How Child Support is Calculated in California
California uses an Income Shares model — codified as the statewide guideline formula in Family Code §4055. Both parents' net disposable incomes are combined, and each parent contributes proportionally to a base support amount that scales with the number of children and the percentage of overnight time each parent has.
Estimated Monthly Child Support in California
Below are sample calculations using our California formula. These figures assume the higher-earning parent pays support and exclude childcare or insurance add-ons.
| Your Income | Other Parent | 1 Child | 2 Children | 3 Children |
|---|---|---|---|---|
| $3,000/mo | $3,000/mo | ~$720 | ~$1,260 | ~$1,692 |
| $4,000/mo | $2,500/mo | ~$880 | ~$1,540 | ~$2,068 |
| $6,000/mo | $3,000/mo | ~$1,200 | ~$2,100 | ~$2,820 |
What Can Increase or Decrease Payments in California?
- Each parent's gross monthly income from all sources
- The number of children covered by the order
- Health insurance premiums paid for the children
- Work-related childcare and daycare expenses
- How much overnight parenting time each parent has
- Any extraordinary medical, educational, or special-needs costs
How to File for Child Support in California
- Open a case with California's Department of Child Support Services (or the equivalent state agency).
- Provide proof of both parents' income — pay stubs, tax returns, or a financial affidavit.
- Submit a parenting plan or custody order showing each parent's overnight time.
- Attend a hearing or administrative review where a judge or referee finalizes the order.
Frequently Asked Questions — California Child Support
Does California guarantee a minimum child support amount?
Yes. California sets a presumptive minimum even when the paying parent has very low income, though courts may waive it for incarcerated parents or those receiving public assistance.
How does timeshare affect California child support?
Significantly. The percentage of overnight time the higher-earning parent spends with the child directly reduces the support obligation under the §4055 formula.
Can California parents agree to a different amount?
Parents can stipulate to a non-guideline amount, but the court must confirm both parents understand their rights and that the amount meets the children's needs.
When does California child support end?
Support typically ends at age 18, or 19 if the child is still a full-time high school student living at home. Disabled adult children may receive support indefinitely.