How do I add my adult child as a dependent on my VA disability claim if they cannot work due to a disability?

The VA allows a veteran to claim an adult child as a dependent beyond age 18 (or beyond age 23 if still in school) if the child became permanently incapable of self-support before turning 18 due to a mental or physical disability. This is often called "helpless child" status and is governed by 38 CFR 3.356. The key requirement is that the disabling condition existed and rendered the child incapable of self-support before the child's 18th birthday — it is not enough for the condition to have worsened or newly appeared in adulthood. If the condition began before 18 and has continued to prevent the child from supporting themselves through work or completing schooling, they may qualify regardless of current age.

To start this process, the veteran files VA Form 21-674 (Request for Approval of School Attendance) if school-related, but for a permanently incapacitated adult child, the more relevant step is submitting VA Form 21-686c (Declaration of Status of Dependents) along with evidence supporting the claim of permanent incapacity before age 18. Supporting evidence typically includes medical records from childhood and adulthood, school records showing accommodations or inability to complete a GED or diploma, statements from doctors describing the nature and onset of the condition, and a personal statement explaining the child's functional limitations in detail — including why employment and education remain unachievable.

The VA will schedule a Compensation and Pension exam or request a Disability Benefits Questionnaire if needed to assess whether the incapacity meets the standard under 3.356, which looks at the child's ability to support themselves through work, not merely whether they have a diagnosis. Approval results in additional compensation being added to the veteran's monthly award for an additional dependent, and the status can continue indefinitely as long as the incapacity persists, subject to periodic review.

It is important to gather documentation showing the condition's onset before age 18, since claims are often denied when evidence only reflects adult-onset limitations. A veteran in this situation should begin by requesting complete medical and school records from before the child turned 18, then submit VA Form 21-686c with a detailed statement and supporting medical evidence to start the dependency determination process.