Child Support in New Jersey: Guidelines and Calculations

A father in Middlesex County earning $95,000 per year assumed his child support obligation would be roughly 20% of his income — about $365 per week. When the court ran the actual New Jersey guidelines calculation, his obligation came out to $247 per week. The difference? New Jersey does not use a simple percentage formula. It uses the Income Shares Model, which considers both parents’ incomes, the number of children, healthcare costs, childcare expenses, and the parenting time schedule. The result is often different from what people expect — sometimes higher, sometimes lower.

Understanding how New Jersey calculates child support helps you plan financially and avoid surprises. This guide covers the guidelines formula, what income counts, how shared parenting time affects the calculation, and the rules for modification, college contributions, and enforcement. For a national overview, see our guide on child custody laws explained, and try our child support calculator for a quick estimate.

How New Jersey Calculates Child Support

New Jersey uses the Income Shares Model for child support calculations, a framework adopted by approximately 40 states. The core principle: children should receive the same proportion of parental income they would have received if the family had remained intact.

Rather than calculating support as a percentage of one parent’s income, New Jersey combines both parents’ incomes and uses a schedule (found in Appendix IX-F of the New Jersey Court Rules) to determine the total child support obligation. That obligation is then divided between the parents in proportion to their respective incomes.

Step-by-Step Calculation

Step 1: Determine each parent’s gross income. Gross income includes wages, salaries, bonuses, commissions, overtime, self-employment income, pensions, Social Security, disability benefits, unemployment, rental income, dividends, interest, and most other regular sources of income.

Step 2: Calculate adjusted gross income. Certain deductions reduce gross income to arrive at the adjusted figure:

• Federal, state, and local income taxes (based on withholding tables, not actual withholding)
• Social Security and Medicare taxes
• Mandatory union dues
• Existing child support orders for other children
• Other-dependent deductions (for children from other relationships)

Step 3: Combine both parents’ net incomes. The combined weekly net income determines where the case falls on the support schedule. New Jersey’s current schedule covers combined net incomes up to $187,200 per year. For incomes above that threshold, the court has discretion to set support based on the child’s needs and the family’s standard of living.

Step 4: Find the basic support amount. Using the Appendix IX-F schedule, look up the combined net income and the number of children to find the basic weekly child support amount. This figure represents the total support obligation for both parents combined.

Step 5: Divide proportionally. Each parent’s share of the support obligation equals their percentage of the combined net income. If Parent A earns 60% of the combined income and Parent B earns 40%, Parent A is responsible for 60% of the total obligation.

Step 6: Add supplemental expenses. Net childcare costs (after any tax credits), the child’s share of health insurance premiums, and unreimbursed medical expenses exceeding $250 per child per year are added on top of the basic support amount and divided proportionally.

Step 7: Apply parenting time adjustment. If the non-custodial parent has the child for more than 28% of overnights (roughly two or more overnights per week), a shared parenting worksheet adjusts the support amount downward to reflect the direct spending that occurs during that parent’s parenting time.

What Counts as Income

New Jersey’s definition of income for child support purposes is broad. It includes:

• Employment income: wages, salary, overtime, bonuses, commissions, tips
• Self-employment income: net business earnings after legitimate business expenses
• Investment income: dividends, interest, capital gains, rental income
• Government benefits: Social Security (except SSI), disability benefits, unemployment compensation, workers’ compensation
• Retirement income: pensions, annuities, IRA distributions
• Other income: alimony received, trust distributions, severance pay, lottery winnings

Income that is not included:

• Supplemental Security Income (SSI)
• Public assistance benefits (TANF, SNAP)
• Foster care payments
• Income of a new spouse or partner (though it may be considered in certain deviation arguments)

Imputed Income

If a parent is voluntarily unemployed or underemployed, the court may impute income — assign an earning capacity based on what that parent could reasonably earn given their education, work history, and the job market. The court looks at recent work history, available job opportunities, and whether the parent has made reasonable efforts to find appropriate employment.

A mother named Karen in Union County left her $70,000 marketing job to work part-time earning $25,000. She argued that she wanted more time with the children. The court imputed income at $55,000, finding that while some reduction was reasonable given her caregiving responsibilities, the full reduction to part-time was not justified. Her child support obligation was calculated based on the imputed figure.

Sole Parenting vs. Shared Parenting Worksheets

New Jersey uses two different worksheets depending on the parenting time arrangement.

Sole Parenting Worksheet (Appendix IX-B)

Used when the non-custodial parent has the child for fewer than 28% of overnights (roughly fewer than two overnights per week on average). This is the standard worksheet for most cases where one parent has primary residential custody.

Shared Parenting Worksheet (Appendix IX-D)

Used when the non-custodial parent has the child for 28% or more of overnights (approximately 104 or more overnights per year). The shared parenting worksheet adjusts the support calculation to account for each parent’s direct spending during their parenting time.

Under shared parenting, the support amount is generally lower than under sole parenting because the paying parent is directly covering costs (food, activities, transportation) during their parenting time. The larger the parenting time share, the greater the adjustment.

Health Insurance and Medical Costs

Health insurance for the child is a mandatory component of every child support order in New Jersey. The court determines which parent will provide coverage based on availability and cost.

• The child’s share of the health insurance premium is calculated and added to the basic support obligation
• The cost is divided proportionally between the parents based on income shares
• Unreimbursed medical, dental, and mental health expenses exceeding $250 per child per year are typically split proportionally

If neither parent has employer-sponsored coverage, the court may order one parent to obtain coverage through the health insurance marketplace or include the child in NJ FamilyCare (the state’s Medicaid/CHIP program).

College and Post-Secondary Education Costs

New Jersey is one of the few states where courts can order parents to contribute to a child’s college education. This is separate from and in addition to regular child support.

