Simple Interest

Simple interest is interest calculated only on the initial principal amount. Unlike compound interest, interest earned in one period does not earn additional interest in subsequent periods. Simple interest is commonly used for short-term loans, bonds, and some consumer loans.

The formula is straightforward: Interest equals principal times rate times time. This simplicity makes it easy to calculate and understand. For example, a $20,000 loan at 3% simple interest over 10 years would generate $6,000 in total interest.

While simple interest is less common than compound interest in modern finance, it still appears in certain financial instruments. Most long-term investments and savings accounts use compound interest, which typically yields higher returns. However, simple interest can be favorable for borrowers, as interest costs do not compound over time.