Getting a VA disability rating is rarely just about one percentage on one page. A small wording issue, a missed symptom, a misunderstood math rule, or a deadline that slips by can affect monthly compensation for years. That is part of why rating decisions feel so high-stakes: they often are.
For many veterans, the problem is not that the condition is minor. The problem is that the rating process is technical. VA applies detailed regulations, combines percentages in a way that surprises people, and offers different review lanes depending on whether the issue is bad evidence, bad reasoning, or both. The result is that a veteran can lose money every month without realizing the loss started with a fixable rating mistake.
In this post, you’ll learn about seven common rating mistakes that can reduce monthly benefits, why they happen, and what veterans often look at when deciding whether to challenge a decision. If the math itself feels confusing, it may help to start with this overview of how VA percentages and combined ratings really work.
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A VA disability rating does more than label a condition. It affects monthly compensation, can influence eligibility for other benefits, and may shape future claims for increases, secondary conditions, and unemployability. VA’s review system also has deadlines and lane choices that can affect how quickly a correction happens and whether new evidence gets considered. According to VA, veterans who disagree with a benefit decision generally have three review options: a Supplemental Claim, a Higher-Level Review, or a Board Appeal, and Higher-Level Review and Board Appeal deadlines are generally one year from the date on the original decision letter (VA decision review options). VA also notes that an accredited attorney, claims agent, or Veterans Service Organization representative can help with a decision review or appeal (VA decision reviews and appeals).
Appeals are not rare. In FY 2024, the Board of Veterans’ Appeals adjudicated and dispatched 116,192 appeals, according to the Board’s annual report (Board of Veterans’ Appeals annual reports). That number alone gives some context: a large volume of veterans continue contesting benefit decisions every year, often because the first answer did not fully reflect the record.
One of the most common mistakes is assuming VA simply adds percentages together. It doesn’t.
VA uses the “combined ratings table” in 38 C.F.R. § 4.25, which treats each additional disability as affecting the remaining “efficiency” after the prior disability is accounted for. That is why a 50% rating and a 30% rating do not become 80%. Under the regulation’s example, 50 and 30 combine to 65, and then VA rounds to the nearest 10, with final 5s rounded upward, producing 70% (38 C.F.R. § 4.25).
This often creates two separate problems: