How the VA Combines Disability Ratings
Why simple addition is wrong — and what it means financially
If you have a 50% rating and a 30% rating, your combined rating is not 80%. It's 65%, which rounds to 70%. Understanding why requires understanding the VA's 'whole person' formula.
The VA views your body as starting at 100% healthy. Each disability is applied to the remaining healthy percentage — not to the original whole. This is codified in 38 CFR § 4.25↗. See the VA Combined Rating calculator to run your own numbers.
Here's the math: Start with your highest rating. If it's 50%, you're now 50% disabled with 50% remaining healthy body. Your next rating (30%) applies to that remaining 50%: 30% of 50% = 15%. Combined: 50% + 15% = 65%.
Why simple addition is wrong — and what it means financially
The VA then rounds to the nearest 10%. The rounding rule: 65% rounds up to 70% (at .5 or above), while 64% would round down to 60%. This rounding is where the money is. The difference between 60% and 70% is $373.43 per month in 2026 — over $4,250 per year, tax-free, for life.
The bilateral factor adds complexity: if you have conditions affecting both arms or both legs (or paired organs), the VA adds 10% to the combined value of those bilateral conditions before combining them with your other ratings.
Order matters mathematically, but the VA always sorts from highest to lowest, which produces the most favorable result. Our calculator handles this automatically.
One critical point most veterans miss: individual ratings below the combined threshold can still push you to the next tier. Three 20% ratings combine to 49%, which rounds to 50% — significantly more compensation than any single 20% rating alone. Always file for every service-connected condition, even 'minor' ones. They add up in ways that simple addition doesn't predict.