How to Fill Out and Submit VA Form 21-8940: TDIU Sections and Evidence

To fill out VA Form 21-8940, work through its six sections in order: your identifying information, the service-connected disabilities that keep you from working, a detailed five-year employment history with earnings and hours, your education and training, a remarks section for anything that didn’t fit, and your signature. The form is the veteran’s application for Total Disability Individual Unemployability (TDIU), and you can complete it online at VA.gov or print the PDF and mail it in.¹ The VA uses what you write to decide whether your service-connected conditions, taken together, prevent you from holding substantially gainful employment.

Confirm You Meet the Eligibility Thresholds First

Before you fill anything out, check that you clear the rating thresholds in 38 CFR 4.16. You qualify to be considered if you have one service-connected disability rated at 60 percent or higher, or two or more service-connected disabilities combining to at least 70 percent with one of them rated at 40 percent or more.² Meeting the percentages does not by itself get you TDIU. You also have to show that your service-connected conditions make it impossible for you to find or keep substantially gainful work.

Substantially gainful employment means earning above the federal poverty threshold for a single person, which is $15,960 per year for 2026.³ Work below that amount, or work in a protected environment such as a family business or sheltered workshop, counts as marginal employment and does not disqualify you.² Your inability to work has to trace back to your service-connected conditions, not to age or to unrelated medical problems.

If you fall short of the 60/70 rules but your service-connected disabilities cause exceptional interference with employment or frequent hospitalization, your case can be referred to the Director of Compensation Service for an extraschedular determination. That path exists but takes longer and is less common.

File an Intent to File Before You Send the Form

File VA Form 21-0966, Intent to File, before you send the 21-8940 if you have not already. This locks in a potential effective date up to a year earlier than the day the VA receives your completed application, which can mean substantial retroactive benefits if the claim is approved.⁴ You then have one year from the intent date to submit the completed 21-8940. You can file the intent online, by phone, or in person at a VA regional office. If you are filing a brand-new disability compensation claim at the same time, send Form 21-526EZ along with the 21-8940.⁵

Walk Through the Six Sections of Form 21-8940

Blank fields are one of the most common reasons TDIU claims stall. Fill in everything that applies, and use the remarks section rather than leaving gaps.

Section I: Identifying Information

Your name, Social Security number, VA file number, date of birth, mailing address, email, and phone number. Confirm your VA file number matches what appears on prior VA correspondence. If one has never been assigned, leave that field blank and rely on your Social Security number.

Section II: Disabilities and Medical Treatment

Field 8 is the most important field on the form. List each service-connected condition by its diagnosed name — PTSD, lumbar spine strain, tinnitus — rather than vague descriptions like “back problems.” The rest of the section asks whether you have been hospitalized or treated by a doctor in the past 12 months, along with provider names, addresses, and treatment dates.⁶

Section III: Employment History

This section carries most of the evidentiary weight. Three dates matter: when your disability first affected your full-time employment, when you last worked full-time, and when you became too disabled to work. These dates influence your effective date if the claim is approved, so pin them down before you write.

Field 17 asks for the highest amount you ever earned in a single year, the year you earned it, and your occupation then. Field 18 is the five-year employment history covering every job you held during the last five years you worked, including self-employment and reserve or National Guard duty. For each position, provide the employer’s name and address, type of work, weekly hours, dates of employment, time lost to illness, and highest monthly gross earnings.⁶

The remaining fields ask whether you left your last job because of your disability, whether you receive or expect to receive disability retirement or workers’ compensation, and whether you have tried to find work since. If you applied for jobs and were turned down, list those employers and dates. Documented failed job searches support your claim by showing you attempted to work and could not.

Section IV: Education and Training

Check the box for your highest level of education and describe any vocational training, certifications, or specialized skills you had before you became too disabled to work. List any education or training you pursued afterward. The VA uses this to assess whether your background would realistically let you shift to a different type of work despite your disabilities.

Section V: Remarks

Use this space for anything that did not fit elsewhere, including overflow from the employment history in Section III. Describe in your own words how your service-connected conditions interfere with specific work tasks: difficulty standing for extended periods, inability to concentrate, chronic pain that limits lifting, panic attacks triggered by workplace environments. Specific descriptions carry more weight than a general “I can’t work.”

Section VI: Signature

Sign and date the form. There are witness signature fields on the paper version, but witnesses are not required for electronic submissions through VA.gov.

Supporting Documents to Submit With the Form

Adjudicators read the 21-8940 alongside your medical records, employment records, and any other evidence in your file. Strong supporting documents reduce the chances the claim stalls or comes back with a lowball rating.

VA Form 21-4192 From Your Last Employer

Form 21-4192 asks your most recent employer to confirm your employment dates, job duties, hours, and the reason you stopped working. The employer completes it, not you.⁷ It asks directly whether you left due to disability and whether any accommodations were made for your condition. Give your former employer a heads-up before the VA sends the form. Employers who are caught off guard sometimes ignore the request or respond with minimal detail.

