Understanding VA Math: Why 10% + 10% Doesn’t Equal 20%
If you are a veteran with multiple service-connected disabilities, you have probably asked yourself this frustrating question at some point:
“How does 10% plus 10% not equal 20%?”
I remember logging into my VA eBenefits account one day and discovering that I had been awarded a 10% disability rating for migraines connected to my Traumatic Brain Injury (TBI) from my second deployment.
I was excited.
Like many veterans, I immediately started calculating how much additional VA disability back pay I thought I would receive. I added my ratings together using simple math and estimated the VA owed me well over $10,000 in retroactive compensation.
There was only one problem…
I didn’t yet understand “VA Math.”
What Is VA Math?
VA Math is the method the Department of Veterans Affairs uses to combine multiple disability ratings into one overall combined disability rating.
Most veterans assume disability ratings are simply added together.
Unfortunately, that is not how the VA calculates disability compensation.
Instead, the VA uses a Combined Ratings Table that calculates disability percentages based on the idea that each additional disability affects the “remaining healthy portion” of the veteran rather than the whole person.
This is why multiple disability ratings often combine into a lower overall percentage than veterans expect.
Example of VA Disability Math
Let’s use a common example.
A veteran receives the following VA disability ratings:
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PTSD: 30%
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Traumatic Brain Injury (TBI): 20%
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Hearing Loss: 10%
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Knee Pain: 10%
Most people would assume the total disability rating equals:
30% + 20% + 10% + 10% = 70%
But according to VA Math… that answer is incorrect.
How VA Math Actually Works
The VA combines ratings one at a time using its disability rating table.
Step 1:
Combine 30% PTSD with 20% TBI.
Using the VA Combined Ratings Table:
30 combined with 20 = 44%
Step 2:
Take the new combined rating of 44% and combine it with 10% hearing loss.
44 combined with 10 = 50%
Step 3:
Now combine 50% with the final 10% knee pain rating.
50 combined with 10 = 55%
Final Combined VA Disability Rating:
55%
The VA then rounds disability ratings to the nearest 10%.
In this example:
55% rounds up to 60%
So even though simple math suggests the veteran should have a 70% disability rating, VA Math results in a final combined rating of only 60%.
Why Veterans Get Frustrated with VA Math
Many veterans become frustrated when they first learn how the VA combines disability ratings.
The system often feels confusing because:
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Disability percentages are not simply added together
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Combined ratings appear lower than expected
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Veterans may receive less compensation than anticipated
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The calculation system is difficult to understand initially
I personally called the Department of Veterans Affairs customer service line to ask why the VA calculates disability ratings this way.
To his credit, the VA representative tried his best to explain the process.
But at the end of the conversation, it still felt like veterans with multiple disabilities are often penalized by the VA Math system.
Why Understanding VA Math Matters
Learning how VA Math works is extremely important for veterans because it affects:
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Monthly disability compensation
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Back pay calculations
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Combined disability ratings
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Eligibility for additional benefits
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TDIU qualification
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Future claims and appeals
Understanding the VA combined ratings system can help veterans better estimate compensation and avoid confusion during the VA claims process.
Common Disabilities Used in VA Math
VA Math commonly applies to veterans with multiple service-connected conditions such as:
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PTSD
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TBI
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Migraines
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Back injuries
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Knee pain
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Hearing loss
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Anxiety and depression
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Sleep apnea
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Joint conditions
The more disabilities a veteran has, the more complicated the combined rating calculation becomes.
Final Thoughts
VA disability compensation can already feel overwhelming, and understanding VA Math only adds another layer of confusion for many veterans.
While veterans may disagree with the system, understanding how the VA combines disability ratings is critical when filing claims, estimating compensation, and planning appeals.
As veterans, the more educated we become about the VA disability system, the better we can advocate for ourselves and the benefits we earned through our military service and sacrifice.
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