Collectively, Americans have nearly $900 billion dollars in credit card debt, and if you carry a balance, your bill is about to get more expensive, as the Federal Reserve raised its key interest rate for the fifth time this year. Currently, the average interest rate on a new credit card offer is more than 21%, according to LendingTree’s Matt Schulz. “You can expect that average to go up to over 22% in the next couple of months because banks don’t tend to waste a lot of time on raising rates when the Fed does,” Schulz said.