Michael Benninger is the lead editor of banking at Forbes Advisor, with more than 10 years of experience in the personal finance space. His writing has been published by the Los Angeles Times, ...

Reviewed by Amy Drury What Is Compound Interest? Compound interest is interest that's calculated on both the initial principal of a deposit or loan and on all accumulated interest. It's a tremendous ...

Compound interest can help turbocharge your savings and investments, or it can quickly lead to an unruly balance, keeping you stuck in a cycle of debt. Its magic can help you earn more — or owe more.

On the surface, an interest rate is just a number. How that number applies to debt or equity opens up a world of possibilities. The first consideration is always whether it’s simple interest vs.