Your child has a disability. You've been told to apply for Social Security benefits, but you're not sure whether that means SSI, SSDI, or both. The names sound interchangeable. They're not.

SSI and SSDI are fundamentally different programs with different eligibility rules for children. One is based on your child's disability and your family's financial situation. The other is based on your work history. Your child might qualify for one, both, or neither. The rules change completely when they turn 18.

This article explains how each program works for children specifically, how parental income affects eligibility, and what happens at the age-18 transition.

The Core Difference: Needs-Based vs Work-History-Based

Supplemental Security Income (SSI) is a needs-based program funded by general tax revenue. To qualify, your child must have a disability and your family must meet income and asset limits. Work history doesn't matter.

Social Security Disability Insurance (SSDI) is an insurance program funded by Social Security payroll taxes. Your child doesn't qualify based on their own work history. They qualify as your dependent if you're receiving Social Security retirement or disability benefits, or if you've died while insured. There are no income or asset limits.

The distinction: SSI looks at your family's finances. SSDI looks at your work record.

How Children Qualify for SSI

Three requirements:

1. The child must have a disability

Social Security defines childhood disability as a medically determinable physical or mental impairment that results in marked and severe functional limitations and is expected to last at least 12 months or result in death. This is a stricter standard than the adult disability definition.

2. Your family's income must fall below the limit

This is where it gets complicated. Social Security doesn't just count the child's income. If your child is under 18 and lives with you, the agency "deems" a portion of your income and resources as available to the child.

Here's how parental deeming works:

• Social Security excludes the first $2,000 of parental income per month, plus an additional $400 for each other child in the household
• Half of the remaining income is deemed to the child
• If the deemed income plus the child's own income exceeds the SSI limit of $967/month for 2026, the child doesn't qualify

Example: You're a single parent with one child with a disability. Your gross monthly income is $3,200. Social Security excludes $2,000, leaving $1,200. Half of that ($600) is deemed to your child. If your child has no other income, $600 is below the SSI limit and they qualify for a reduced benefit.

If you have higher income or significant assets exceeding $2,000 for an individual or $3,000 for a couple (excluding your home and one vehicle), your child may not qualify for SSI regardless of the severity of their disability.

3. Your child must meet the resource limit

Resources include cash, bank accounts, stocks, and bonds. The limit is $2,000 for a child. Items that don't count: your home, one vehicle, household goods, and certain disability-related equipment.

How Children Qualify for SSDI as Dependents

Your child can receive SSDI benefits based on your work record in two situations:

1. You're receiving Social Security retirement or disability benefits

If you've retired or qualified for SSDI yourself, your child may receive up to 50% of your full retirement or disability benefit. This is called an auxiliary benefit or child's benefit. Your child must be:

• Under age 18, or
• Age 18-19 and a full-time student through grade 12, or
• Age 18 or older and disabled before age 22

The disability doesn't need to meet the strict SSI childhood standard for children under 18. It's a dependency benefit. Once your child turns 18 and is no longer in school, they'll need to meet the adult disability definition to continue receiving benefits as a disabled adult child (DAC).

2. You've died while insured

If you die, your child may receive up to 75% of your benefit as a survivor benefit. The same age and school enrollment rules apply.

No parental deeming applies to SSDI. Your child's benefit isn't reduced based on household income. If you earn $100,000 a year and you're receiving Social Security retirement, your disabled child still qualifies for their dependent benefit.

The Family Maximum Limit

There's a cap on total family benefits. If multiple family members are receiving benefits on your work record, the total family benefit is limited to 150-180% of your individual benefit, depending on your earnings history.

If the family hits this cap, each dependent's benefit is reduced proportionally. Your own benefit isn't affected.

Healthcare Coverage: Medicaid vs Medicare

The medical coverage your child receives depends on which program they're on.

SSI brings Medicaid immediately

In most states, SSI eligibility automatically qualifies your child for Medicaid. Medicaid covers a comprehensive range of services: doctor visits, hospital stays, prescription drugs, therapy (physical, occupational, speech), durable medical equipment, and long-term care. For children under 21, Medicaid's EPSDT benefit (Early and Periodic Screening, Diagnostic, and Treatment) requires the program to cover any medically necessary service, even if it's not typically covered for adults.

Medicaid has no premiums and minimal copays.

SSDI brings Medicare after 24 months

Children receiving SSDI as dependents are not automatically eligible for Medicare. Medicare eligibility requires the beneficiary themselves to be disabled and receiving SSDI. If your child is receiving SSDI based on your work record but hasn't been determined disabled in their own right, they won't get Medicare.

If your child qualifies as a disabled adult child (age 18 or older, disabled before age 22), they'll be eligible for Medicare 24 months after their SSDI entitlement begins.

Medicare has premiums, deductibles, and copays. It covers fewer long-term care and therapy services than Medicaid.

