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Child Support in Iowa

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

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Child Support Calculator
Estimate payments using Iowa's Percentage of Income
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Modification Checker
Does your income change qualify?
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Arrears Calculator
Past-due support with 10% interest
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50/50 Custody Guide
Does equal custody eliminate support?

Iowa Child Support Facts — 2026

Formula modelPercentage of Income
Income basisNon-custodial parent only
Support ends at age18
Modification threshold10% income change
Arrears interest rate10% per year
Official agencyIowa Child Support Agency ↗
Iowa uses a percentage of the non-custodial parent's net monthly income.

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