California Child Support Laws (2026 Update)

The statewide guideline formula

California's child support formula, set out in Cal. Fam. Code § 4055, is:

Nobody calculates this by hand. In practice, the parties and the court use software — DissoMaster, Xspouse, or the free Judicial Council Child Support Calculator — that implements the formula.

The guideline amount is presumptively correct. Courts can order a different amount only in specific enumerated circumstances under Cal. Fam. Code § 4057(b) — for example, where the child has special needs, the guideline would be unjust or inappropriate for one of the listed reasons, or the parents agree to a different amount and the court finds it adequate.

What goes into the calculation

Income

"Income" for guideline purposes is broad. Under Cal. Fam. Code § 4058, it includes:

• Wages, salaries, commissions, bonuses.
• Self-employment earnings (net of ordinary and necessary business expenses).
• Rental income (net of expenses).
• Interest and dividend income.
• Trust income.
• Pensions, annuities, disability payments.
• Unemployment insurance benefits.
• Workers' compensation.
• Social Security (retirement and disability).
• Spousal support received from anyone other than the other parent in the current case.

Excluded: means-tested public assistance (CalWORKs, SSI, food stamps).

Timeshare

Timeshare is the percentage of time each parent has primary physical responsibility for the child. It is not simply the count of overnights — it's an "approximate percentage" of time responsible. Timeshare is one of the most contested inputs in California child support because the formula is highly sensitive to it, especially in the 30–70% range.

Deductions from income

Net disposable income is calculated after allowed deductions including federal and state income tax withholding, FICA/self-employment tax, mandatory retirement contributions, health insurance premiums, mandatory union dues, and existing child or spousal support paid to other households.

Mandatory & discretionary add-ons

Beyond guideline support, Cal. Fam. Code § 4062 requires courts to order two categories of additional support:

Mandatory (§ 4062(a))

• Work-related child care. Reasonable childcare costs incurred by a parent while working or attending training/education for job skills.
• Health-care costs. Reasonable uninsured health-care costs for the child.

Discretionary (§ 4062(b))

• Educational expenses beyond basic public schooling — private school tuition, tutoring, special-needs education.
• Travel expenses for visitation, especially in long-distance custody arrangements.
• Costs of extracurricular activities (music lessons, sports, etc.) — increasingly ordered where consistent with the family's pre-separation lifestyle.

Add-ons are typically split 50/50 between the parents but can be allocated in proportion to income or in some other reasonable way.

High-earner cap

Under Cal. Fam. Code § 4057(b)(3), where the payor parent's net disposable income substantially exceeds the amount needed to meet the child's needs consistent with the parents' station in life, the court may deviate downward from strict guideline. This is the so-called "high-earner defense," used in cases where the guideline would produce hundreds of thousands of dollars per year in support that far exceeds even generous child needs.

Deviation requires findings on the record — the court cannot simply reduce support to a round number. The parent must document that the child's actual needs are being met at a lower amount.

How long support lasts

California child support ends when the child:

• Turns 18 and has graduated from (or is not attending) high school full-time.
• Turns 19 (whether or not still in high school).
• Gets married.
• Becomes emancipated.
• Dies.
• Joins the military.

Cal. Fam. Code § 3901(a) extends child support past 18 for full-time high-school students who are unmarried, but only until they turn 19 or complete high school, whichever comes first.

Adult disabled children

Cal. Fam. Code § 3910 requires parents to support an adult child who cannot maintain themselves due to incapacitation. This support obligation has no age cutoff and continues as long as the incapacitation continues.

Modifying an existing order

Either parent can request a modification if there has been a material change in circumstances since the current order. Common triggers:

• A significant change in either parent's income (commonly 20% or more, though there is no fixed threshold).
• A change in the timeshare (custody schedule).
• A change in the child's needs (medical, educational).
• Loss of employment or a new job for either parent.
• Emancipation of another child (which changes the allocation).

File Form FL-300 (Request for Order) in the same court that issued the current order. Modifications are generally retroactive to the date of filing, not to the date of the change — so filing quickly matters.

Enforcement through DCSS

The California Department of Child Support Services (DCSS) provides enforcement services free of charge for any parent — you do not have to have been on public assistance to open a case. Enforcement tools include:

• Income Withholding Order (IWO) — automatic wage garnishment via Form FL-195.
• Tax refund interception — federal and state refunds are intercepted for arrears.
• Bank levies — DCSS can levy bank accounts for arrears.
• License suspension — driver's license, professional licenses, and recreational licenses can be suspended for non-payment.
• Credit reporting — arrears are reported to credit bureaus.
• Passport denial — US State Department will deny passport applications for parents with arrears over $2,500.
• Contempt proceedings — willful non-payment can lead to jail time.

Interstate cases & UIFSA

California has adopted the Uniform Interstate Family Support Act (UIFSA), codified at Cal. Fam. Code § 5700.101 et seq. UIFSA governs cases where the paying parent, receiving parent, and child are not all in the same state. Key principles:

• Only one state at a time has continuing exclusive jurisdiction to modify an order.
• Every state must enforce a valid order issued by another state.
• A wage-withholding order issued in one state can be sent directly to an employer in another state without a separate court proceeding.

Emancipation & adult disabled children

Beyond automatic termination at 18/19, a court can declare a minor emancipated under Cal. Fam. Code § 7120 upon a showing that the minor is at least 14, willingly living apart from the parents with their consent, managing their own finances, and their source of income is not derived from any criminal activity. Emancipation terminates child support for that child.

State agency contact

Compared to neighboring states

Related California laws

• California child custody
• California divorce laws
• California adoption laws
• California marriage laws
• California prenuptial agreements
• California wills and estates
• California statute of limitations
• California expungement process

Related comparisons

Related guides

Recent changes

• January 1, 2024
  SB 343 updated statewide income-withholding and enforcement procedures; verify current forms with your local DCSS office.
• January 1, 2018
  AB 1058 expanded DCSS services and streamlined the process to open a case for any parent (not just former CalWORKs recipients).
• 2013
  California modernized the guideline calculator with the Judicial Council's web-based tool, replacing county-specific implementations.

Sources

Frequently asked questions