimate follows the state’s statutory guideline formula but cannot capture every factor a court considers (health insurance, childcare, prior orders, deviations, imputed income).
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