A first claim can go off course when required information, evidence, or follow-up is missing. That doesn't mean the condition isn't real; it means the record may not yet answer what VA must decide.
This is that cheat sheet. I've seen the same mistakes over and over, and every single one is avoidable. If you're about to file your first claim — or you already filed and it didn't go the way you hoped — read this before you do anything else.
Mistake #1: Missing a Potential Effective-Date Window
If you aren't ready to submit a completed application, understanding the Intent to File rules can help you avoid losing a potential effective date.
An Intent to File (VA Form 21-0966) tells VA that you plan to apply for a benefit. It may establish a potential effective date if VA receives your completed application for the same benefit within one year. VA determines the effective date under the rules that apply to your claim.
If you aren't ready to submit the completed application, review the official VA guidance (opens in new tab) or call 1-800-827-1000. Starting some verified online applications creates an Intent to File automatically, so a separate Form 21-0966 isn't always needed.
You have one year
VA must receive the completed application for the same benefit within one year for the Intent to File to remain relevant to the potential effective date. If you use an ITF, keep its confirmation and set a calendar reminder.
Mistake #2: Leaving Relevant Conditions Unexplained
Identify each condition you believe is related to service, describe it accurately, and submit the relevant evidence you have. VA separately decides whether each condition is service connected and, if granted, how it should be evaluated.
Do not assume that a symptom proves a particular diagnosis or that one condition is automatically secondary to another. If you believe a second condition was caused or aggravated by a service-connected condition, explain that relationship and include relevant medical or lay evidence when available.
- List the conditions you believe are related to service and describe each one accurately
- Separate symptoms from diagnoses when you are unsure, and do not guess at a medical connection
- For a secondary claim, identify the service-connected condition you believe caused or aggravated the additional condition
- Use our condition guides to understand common evidence questions, then verify the rules that apply to your claim
You may list multiple issues in one application, but that does not guarantee one exam or one decision. VA may develop or decide issues separately depending on the evidence needed.
Mistake #3: Submitting Without Evidence
VA may obtain some federal records and has a duty to assist, but you should still identify relevant records and submit the evidence in your possession that supports the claim.
The strongest claims have three types of evidence working together:
- Service treatment records — proof it happened during service. If your records are incomplete, that's not a dead end — the VA has a duty to assist (opens in new tab). Check our roadblocks guide for what to do about missing records.
- Current medical evidence — recent doctor visits, diagnoses, and treatment notes showing you still have the condition. A private doctor's opinion works too.
- A medical nexus opinion, when needed — a qualified clinician may explain whether the condition is connected to service and why. VA weighs the reasoning and supporting facts with all other evidence.
Don't know where to start gathering evidence? Our claims process guide walks through it step by step.
Mistake #4: Writing Vague Buddy Statements
A buddy statement (VA Form 21-10210) is a written account from someone with firsthand knowledge of an event, symptoms, or functional effects. VA considers competent lay evidence with the rest of the record, so the writer should be specific and describe only what they personally observed.
Here's the difference between a vague statement and one that gives VA concrete, firsthand details:
- Weak: "He has knee problems from the military."
- Strong: "I served with SSgt Johnson at Camp Lejeune from 2018-2020. During our deployment, I personally witnessed him limping after every ruck march. By month three, he couldn't run the PFT and was put on limited duty. Since leaving the service, I've visited him at home and watched him struggle to walk down stairs. He takes pain medication daily and can't play with his kids the way he wants to."
See the difference? Dates, locations, specific observations, and impact on daily life help VA understand what the writer personally observed. Buddy statements do not have to come from military buddies; a spouse, parent, friend, or coworker may also describe facts they know firsthand.
Mistake #5: Not Preparing for the C&P Exam
VA may request a Compensation & Pension exam when it needs more medical information. The resulting report is one part of the evidence used to decide the claim.
The examiner evaluates rather than treats the claimed condition. Appointment length varies with the information needed. Describe typical symptoms and flare-ups accurately, including their frequency, duration, and functional impact.
- Describe the full range of symptoms, including typical days and flare-ups
- Be specific about how conditions affect daily life: "I can't stand for more than 10 minutes" beats "my back hurts"
- Don't tough it out — this isn't the time for military bearing
- Bring a list of all your symptoms and medications so you don't forget anything under pressure
- If the examiner doesn't ask about something important, bring it up yourself
Read our full C&P exam preparation tips before your appointment. Seriously — this is the one thing you should not wing.
Mistake #6: Not Understanding How VA Math Works
Pop quiz: if you have a 50% rating and a 30% rating, what's your combined rating? If you said 80%, congratulations — you're wrong. And so is almost every veteran who hears about VA math for the first time.
VA combines disability percentages rather than simply adding them. Under the combined-ratings formula, 50% and 30% combine to 65%, which VA rounds to 70% for compensation purposes.
Combined-rating math is useful for understanding a decision, not for targeting a desired percentage. Claim conditions you believe are related to service and can describe accurately. VA may apply the bilateral factor to certain disabilities of paired extremities under its rules.
Use our benefits calculator to estimate how percentages combine, and check the rating levels page for current compensation information. Eligibility for health care, family, housing, state, and other programs has separate rules; a percentage does not automatically unlock every program.
Mistake #7: Giving Up After a Denial
A denial is not necessarily the end of the process. VA provides decision-review options with different evidence rules and deadlines.
You have three options after a denial, and choosing the right one depends on your situation:
- [Supplemental Claim](/forms#supplemental) — You have new and relevant evidence the VA hasn't considered, such as a nexus letter, updated medical records, or buddy statements. You can file at any time, but filing within one year may preserve your effective date through continuous pursuit.
- [Higher-Level Review](/forms#hlr) — You think the VA made a mistake with the evidence they already have. A senior reviewer takes another look. Must file within one year.
- [Board Appeal](/forms#board-appeal) — You want a Veterans Law Judge to review your case. Choose Direct Review, Evidence Submission, or a Hearing based on how you want evidence and testimony handled. Check current VA guidance for filing deadlines and wait times.
Our roadblocks guide breaks down each lane in detail, and the claim flowcharts can help you visualize which path makes sense for you. Don't let a denial letter collect dust — it's a starting point, not a finish line.
Address the denial reason
Appeal outcomes depend on the facts and evidence in each case. Start by understanding why you were denied, then choose the review option that lets you address that specific issue.
The Bottom Line
The VA claims process can be difficult to navigate, which is exactly why this site exists. The goal is to help you understand the process, describe your claim accurately, and verify the rules that apply.
If you're just getting started, our Filing Your First Claim journey walks you through the entire process from start to finish. And if you're not sure whether you even qualify, the eligibility checker takes about two minutes.
“The system is complicated. Your approach doesn't have to be.”