Last updated: September 2026
How is child support calculated in San Diego?
California sets guideline child support with a statewide formula that weighs each parent's income, the percentage of time each parent has the children, and certain deductions. Our office runs the numbers through X-Spouse software. The result is a starting figure, and a judge can adjust it for specific reasons.
We have practiced family law exclusively for over 20 years, and the calculation is the part of a support case our clients ask about first. It is also the part that looks least like what they expect.
This is general information about California family law. It is not legal advice, and reading it does not create an attorney-client relationship.
What goes into the guideline formula?
Three inputs drive most of the result.
- Each parent's net monthly income, after allowed deductions such as taxes and health insurance
- The percentage of time each parent has the children, often called timeshare
- The number of children covered by the order
Add-ons come on top. Childcare tied to work and reasonable uncompensated health costs are common examples.
Timeshare moves the number more than most people expect. On a recent Clairemont case, moving the schedule from 20 percent to 30 percent time with the father changed the monthly figure noticeably, which is why custody and support are rarely separate conversations for us.
What software do San Diego courts use?
The current tool is X-Spouse. Older articles still mention a different program, but the courts have moved on.
The software does the arithmetic. Someone still has to feed it accurate incomes, and that is where cases go wrong. In one Chula Vista matter, missing overtime of about 10 hours a week made the first draft figure wrong, and we had to rerun it before the hearing. Unreported side income and stale pay stubs produce a figure that a judge later revisits.
Which courthouse hears the case?
It depends on where the family lives and where the case was filed. We appear at the Downtown San Diego, Vista, El Cajon, and Chula Vista family courthouses, and our office is at 591 Camino De La Reina in Mission Valley, close to the Interstate 8 and Highway 163 interchange.
| Input | Why it matters |
|---|---|
| Net income of each parent | Sets the base of the guideline figure |
| Timeshare percentage | Shifts the amount up or down as the schedule changes |
| Number of children | Increases the total order |
| Childcare and health costs | Added on top of the base figure |
What does a support case cost?
We bill $300 per hour. A retainer for a new case typically ranges from $4,700 to $7,500, and it depends on the matter. Nobody should treat those numbers as a quote for a specific case.
The first consultation is free. Call or text (619) 250-2683 for a quick response.
If we have worked with you and you want to share your experience, a Google review that mentions the service and your part of San Diego County helps other families find accurate information.
See our child support practice page and the guide on working with a child support attorney for related detail.