VA Claims · 4 min read

How VA Combined Ratings Work — And Why the Math Usually Shortchanges Veterans

Most veterans assume their disability percentages simply add together. The VA’s “whole person” method produces a lower number in almost every case — understanding it is the first step to knowing whether your rating is correct.

The Myth of Simple Addition

Ask most veterans how the VA calculates a combined disability rating and they’ll say the same thing: you add them up. A 50% rating plus a 30% rating equals 80%, right? Wrong. The VA uses a mathematical method called the “whole person” approach, and it almost always produces a combined rating that is meaningfully lower than simple addition would suggest.

This isn’t a bug in the system — it’s the intended design. The theory is that each subsequent disability affects a person who is already diminished by the previous one, so the percentages are applied sequentially to a shrinking remainder rather than stacked on top of each other.

How the Whole Person Method Works

The VA treats a healthy veteran as a whole person, represented as 100%. The first and highest-rated disability is applied to that whole person. Whatever percentage remains becomes the baseline for the next calculation. Each subsequent condition is then rated against the remaining, not the original 100%.

Step by step, the process looks like this:

  • Start with 100% (the whole, healthy person)
  • Apply the highest-rated disability. A 50% rating means 50% of the person is now impaired, leaving 50% of the person intact
  • Apply the next disability to the remaining 50%. A 30% rating against the remaining 50% adds 15% of impairment to the total
  • That produces a combined value of 65%, which then rounds to the nearest 10% — in this case, 70%

Key rule: The VA always applies ratings highest-to-lowest and rounds the final combined value to the nearest 10%. A combined value ending in 5 or higher rounds up; 4 or lower rounds down.

A Real-World Example

Suppose a veteran has three service-connected conditions rated at 70%, 50%, and 30%. Here’s how the math plays out under the whole person method:

  • Start: 100% whole person
  • Apply 70%: 70% impaired, 30% remains
  • Apply 50% to remaining 30%: 50% × 30 = 15% additional impairment. Running total: 85%
  • Apply 30% to remaining 15%: 30% × 15 = 4.5% additional impairment. Running total: 89.5%
  • Round to nearest 10%: 90%

Simple addition of 70 + 50 + 30 would suggest 150% — obviously impossible — but even capping that at 100%, the intuitive expectation of 100% is very different from the 90% the veteran actually receives. With less severe disabilities, the gap between expectation and reality is even larger.

A medical professional examines a patient during a disability evaluation appointment

The Bilateral Factor

One adjustment that works in veterans’ favor is the bilateral factor. If a veteran has service-connected disabilities affecting both arms, both legs, or a paired combination (e.g., one arm and one leg), the VA adds a 10% bonus to the combined value of those bilateral disabilities before applying the whole person method to the rest of the rating. This is an exception worth knowing — it can meaningfully increase a combined rating for veterans with paired extremity conditions.

Why This Matters for Your Claim

Understanding combined ratings is important at two points in the claims process. First, it explains why getting every eligible condition service-connected matters — each additional condition, even a lower-rated one, continues to push the combined rating upward, even if only incrementally. Second, it reveals why the ordering of ratings and the accuracy of each individual percentage affects the outcome. A condition that is underrated pulls down the combined rating more than it might appear to.

The point at which combined ratings are most consequential is at the 100% threshold and at the 70% threshold (which is the minimum for certain TDIU claims). Veterans who are close to either of those figures should pay careful attention to whether each individual condition has been rated accurately.

What to Do If Your Rating Feels Wrong

If your combined rating seems lower than it should be — or if you believe an individual condition was rated below its true severity — you have one year from the rating decision date to appeal without losing your effective date. The Appeals Modernization Act gives you three lanes: a Supplemental Claim with new evidence, a Higher-Level Review by a senior adjudicator, or a direct appeal to the Board of Veterans’ Appeals.

Before choosing a lane, it helps to understand exactly what went wrong in the rating decision. Was the correct diagnostic code applied? Was the severity evaluated under the right criteria? Did the VA miss a condition entirely? The answers determine which appeal path has the best chance of success.