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Last Modified on Nov 11, 2026
When Support Doesn’t End at 18: Supporting a Disabled Adult Child in California
By Kent Tierney | Tierney Law Group, P.C.
Most parents expect child support to wind down around a child’s eighteenth birthday, or when they finish high school. For families raising a son or daughter with a serious disability, that date can feel beside the point. The care, the costs and the love don’t stop on a birthday.
California law recognizes that. Under Family Code section 3910, a parent’s duty of support can continue for an adult child who cannot support themselves. And since January 1, 2025, a court can direct those payments into a special needs trust. Here is what parents in the Tri-Valley and across the Bay Area should know.
The usual end point for child support
In most cases, the duty to support a child continues until 18. Family Code section 3901 extends it for an unmarried 18-year-old who is a full-time high school student and not self-supporting, until the child finishes 12th grade or turns 19, whichever comes first. A child with a medical condition documented by a physician that prevents full-time school attendance is excused from the full-time student requirement.
For many families, that is where support ends. Section 3910 is the exception.
What Family Code 3910 says
Section 3910(a) says each parent has an equal responsibility to maintain, to the extent of their ability, their child “of whatever age” who is incapacitated from earning a living and without sufficient means.
Three pieces of that sentence matter:
- “Of whatever age.” There is no age cutoff. The duty can apply to a 19-year-old or a 40-year-old.
- “Incapacitated from earning a living.” The question is whether the adult child is unable to support themselves through work, not simply whether they have a diagnosis.
- “Without sufficient means.” If the adult child has enough resources of their own, the duty may not apply.
The duty is shared. Both parents carry it, each “to the extent of their ability.” That means the court looks at what each parent can reasonably contribute.
The 2025 change: payments to a special needs trust
Many adults with disabilities rely on needs-based public benefits such as SSI and Medi-Cal. Families often worry that a monthly support check paid directly to the adult child could affect eligibility for those programs.
Assembly Bill 2397 addressed that concern. Effective January 1, 2025, section 3910(b) allows the court to order that a support payment be paid to a special needs trust. The statute defines that term by reference to specific federal and California rules (42 U.S.C. section 1396p(d)(4)(A) or (C), and California Code of Regulations, title 22, section 50489.9(a)(3) or (4)).
In plain terms, the law now gives the court a way to route support so it can help the adult child without being paid to them outright. The statute defines a qualifying trust by reference to specific federal Medicaid and Medi-Cal provisions (generally, first-party payback trusts and pooled trusts), so a third-party special needs trust may not fit the definition. Whether a particular trust qualifies, and how payments interact with any specific benefit program, are questions to work through with your family law attorney and, often, a special needs planning or benefits professional.
Section 3910(c) adds that this section does not limit the ordinary duty of support under sections 3900 and 3901.
How these cases tend to come up
A request for adult child support can arise in several ways:
- During a divorce or legal separation, when the parents already know their child will not be self-supporting.
- After a judgment, when an existing child support order is approaching its end date.
- Years later, when a parent who has carried the costs alone asks the other parent to share them.
Because the case turns on facts, these matters can involve medical records, school and vocational history, and financial information from both parents and the adult child. It’s common for the other parent to ask for documents. Thoughtful preparation helps keep the focus on what the statute actually asks: can this adult support themselves, and what can each parent reasonably provide?
Practical steps for parents
If you are caring for an adult child with a disability and wondering about support, consider:
- Gather records early. Documentation of the condition and how it affects your child’s ability to work will usually be central.
- Track the real costs. Care, therapies, housing, transportation and supervision add up. A clear picture helps.
- Look at benefits before you ask. If your child receives or may receive public benefits, talk with a benefits professional about whether payments should go to a special needs trust.
- Don’t wait for the end date. If an existing order is about to end at 18 or 19, it’s worth getting advice before it does.
Frequently asked questions
Does child support automatically continue for a disabled adult child in California?
Not automatically. Section 3910 creates the duty, but a parent usually needs to ask the court to order support, and the court will look at the facts.
Is there an age limit?
The statute says “of whatever age,” so there is no fixed cutoff.
Can support be paid to a special needs trust?
Yes. Since January 1, 2025, section 3910(b) allows the court to order payment to a qualifying special needs trust.
Do both parents have to contribute?
The statute gives each parent an equal responsibility, to the extent of their ability. What that looks like in dollars depends on each parent’s circumstances.
Talk with us
Every family’s situation is its own. If you are raising an adult child who cannot support themselves, and you want to understand your options in the Tri-Valley or greater Bay Area, we’re glad to talk it through. You can schedule a consultation here.
This article is general information, not legal advice, and reading it does not create an attorney-client relationship. Laws change, and every case depends on its own facts.
