Investing Answers Building and Protecting Your Wealth through Education Publisher of The Next Banks That Could Fail
Investing Answers Building and Protecting Your Wealth through Education Publisher of The Next Banks That Could Fail

Simple Interest

What it is:

Simple interest is a basic formula for calculating how much interest to apply to a principal balance. The formula for simple interest is:

Simple Interest = Interest Rate x Principal Balance

How it works (Example):

For example, let’s assume that John Doe puts $1,000 in his savings account. The bank pays 3% per year in interest. Using this information and the formula above, we can calculate how much interest he will earn in a year:

Simple Interest = 0.03 x $1,000 = $30

Why it Matters:

Simple interest is a handy, easy tool for estimating the interest earned or paid on a certain balance in one period. However, it does not take into account the effects of compounding, which is the process of earning interest on principal plus interest that was earned earlier. This means it can dramatically understate the amount of interest earned or paid over time.