Child support in New Jersey: how it's calculated and when it ends

How the NJ Child Support Guidelines work

New Jersey's Child Support Guidelines are found in Appendix IX of the Court Rules and apply through Rule 5:6A. They use an income shares approach: the court estimates what the parents together would spend on the child if they lived in one household, and each parent pays a share based on their portion of the combined net income.

The guidelines are a rebuttable presumption. A judge uses them unless a party shows that applying them would be unjust or inappropriate in that particular case, in which case the judge has to explain the reasons for going outside them.

The calculation looks at both parents' incomes, the number of children, overnight parenting time, health insurance costs for the child, work-related child care and certain other expenses. When the parents' combined net income is above $187,200 a year, the guidelines are applied up to that level and the court may add a discretionary amount based on the statutory factors.

Annual updates

The New Jersey Supreme Court updates parts of the guidelines each year. For example, revisions effective June 1, 2025 raised the self-support reserve to $451 a week (150 percent of the federal poverty guideline for one person) and updated the shared-parenting thresholds and tax tables. The self-support reserve is meant to keep a low-income paying parent from being left with too little to live on.

Existing support orders do not change automatically when the guidelines are updated. A parent who wants a new amount has to ask the court.

When child support ends: the age 19 rule

A New Jersey law effective February 1, 2017 (N.J.S.A. 2A:17-56.67) changed when support stops. Generally, child support paid through Probation ends when the child turns 19.

Support can continue past 19, up to the child's 23rd birthday, if the child is still in high school or another secondary program, is a full-time student in college, vocational or graduate school, or has a physical or mental disability. Continuation requires a court order or an agreement between the parties.

Probation cannot collect current support for a child who is 23 or older, although overdue support (arrears) can still be collected. Parents who believe support should continue beyond 23, for example for a child with a severe disability, need to seek another form of relief through the court.

College costs are a separate question

The guidelines generally are not used to figure out how much a parent pays toward college, or support for a child living away at college. The court may use them, in its discretion, for a student over 18 who commutes. College contributions are usually decided separately based on case law factors, so this is a common topic in settlement negotiations.

How Probation enforces support

Most New Jersey support orders are paid through the Probation Child Support Enforcement unit. According to the Judiciary, Probation monitors orders and takes action when payments stop. Income withholding from wages has been the standard method since the federal Family Support Act of 1988, and it can also reach unemployment benefits and some other income.

If support goes unpaid, enforcement tools include:

• Wage and income withholding
• Driver's license suspension, generally after six months of nonpayment or when a bench warrant issues, and possible suspension of professional or recreational licenses
• Interception of federal and state tax refunds and homestead rebates
• Enforcement hearings and bench warrants for failure to appear or pay
• Judgments and credit reporting

What counts as income and what the support covers

Getting the income numbers right is the heart of any support calculation. Courts generally start with gross income from all sources, such as wages, overtime, bonuses, commissions, self-employment income, unemployment and disability benefits, and investment income, and then work down to a net figure under the guidelines.

If a parent is voluntarily unemployed or working below their ability, a judge can impute income, meaning the court calculates support based on what the parent could reasonably earn. Self-employed parents and those paid largely in cash or bonuses often see disputes over what their true income is, and tax returns, bank statements and business records become important.

The basic support amount is meant to cover the child's ordinary needs, such as housing, food, clothing, transportation and routine costs. Some expenses are added on top, including the child's share of health insurance premiums, work-related child care, and unreimbursed medical costs above a threshold set in the guidelines. Other predictable but unusual expenses, such as special educational needs, can be handled separately.

Support orders usually also require a parent to provide health insurance for the child if it is available at a reasonable cost, and they often address how the parents will split costs that are not covered.

Child support can be decided as part of a divorce, or in a separate Family Part case between parents who were never married or who separated without divorcing. Either parent can file, and many orders route payments through Probation from the start, which creates an official record of every payment that is useful if there is ever a disagreement about what was paid.

Changing a support order

Either parent can ask the court to modify support when there has been a substantial change in circumstances, such as a significant, ongoing change in income, a change in custody or parenting time, or a change in the child's needs. Temporary setbacks often are not enough. Because changes generally run from the filing date rather than earlier, it matters to file promptly when circumstances change.

A parent who loses a job should not simply stop paying or wait to see what happens. Unpaid support keeps adding up as arrears, and arrears generally cannot be erased later. Filing for a review as soon as possible protects both parents and keeps the record clear.