The Newburgh Factors

Courts use a set of factors established in Newburgh v. Arrigo (1982) to determine whether and how much a parent must contribute to college costs:

• Whether the parent would have contributed if the family had remained intact
• The effect of the cost on the parent’s financial circumstances
• The child’s relationship with the parent and the parent’s commitment to the child’s education
• The child’s aptitude and commitment to education
• Available financial aid, scholarships, and grants
• The child’s ability to contribute through work-study or part-time employment
• The type of education sought (public vs. private, in-state vs. out-of-state)

A court will not order a parent to contribute to college costs if it would be unreasonable given their financial situation. The obligation generally does not extend to graduate school.

Duration

Child support and educational support obligations in New Jersey terminate by operation of law when the child turns 23. Support may continue past age 19 (the default termination age) if the child is enrolled full-time in post-secondary education. The 2017 amendments set a hard cap at age 23 — no child support obligation, including college contributions, extends beyond that age.

Modifying Child Support

Child support orders in New Jersey are not permanent. Either parent can seek a modification when circumstances change.

Automatic Review

New Jersey law permits routine reviews of child support orders every three years. Either parent can request a review through the Probation Division without needing to show changed circumstances.

Changed Circumstances

Outside the three-year review cycle, a parent must show a substantial change in circumstances to modify support. A change of 15% or more in either parent’s income generally qualifies. Other qualifying changes include:

• Job loss or significant income change
• A new child support obligation (for another child)
• A significant change in the parenting time schedule
• A change in the child’s medical needs
• The child reaching emancipation age or becoming self-supporting

How to Request a Modification

You can file a motion with the Family Division of the Superior Court or request a review through the county Probation Division (for cases managed through probation). Court modifications require showing changed circumstances. Probation reviews use the current guidelines to recalculate support based on updated income information.

Modifications are effective from the date the motion is filed, not retroactively. If your circumstances change, file promptly — delays cost money.

Enforcement

New Jersey has strong enforcement mechanisms for child support. The state’s child support program, administered through county Probation Divisions, collects and distributes payments and pursues enforcement when parents fall behind.

Enforcement Tools

• Income withholding — the most common method; support is deducted directly from the paying parent’s paycheck
• Interception of tax refunds — federal and state refunds can be redirected to cover arrears
• License suspension — driver’s license, professional licenses, and recreational licenses can be suspended
• Passport denial — parents owing more than $2,500 in arrears can be denied a U.S. passport
• Credit reporting — overdue support is reported to credit agencies
• Bank account seizure — funds can be levied from bank accounts
• Contempt of court — willful failure to pay can result in fines and incarceration

If you are owed support and not receiving it, contact your county Probation Division or the New Jersey Child Support Program for assistance.

Frequently Asked Questions

How much is child support in New Jersey for one child?

There is no single answer because New Jersey uses the Income Shares Model, which depends on both parents’ incomes, the parenting time arrangement, and supplemental costs like health insurance and childcare. As a rough example, for combined net parental income of $1,500 per week with one child, the basic weekly support obligation is approximately $260 to $300 before adjustments. Use the state’s QuickCalc tool for an estimate based on your specific numbers.

Does child support end at 18 in New Jersey?

Not automatically. New Jersey child support terminates at age 19 by default, not 18. Support can continue past 19 if the child is enrolled full-time in post-secondary education, still in high school, or has a disability that existed before age 19. All child support obligations terminate by operation of law at age 23, regardless of circumstances.

Can child support be waived in New Jersey?

No. Child support is a right of the child, not the parents, and it cannot be waived by agreement between the parents. Parents can agree on amounts that differ from the guidelines, but the court must approve any deviation and ensure the amount adequately serves the child’s needs.

How does shared custody affect child support in New Jersey?

When the non-custodial parent has the child for 28% or more of overnights (about 104+ overnights per year), the court uses the shared parenting worksheet instead of the sole parenting worksheet. This typically results in a lower support obligation because the paying parent incurs direct costs during their parenting time. The more equal the parenting time, the greater the reduction.

Can New Jersey courts order parents to pay for college?

Yes. New Jersey is one of the few states where courts can order parents to contribute to a child’s college education. Courts consider factors including the parent’s financial ability, the child’s academic aptitude, the cost of the education, and available financial aid. The obligation extends to age 23 at most and generally does not cover graduate school.

How This Guide Was Researched

This guide was created by reviewing publicly available legal information from official state statutes, judiciary websites, court resources, and family law publications. The goal is to explain family law topics in plain English so readers can better understand the process before speaking with an attorney.

Sources and Legal References

This guide is based on publicly available legal information and official sources, including:

• N.J.S.A. 2A:34-23 — Child Support (Justia)
• Appendix IX-B — Use of Child Support Guidelines, Sole Parenting (NJ Courts)
• Appendix IX-D — Shared Parenting Worksheet (NJ Courts)
• QuickCalc — NJ Child Support Calculator
• Child Support FAQs — NJ Child Support Program

Official New Jersey Resources

• New Jersey Child Support Program
• NJ Courts — Child Support Self-Help
• New Jersey Legislature — Family Law Statutes
• Legal Services of New Jersey

For more about how we research our guides, see our editorial policy and sources methodology.

Related Guides

Learn more about related family law topics:

• Divorce in New Jersey
• Child Custody in New Jersey
• Child Support Calculator
• Child Custody Laws Explained
• How Much Does Divorce Cost?
• The Complete Guide to Divorce
• Get a Free Consultation

Last updated: March 2026. This guide summarizes general legal information based on publicly available sources and is provided for educational purposes only. It does not constitute legal advice. For advice specific to your situation, consult a licensed attorney in your state.