Children's SSI in 2026: How 20 CFR 416.924 and 416.926a Use Three Steps and Six Domains of Functioning to Decide Every Kid's Claim

Published June 8, 2026 by Anthony Albert, Benefits Research Director

Adult SSDI and SSI claims run through the 5-step sequential evaluation. Kids don't. A child's SSI claim runs through a completely different framework written into 20 CFR 416.924 and 20 CFR 416.926a. It's only three steps on paper, but Step 3 is where the entire claim usually lives. That's where SSA looks at six domains of functioning and decides whether your kid is, in regulatory language, marked-and-severe limited or has marked or extreme limitations in enough domains to functionally equal the Listings.

If you're a parent applying for SSI for your child, this is the framework you need to understand cold. The decision isn't whether your kid has a diagnosis. It's whether the limitations show up across multiple areas of how the child functions day to day. Two kids with the same diagnosis can get opposite results because one's functioning is worse across more domains.

This piece walks through the three-step structure, the income and resource side most parents trip on, what each of the six domains actually covers, what "marked" and "extreme" really mean, and how to build a record that wins.

The Statute and the Rules Behind Children's SSI

Children's SSI was changed by the Personal Responsibility and Work Opportunity Reconciliation Act of 1996. Before 1996, SSA used an IFA (Individualized Functional Assessment) for kids. PRWORA replaced IFA with the current functional equivalence framework under Section 1614(a)(3)(C)(i) of the Social Security Act. The regulations implementing this are 20 CFR 416.901-998, with the heart of the medical evaluation in 416.924 (three-step sequential for kids) and 416.926a (functional equivalence and six domains).

The statute defines a child as anyone under age 18. For SSI eligibility purposes, a "child" is unmarried, under age 18, and not the head of a household. A 17-year-old married teenager applying for SSI is evaluated as an adult under the 5-step framework. An 18-year-old who has been on child SSI hits the age-18 redetermination, which is a separate process. See our age-18 SSI redetermination deep-dive for that transition.

2026 Money Numbers Parents Must Know First

The income side often kills child SSI claims before the medical side even runs. Even when the child clearly has a serious impairment, deemed parental income above the threshold makes the child financially ineligible. Parents who have heard "your kid will definitely qualify medically" are routinely shocked when the denial notice cites income, not medical.

The Three-Step Sequential for Kids (20 CFR 416.924)

Step 1: Substantial Gainful Activity (SGA) for the Child

If the child is engaging in SGA (earning above $1,690/month in 2026, the non-blind adult SGA threshold), the claim is denied. In practice, very few minors are at SGA. This step gets cleared almost automatically for school-age kids and infants. Where it can matter: teenage children with part-time jobs. SSA looks at gross earnings minus IRWE (Impairment-Related Work Expenses) and any subsidies.

Step 2: Severity

The child must have a medically determinable impairment (MDI) that is "severe." Severity for kids means the impairment causes more than minimal functional limitations. The 12-month durational requirement applies: the impairment must have lasted or be expected to last at least 12 months, or result in death. Combinations of impairments are evaluated together under 20 CFR 416.924a.

The bar at Step 2 is low. Most claims that get this far have a documented diagnosis backed by treatment records. Step 2 isn't where claims usually fail.

Step 3: Listings (Adult or Childhood Listings) and Functional Equivalence

This is the big one. The child meets, medically equals, or functionally equals a Listing of Impairments. SSA uses the same Listings adults use (Part A) for general medical Listings AND the Part B childhood-specific Listings (the 100.00 through 112.00 series). The Listings most often relevant to kids:

• 100.00 Growth Failure
• 101.00 Musculoskeletal Disorders (juvenile)
• 102.00 Special Senses and Speech
• 103.00 Respiratory Disorders
• 104.00 Cardiovascular
• 105.00 Digestive
• 106.00 Genitourinary
• 107.00 Hematological Disorders
• 108.00 Skin
• 109.00 Endocrine
• 110.00 Congenital Disorders Affecting Multiple Body Systems
• 111.00 Neurological
• 112.00 Mental Disorders (childhood version)
• 113.00 Cancer
• 114.00 Immune System

If the child's documented impairment matches a Listing criteria exactly, that's "meets a Listing." If it doesn't match exactly but is medically equivalent in severity, that's "medical equivalence" (20 CFR 416.926). If neither of those applies, SSA looks at functional equivalence under 416.926a. This is where the six domains come in.

The Six Domains of Functioning (20 CFR 416.926a)

SSA evaluates the child's functioning compared to other children the same age across six domains. For each domain, the child is rated as having no limitation, less than marked limitation, marked limitation, or extreme limitation. To functionally equal the Listings, the child must have either:

• Marked limitations in TWO domains, OR
• Extreme limitation in ONE domain

The whole game at Step 3 functional equivalence is hitting one of those thresholds. Here's what each domain covers.

Domain 1: Acquiring and Using Information

How well the child learns and uses information at school and at home. This covers reading, math, writing, vocabulary, following directions, retaining what was taught, comprehension. Marked limitation is roughly 2 standard deviations below age peers on standardized achievement testing, persistent failure in core subjects despite intervention, or IEP documentation showing inability to progress at grade level. Extreme is 3+ standard deviations or essentially nonexistent academic functioning.

Domain 2: Attending and Completing Tasks

How well the child focuses, sustains attention, and finishes activities at the pace expected for the age. Includes ability to filter distractions, follow multi-step instructions, transition between tasks, and persist on age-appropriate work. ADHD cases live here. Marked limitation = significant problems demonstrated across school, home, and other settings (multi-setting requirement is key per SSR 09-4p). Extreme = inability to sustain attention for more than very brief periods even with extensive support.

