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Child Support in New Hampshire

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

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Child Support Calculator
Estimate payments using New Hampshire's Income Shares
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Modification Checker
Does your income change qualify?
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Arrears Calculator
Past-due support with 6% interest
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50/50 Custody Guide
Does equal custody eliminate support?

New Hampshire Child Support Facts — 2026

Formula modelIncome Shares
Income basisBoth parents' income
Support ends at age18
Modification threshold15% income change
Arrears interest rate6% per year
Official agencyNew Hampshire Child Support Agency ↗
New Hampshire uses Income Shares based on combined gross income.

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