Child Support in San Francisco County, California
A plain-language guide to child support in San Francisco County, from California's statewide guideline formula to the forms you file at the Superior Court of California, County of San Francisco, the local child support agency, and how to estimate your number and prepare your paperwork without hiring an attorney.
San Francisco is unusual among California counties in that the city and county are one and the same, so every family in the city falls under a single jurisdiction for child support purposes: the Superior Court of California, County of San Francisco, and the city and county's Local Child Support Agency.
Child support here is set the same way it is throughout California, using the statewide uniform guideline formula in Family Code section 4055. That formula takes both parents' net disposable incomes and the timeshare, the share of time the child spends with each parent, and produces a number the law presumes to be correct. San Francisco's compact geography doesn't change the calculation itself, only the practical logistics of getting to court.
There are two paths to a support order in San Francisco. A parent already in a divorce, parentage, or custody case can file a Request for Order (Form FL-300) with an Income and Expense Declaration (Form FL-150). Alternatively, the city and county's Local Child Support Agency, part of the statewide Department of Child Support Services, can open a case directly to establish and enforce support. The forms themselves are identical across California; what's local to San Francisco is simply the single courthouse and agency office that serve the entire city.
Before filing, it's worth estimating your number. Our free California Guideline Child Support Calculator at /tools/california-child-support-calculator can help. If both parents already agree, they can put that agreement into a written stipulation and ask a judge to sign it instead of going through a contested hearing.
Estimate your San Francisco County child support
California uses one statewide guideline formula, so you can get an estimate for a San Francisco County case with our free calculator before you file.
Open the California guideline child support calculatorHow child support is calculated in California
California sets child support with a statewide uniform guideline (Family Code section 4055) that applies the same way in San Francisco County as everywhere else. The formula is based mainly on two things:
- Both parents' net disposable incomes.
- The percentage of time the child spends with each parent (the timeshare).
The guideline amount is presumed to be correct, and courts use a calculator to run the numbers. Because the result depends on accurate income, the Income and Expense Declaration (Form FL-150) you file is what drives your number.
Where child support cases are handled in San Francisco County
Child support in San Francisco County is handled through the Superior Court of California, County of San Francisco, with the county seat in San Francisco, and the county's Local Child Support Agency, which is part of the California Department of Child Support Services. There are two common paths:
- Either parent files a Request for Order (Form FL-300) with an Income and Expense Declaration (Form FL-150) inside a divorce, parentage, or custody case.
- The Local Child Support Agency opens a case to establish, collect, and enforce support, often at no cost to the parents.
Because courthouse locations and the local agency office change over time, confirm current details using the official California Courts court finder:
Find the San Francisco County Superior Court (official California Courts finder)
Local notes for San Francisco County
Because San Francisco is a consolidated city and county, there is a single Superior Court location for family law matters; confirm current details with the official California Courts court finder before you file. The city and county's Local Child Support Agency operates its own office, and up to date contact information is available through the California Department of Child Support Services website.
San Francisco's self-help center assists self-represented parents with completing Form FL-150 and related forms and can explain the filing process, though staff are not permitted to give legal advice about your specific case. Given the high cost of living in San Francisco, being thorough and accurate with the income figures on that form is especially important, since those numbers are what the guideline calculation is built on.
As under California law statewide, child support in San Francisco generally continues until the child turns 18, or 19 if the child is still a full-time high school student living at home and not self-supporting. Either parent can ask the court to modify the order later if income or the parenting timeshare changes.
Guides and tools for your San Francisco County child support case
San Francisco County Child Support FAQs
How is child support calculated in San Francisco?
San Francisco uses California's statewide guideline formula (Family Code section 4055), based on both parents' net disposable incomes and the timeshare with the child. The formula is the same one used in every county in the state. You can estimate your own number with our free California guideline child support calculator.
Where do I file for child support in San Francisco?
Because San Francisco is a combined city and county, there is a single Superior Court of California, County of San Francisco, that handles these cases. You can file a Request for Order (Form FL-300) there, or ask the city and county's Local Child Support Agency to open a case for you.
Does San Francisco's cost of living affect the guideline calculation?
The guideline formula itself doesn't build in a cost of living adjustment; it runs on the actual net income figures and timeshare reported by both parents. Because incomes in San Francisco can be higher, the resulting support figures can be higher too, but the underlying calculation is unchanged. Our calculator at /tools/california-child-support-calculator can help you see an estimate.
Can I handle a child support filing in San Francisco without a lawyer?
Yes, self-represented parents are common, and San Francisco's self-help center provides procedural guidance for completing forms. Virdix is a document preparation service, not a law firm; we help you accurately prepare the required Judicial Council forms, but we do not give legal advice or represent you in court.
This page is general information about California child support procedure in San Francisco County, not legal advice for your situation. The calculator provides an estimate only, and the court determines the actual guideline amount. Court locations, agency offices, and filing details change; always confirm current details with the Superior Court of California, County of San Francisco, the county's Local Child Support Agency, or the official California Courts self-help resources. Virdix is not a law firm and is not a substitute for an attorney.