What Is APY (Annual Percentage Yield)?

Annual Percentage Yield (APY) Definition

Annual percentage yield (APY) is the real annual rate of return earned on an investment, often a savings account, which accounts for interest rates compounding on a smaller time frame than annually.

Compounding interest on smaller time frames increases the annual interest rate.

For example, an investment compounded monthly with a 12% APR will have a 12.68% APY.

APY Table
APR vs APY Table

The formula for computing the Annual Percentage Yield is:

APY Formula
Formula for APY

APY = 1 plus r divided by n to the power of n, minus 1, where “r”is the stated annual interest rate and “n”is the number of compounding periods each year.

The smaller the time frame interest compounds, the higher the APY will be.

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How Does APY Work?

Interest earned and interest borrowed are calculated the same way, but stated differently whether it is stated from the perspective of an investor or creditor.

APY is the same as the Effective Annual Rate, or EAR, but APY is stated from the investor’s perspective.

The EAR computes the actual interest paid to a creditor after factoring all fees and interest compounding on smaller time frames.

Nominal Interest Rate, APR and APY

Here is how to remember nominal interest rate, APR, and APY:

  • Interest rate is the interest on the principal borrowed (or earned) which does not factor in additional fees, usually stated annually.
  • Annual Percentage Rate (APR) is the interest plus additional fees, stated as a percentage. APR does not factor in rates compounded on smaller time frames.
  • Annual Percentage Rate (APY) factors in additional fees and whether the rate is compounded on a smaller time frame.

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What Is APY (Annual Percentage Yield) FAQs

APY stands for Annual Percentage Yield.
Annual percentage yield (APY) is the real annual rate of return earned on an investment, often a savings account, which accounts for interest rates compounding on a smaller time frame than annually.
Annual Percentage Rate (APY) factors in additional fees and whether the rate is compounded on a smaller time frame.
Interest earned and interest borrowed are calculated the same way, but stated differently whether it is stated from the perspective of an investor or creditor.
APY = 1 plus r divided by n to the power of n, minus 1, where “r” is the stated annual interest rate and “n” is the number of compounding periods each year. The smaller the time frame interest compounds, the higher the APY will be.
True Tamplin, BSc, CEPF®

About the Author
True Tamplin, BSc, CEPF®

True Tamplin is a published author, public speaker, CEO of UpDigital, and founder of Finance Strategists.

True contributes to his own finance dictionary, Finance Strategists, and has spoken to various financial communities such as the CFA Institute, as well as university students like his Alma mater, Biola University, where he received a bachelor of science in business and data analytics.

To learn more about True, visit his personal website, view his author profile on Amazon, his interview on CBS, or check out his speaker profile on the CFA Institute website.