California Family Code Section 3910 requires each parent to financially support an adult child who cannot earn a living because of an incapacitating condition and who lacks sufficient means to get by alone.1California Legislative Information. California Code FAM 3910 – Support of Adult Child Unlike standard child support, which ends at 18 (or 19 if the child is still in high school), this duty has no age ceiling and can last as long as both conditions remain true. The statute also lets the court route the payments into a special needs trust so the money doesn’t disqualify the adult child from SSI or Medi-Cal.
What the Statute Requires
Section 3910(a) gives each parent an “equal responsibility to maintain, to the extent of their ability,” a child of any age who is “incapacitated from earning a living and without sufficient means.” Three phrases carry the weight. Equal responsibility means both parents share the duty, not just the higher earner. To the extent of their ability means the court considers what each parent can actually afford. Without sufficient means means the adult child doesn’t already have resources adequate to cover their own support.
Both conditions must be met. Missing either one defeats the claim.
Incapacitated From Earning a Living
The statute uses “incapacitated” rather than “disabled.” The question is not whether a diagnosis exists on paper but whether the condition actually prevents the person from earning a livelihood. Courts look at medical records, treating physician testimony, and sometimes vocational expert opinions. In In re Marriage of Drake, the adult child had chronic paranoid schizophrenia and could not care for himself, let alone hold a job.2Justia. In re Marriage of Drake That severity is typical of successful claims, though the statute names no particular diagnosis.
Without Sufficient Means
An incapacitated adult child with enough resources of their own is not entitled to support under Section 3910. The Drake court framed “sufficient means” around whether the child would otherwise become a public charge, meaning whether they would end up relying entirely on government assistance without parental help.3FindLaw. In re the Marriage of Miriam J. and James Hughes Drake The court will consider Social Security disability benefits, SSI, trust distributions, and any other income. A well-funded trust or substantial benefit stream can defeat a claim even where the incapacity is clear.
How the Support Amount Is Calculated
California’s standard child support guideline formula, familiar from cases involving minor children, can apply here too. Drake held that the Legislature’s use of the unqualified word “child” throughout the guideline statutes was a “conscious, deliberate choice intended to refer to any child owed a duty of support by a parent,” and that judges may “adapt or depart from the formula when warranted by the special circumstances of particular disabled adult children or their parents.”2Justia. In re Marriage of Drake
In practice the court starts with the same inputs used for minor child support: each parent’s income, tax filing status, and time the child spends with each parent. The judge then has wide discretion to adjust. An adult child in a group home with round-the-clock care needs presents a very different financial picture than a minor splitting time between two households, and the order reflects that. Courts weigh the adult child’s specific living expenses, medical costs, and existing benefits when setting the final number.
Paying Into a Special Needs Trust
This is where Section 3910 collides with federal benefits law. Direct support payments to a disabled adult can reduce or eliminate SSI, and losing SSI often means losing Medi-Cal, which may be covering tens of thousands of dollars in annual care.
Section 3910(b), added by Assembly Bill 2397, lets the court direct support payments into a special needs trust that meets the federal Medicaid trust requirements under 42 U.S.C. ยง 1396p(d)(4).1California Legislative Information. California Code FAM 3910 – Support of Adult Child Money in a properly structured trust is not counted as the beneficiary’s resource for SSI purposes, so the adult child can receive support without losing benefits. A 2024 California appellate decision emphasized that the Legislature added this provision specifically to “preserve funds that can improve the beneficiary’s quality of life without disqualifying that person from eligibility for SSI and other benefits.”
Federal rules on what the trust actually pays for are strict. Cash and cash equivalents given to the beneficiary can reduce SSI dollar for dollar, and payments for food or shelter can trigger a partial SSI reduction even when paid to a landlord directly.4Social Security Administration. POMS SI 00830.420 – Child Support Payments Trust administration matters, and for meaningful support amounts professional administration is usually worth the cost.
Filing a Petition for Support
The process begins with a petition in family court, typically filed by the adult child, a guardian, a conservator, or another representative. The petition must establish incapacity and lack of sufficient means and should detail the parents’ financial circumstances. Filing fees vary by county.
At the hearing, the petitioner usually submits medical records documenting the incapacitating condition, along with financial records showing the adult child’s income and expenses. The parent responding provides evidence of their own income, debts, and other obligations. Courts sometimes appoint independent medical or vocational experts when the evidence is contested.
After the hearing, the judge issues an order specifying the amount, the payment frequency, and whether payments go directly to the adult child or into a special needs trust. The order stays in effect until modified or terminated.
Modifying the Order Later
Family Code 3651 allows a support order to be modified or terminated “at any time as the court determines to be necessary.”5California Legislative Information. California Code FAM 3651 – Modification or Termination of Support Order Either side can move to increase, decrease, or end the obligation. Common triggers are a significant change in a parent’s income, a change in the adult child’s condition or needs, and a change in available government benefits.
One important limit: a modification generally cannot reach back before the date the motion was filed.5California Legislative Information. California Code FAM 3651 – Modification or Termination of Support Order A parent who loses a job in January but waits until June to file will still owe the original amount for those five months. Until the court issues a new order, the existing one is what governs. Act quickly when circumstances change.
Enforcement When a Parent Doesn’t Pay
California uses aggressive tools to collect. Family Code 5230 makes earnings assignment orders (wage withholding) mandatory whenever a court orders support. The employer deducts the amount from the parent’s paycheck and sends it to the recipient.6California Legislative Information. California Code FAM 5230 – Earnings Assignment Order for Support It’s the default, not a last resort.
Beyond wage withholding, Family Code 290 authorizes enforcement through contempt of court, which can carry fines or jail time, as well as execution against assets and appointment of a receiver.7California Legislative Information. California Code FAM 290 – Enforcement of Judgment or Order Property liens and bank levies are also available. A parent who stops paying without seeking a formal modification faces compounding legal and financial consequences.
Related Federal Benefits: Taxes and Insurance
Section 3910 is a state family-law rule, but two federal issues sit next to it and often matter to families paying support.
For federal taxes, the IRS allows a permanently and totally disabled child to be claimed as a qualifying child dependent with no age limit, provided the child lives with you for more than half the year, you provide more than half of their support, and they do not file a joint return with a spouse.8Internal Revenue Service. Dependents 2 If the adult child lives elsewhere, such as in a care facility, they may still qualify as a qualifying relative dependent. That path requires you to provide more than half their support and requires their gross income to fall below an annually indexed threshold ($5,050 for the 2024 tax year).9Internal Revenue Service. Dependents SSI is not counted as gross income for this purpose; SSDI may be, depending on the amount. Claiming the dependent can open up the dependent care credit and may improve medical expense deductions if you’re paying healthcare costs.
For health coverage, the Affordable Care Act requires most plans to cover dependent children to age 26, and many employer and individual plans allow continued coverage past that age if the disability began before 26, the child cannot support themselves, and the condition meets the plan’s definition of disability. The parent typically submits medical documentation and a dependent certification form, with periodic recertification. Contact the plan administrator well before the 26th birthday, because a missed certification window can create a gap that is difficult to fix.