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VA disability math isn't math (and it's costing you money)
30% + 20% does not equal 50%. Here's how compound ratings actually work.
If you're rated 30% for one condition and 20% for another, the VA does not say you're 50% disabled. The actual rule is compound, not additive.
Here's the math the VA uses: take your highest rating (30%). The remaining "able body" is 70%. Apply your second rating (20%) to that remaining 70%, which is 14%. Add 14% back to the 30% to get 44%. Round to the nearest 10%, final rating: 40%.
This rounds down more often than it rounds up. It's why veterans who add up their individual ratings expecting 60% sometimes end up at 40% or 50% combined. It's also why a single new claim at the right percentage can push you over a 10% threshold and unlock a meaningful pay increase, while another claim at the wrong percentage adds almost nothing.
Two practical implications:
- Order matters when you're stacking claims. Filing for higher-rated conditions first, then secondaries on top, generally maximizes your combined rating. - There are bilateral factors, separately rated left-and-right injuries (knees, hands, eyes) get a 10% additive bonus to the bilateral combination before the compound math runs.
Tool spotlight: VA combined-rating calculator
The VA combined-rating calculator runs the exact math the VA uses, including bilateral factor handling. Plug in each condition, mark bilateral pairs, see your combined rating and 2026 monthly compensation.
What it shows that the VA's published table doesn't: the marginal value of each potential additional claim. If you're at 70%, a 30% claim might push you to 80%, or it might leave you at 70% depending on your existing ratings. The calculator tells you which before you spend three months building evidence on a condition that won't move the needle.
Reader question
A reader asked: "I'm at 60% combined and my doctor just diagnosed me with sleep apnea. What's that worth?"
Sleep apnea ratings depend on whether you require a CPAP. CPAP-required = 50%. No CPAP but documented apnea events = 30%. Without CPAP and minor symptoms = 0%.
If you get the 50% rating: combined with your existing 60%, the math runs as 60% + 50% of remaining 40% = 60% + 20% = 80%. That's a meaningful jump, at the dependent rate, the pay difference between 60% and 80% is roughly $700-$900 per month. The 50% rating also unlocks new SMC eligibility and Chapter 31 vocational rehab considerations.
The catch: sleep apnea claims are scrutinized hard. You'll need a sleep study (not just a clinical observation), CPAP prescription if the rating depends on it, and ideally a nexus letter linking the apnea to your service or to a service-connected condition (depression, anxiety, and chronic pain are all valid pathways).
Quick hits
- •2026 rates: 100% disabled (no dependents) is now $4,099/month; 100% with spouse is $4,343/month
- •The VA released updated CPAP documentation guidance in February 2026, check current requirements
- •Chapter 35 (Dependents Educational Assistance) eligibility expanded in late 2025, review if you're 100% P&T
- •Use the combined-rating calculator before submitting any new claim