How the VA Combined Ratings Formula Works — And Why Your Math Is Probably Wrong

Hello, and welcome back to this week's newsletter. Over the past few weeks we've covered filing timelines, what your rating means, and the evidence that supports a claim. This week we're going into something that confuses almost every veteran who has more than one service-connected condition — the combined ratings formula. If you've ever added up your ratings and wondered why the VA came up with a lower number, this is why.

The Math You're Probably Doing

Most veterans assume the VA adds ratings together. If you have a 50% rating for one condition and a 30% rating for another, you'd expect an 80% combined rating. That's not how it works. The VA uses a formula that consistently produces a lower number than simple addition — and understanding why can save you a lot of frustration.

How the Formula Actually Works

The VA starts with the idea that you begin as a whole person — represented as 100%. Each disability is applied not to that original 100% but to your remaining ability after the previous disability has already been subtracted.

Here's how that plays out with the 50% and 30% example:

Start with 100% — your whole person. Apply the 50% rating first. 50% of 100 is 50. You now have 50% remaining ability. Apply the 30% rating to the remaining 50%. 30% of 50 is 15. Add those together: 50 + 15 = 65%. The VA rounds to the nearest 10%, which means 65% rounds up to 70%.

So instead of 80% you'd receive a 70% combined rating. The more conditions you add, the more this formula compresses the total — because each new condition is applied to an ever-shrinking remaining percentage.

Why Thresholds Matter

Certain rating thresholds unlock benefits that others don't. The difference between 60% and 70% affects dependents' allowances. The difference between 90% and 100% is even more significant — substantially higher monthly compensation plus additional benefits for dependents and potential property tax exemptions depending on your state.

Because of rounding, the combination and order of your ratings can sometimes affect your final number in ways that aren't obvious. Understanding where you land and what the next threshold means for you is one of the most practical things you can do.

The 38 CFR Part 4 Rating Schedule

The VA assigns ratings based on a schedule outlined in federal regulations — 38 CFR Part 4. Each condition has a diagnostic code with specific criteria for each rating level. Understanding where your condition falls on that schedule, and whether your symptoms match the criteria for a higher rating, is worth knowing before you file or appeal.

What This Means for Your Claim

If you have multiple conditions it is worth understanding how your current ratings combine before filing for additional conditions. A new condition rated at 10% added on top of an existing 90% combined rating will result in 91% — which rounds down to 90%, meaning no change in compensation.

This doesn't mean you shouldn't file. A 0% rating still establishes service connection and protects your eligibility for future increases. But understanding the math helps you set realistic expectations and make informed decisions about which conditions to prioritize.

A Tool Worth Knowing About

The VA publishes a combined ratings table that lays out how two ratings combine at every combination. Search "VA combined ratings table" — it's a straightforward reference that removes the guesswork from the calculation entirely.

The Bottom Line

The combined ratings formula is not designed to be punitive — it reflects a specific methodology for measuring overall disability. But it consistently surprises veterans who expect simple addition. Knowing how it works puts you in a better position to understand your rating, anticipate what a new condition will add to your total, and make informed decisions about your claim.

That is what EARNED.vet is here for.

This newsletter is for informational purposes only and does not constitute legal or benefits advice.

— EARNED.vet