VA doesn't add your disability ratings together. It combines them with "whole-person" math — each new rating applies only to the percentage of you that's still considered healthy — then rounds the result to the nearest 10%. That's why a 30% and a 20% rating combine to 44%, which VA rounds down to 40%, not 50%.
Why "VA math" feels like a rip-off
The first time you see three or four ratings on your decision letter and a combined number that's way lower than they add up to, it feels like a con. It isn't — it's just a different kind of math, and once you understand it you stop leaving points on the table. I went from 0 to 100%, and a big part of that was understanding how each condition actually moves the combined number, not just how many I had.
Here's the mindset shift: every rating after your first one is worth less than its face value, because it only acts on what's left. That's not a reason to stop claiming conditions — it's a reason to be strategic about which ones you pursue and to document the higher-percentage ones well.
How the combined-ratings formula actually works
VA uses the combined ratings table in 38 CFR 4.25. The mechanic:
- Start with your highest rating and treat the rest of you as healthy (the "remaining efficiency").
- Apply the next rating to that remaining efficiency, not to the whole 100%.
- Repeat down the list, always working in descending order.
- Round the final result to the nearest 10%.
So with a 30% and a 20%: the 30% leaves you 70% "efficient," the 20% takes 20% of that remaining 70 (which is 14), and 30 + 14 = 44 — rounded to 40%.
The bilateral factor — the bonus most vets miss
If you have disabilities affecting both arms, both legs, or paired skeletal muscles, 38 CFR 4.26 gives you the bilateral factor: VA combines the paired-limb disabilities, adds an extra 10% of that combined value, and only then folds the result into the rest of your ratings. It's small, but on a borderline case it can be the difference between rounding down and rounding up. The catch is that it only applies to genuinely bilateral (paired) conditions — a left knee and a right knee, not a knee and your hearing.
Combined rating vs. monthly pay
Your combined rating maps to a monthly compensation amount, but pay only changes in 10% steps. That's why moving from 44% to 46% can be worth real money (it rounds 40% → 50%) while moving from 50% to 54% changes nothing. The dollar figures themselves change every year with the cost-of-living adjustment, so don't trust a fixed number you read online — check VA's current compensation rates when you need an actual amount.
How to estimate your combined rating
You don't have to do the table math by hand. Enter your conditions and individual ratings in the VA Combined Rating Calculator to see your combined rating, the bilateral factor, and an estimated monthly amount. Then, if you're trying to climb, read how to file your own claim for the evidence side, and if you're stuck below 100% on paper, look at whether TDIU could pay you at the 100% rate.
Key takeaways
- VA combines, it doesn't add — each rating acts only on your "remaining" healthy percentage (38 CFR 4.25).
- The final combined number is rounded to the nearest 10%; 44% rounds down to 40%.
- The bilateral factor (38 CFR 4.26) adds 10% for paired-limb disabilities and can tip a borderline case.
- Pay changes only at each 10% step, and the dollar amounts shift yearly with COLA.
Frequently asked questions
- Why doesn't VA just add my disability ratings together?
- Because VA rates the whole person, and a person can't be more than 100% disabled. Each additional rating applies only to the part of you still considered healthy, so the percentages combine rather than add. Two 50% ratings combine to 75%, not 100%.
- How does VA round my combined rating?
- VA combines your ratings using the table in 38 CFR 4.25, then rounds the final number to the nearest 10%. A combined value of 44% rounds down to 40%, while 45% through 54% rounds to 50%. Only the final figure is rounded, not each step.
- What is the bilateral factor?
- Under 38 CFR 4.26, when you have disabilities affecting both arms, both legs, or paired skeletal muscles, VA adds an extra 10% of the combined value of those paired disabilities before combining with the rest. It can nudge a borderline rating to the next level.
- Does a higher combined rating always mean more money?
- Monthly compensation goes up in 10% steps, so an increase only changes your pay if it moves your rounded rating to the next 10% level. VA publishes a pay table that changes with the annual cost-of-living adjustment, so check the current rate.
Sources
- 38 CFR 4.25 — combined ratings table: https://www.ecfr.gov/current/title-38/chapter-I/part-4/subpart-A/section-4.25
- 38 CFR 4.26 — bilateral factor: https://www.ecfr.gov/current/title-38/chapter-I/part-4/subpart-A/section-4.26
- VA — Disability ratings: https://www.va.gov/disability/about-disability-ratings/
- VA — Current disability compensation rates: https://www.va.gov/disability/compensation-rates/veteran-rates/
