Child Support Calculator
California 2026
California uses the Income Shares model — both parents’ net incomes are combined. Updated for 2026 — covers 50/50 custody, arrears, modifications and California child support laws.
* Estimate using official California income shares formula. Courts may deviate based on special circumstances. Consult a California family law attorney for your specific situation.
🌴 How California Calculates Child Support
* 50/50 custody calculations are complex. This is an approximation. Consult a California family law attorney for exact figures.
* California applies 10% annual interest to unpaid child support. There is generally no statute of limitations on child support debt.
* Qualification estimate only. Consult a California family law attorney before filing.
FORMULA How California Calculates Child Support
California Family Code Section 4050-4076 mandates use of the DissoMaster or XSpouse software for guideline calculations. Courts cannot deviate from guideline without specific findings.
AGE When Does Child Support End in California?
Child support in California ends when the child turns 18 — or high school graduation, whichever is later (19 max). Support also ends upon the child’s death, marriage or emancipation. Important: In most cases support does not stop automatically — you need a court order. Stopping payments without a court order creates arrears even after the child reaches the cutoff age.
INTEREST Arrears Interest in California
California charges 10% annual interest on unpaid child support arrears. California’s rate of 10% is among the higher rates in the country. There is generally no statute of limitations on child support debt.
ENFORCEMENT California Child Support Enforcement
California has broad enforcement powers including wage garnishment, tax refund interception, driver’s license suspension, professional license suspension, passport denial, and credit bureau reporting. Criminal charges may apply for significant or long-term non-payment.
MODIFY Modifying Child Support in California
Child support can be modified in California when there is a material and substantial change in circumstances — typically a significant income change, job loss, new children from another relationship, or change in custody. Most states also allow a periodic review every 3 years. File a petition with the court — private agreements to change support are not legally enforceable.
* Click Mark as Paid to track payments. Always keep payment receipts.