Can Your Child Receive Both SSI and SSDI?

Yes. If your child is receiving SSDI as a dependent and that benefit is low enough that your family's income still falls below SSI limits after accounting for parental deeming, your child can receive both.

Social Security will reduce the SSI benefit dollar-for-dollar by the amount of the SSDI benefit. But receiving both programs can be valuable because it gives your child access to both Medicare and Medicaid, particularly if they qualify as a disabled adult child.

Approximately 12 million people in the U.S. are dual eligible for both programs. It's not uncommon. It's not fraud. It's how the system is designed.

What Changes at Age 18

Everything.

Parental deeming ends

Once your child turns 18, Social Security no longer counts your income and resources as available to them. Your child's own income and assets are evaluated. If your child was previously ineligible for SSI because your family income was too high, they may now qualify.

The disability standard changes

For SSI, Social Security switches from the childhood disability standard to the adult disability standard. Approximately 55.7% of childhood SSI recipients are initially found ineligible under the adult standard. The adult definition focuses on the ability to work, not functional limitations.

If your child is denied during the age-18 redetermination, they have 60 days to appeal. Many families win on appeal, particularly with medical documentation showing continued impairment.

SSDI dependent benefits may end

If your child was receiving SSDI as a dependent and they're not in school and haven't been determined disabled in their own right, benefits end at 18. To continue receiving SSDI as a disabled adult child, they must meet the adult disability definition and have become disabled before age 22.

New benefits may become available

If you're receiving Social Security retirement or disability and your child turns 18, they may now qualify as a disabled adult child: a benefit they couldn't access as a minor. DAC benefits continue for life as long as the disability persists and they don't marry, with some exceptions for marriage to another disabled adult child.

The age-18 transition is high-stakes. One-third of childhood SSI recipients lose benefits. Others gain eligibility. Social Security is required to review every case. You'll receive notice months in advance. Prepare your medical documentation early.

Benefit Amounts for Children

SSI

The maximum federal SSI benefit for 2026 is $967/month. If your child has other income (including deemed parental income), the benefit is reduced. Some states add a state supplement on top of the federal payment.

SSDI

Your child's dependent benefit is up to 50% of your full retirement or disability benefit, or 75% as a survivor benefit. If your full benefit is $2,000/month, your child could receive up to $1,000/month. The actual amount depends on the family maximum and how many other dependents are receiving benefits on your record.

The average SSDI benefit in 2026 is approximately $1,575/month, meaning the average child's benefit would be around $787/month.

How to Apply

For SSI:

Contact your local Social Security office by phone (1-800-772-1213) or schedule an in-person appointment. SSI applications for children cannot be completed online. You'll need:

• Proof of the child's age (birth certificate)
• Proof of U.S. citizenship or eligible noncitizen status
• Medical records documenting the disability
• Information about household income and resources
• Information about the child's living arrangement

For SSDI:

You can apply online at ssa.gov, by phone, or in person. You'll need:

• The child's Social Security number
• Your work history and Social Security number
• Proof of the child's relationship to you (birth certificate, adoption papers)
• Medical records documenting the child's disability if applying as a disabled adult child

If you're unsure which program your child qualifies for, apply for both. Social Security will evaluate eligibility for both programs based on the information you provide. Applying for both doesn't reduce your chances of approval.

When SSI Makes Sense, When SSDI Makes Sense

Your child likely qualifies for SSI if:

• Your family income is low to moderate
• Your child has limited assets
• Your child meets the childhood disability standard
• You need Medicaid coverage immediately

Your child likely qualifies for SSDI as a dependent if:

• You're receiving Social Security retirement or disability benefits
• You've died while insured for Social Security
• Your child is under 18, or 18-19 and in school, or age 18+ and disabled before age 22
• Household income is not a barrier, as SSDI has no income limits

Your child may qualify for both if:

• They're receiving SSDI as a dependent and that benefit is low
• Your family's income after accounting for parental deeming (if under 18) still falls below SSI limits
• You want access to both Medicare and Medicaid

The Practical Reality

Most families don't choose between SSI and SSDI. They apply for what they qualify for based on work history and financial situation. If you've worked and are receiving Social Security, your child may be eligible for SSDI dependent benefits. If your family's income and assets are modest, your child may be eligible for SSI. If both conditions are met, your child may receive both.

The programs serve different purposes. SSI is a safety net for children in families with limited resources. SSDI provides benefits based on a parent's work history, functioning as family income insurance. Neither is better or worse. They're designed to cover different populations.

Start by gathering your work history, household income records, and your child's medical documentation. If you're unsure where to begin, contact Social Security or a disability advocate. The application process is lengthy and documentation-heavy, but understanding which program your child qualifies for is the first step toward accessing the support your family is entitled to receive.