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Child Support in Arizona

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

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Child Support Calculator
Estimate payments using Arizona's Income Shares
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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?

Arizona Child Support Facts — 2026

Formula modelIncome Shares
Income basisBoth parents' income
Support ends at age18
Modification threshold15% income change
Arrears interest rate10% per year
Official agencyArizona Child Support Agency ↗
Arizona uses Income Shares with a Schedule of Basic Support Obligations. Support ends at 18 or high school graduation (max 19).

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