Going from a ninety percent to a one hundred percent VA disability rating is much harder than it sounds.
That’s because the VA disability rating system doesn’t simply add percentages together. Instead, it uses a combined ratings formula that factors in what’s called “remaining efficiency.”
Combined Rating=A+(100−A)×B\text{Combined Rating} = A + (100 - A) \times BCombined Rating=A+(100−A)×B
In simple terms, each new condition is applied to the portion of your body that is still considered “not disabled.”
So if you’re already at ninety percent, there’s only ten percent of your “efficiency” left. That means even a new fifty percent disability might only raise your overall rating by a few points.
Reaching one hundred percent typically requires either extremely high individual ratings, multiple severe conditions, or eligibility for Total Disability based on Individual Unemployability—also known as TDIU.
But there’s also risk involved.
When you file for an increase, the VA may reopen your entire file. That means they can re-evaluate existing conditions—and in some cases, reduce your rating if they believe there’s been improvement.
So while the jump from ninety to one hundred percent can be life-changing, it’s not just about adding more claims—it’s about strategy, medical evidence, and understanding the system.
Before filing, it’s critical to know both the opportunity—and the potential downside.