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Annual Percentage Yield
Annual percentage yield = (1.03)^12 - 1 = .43 = 43%, where 1.03 is 1 plus the monthly interest and 12 is the number of times in a year interest is compounded. It is also known as the annual effective yield.
Annual percentage yield (APY).
Annual percentage yield is the amount you earn on an interest-bearing investment in a year, expressed as a percentage. For example, if you earn $60 on a $1,000 certificate of deposit (CD) between January 1 and December 31, your APY is 6%.
When the APY is the same as the interest rate that is being paid on an investment, you are earning simple interest. But when the APY is higher than the interest rate, the interest is being compounded, which means you are earning interest on your accumulating interest.