How to Calculate Child Support Arrears: The Step-by-Step Method

Before filing any enforcement motion, a custodial parent should calculate the exact arrears balance. An accurate, documented calculation is more persuasive than a general claim that the paying parent is behind.

Building the Arrears Ledger

Start with the date the order was entered and list every required payment since then. For each payment period: the amount due, the amount received (with documentation), and the running balance. Add 10% annual interest on each unpaid amount from the date it was due. The result is a complete arrears statement that the court can verify.

Courts take documented calculations seriously. A custodial parent who arrives with a spreadsheet showing every payment due, every payment received, every shortfall, and the running interest balance is presenting evidence — not just making a claim. The paying parent who disputes it bears the burden of showing the calculation is wrong.

The California Child Support Recovery System gives custodial parents the exact tools, templates, and step-by-step guidance to enforce support orders, calculate arrears, and use every enforcement mechanism available — without paying an attorney to get started. Request your free evaluation here.


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