Your VA disability rating is the single number that decides how much you are paid each month and how much backpay you are owed. But the way VA arrives at that number surprises almost everyone, because it does not simply add your conditions together. Here is how ratings work in plain English.
A VA disability rating is VA's estimate of how much a service-connected condition reduces your ability to work and function, expressed as a percentage from 0 to 100 in steps of 10. A higher percentage means VA considers the condition more severe and pays you more. A 0 percent rating still matters: it establishes that the condition is service-connected, which can open the door to care and to higher ratings later if the condition worsens.
Each condition is rated against criteria in VA's rating schedule, based on the severity documented in your records, not just the diagnosis. Two veterans with the same diagnosis can receive very different ratings depending on how their symptoms and limitations are documented.
If you have one service-connected condition, your rating is simply the percentage VA assigns that condition. The complication comes when you have more than one. Each condition gets its own rating, and VA then merges them into a single combined rating. That combined number, not the individual ratings, is what determines your monthly pay.
This is where most veterans get tripped up, because the combined rating is almost never the sum of the parts.
VA does not add your ratings together. Instead, it uses a combined ratings table built on a simple idea: each new rating only applies to the part of you that is still considered healthy after the previous rating. The logic is that you cannot be more than 100 percent disabled, so each additional condition is measured against what is left.
Here is the method. Start at 100 percent healthy. Apply your largest rating first. Say it is 50 percent: that leaves 50 percent of you healthy. Now apply the next rating, say another 50 percent, but only to that remaining 50 percent. Fifty percent of 50 is 25, so your total disability is 50 plus 25, which is 75. VA then rounds to the nearest 10, giving a combined rating of 80 percent. Two 50s do not make 100, they make 80.
Work from the highest rating down, applying each to the remaining healthy percentage, then round the final figure to the nearest 10. This is why adding a small condition to an already high rating often does not move the combined number at all, and why the order does not change the result but the rounding does. The VA Disability Rating Calculator runs this table for you, and the VA Rating Estimator helps you gauge each individual condition first.
Once VA settles on your combined rating, it maps to a fixed monthly dollar amount set by law and adjusted each year for cost of living (COLA). The amounts are not proportional: the jump from 90 to 100 percent is far larger than the jump from 10 to 20 percent. Because the schedule is not linear, getting from a high rating to the next level up can change your payment substantially. We do not list specific dollar figures here because they change yearly; check the current rates at VA.gov or use the estimator tools.
Once your combined rating reaches 30 percent, VA adds extra compensation for dependents: a spouse, children, and in some cases dependent parents. Below 30 percent, your dependents do not change the payment. This is one reason crossing from 20 to 30 percent can mean more than the rating jump alone suggests, especially for veterans with families. Make sure VA has your current dependents on file so you are paid correctly.
A few special rules can push your compensation beyond what the basic combined rating implies. The bilateral factor applies when you have conditions affecting both arms or both legs (or paired skeletal muscles); VA adds an extra factor before combining, recognizing that losing function on both sides is more limiting. Special Monthly Compensation (SMC) pays above the standard rates for serious losses, such as loss of use of a limb or the need for regular aid and attendance. And Total Disability based on Individual Unemployability (TDIU) can pay you at the 100 percent rate even if your combined rating is below 100, when service-connected conditions prevent you from holding substantially gainful employment. Each of these is its own path with its own evidence requirements.
Your rating does not just set your monthly check, it sets your backpay too. Backpay is the monthly amount for your rating multiplied by the number of months going back to your effective date. A higher rating raises the monthly figure, and an earlier effective date adds more months, so both pull the lump sum upward. If VA grants or increases your rating, the difference owed since your effective date arrives as a single payment. For the full breakdown, see How VA Disability Backpay Works.
Gauge each condition with the free VA Rating Estimator, combine them into your overall percentage with the VA Disability Rating Calculator, and make sure your claim is solid before you file with the Claim Readiness Checker. For the full picture, browse the Ratings & Backpay hub.
Related reading: How to File Your First VA Disability Claim · VA Rating for Sinusitis and Rhinitis.
VetClaimsGuide is a free, veteran built educational resource. It is not a law firm, not VA-accredited representation, and does not file claims or guarantee any rating, payment, or outcome. Figures are estimates based on current VA rates. Confirm everything at VA.gov or with an accredited representative.