The VA does not add ratings. Under 38 CFR § 4.25 it uses “whole person” math: each new rating acts only on the healthy capacity remaining after the previous ratings. 50% + 30% combines to 65%, rounded to 70%. The bilateral factor under § 4.26 adds 10% to paired-extremity disabilities (both arms, both legs) before combining with the rest. The final value is rounded to the nearest 10% only once at the end.
Many veterans are surprised to learn that a 50% rating plus a 30% rating does not equal 80%. The VA uses a method sometimes called “whole-body theory”: each disability reduces remaining healthy capacity — not total capacity. You cannot be more than 100% disabled, and each new rating acts on whatever percentage of your body is still considered healthy.
This formula is codified at 38 CFR § 4.25 and has been used by the VA for decades.
Step 1. Arrange all ratings from highest to lowest.
Step 2. Start with the highest. Remaining healthy = 100% minus highest rating.
Step 3. Apply the next rating to the remaining healthy percentage (not the original 100%).
Step 4. Subtract that result from the remaining healthy percentage.
Step 5. Repeat for each additional rating.
Step 6. Combined rating = 100% minus final remaining healthy, rounded to the nearest 10%.
The 30% rating acts on the remaining 50% of healthy body, not on the full 100%. Combined math yields 65%, rounded up to 70%.
Even with three ratings that sum directly to 100%, the combined value using VA math is 72%, rounded to 70%.
After combining all ratings, round to the nearest 10%. If the combined value ends in 5 or higher, round up; ends in 4 or lower, round down.
65% rounds up to 70%
64% rounds down to 60%
75% rounds up to 80%
74% rounds down to 70%
When a veteran has compensable disabilities affecting both arms, both legs, or paired skeletal muscles, the VA adds an extra 10% to the combined value of those bilateral disabilities before combining with other ratings. The factor exists because bilateral disability creates compounding functional limitation greater than standard math reflects.
Step 1. Combine the bilateral disabilities using the standard combined-ratings formula.
Step 2. Add 10% of that combined value (the bilateral factor itself).
Step 3. Use that adjusted value when combining with other non-bilateral disabilities.
Left knee 20%, right knee 10%, PTSD 50%.
Higher individual ratings matter more. A single 70% contributes more to combined total than three 20% ratings (which combine to ~49%).
Small ratings still help at rounding thresholds. If you're at 64% combined, even a 10% condition could push you to 68% and round to 70%.
Secondary conditions can push you over thresholds. Secondaries are often overlooked but add crucial points.
Bilateral conditions get a boost. If you have paired-limb disabilities, claim both sides — the 10% multiplier under § 4.26 adds real value.
Under 38 CFR § 4.25, the VA uses "whole person" math — each disability acts only on the healthy capacity remaining after the previous disabilities. A 30% rating on top of a 50% rating acts on the remaining 50% of healthy capacity, contributing 15% more impairment, for a combined 65% (rounded to 70%).
Under 38 CFR § 4.26, paired-extremity disabilities (both arms, both legs, paired skeletal muscles) get an additional 10% multiplier applied to that subset before combining with the rest. The factor exists because bilateral disability creates compounding functional limitation greater than standard math reflects.
After the combined value is calculated, it is rounded to the nearest 10%. 65 rounds to 70, 64 rounds to 60. The rounding is the final step, applied only once.
Because of the 10% rounding step. A combined value of 64% rounds down to 60%. Add a 10% rating, the combined goes to 68%, which rounds up to 70% — a full $300+/month jump at 2026 single-vet rates. Small ratings can be highly leveraged near rounding thresholds.
No combined schedular rating can exceed 100%. However, Special Monthly Compensation (SMC) under 38 USC § 1114(k)+ provides additional monthly payments above 100% in specific situations (loss of use, aid and attendance, etc.).