New Hampshire SSI Age 18 Redetermination: What to Expect and How to Prepare

What the Age-18 Redetermination Actually Is

When a child on SSI turns 18, the Social Security Administration doesn't just renew their benefits. They throw out the childhood disability determination and start fresh using adult standards. The SSA calls this the age-18 redetermination, and it's functionally a brand-new application.

Under adult rules, the question changes from "Does this child have marked and severe functional limitations?" to "Can this adult perform Substantial Gainful Activity?" In 2026, SGA means earning more than $1,690 per month for non-blind individuals or $2,830 for individuals who are legally blind.

The redetermination process typically begins within a year of the beneficiary's 18th birthday. SSA sends a notice and the Adult Disability Report (Form SSA-3368), which must be completed with detailed medical, educational, and vocational documentation.

Why the Adult Standard Catches Families Off Guard

A child who clearly qualified under childhood standards can fail the adult review. The childhood standard measures functional limitations across six domains — acquiring and using information, attending and completing tasks, interacting with others, moving about, caring for oneself, and health and physical well-being. It's a broad lens.

The adult standard is narrower: can you work? If the SSA's medical consultants believe the individual could perform any job that exists in the national economy — even a simple, unskilled position — the claim gets denied. The individual's actual ability to find or hold such a job doesn't factor into the decision.

Nationally, about one-third of childhood SSI recipients lose benefits at the age-18 redetermination. In New Hampshire, the review is handled by the state's Disability Determination Services (DDS) office, which applies the same five-step sequential evaluation process used for all adult disability claims.

Evidence That Strengthens the Case

The evidence package needs to demonstrate that the individual's disability prevents competitive employment. The SSA isn't looking for a diagnosis — they're looking for documented functional limitations.

Clinical records are the foundation. Gather diagnostic evaluations, treating physician notes, and hospitalization records. For individuals with intellectual or developmental disabilities, neuropsychological evaluations that include IQ testing and adaptive behavior assessments carry significant weight.

Educational records fill in the functional picture. The current IEP, especially the Present Levels of Academic Achievement and Functional Performance section, documents daily functioning in concrete terms. Triennial evaluations, speech-language assessments, and occupational therapy reports add supporting detail.

Vocational evidence is often overlooked but matters. If the individual participated in Pre-Employment Transition Services through NHVR, any situational assessments or supported employment evaluations showing the level of support needed for work tasks directly address the SGA question. Sheltered workshop reports that document supervision ratios and productivity levels can demonstrate that earnings don't reflect competitive work capacity.

Third-party statements from teachers, job coaches, and direct support professionals who observe the individual daily can fill gaps that clinical records miss — especially for behavioral and social functioning.

One practical tip specific to New Hampshire: under RSA 332-I:1, medical providers can charge up to $50 for copies of medical records ($5 for the first page, $0.41 for pages 2–50, $0.30 thereafter). They must deliver records within 30 days of a written request. Budget for this cost early.

The Financial Side at 18

At 18, parental income and resources stop counting. Only the individual's own income and assets matter for SSI eligibility. The 2026 federal benefit rate for an individual is $994 per month, and the countable resource limit is $2,000.

New Hampshire adds an Optional State Supplement that varies by living arrangement — ranging from $27 per month for someone in a Medicaid-funded nursing facility to $221 for someone in a residential care facility. For most young adults living independently or with family, the supplement is $41 per month, bringing the combined payment to $1,035.

The state supplement has its own asset limit of $1,500 — lower than the federal $2,000. So even if you're under the federal limit, having more than $1,500 in countable assets can cost you the state supplement.

What to Do If the Redetermination Starts

When the SSA-3368 arrives, take it seriously. Complete it thoroughly — vague answers or missing sections give DDS less to work with. Attach your evidence package rather than waiting for DDS to request records piecemeal.

If DDS schedules a Consultative Examination, the individual should attend. Missing the appointment can result in a denial based on insufficient evidence.

Keep a file of everything submitted and every communication with the SSA. If the case moves to appeal, this documentation trail becomes essential.

The Medicaid Connection

Here's what makes the NH redetermination especially high-stakes: New Hampshire is a Section 209(b) state, meaning SSI approval does not automatically grant Medicaid. A separate Medicaid application must be filed with DHHS through the NH EASY portal. Losing SSI doesn't just mean losing cash — it can trigger a gap in healthcare coverage that disrupts waiver services and medical care.

Families should file the adult Medicaid application on the same day they address the SSI redetermination. This parallel filing prevents gaps and keeps BDS waiver services on track.

The New Hampshire SSI at 18 & Adult Disability Benefits Guide includes a filing-day checklist, evidence organization worksheet, and timeline tracker for coordinating SSI, Medicaid, and BDS applications simultaneously.

See more New Hampshire guides →