How is child support calculated in North Carolina?

Using the income shares model under N.C.G.S. § 50-13.4: both parents' gross incomes are combined and referenced against the state's guideline schedule, based on the concept that a child should receive the same proportion of parental income they would have received if the family had stayed together.

What are North Carolina's three worksheets?

Worksheet A applies when one parent has primary physical custody. Worksheet B applies to shared and equal physical custody, when each parent has at least 123 overnights and assumes financial responsibility during their custodial time. Worksheet C applies to split custody, with at least two children and each parent primary custodian of at least one.

Is there a cap on combined income used in the calculation?

Yes. The combined income cap is $40,000 per month ($480,000 annually), under guidelines updated January 1, 2023.

How do I request a modification in North Carolina?

Courts may modify support based on a substantial change in circumstances, or automatically after 3 years. A difference of 15% or more between the existing order and what the guidelines would produce with current income and circumstances is presumed to be a substantial change.

How is child support enforced in North Carolina?

Income withholding by employers is the most effective collection method: the employer deducts the specified amount and sends it to NC Child Support Centralized Collections within 7 days. Withholding can be immediate, and a delinquency equal to one month's support can trigger withholding and show-cause procedures.

North Carolina, United States

North Carolina Child Support: A Parent's Guide

How child support works in North Carolina, in plain English: the income shares worksheets, modification, and income withholding enforcement.

Legal sources reviewed: August 10, 2026

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In short: North Carolina uses the income shares model across three distinct worksheets depending on the custody arrangement, applied to combined incomes up to $40,000/month. Modification is available automatically after 3 years, or sooner if the recalculated amount differs by 15% or more, and enforcement leans on fast, largely automatic income withholding.

This is an educational overview written for parents, not lawyers. It isn't legal advice. For anything beyond general understanding, talk to a licensed North Carolina family law attorney.

What North Carolina generally provides

Under N.C.G.S. § 50-13.4, North Carolina uses the income shares model, developed under the federally funded Child Support Guidelines Project, based on the principle that child support is a shared parental obligation and a child should receive the same proportion of parental income they'd have received if the parents lived together.

Important terminology

Worksheet A: used when one parent has primary physical custody.
Worksheet B: used for shared/equal physical custody, where each parent has at least 123 overnights and covers expenses during their own time.
Worksheet C: used for split custody, with at least two children and each parent as primary custodian of at least one.

How the calculation works

Three worksheets for three custody structures

North Carolina doesn't use a single universal worksheet, the applicable one depends on the actual custody arrangement. Worksheet A covers primary-custody cases. Worksheet B covers shared and equal physical custody, applying once each parent has at least 123 overnights a year and assumes the other financially covers the child during their own custodial time. Worksheet C covers split custody, where there are at least two children and each parent has primary custody of at least one.

Combining income against the guideline schedule

All three worksheets start from the same underlying principle: combining both parents' gross incomes and referencing the state's guideline schedule, updated January 1, 2023, with a combined income cap of $40,000/month ($480,000 annually). Health insurance premiums, childcare expenses, and other extraordinary costs are added on top.

Requesting or defending a modification

Courts may modify support on a showing of a substantial change in circumstances, or automatically after 3 years from the last order. A difference of 15% or more between the existing order amount and what the guidelines would currently produce, based on present income and circumstances, is presumed to be a substantial change, simplifying the case for a parent seeking a recalculation. See the child support calculator and guideline finder for jurisdiction-specific calculation sources and guidance.

How enforcement works

Income withholding by employers is North Carolina's most effective collection tool: the employer deducts the specified amount from the paying parent's income and sends it to NC Child Support Centralized Collections (NCCSCC) within 7 days of the deduction. Withholding can begin immediately in many cases, and a delinquency equal to one month's support can trigger withholding and show-cause procedures. Additional tools include contempt proceedings, license revocation, and child support liens.

Common questions

Which worksheet applies to my case? It depends on the actual overnight count and custody structure, not just the label in your custody order, confirm your real schedule against the 123-overnight threshold for Worksheet B eligibility.

Do I need to wait 3 years to modify? No, a substantial change (including a 15%+ recalculated difference) can support an earlier modification; the 3-year mark is simply an automatic trigger regardless of other changes.

What if my co-parent isn't paying? Contact North Carolina Child Support Services (CSS), part of NCDHHS, which can pursue income withholding, contempt, license revocation, and liens.

Practical considerations

Because North Carolina's worksheet choice hinges on a specific overnight count (123 nights for Worksheet B), tracking your actual schedule matters for getting the right calculation, not just what the order nominally says, worth confirming with NCDHHS Child Support Services or a North Carolina family law attorney. For the custody rules underlying these worksheets, see the North Carolina custody guide.

Official North Carolina resources

FAQ

Questions, answered

This information is provided for educational purposes only and is not legal advice. Family law varies by individual circumstances and may change over time. Consult a qualified attorney or appropriate official resource for advice about your situation.