How Is Child Support Calculated in North Carolina?

North Carolina calculates child support with a formula: add both parents’ gross monthly incomes together, look up the basic support amount for that combined income and number of children on the state’s Schedule of Basic Support Obligations, add health insurance premiums, work-related child care, and any extraordinary expenses, then split the total between the parents in proportion to their incomes — adjusted for the custody schedule. The formula comes from the North Carolina Child Support Guidelines (revised effective January 1, 2023), which apply presumptively whenever the parents’ combined gross income is $40,000 per month or less. Here is how the calculation works step by step, with a worked example.

What are the steps in the child support calculation?

Every guideline calculation follows the same sequence:

1. Determine each parent’s gross monthly income. Income from nearly all sources counts — wages, salary, bonuses, commissions, self-employment income, rental income, retirement, and more — before taxes are taken out.
2. Apply adjustments. Subtract child support a parent actually pays under a pre-existing order for other children, and an allowance for other children living in the parent’s home.
3. Combine the adjusted incomes and consult the schedule. The Schedule of Basic Support Obligations shows what intact families at that income level typically spend on that number of children.
4. Add the add-ons. The child’s portion of health insurance premiums, reasonable work-related child care, and any court-approved extraordinary expenses (private school, special needs, visitation travel).
5. Prorate between the parents. Each parent is responsible for the share of the total that matches their share of the combined income, credited for add-ons they pay directly, and adjusted by the worksheet that fits the custody arrangement.

Can you show an example calculation?

Here is a simplified illustration (round numbers, Worksheet A; the actual schedule amount will differ):

• Parent A earns $6,000 gross per month; Parent B earns $4,000. Combined income: $10,000. Parent A earns 60% of the combined income; Parent B earns 40%.
• Suppose the schedule sets the basic obligation for two children at that income level at roughly $1,600 per month.
• Parent B carries the children’s health insurance at $200 per month, and pays $400 per month in after-school care. Total obligation: $1,600 + $200 + $400 = $2,200.
• Parent B has primary custody (243+ overnights), so Worksheet A applies. Parent A owes 60% of $2,200 = $1,320 per month, paid to Parent B. Parent B’s 40% share is presumed spent directly on the children in her home.

If Parent A paid the insurance premium instead, the $200 would be credited against his transfer payment. This example is an illustration only — always run your real numbers through the official worksheet.

Does North Carolina use gross or net income?

Gross income — before taxes and payroll deductions. That surprises many parents, but the schedule was built with tax burdens already baked into its numbers. Gross income includes wages, salary, overtime, bonuses, commissions, self-employment and business income, rental income, dividends, retirement benefits, severance, workers’ compensation, unemployment, and Social Security benefits. It excludes means-tested public assistance (TANF, SSI, food assistance) and child support received for other children. The worksheet then allows limited adjustments, such as support actually paid under a pre-existing court order for other children. If income fluctuates — commissions, seasonal work, gig income — courts typically average recent earnings over a representative period rather than cherry-picking a high or low month.

How do I know which worksheet to use?

The worksheet is determined by overnights, not by labels like “joint legal custody”:

• Worksheet A — one parent has the children at least 243 overnights per year.
• Worksheet B — each parent has the children at least 123 overnights per year and shares the children’s expenses during their time.
• Worksheet C — the parents split custody of different children (each has primary custody of at least one child).

Worksheet B produces a lower transfer payment than Worksheet A because it accounts for both parents maintaining a home for the children — but it applies only when both parents truly cross the 123-overnight threshold.

How are overnights counted?

Count where the child actually sleeps over a full year under the schedule that is really being followed, not the one written down and ignored. An every-other-weekend schedule with a midweek dinner is typically well under 123 overnights; a 2-2-3 or week-on/week-off rotation is 182-183 each. Holiday and summer time counts. Because the difference between 120 and 123 overnights can change the entire calculation, overnight counting is one of the most heavily contested details in child support cases.

What if a parent is unemployed or hiding income?

Courts calculate support from actual income — unless a parent is voluntarily unemployed or underemployed in bad faith. In that case, the court can impute income: it calculates support as if the parent earned what their education, work history, and local job market show they could earn. Quitting a job to reduce support, refusing work, or hiding self-employment cash flow can all trigger imputation. There is a notable exception: income is generally not imputed to a parent who stays home as the primary caretaker of the parties’ child under age three. Self-employed parents should expect close scrutiny of business records, because gross receipts minus legitimate business expenses — not the bottom line of a tax return — is what counts.

When does the calculator mislead?

Online calculators, including ours, are excellent for ballpark numbers and poor at judgment calls. Try our [North Carolina child support calculator](/child-support-calculator/) to get an estimate — then keep these limits in mind:

• Garbage in, garbage out. The calculator trusts whatever income you enter. Disputed income, fluctuating commissions, and self-employment earnings are exactly where cases get fought.
• It cannot impute income. If the other parent is underemployed in bad faith, the real number may be far higher than the calculator shows.
• It cannot deviate. Judges can order more or less than the guideline amount where the formula would be unjust or fail to meet the child’s reasonable needs, with written findings. G.S. 50-13.4(c).
• High incomes fall outside it. Above $40,000 per month combined, the schedule no longer applies and the court sets support based on the children’s reasonable needs and the family’s standard of living.
• Worksheet choice is legal, not mechanical. Whether a schedule really qualifies for Worksheet B is often disputed.

Can parents agree to a different amount?

Yes. Parents can settle child support by consent order or separation agreement and are not strictly locked to the guideline figure — custom structures (for example, one parent covering tuition in lieu of a higher payment) are common. But a court asked to approve or later enforce the deal will still measure it against the children’s reasonable needs, and child support is never permanently unmodifiable: a court can revisit it if circumstances substantially change. G.S. 50-13.7.

Get an accurate number before you agree to anything

A few hundred dollars a month, compounded over a childhood, is real money — and most calculation mistakes happen quietly, in the inputs. At McCrary Pack, PLLC, we run the numbers the right way, pressure-test the other side’s figures, and make sure the worksheet matches how your family actually lives. Reach out to McCrary Pack today for a clear-eyed look at what your child support number should be.

*Last updated: July 2026*

*This article provides general information about North Carolina law and is not legal advice. For advice about your specific situation, consult a licensed North Carolina attorney.*