Interest is either the cost of borrowing money or the reward for saving or investing it — depending on which side of the transaction you’re on. For borrowers, interest is a percentage of the amount of ...

Learn the impact of nominal, real, and effective interest rates on investors and borrowers, including inflation's role and the cost of compounding.

The national average checking account interest rate is 0.07% APY as of February 2026, per FDIC data. See how rates compare and where to find a better rate.

Mortgage interest rates are dropping again, but could they fall back to 3%? Here's what to consider this March.