Your VA rating - DAV
www.dav.org › va-claims-rating-va-mathThe veteran’s back injury is also rated at 50%, but no longer at 50% of the whole efficient person. Instead, the back injury rating is subtracted from the remaining efficient person. So only 25% (for the back injury) is added to the first 50% (for the TBI). 50% (TBI) + 25% (back injury) = 75% combined disability rating.