SSI Redetermination at 18 in Washington — What Changes and How to Prepare

Two Things Change at Once

When a child receiving SSI turns 18, the Social Security Administration makes two related shifts. Beginning the first day of the month after the birthday, parental income and asset deeming ends — the agency stops counting the parents' income and resources when calculating the child's eligibility. SSA also evaluates the young adult under the adult disability standard, which is entirely different from the childhood test.

These changes cut in opposite directions. The end of deeming often makes a young adult financially eligible for the first time (many families earned too much for childhood SSI). But the adult disability standard is harder to meet — and that's where most denials happen.

The Childhood Standard vs. the Adult Standard

Under childhood SSI, the question is whether the child's impairment causes "marked and severe functional limitations." The evaluation looks at six domains of functioning: acquiring and using information, attending and completing tasks, interacting with others, moving and manipulating objects, caring for yourself, and health and physical well-being.

The adult standard throws all of that out. The new question: can this person engage in any Substantial Gainful Activity? In 2026, SGA means earning more than $1,690 per month. SSA uses a five-step sequential evaluation that considers the severity of the impairment, whether it meets or equals a listed condition, the individual's residual functional capacity, and whether any jobs exist in the national economy that the person could perform.

For a young adult with intellectual disability or autism who has been in special education their entire life, the gap between these standards can be disorienting. The childhood evaluation focused on how much support they needed. The adult evaluation asks whether they could theoretically hold any job — including low-skill, sedentary work.

The Timeline

SSA is required to conduct the age-18 redetermination within one year of the child's 18th birthday. The notice will ask the young adult (or their representative payee) to complete Form SSA-3368-BK, the Adult Disability Report.

At age 17.5, families can proactively contact the local SSA field office to request the redetermination packet early. Getting a head start on compiling medical evidence gives you significantly more control over the process.

What to Prepare Before the Interview

The medical evidence package should demonstrate that the young adult cannot sustain competitive employment:

• Updated psychological or neuropsychological evaluation — with current IQ scores, adaptive behavior assessment, and functional capacity findings
• Treating physician statements — documenting the nature and severity of the disability, treatment history, and prognosis
• School records — IEP documents showing the level of support required, present levels of performance, and any functional behavior assessments
• Therapist and counselor reports — occupational therapy, speech therapy, behavioral therapy, or vocational rehabilitation assessments
• Daily living statements — detailed descriptions from family members about what the young adult can and cannot do independently

The strongest evidence addresses SSA's specific question: not "does this person have a disability?" but whether the impairment prevents sustained, competitive work at the level of substantial gainful activity.

What Happens to Benefits If You're Denied

If SSA determines the young adult no longer meets the disability standard, benefits don't stop immediately. The cessation notice gives you 60 days to file an appeal (Form SSA-561-U2). If you request benefit continuation within 10 days of the notice, SSI payments continue throughout the appeal process.

Apple Health in Washington After the Redetermination

Washington is a Section 1634 state, meaning SSI approval automatically enrolls the recipient in Apple Health (Medicaid). If SSI is approved at the redetermination, Apple Health coverage continues without a separate application.

If SSI is denied, Medicaid doesn't automatically terminate. Under the Phillips v. Scalese consent decree, Washington's Health Care Authority must independently review whether the individual qualifies for Medicaid under any other program before ending coverage. Families should simultaneously apply for non-MAGI Medicaid through the Washington Connection portal (Form HCA 18-005) to maintain coverage while appealing the SSI denial.

The Washington SSI at 18 & Adult Disability Benefits Guide walks through the complete redetermination sequence — from pre-filing document assembly at age 17.5 through the appeal process — alongside the parallel DDA and Apple Health tracks that run at the same time.

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