Domain 3: Interacting and Relating with Others

Social functioning. How the child forms and sustains relationships with peers, family, teachers, and other adults. Includes cooperation, empathy, expressing needs, accepting authority, communication. Autism spectrum disorder claims often turn on this domain. Marked limitation = serious impairment in social functioning that prevents normal peer relationships. Extreme = essentially absent ability to relate to others.

Domain 4: Moving About and Manipulating Objects

Gross and fine motor functioning. Walking, running, climbing, stair-use for gross motor; writing, drawing, dressing, using utensils, manipulating small objects for fine motor. Cerebral palsy, spina bifida, muscular dystrophy, severe orthopedic conditions, and significant fine motor deficits live here. Marked limitation = significant motor impairment compared to age peers. Extreme = inability to perform age-appropriate movement.

Domain 5: Caring for Yourself

Self-care and self-regulation. Personal hygiene, dressing, eating, basic safety awareness, emotional regulation, ability to make decisions appropriate to age. Includes the developmental milestones expected at each age band. Marked limitation = significant inability to care for self at age-appropriate level. Extreme = essentially absent self-care capability.

Domain 6: Health and Physical Well-being

The cumulative physical effects of the impairment and treatment. Frequency of hospitalizations, medication side effects, episodes of decompensation, missed school days due to medical issues, ongoing physical symptoms. This domain captures the kid who has frequent serious medical interventions. Marked limitation typically requires multiple hospitalizations per year or chronic significant symptom burden. Extreme = recurrent hospitalizations, life-threatening episodes, or severe ongoing functional impairment from the medical condition itself.

Parental Income and Resource Deeming

SSA uses spousal/parental deeming under POMS SI 01310 to determine the child's countable income. The parent's income is taken, certain allocations are deducted (for the parent's own living expenses and for any ineligible siblings), and what remains gets deemed to the child. The 2026 numbers move with the COLA each year.

The deeming formula for a single-parent household with one disabled child:

1. Start with parent's gross monthly income.
2. Subtract $20 general income exclusion.
3. Subtract $65 earned income exclusion (if earned).
4. Divide earned income (after exclusions) by 2.
5. Subtract ineligible-child allocation for each non-disabled sibling under 18 ($502/month per child in 2026).
6. Subtract parent's living allocation ($1,003 single, $1,505 couple).
7. What's left is deemed to the disabled child as unearned income.
8. Apply the child's individual $20 general exclusion to that deemed amount.
9. Result is countable income for SSI eligibility. If above $1,003 FBR, child is financially ineligible.

For California families, also see our California disability page for the state supplementary payment which can stack on top of federal SSI. For Texas families, see our Texas disability page.

Building Evidence That Wins at Step 3

The single biggest predictor of a successful child SSI claim isn't the diagnosis. It's the depth and consistency of the functional evidence across school, home, medical, and therapy records. SSA decision-makers (and ALJs on appeal) want to see the same limitations documented from multiple independent sources. Six pieces of evidence to gather before filing:

1. IEP and 504 plan documents (full file, not just current). Include eligibility evaluations, present-levels statements, accommodations, and progress reports.
2. Teacher narratives and behavioral reports. Specific descriptions of in-class functioning are gold. SSA Form SSA-5665-BK is the teacher questionnaire SSA may send. Ask the school to complete it thoroughly.
3. School district psychoeducational evaluations. Standardized achievement scores, IQ testing, behavior rating scales (BASC-3, Connors, Vineland).
4. Treating clinician records. Pediatrician, child psychiatrist, neurologist, developmental pediatrician, therapist. Include MSE notes, treatment plans, medication trials.
5. Therapy records. Speech, occupational, physical, ABA, mental health counseling. Session notes showing functional limitations are exactly what SSA needs.
6. Function reports from caregivers. SSA-3380-BK Function Report for kids 3 to 18, completed by a parent or primary caregiver. Be specific. Cite examples, not generalities.

Common Reasons Child SSI Claims Get Denied

• Income deeming above threshold. The medical case is often strong but parental income makes the child financially ineligible.
• Insufficient functional documentation. Diagnosis present but day-to-day limitations not documented across settings.
• Less-than-marked findings. SSA found impairment but rated all domains less than marked. Hardest pattern to overturn without new evidence.
• Improvement noted in records. Treatment notes saying child is "doing better" or "responding to treatment" can sink a claim even when overall functioning is still severely impaired.
• Failure to attend Consultative Exam (CE). If SSA orders a CE and the child doesn't attend without good cause, the claim can be denied for failure to cooperate. See our CE guide.

The Age 18 Redetermination Cliff

When a child SSI recipient turns 18, SSA conducts an age-18 redetermination under 20 CFR 416.987. The agency re-evaluates using the adult disability standard (the 5-step sequential), not the child standard. Roughly 40 percent of child SSI recipients lose benefits at age 18 because they no longer meet the adult definition of disability.

Plan for this early. By age 16 or 17, start building adult-style evidence: documentation showing inability to perform substantial gainful activity, functional limitations affecting work, and an updated medical record reflecting current condition. See our age-18 redetermination deep-dive.

Practical Filing Tips

The fastest way to file is online at ssa.gov using the Child Disability Report (SSA-3820), which is the digital equivalent of the paper version. Alternatively, parents can call 1-800-772-1213 to start the claim by phone or schedule an in-person interview at a local SSA field office.

Once filed, the case goes to the state DDS for medical determination. DDS may schedule a CE if existing records are insufficient. Processing times for initial child SSI claims average 7 to 9 months in 2026, with state variance from 4 to 12+ months. See our DDS wait times state-by-state.

Frequently Asked Questions