What is VA Form 21-0966?

VA Form 21-0966 is the Intent to File a Claim for Compensation form. Filing it locks the effective date of any claim filed within the next 365 days. The form is one page. It can be submitted online via VA.gov, by phone to 800-827-1000, by mail, or through an accredited Veterans Service Organization. 38 CFR 3.155 is the controlling regulation.

Why does the Intent to File date matter?

Because VA disability benefits are paid retroactively to the effective date of the claim, and the effective date is typically the date VA received the formal claim — unless an Intent to File was filed first, in which case the effective date moves back to the Intent to File date. For a 60% rating at 2026 rates ($1,435.02/month for veteran alone), every month of earlier effective date is roughly $1,400 in back pay. Eight months earlier means roughly $11,167 in back pay. Twelve months means roughly $16,751.

How long does an Intent to File protect me?

365 days from the date VA receives the Intent to File. The formal claim (VA Form 21-526EZ or equivalent) must be received by VA within those 365 days to receive the backdated effective date. If the formal claim arrives on day 366, the protection is lost and the effective date defaults to the date the formal claim was received.

Can I file multiple Intent to Files for different claims?

Yes, but with limits. Each Intent to File covers one benefit type (compensation, pension, or DIC). An Intent to File for compensation covers all conditions a veteran files for in the 365-day window — it is not condition-specific. Filing a new Intent to File for compensation while a prior one is still active starts a new 365-day window but the earlier date is preserved only for claims filed during the original window.

What if I miss the 365-day window?

The Intent to File protection expires. The effective date for any subsequent claim defaults to the date the formal claim is received. Veterans can file a new Intent to File at any time, but the earlier date is lost. The narrow exception: if the veteran can demonstrate a continuous pursuit of the claim through other filings (informal claims, prior denied claims being appealed), the effective date analysis becomes more complex and an accredited representative should review the timeline.

Does an Intent to File work for increased rating claims?

Yes. The Intent to File mechanism applies to original claims, claims for increase, and supplemental claims alike. A veteran rated 30% for PTSD who notices symptoms worsening should file an Intent to File while gathering updated records — the increase, when granted, will be effective from the Intent to File date if the formal increase claim is filed within 365 days.

Can a VSO file an Intent to File on my behalf?

Yes. An accredited Veterans Service Organization representative, accredited attorney, or accredited claims agent can submit VA Form 21-0966 on the veteran's behalf with the veteran's signed authorization (VA Form 21-22 for VSO designation, 21-22a for attorney). VSOs often file Intent to File on the first call before they have even completed the intake — this is the right practice and locks the date while the case is being developed.

Intent to File Strategy: VA Form 21-0966 and the Effective-Date Lock

By Shirley Chia. Published 2026-06-01. Source: 38 CFR 3.155, 38 CFR 3.400.

TL;DR. VA Form 21-0966 (Intent to File) is the effective-date preservation tool. Submitting it locks the effective date of any compensation claim filed within the next 365 days. The form is one page, takes five minutes, and can be filed online via VA.gov, by phone (800-827-1000), by mail, or through a VSO. Veterans should file Intent to File the day they start thinking about a claim — before gathering nexus letters, before scheduling private exams, before reading a single rating-criteria page. At 2026 rates, every month of earlier effective date is worth roughly $1,400/month at 60% and $1,760/month at 70%. Eight months of evidence gathering at 60% = $11,167 in preserved back pay. The Intent to File is the single highest-leverage form in VA claims practice and almost no veteran files it before they need to.

The mechanism: why effective dates drive back pay

VA disability compensation is paid retroactively to the effective date of the claim. When VA grants a claim in November 2026 with an effective date of March 2026, the veteran receives the November 2026 monthly payment going forward AND a lump-sum back-pay check covering March through October 2026. That back-pay check is often the largest single payment a veteran ever receives from VA — for a 60% rating, eight months of back pay is roughly $11,167 in 2026 dollars.

