New Jersey uses an income-based formula, not a percentage of your paycheck

New Jersey child support is calculated using the Child Support Guidelines, a formula set by state law that depends on both parents' gross income, the number of children, and custody arrangement. The formula is not a flat percentage — it produces a specific dollar amount based on a table. The state publishes the table each year, and it changes because the formula adjusts for inflation.

The calculation starts with combined parental income: the gross income of both parents added together. "Gross income" means income before taxes, and it includes wages, self-employment income, rental income, Social Security, unemployment benefits, and some other sources. Once the state knows the combined income, it looks up that amount on the current year's guideline table to find the base child support obligation. That obligation is then divided between the parents based on what percentage of the combined income each parent earns.

If combined income exceeds the cap on the guideline table (which varies by year but is typically around $163,000 as of recent years), the judge has discretion to order support above the table amount or to apply the table percentage to the income above the cap. The actual order also accounts for who has custody, how much time each parent spends with the children, and other factors like health insurance costs.

Key Takeaways

  • Child support is calculated by adding both parents' gross income, looking up that total on the state guideline table, and dividing the obligation based on each parent's share of income.
  • Gross income includes wages, self-employment earnings, rental income, and benefits — not just a paycheck.
  • The guideline table changes yearly and has an income cap; income above the cap is handled at the judge's discretion.
  • Custody arrangement and parenting time affect the final order, as do costs like health insurance and childcare.
  • Either parent can request a recalculation if income changes significantly or if the order is more than three years old.

What counts as income for child support purposes

The state defines gross income broadly. It includes your W-2 wages, salary, bonuses, and commissions. It also includes self-employment income (your net business profit after business expenses), rental income, interest and dividend income, and income from pensions or annuities. Unemployment benefits, workers' compensation, and Social Security benefits all count. Disability benefits (SSDI) count as well.

Some income does not count. Child support you receive for other children, means-tested public benefits like TANF or SNAP, and gifts or inheritances are excluded. If you receive income from a source that is temporary or one-time — like a settlement or a bonus that will not recur — the court may or may not include it depending on the circumstances.

If you are self-employed or have irregular income, you will need to provide tax returns, profit-and-loss statements, and sometimes bank statements to show what your actual income is. The court will not accept your word alone. If you own a business, the court may also look at whether you are taking a lower salary to reduce your support obligation, and it can add back income it believes you are hiding.

How the guideline table works and what it produces

New Jersey publishes a table each year showing the base child support obligation for different income levels and different numbers of children. The table has rows for combined income (in bands, like $1,000–$1,100 per week) and columns for one child, two children, three children, and so on. You find the row that matches your combined weekly or monthly income, then read across to the column for your number of children. That cell shows the total obligation.

The table assumes a standard custody arrangement. If one parent has primary custody and the other has parenting time on a regular schedule, the non-custodial parent typically pays the full obligation. If custody is shared more equally, the calculation is different — the obligation is still calculated from the table, but it may be reduced based on the amount of time each parent has the children.

The obligation produced by the table is the base support. On top of that, the court usually adds an allocation for health insurance premiums (the parent who pays the insurance premium, or a share of it), and sometimes an allocation for childcare costs or unreimbursed medical expenses. These add-ons are not part of the table; they are calculated separately and added to the base.

How income is divided between parents when one earns more

Once the table produces a base obligation, that obligation is split between the parents in proportion to their income. If the combined income is $5,000 per week and the table says the obligation is $800, and one parent earns $3,000 per week (60%) and the other earns $2,000 per week (40%), then the first parent pays 60% of $800 ($480) and the second pays 40% ($320).

The parent with primary custody usually receives the support; the non-custodial parent usually pays it. If custody is split, the parent who earns more may still owe support to the parent who earns less, or the obligation may be offset (reduced) based on the custody split. The court order will specify who pays whom and in what amount.

What happens when income is above the guideline table cap

The guideline table has a ceiling — an income level above which the table does not go. As of recent years, this cap is around $163,000 in combined weekly income, though the exact figure changes annually. If your combined income exceeds the cap, the judge is not bound by the table. Instead, the judge has discretion to order support in one of two ways: by applying the table percentage to the income above the cap, or by using the judge's own judgment about what is appropriate.

In practice, judges often apply the highest table percentage to income above the cap. So if the table shows that at the cap, the obligation is $X per week, and the percentage of combined income that represents is Y%, then income above the cap is multiplied by Y% to produce additional support. But this is not automatic — the judge can deviate if the circumstances warrant it.

If you have very high income, you should expect the court to order support well above the table amount. The court will also consider the standard of living the children would have had if the parents had remained together, and whether the support order allows the children to maintain that standard.

Adjustments for custody and parenting time

The guideline table assumes one parent has primary custody and the other has regular parenting time (typically every other weekend and one weeknight). If the actual arrangement is different, the support obligation may be adjusted.

If one parent has the children more than 50% of the time, the obligation is reduced. The reduction is based on the number of overnights or the percentage of time. The court will calculate what the obligation would be if the parent with more time were the "non-custodial" parent, and then offset the two obligations. The parent who owes more pays the difference.

If custody is truly equal (50-50), the obligation may be very small or even zero, depending on the income difference. A parent with equal custody and higher income may owe support to the other parent; a parent with equal custody and lower income may owe nothing.

When and how to request a recalculation

Child support orders do not automatically change when income changes. You must file a motion with the court to modify the order. New Jersey law allows a modification if there has been a "substantial and continuing change in circumstances" — typically a change in income of at least 10% or $50 per week, whichever is greater. You will need to show proof of the income change: recent pay stubs, tax returns, or a letter from your employer.

You can also request a recalculation if the order is more than three years old. The court will recalculate using the current guideline table and current income, even if income has not changed. This is called a "three-year review." Either parent can request it, and it does not require proof of a change in circumstances.

To file a motion, you submit it to the Family Court in the county where the order was issued. You will need to serve a copy on the other parent. If you cannot afford an attorney, you may be able to get help from a legal aid organization or the court's self-help center. The process typically takes several months.

Frequently Asked Questions

Does New Jersey use a percentage of income for child support?

No. New Jersey uses a table-based formula, not a percentage. The table shows a specific dollar amount based on combined income and number of children. That amount is then divided between parents based on their income shares. The result is different from a flat percentage because the obligation per dollar of income changes at different income levels.

What if I am self-employed or have irregular income?

You must provide tax returns, usually for the past two years, and sometimes profit-and-loss statements or bank statements. The court will average your income over time to find a stable figure. If your income is genuinely unpredictable, the court may order a base amount plus a percentage of income above that, so support adjusts with your actual earnings.

Can child support be modified if I lose my job?

Yes, but only if you file a motion and show the job loss was not voluntary. If you quit your job to avoid support, the court will not reduce your obligation. If you were laid off or fired, you can request a modification. You will need to show proof of the job loss and your efforts to find new work. Support may be reduced or temporarily suspended while you search for employment.

Does the guideline table include health insurance and childcare?

No. The table produces the base support amount only. Health insurance premiums and childcare costs are added on top. The parent who pays the insurance usually pays their share of the premium, and childcare costs are divided based on income share. These are separate line items in the final order.

What if one parent hides income?

If you suspect the other parent is underreporting income, you can request the court to order financial disclosure — tax returns, pay stubs, bank statements, and sometimes a deposition. If the court finds that income was hidden, it can impute (assign) income to that parent based on their earning capacity, their work history, or other evidence. The court can also order the parent to pay your attorney fees for making you prove what should have been disclosed.