TDIU — Total Disability based on Individual Unemployability — pays you at the 100% compensation rate when your service-connected conditions keep you from holding substantially gainful employment, even if your combined rating is below 100%. It's authorized by 38 CFR 4.16, and for a lot of veterans it's the difference between a 70% check and a 100% one.
The rating that doesn't match the reality
I've watched veterans sit at 70% on paper while their service-connected conditions made holding a job impossible. That gap — rated less than 100% but unable to work — is exactly what TDIU exists to close. It's one of the most valuable benefits in the system and one of the most underclaimed, because the number on your decision letter doesn't advertise it.
The mental shift: TDIU isn't about how disabled a chart says you are. It's about whether you can actually earn a living. Those are two different questions, and VA has a rule for when the second one wins.
The two doors into TDIU
There are two ways to qualify:
- Schedular — 38 CFR 4.16(a). You meet rating thresholds: generally one disability rated at least 60%, or two or more disabilities with at least one rated 40%+ and a combined rating of 70%+.
- Extraschedular — 38 CFR 4.16(b). You're below those numbers but your service-connected conditions still prevent substantially gainful work. These claims are referred for special consideration, so the evidence has to carry more weight.
"Substantially gainful" vs. marginal employment
This is where TDIU is won or lost. TDIU asks whether you can hold substantially gainful employment — not whether you do literally zero work. Marginal employment generally doesn't disqualify you: earnings below the federal poverty threshold for one person, or work in a protected/sheltered setting, can still be consistent with TDIU. Steady earnings above that level generally aren't.
What evidence actually moves a TDIU claim
The rating thresholds get you in the door; the evidence wins it. That usually means medical evidence on how your conditions limit you, your work and earnings history, and often a vocational opinion connecting the two. The question VA is answering is narrow and practical: can this veteran, with these service-connected conditions, keep a substantially gainful job?
How to apply for TDIU
You file VA Form 21-8940 (Application for Increased Compensation Based on Unemployability), typically alongside or after the claim for the underlying conditions. VA may also send VA Form 21-4192 to a former employer to confirm your work history. For the underlying mechanics of filing and evidence, see how to file your own claim.
First, gut-check the numbers: screen your ratings against the schedular thresholds in the TDIU Eligibility Checker, and if you're close on the math, the VA Combined Rating Calculator shows where your combined rating actually lands.
Key takeaways
- TDIU pays at the 100% rate below a 100% rating when conditions prevent substantially gainful work (38 CFR 4.16).
- Schedular path: roughly one rating 60%+, or two+ with one 40%+ and combined 70%+.
- Extraschedular path exists for veterans below those thresholds.
- Marginal employment (below the poverty threshold or sheltered work) generally doesn't disqualify you; apply with VA Form 21-8940.
Frequently asked questions
- What is TDIU?
- TDIU — Total Disability based on Individual Unemployability — pays compensation at the 100% rate when your service-connected conditions prevent you from holding substantially gainful employment, even if your combined schedular rating is less than 100%. It's authorized by 38 CFR 4.16.
- What are the rating thresholds for TDIU?
- Under the schedular path in 38 CFR 4.16(a), you generally need one disability rated at least 60%, or two or more disabilities with at least one rated 40% or more and a combined rating of 70% or more. Veterans below those numbers may still qualify under the extraschedular path.
- Can I work and still get TDIU?
- TDIU turns on whether you can hold substantially gainful employment. Marginal employment — generally earnings below the federal poverty threshold, or certain protected or sheltered work — does not by itself disqualify you. Steady earnings above that level generally do.
- How do I apply for TDIU?
- You file VA Form 21-8940 (the Application for Increased Compensation Based on Unemployability), usually alongside or after your underlying claim, and VA may also send VA Form 21-4192 to your former employer. Medical and vocational evidence of why you can't work is key.
Sources
- 38 CFR 4.16 — total disability ratings for compensation based on unemployability: https://www.ecfr.gov/current/title-38/chapter-I/part-4/subpart-A/section-4.16
- VA — Individual Unemployability: https://www.va.gov/disability/eligibility/special-claims/unemployability/
- VA Form 21-8940 — Application for Increased Compensation Based on Unemployability: https://www.va.gov/find-forms/about-form-21-8940/