The default effective date under 38 CFR 3.400 is the date VA received the claim or the date entitlement arose, whichever is later. For most veterans, this means the effective date = the date the formal claim (VA Form 21-526EZ) was received.

The Intent to File exception under 38 CFR 3.155 moves the effective date back to the date the Intent to File was received, provided the formal claim is filed within 365 days. This is the single most valuable procedural mechanism in the regulations.

How to file an Intent to File

Online via VA.gov

The fastest path. Veterans log in to VA.gov with their Login.gov or ID.me credentials, navigate to "File a claim for disability compensation," and select "Start your Intent to File." The system generates an electronic VA Form 21-0966 with the veteran's identifying information pre-populated, the veteran confirms benefit type (compensation), and submits. VA generates a confirmation with date-stamp. The Intent to File is effective the date of online submission.

By phone

Call 800-827-1000 (VA Benefits hotline). Tell the representative you want to file an Intent to File for compensation. Provide your name, SSN, address, and the benefit type. The representative completes VA Form 21-0966 on your behalf. The Intent to File is effective the date of the phone call. Get the call reference number in writing (request a confirmation letter or email).

By mail

Download VA Form 21-0966 (still available on VA.gov despite the DBQ pull), complete it, and mail to the VA Evidence Intake Center, PO Box 4444, Janesville WI 53547-4444. Send certified mail with return receipt. The Intent to File is effective the date VA receives the form. Mail is the slowest path and the easiest to mess up — use online or phone when possible.

Through a VSO

Veteran Service Organizations (DAV, VFW, American Legion, others) routinely file Intent to File on behalf of veterans during initial intake. The VSO representative submits VA Form 21-0966 electronically through VA's eBenefits or direct system on the day of intake. This is the most reliable path for veterans who plan to use a VSO for the formal claim anyway.

What an Intent to File covers

One Intent to File for compensation covers ALL conditions the veteran files within the 365-day window. The veteran does not need to list conditions on the Intent to File. The protection applies to any compensation claim filed in the window — whether for one condition or twenty, whether known at the time of filing or discovered later.

This is critical for veterans who file Intent to File expecting to claim one condition (say, sleep apnea) and during the evidence-gathering process discover a related secondary condition (say, GERD secondary to sleep apnea). Both claims, filed within the 365 days, benefit from the original Intent to File date.

What the Intent to File does NOT cover: a different benefit type. An Intent to File for compensation does not preserve effective dates for pension claims or DIC (Dependency and Indemnity Compensation) claims. Veterans seeking multiple benefit types must file a separate Intent to File for each.

The five mistakes that void Intent to File protection

Missing the 365-day deadline. The formal claim (VA Form 21-526EZ) must be received by VA within 365 days. Day 366 voids the protection. Track the deadline; calendar it.
Filing only an "informal claim" instead of a complete formal claim. Since 2015, VA requires the formal VA Form 21-526EZ (or its electronic equivalent on VA.gov) to perfect a claim. A letter saying "I want to file for PTSD" without the formal form does not satisfy the 365-day requirement.
Filing the wrong benefit type. An Intent to File for compensation does not preserve a pension effective date.
Not getting confirmation of receipt. Without proof VA received the Intent to File, the veteran cannot establish the effective date if the form is later lost. Keep the VA.gov confirmation, the phone reference number, or the certified mail receipt.
Assuming a denied prior claim extends the Intent to File. A prior denied claim does not extend or refresh the 365-day window. Each Intent to File runs from its own filing date.

When to file Intent to File

The right answer is "as early as possible, before gathering any evidence." Veterans should file Intent to File the moment they begin thinking about a VA claim. There is no cost. There is no downside. The 365-day window starts running, but 365 days is more than enough time for almost any evidence-gathering process.