A Medical Nexus Letter

A nexus letter is a written opinion from a physician tying your service-connected disabilities to your inability to work. The strongest letters include three things: a statement that the doctor reviewed your medical and service treatment records, a clear medical rationale explaining how your conditions limit your functional capacity, and an opinion using the VA’s “at least as likely as not” language. Specific occupational limitations, like an inability to sit for more than 20 minutes or lift more than 10 pounds, address exactly what the rating adjudicator has to decide.

Lay Statements and Other Evidence

Statements from your spouse, family, friends, or former coworkers describing how your disabilities affect daily functioning are admissible and often fill gaps that medical records miss. If you have a Social Security Administration disability file, request a copy and submit it. The vocational analysis and functional assessments in that file can supply evidence the VA does not otherwise have, and if the SSA concluded you cannot work, the VA has to explain any disagreement.

How to Submit Form 21-8940

Online through VA.gov. This is the fastest way to get a confirmation of receipt.¹
By mail to the Department of Veterans Affairs, Claims Intake Center, PO Box 4444, Janesville, WI 53547-4444.⁸
By fax if you need a faster turnaround than mail but cannot use the online system.

What Happens After You File

The VA sends a notice confirming receipt and begins the review. As of April 2026, the average processing time for disability compensation claims is around 81 days.⁹ TDIU claims can run longer when the VA has to request records from employers or schedule an exam.

Most TDIU applicants are scheduled for a Compensation and Pension exam — a medical evaluation conducted by a VA doctor or a contract examiner assessing the current severity of your service-connected conditions and how they affect work-related functioning.¹⁰ Treat the appointment as mandatory. Missing it can result in a denial. If you have to reschedule, contact the VA as soon as you know.

If the claim is approved, the effective date is usually the day the VA received your claim, or your Intent to File date if you filed one. Veterans who file within one year of separating from active duty may receive an effective date of the day after discharge.⁴ Retroactive benefits are typically paid as a single lump sum via direct deposit within 15 to 30 days of the decision. Confirm your banking information in VA records is current — outdated account details are a common cause of payment delays.

Keeping the Benefit After Approval

Your rating decision letter will indicate whether the VA considers your rating permanent and total. Signs of a permanent rating include the “Permanent and Total” box checked, a statement that no future exams are scheduled, or notification that you qualify for Chapter 35 Dependents’ Educational Assistance or CHAMPVA.

If your TDIU is not marked permanent, the VA can periodically check whether you are working. The VA monitors earnings through Social Security Administration wage data, and if your income looks like it may be above the poverty threshold, you will receive VA Form 21-4140, an employment questionnaire. Return it. Failing to respond can lead to a reduction. Working in a protected environment or earning below the poverty threshold does not automatically end TDIU, but you have to document those circumstances when the VA asks.²

If Your Claim Is Denied

Under the Appeals Modernization Act, you have three lanes for challenging a TDIU denial.

Supplemental Claim (VA Form 20-0995) with new and relevant evidence the VA did not previously consider, such as a new nexus letter, updated medical records, or your SSA disability file. This is the right choice when the original claim needed stronger evidence.¹¹
Higher-Level Review by a more senior adjudicator looking at the same evidence already in your file. No new evidence allowed, so this works best when you believe the law was misapplied or existing evidence was overlooked.¹²
Board Appeal to the Board of Veterans’ Appeals for review by a Veterans Law Judge. You can pick direct review, submit additional evidence, or request a hearing. Timeline goals range from one year for direct review to about two years if a hearing is involved.¹³

Common denial reasons include incomplete forms, a C&P exam that understated the severity of your conditions, and insufficient evidence linking your service-connected disabilities to your inability to work. When the denial cites a C&P exam you believe was inadequate, a private nexus letter directly rebutting that exam’s conclusions, submitted with a supplemental claim, is often the most effective response.

1
Veterans Affairs. VA Form 21-8940 Veteran’s Application for Increased Compensation Based on Unemployability
2
eCFR. 38 CFR 4.16 – Total Disability Ratings for Compensation Based on Unemployability of the Individual
3
Federal Register. Annual Update of the HHS Poverty Guidelines
4
Veterans Affairs. Your Intent To File A VA Claim
5
Department of Veterans Affairs. VA Form 21-526EZ Application for Disability Compensation
6
Department of Veterans Affairs. VA Form 21-8940 – Veteran’s Application for Increased Compensation Based on Unemployability
7
Veterans Affairs. About VA Form 21-4192
8
Veterans Affairs. How To File A VA Disability Claim
9
U.S. Department of Veterans Affairs. VA Announces Major Improvements in Benefits Processing and Delivery
10
Veterans Affairs. VA Claim Exam
11
Veterans Affairs. Supplemental Claims
12
Veterans Affairs. Higher-Level Reviews
13
Veterans Affairs. Board Appeals