How do I use the official state calculator to estimate my guideline child support obligation in California?

To estimate your child support obligation, you use the official California Guideline Child Support Calculator website by inputting specific financial data for both parents. The calculator applies the statewide formula to generate an estimated monthly support amount. Here is how to use the official state calculator: Step 1: Access the Official Calculator Go to the California Department of Child Support Services website at `childsupport.ca.gov`. Find and click the link for the "Guideline Calculator." This is the only calculator courts officially recognize for estimating support. Step 2: Gather Your Financial Documents Collect your recent financial records. You will need your last two months of pay stubs, your most recent federal and state tax returns (Form 1040, W-2s), and records of any other income. You will also need information about health insurance premiums you pay for the children, property taxes, mortgage interest, and any mandatory union dues or retirement contributions. Step 3: Enter Case Information Input the number of children you have with the other parent. The most critical entry in this section is the "timeshare" or custody percentage. You must enter the percentage of time the children spend with you and the other parent. If you do not know the exact percentage, the calculator has a tool to help you estimate it based on your custody schedule. Step 4: Enter Income and Deduction Information Enter the gross (pre-tax) monthly income for both yourself and the other parent. Then, enter all allowed monthly deductions, such as health insurance premiums paid for the child(ren), property taxes, and mandatory retirement contributions. Use the documents you gathered in Step 2 to ensure these numbers are accurate. Step 5: Calculate and Review the Estimate Once all information is entered, click the "Calculate" button. The tool will provide an estimated monthly child support payment. Review this number carefully. You can adjust the numbers you entered (for example, to see how a change in income would affect the amount) and recalculate as many times as you need. Important Details and Nuances: The "timeshare" percentage is one of the most significant factors in the calculation. Gross income includes more than just wages; it can include commissions, bonuses, self-employment income, unemployment benefits, and disability benefits. Be as accurate as possible, as small errors in income or timeshare can significantly change the result. Warnings and Limitations: The result from this calculator is an estimate, not a final court order. A judge has the final authority to set the child support amount and can deviate from the guideline for specific reasons. The calculator is a tool for simple situations; it may not accurately reflect complex scenarios involving self-employment, hidden income, or "new spouse" income. This is general information and does not constitute legal advice. For complex situations, or if you and the other parent disagree on income or timeshare, you should consult with a qualified California attorney to understand your rights and obligations.
Disclaimer: This information is for general guidance only and should not be considered as legal advice. Please consult with a qualified attorney for specific legal matters.
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Updated: August 14, 2025
Family Law

Divorce, child custody, domestic relations, and family disputes

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