Specific high-leverage moments to file Intent to File:

Mid-treatment workup. Veteran is being worked up for a condition (e.g., sleep study scheduled, MRI pending) but does not yet have a diagnosis. File Intent to File now. By the time the diagnosis arrives, the effective date is locked.
Pre-separation transition. Active duty service members in BDD (Benefits Delivery at Discharge) or pre-separation processing should file Intent to File on day one of pre-separation, even before identifying conditions.
After a buddy mentions a presumptive condition. The PACT Act of 2022 added presumptive conditions for veterans exposed to burn pits, Agent Orange, contaminated water at Camp Lejeune, and others. Veterans hearing about a presumption that may apply to them should file Intent to File the same day, then research whether they qualify. See PACT Act 2022 complete conditions list.
Symptom worsening on an existing rating. Veteran rated 30% for PTSD notices symptoms worsening. File Intent to File for the increase claim. Gather updated treatment records, get an updated IMO if appropriate, then file the formal increase claim within 365 days.
Discovery of a secondary condition. Veteran with service-connected primary condition (say, knee) develops a secondary (back, hip, opposite knee from altered gait). File Intent to File. See secondary conditions strategy.

Worked example

Navy veteran, separated 2018, files first-time PTSD and tinnitus claims 2026.

March 1, 2026. Veteran is at a VFW meeting; a fellow veteran mentions that PTSD is "compensable" and the local DAV office helps with claims. Veteran goes home, opens VA.gov, navigates to "File a claim for disability compensation," and submits an Intent to File for compensation. Confirmation timestamp: March 1, 2026. The 365-day window now runs until March 1, 2027.

March 15, 2026. Veteran schedules first appointment with a new private psychiatrist for PTSD evaluation.

April through September 2026. Veteran attends bi-weekly therapy. Psychiatrist documents diagnosis, symptom severity, in-service stressors. Veteran requests an audiogram from local ENT and is diagnosed with bilateral high-frequency hearing loss + tinnitus.

October 2026. Psychiatrist completes a private IMO addressing 38 CFR 4.130 PTSD criteria and nexus to combat deployments. ENT completes nexus letter for tinnitus.

November 1, 2026. Veteran files formal VA Form 21-526EZ for PTSD and tinnitus, with the IMO, audiogram, nexus letter, and three buddy statements attached. Files in Fully Developed Claim mode for faster adjudication. See Fully Developed Claim program.

February 15, 2027. VA grants PTSD at 60% and tinnitus at 10%. Combined rating under 38 CFR 4.25: 64% rounded to 60%. Effective date: March 1, 2026 (the Intent to File date), not November 1, 2026 (the formal claim date).

The back-pay math. At 60% (veteran alone, no dependents), 2026 monthly rate = $1,435.02. From March 1, 2026 to February 28, 2027 = 12 months of back pay at $1,435.02/month = $16,751.16. The veteran also receives the November 2026 rate adjustment if Congress passed COLA mid-year, but assume flat for the example. Lump-sum back pay: approximately $16,751. Going-forward monthly: $1,435.02.

Without the Intent to File. If the veteran had not filed Intent to File on March 1, the effective date would default to November 1, 2026 (formal claim received). Back pay would be 4 months = $5,583.72. Lost protection = $11,167.

Time investment for the Intent to File. Five minutes on VA.gov. The single highest dollar-per-minute action in the entire claims process.

Intent to File and the appeal process

Intent to File is for new claims and increase claims. It is NOT how veterans preserve effective dates in the appeal process. For appeals, veterans use the AMA (Appeals Modernization Act) framework: Supplemental Claim (new evidence), Higher-Level Review (no new evidence, senior reviewer), or Board appeal. Each appeal lane has its own continuity-of-claim rules under 38 CFR 3.2500 series.

Veterans who receive a denial and want to keep the original effective date should file the appropriate appeal within one year of the denial decision. That one-year window is separate from any Intent to File.

Sources cited in this article

VetDisabilityCalc is an independent reference site. We are not VA-accredited and we do not prepare or present VA claims. This guide is reference material and is not legal advice.