TDIU — Total Disability Based on Individual Unemployability
Total disability based on individual unemployability, usually called TDIU or IU, lets VA pay compensation at the 100 percent rate when service-connected disabilities keep you from working, even though your combined rating is below 100 percent. The rules are in 38 CFR 4.16 and 4.18. This guide covers the thresholds, which disabilities count together, what "substantially gainful" means, the route for veterans who miss the thresholds, and how to apply.
The rules below come from 38 CFR 4.16 and 4.18 as published on eCFR (current through October 26, 2026), and from VA's Individual Unemployability page on VA.gov, both read on October 28, 2026.
The core question
Section 4.16(a) allows a total rating "where the schedular rating is less than total, when the disabled person is, in the judgment of the rating agency, unable to secure or follow a substantially gainful occupation as a result of service-connected disabilities." Everything else in the regulation either sets the thresholds or explains how to judge that question.
VA.gov adds that TDIU changes the amount you are paid but not your disability rating itself, which stays the same.
The schedular thresholds (38 CFR 4.16(a))
| Your service-connected disabilities | What 4.16(a) requires |
|---|---|
| One disability | Rated at 60 percent or more |
| Two or more disabilities | At least one rated at 40 percent or more, and enough additional disability to bring the combined rating to 70 percent or more |
Disabilities that count as one
For the single 60 percent disability, or the one 40 percent disability in a combination, 4.16(a) treats these as one disability:
| Treated as one disability | What 4.16(a) adds |
|---|---|
| Disabilities of one or both upper extremities, or of one or both lower extremities | Including the bilateral factor, if it applies |
| Disabilities resulting from a common etiology or a single accident | None |
| Disabilities affecting a single body system | Its examples: orthopedic, digestive, respiratory, cardiovascular-renal, neuropsychiatric |
| Multiple injuries incurred in action | None |
| Multiple disabilities incurred as a prisoner of war | None |
So a veteran rated 30 percent for one knee and 20 percent for the other may have the two treated as one lower-extremity disability when deciding whether the 40 percent piece of the test is met.
What does not count against you
Where the percentages are met and the rating agency finds the service-connected disabilities make you unemployable, the existence or degree of nonservice-connected disabilities, and your previous unemployability status, are disregarded (4.16(a)).
Substantially gainful, and marginal employment
Marginal employment is not substantially gainful employment. Section 4.16(a) says marginal employment generally exists when your earned annual income does not exceed the Census Bureau's poverty threshold for one person. It may also be found on the facts when income is higher, for example in a protected environment such as a family business or a sheltered workshop. In every claim VA is to consider the nature of the employment and the reason it ended.
Section 4.18 adds that you may be considered unemployable when employment that was given because of your disability, or in which special consideration was given because of it, ends and you cannot get further work. For amputations, the after-effects of fractures and other injuries of a static character, continuous unemployability from the date of injury or the date the condition stabilized is generally required. But if work since then was only occasional, intermittent, a tryout or unsuccessful, or ended because of the disability, present unemployability may still be attributed to it.
If you miss the thresholds (38 CFR 4.16(b))
VA's stated policy in 4.16(b) is that "all veterans who are unable to secure and follow a substantially gainful occupation by reason of service-connected disabilities shall be rated totally disabled." Rating boards should send cases of veterans who are unemployable because of service-connected disabilities but who do not meet the 4.16(a) percentages to the Director, Compensation Service, for extra-schedular consideration. The referral includes a full statement of your service-connected disabilities, employment history, educational and vocational attainment, and anything else bearing on the issue. VA.gov describes the same route: in certain cases, such as frequent hospitalization, you may qualify at a lower rating.
How to apply
VA.gov lists two forms: VA Form 21-8940, the Veteran's Application for Increased Compensation Based on Unemployability, and VA Form 21-4192, the Request for Employment Information in Connection with Claim for Disability Benefits. You need a service-connected disability first; if you have not filed a compensation claim, that comes first. VA.gov also notes that VA may later ask you to verify your employment status on VA Form 21-4140.
Evidence that tends to matter is evidence on the regulation's own questions: why your last job ended, what your disabilities stop you from doing, your education and work history, and what you earn now, if anything. Statements from former employers, treating-provider opinions about functional limits, vocational assessments and your own detailed statement all speak to them.
For a deeper walk through eligibility and strategy, read TDIU: How to Get 100% VA Pay Without a 100% Rating. If a single disability is exceptional in a way the schedule cannot rate, the separate route is an extra-schedular rating.
Note: This article references sections of the VA's M21-1 Adjudication Procedures Manual. The VA periodically reorganizes the M21-1 and section numbers may have changed since this article was written. For the most current section references, visit the VA's public M21-1 Web Automated Reference Material System (WARMS).
Frequently Asked Questions
Does TDIU change my disability rating?
VA.gov says no: with Individual Unemployability your monthly payment changes to the 100 percent rate, but your disability rating stays the same.
Can I work at all and still get TDIU?
Marginal employment does not count as substantially gainful employment (38 CFR 4.16(a)). It generally exists when your earned annual income does not exceed the Census Bureau poverty threshold for one person, and it may also be found on the facts above that level, for example in a family business or sheltered workshop.
What if my ratings do not meet the 60 percent or 40/70 percent thresholds?
Under 38 CFR 4.16(b), rating boards should submit cases of veterans unemployable because of service-connected disabilities who miss the percentages to the Director, Compensation Service, for extra-schedular consideration.
Do my nonservice-connected conditions count against me?
Where the percentages are met and the rating agency finds your service-connected disabilities make you unemployable, the existence or degree of nonservice-connected disabilities is disregarded (38 CFR 4.16(a)).
Which forms do I file?
VA.gov lists VA Form 21-8940 (Veteran's Application for Increased Compensation Based on Unemployability) and VA Form 21-4192 (Request for Employment Information in Connection with Claim for Disability Benefits).