ATTENTION: This calculator has been decertified as it does not yet reflect the tax changes in the July 2025 federal budget bill. You may continue to use this calculator to estimate your child support order while the updates are being made, but certain tax calculations may not be correct.

For a free certified calculator, visit your family law facilitator’s office at your local courthouse. Other certified calculators are available on the Judicial Council website.

At all times, this calculator provides only an estimate and is never a guarantee of the amount of support that may be ordered. The county child support commissioner or family law judge has the final authority to determine the amount of a child support order.

Agree & Proceed to Guideline Calculator

GUIDELINE CALCULATOR

Calculating Support

The California Child Support Guideline Calculator is based on the same legal guidelines used in California courts, and can be used to estimate the amount of child support that may be ordered in your case.

This calculator provides only an estimate and is not a guarantee of the amount of support that will be ordered. The county child support commissioner or family law judge has the final authority to determine the amount of a child support order.

If you have any questions about the child support guidelines, you should talk with a lawyer or contact a Family Law Facilitator. You can download the guideline calculator user guide for more help with the tool.

If you have unpaid child support debt, you can figure out how long it will take to pay it off with our Arrears Payoff Calculator.

Qualified Business Income Deduction

The Qualified Business Income Deduction calculator is an Excel tool to help individuals using the Guideline Calculator figure out the business income deductions they may need to enter in the Monthly Deduction Information section of the Guideline Calculator. This Excel tool gives an estimated amount based on the information you enter. Do not use this tool for tax returns or anything other than estimating support. Only this original Excel tool should be used. Any version provided by others may have different formulas affecting the result. This tool has been certified by an independent Certified Public Accountant.