The Buffalo Bills carried over just under $6 million in salary cap space from 2020 according to Field Yates of ESPN. That means their salary cap space will be that much higher than the official league-announced cap number whenever that becomes official. Buffalo’s total of $5,876,959 is 21st in the NFL in terms of carryover.
The Tampa Bay Buccaneers are the only team to carry over negative cap space due to incentives paid out that were Not Likely To Be Earned. They won the Super Bowl so they’re probably okay with it.