The values of the mid-level, room, and bi-annual exceptions are tied to the salary cap and the percentage that it shifts in a given year. Here’s how that math works:Non-taxpayer mid-level exception: Worth 9.12% of salary cap. Taxpayer mid-level exception: Increases at the same rate as the salary cap. Bi-annual exception: Worth 3.32% of the salary cap. Teams can use the non-taxpayer mid-level exception or the room exception – but not the taxpayer mid-level – to acquire a player via trade or waiver claim.