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Child Support in South Carolina

Free calculator, modification rules, arrears interest, and 50/50 custody guide for South Carolina — 2026.

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Child Support Calculator
Estimate payments using South Carolina's Income Shares
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Modification Checker
Does your income change qualify?
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Arrears Calculator
Past-due support with 14% interest
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50/50 Custody Guide
Does equal custody eliminate support?

South Carolina Child Support Facts — 2026

Formula modelIncome Shares
Income basisBoth parents' income
Support ends at age18
Modification threshold20% income change
Arrears interest rate14% per year
Official agencySouth Carolina Child Support Agency ↗
South Carolina uses Income Shares based on combined gross income.

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