Form 21-686c · AI drafter + walkthrough
Add dependents — claim every dollar of retro back-pay
At 30% combined or higher, every dependent on your VA record adds to your monthly payment. The 1-year retro back-pay window is the most- missed money in VA benefits — vets routinely lose $5k–$30k by filing late. The drafter below classifies each dependent, computes the retro window per qualifying event date, and lists exactly what documents to attach.
File online if you can.
VA.gov has an online dependents form that auto-pulls your current record. PDF still works if the online system errors out. Direct link: va.gov/view-change-dependents.
Section-by-section walkthrough
Reference for the form itself. Use alongside the drafter above when you’re filling out VA.gov directly.
Who counts as a dependent
Spouse
Legally married, including same-sex. Common-law spouse counts in states that recognize common-law marriage. You attach a marriage certificate.
Child under 18
Biological, adopted, step-, or in your legal custody. Birth certificate or adoption decree.
Child 18-23 in school
Full-time student at an approved school. Form 21-674 (school attendance certification) is required and must be re-submitted each year the child is enrolled.
Child permanently incapacitated before 18
No upper age limit. Medical evidence of disability before the child’s 18th birthday is required. It pays the same as any other child — the benefit is that the dependency never ends, where an ordinary child drops off at 18 (or 23 if still in school).
Dependent parent
Biological or adoptive parent whose income / net-worth falls below the VA’s dependency thresholds. Often missed. Form 21P-509 attaches.
Pitfalls vets hit
You only get the dependent bump at 30% combined or higher
Below 30%, dependents don’t change the monthly payment. The form is still worth filing because if a future condition pushes you over 30%, the dependent record is already on file and the bump is automatic.
Back-pay from marriage / birth date IS available
There are two ways to get back pay, and most people only hear about the first. If you were already rated 30% or higher when you married or your child was born, you can collect back to that date — but only if you file within ONE YEAR of it. The second way is the one people miss: if you were rated 30%+ only recently, you can collect back to the date that rating took effect, as long as you file within one year of being notified of it. So a wedding from years ago does not automatically mean the money is lost. Only when both of those windows have passed does back pay start from the day VA receives the form.
School-age child requires the 21-674 every academic year
The VA does not assume continued enrollment. If you do not re-certify each fall, the dependent payment for that child will stop and you will get a debt letter for any months paid in error.
Stepchild requires proof of physical custody and financial support
A stepchild is not automatically a dependent. The VA wants either a court order or a sworn statement showing the child lives with you and you support them.
What to attach
- • Marriage certificate (for a spouse)
- • Birth certificate (for biological children)
- • Adoption decree (for adopted children)
- • Court order or sworn statement of physical custody (for stepchildren)
- • Form 21-674 (for children 18-23 in school)
- • Form 21P-509 + income/net-worth evidence (for dependent parents)
- • Final divorce decree (if removing a former spouse)
Already rated 30%+ and not sure if dependents are on file? Run the rating estimator — it shows what your monthly payment SHOULD be with dependents added. If your actual deposit is lower, file 21-686c today.
Walkthrough is software guidance. Not legal advice. A free VA-accredited rep can file 21-686c on your behalf at no charge.