Annual Percentage Yield (APY)

What Is Annual Percentage Yield (APY)?

Annual percentage yield, or APY, is the annual rate of return on a deposit account after taking compounding into account. It is the figure consumers often see when comparing savings accounts, high-yield savings accounts, money market deposit accounts, and certificates of deposit. APY helps people compare what a deposit account may actually earn over a year rather than looking only at the stated interest rate.

Key Takeaways

• APY is a deposit-account yield measure that includes compounding.
• It is commonly used for savings accounts and other deposit products.
• APY is different from a simple interest rate because compounding changes the effective annual return.
• Consumers use APY to compare how much different deposit accounts may earn.
• APY is not the same thing as APR, which is a borrowing-cost concept.

How APY Works

A deposit account may credit interest more than once per year. Because interest can then earn interest, the effective annual return becomes higher than the simple nominal interest rate alone would suggest. APY is the standardized figure that captures that effect for annual comparison purposes.

A simplified way to think about the math is:

APY = effective annual yield after compounding

APY is especially useful when consumers are comparing deposit accounts that compound on different schedules.

How APY Improves Yield Comparison

Savers need a clear way to compare returns across deposit products. A bank may advertise an interest rate, but the APY gives a more complete picture of what the money may earn over the course of a year when compounding is included. That makes APY one of the most practical yield terms in everyday personal finance.

It is especially helpful when promotional accounts, CDs, or money market deposit accounts use different compounding schedules. APY gives consumers one standard annual figure instead of forcing them to compare raw rate language that may not be directly comparable.

APY Versus Interest Rate

APY and interest rate are related but not identical. The interest rate is the base rate paid on the deposit. APY reflects the annualized effect of compounding on top of that rate. When compounding is more frequent, APY can be higher than the simple stated rate.

Savers comparing deposit accounts usually care more about APY than about the raw rate alone.

APY Versus APR

APY is also often confused with APR. APY is generally used on the savings side of finance to describe what a deposit account earns. APR is generally used on the borrowing side to describe what a loan or credit product costs. The two measures sound similar, but they answer different consumer questions.

Example of APY

Suppose two savings accounts advertise the same stated interest rate, but one compounds more frequently. The account with more frequent compounding may produce a higher APY. That does not mean the nominal rate changed. It means compounding improved the effective annual yield.

For savers deciding where to park cash, APY is usually the more useful shopping figure.

How APY Standardizes Deposit Yield Comparisons

Consumers often encounter APY when shopping for deposit accounts because it helps standardize comparison shopping. Without APY, it would be harder to compare products that all use slightly different compounding structures or marketing language.

In practice, APY is the number that answers the real consumer question: if this balance stays in the account for a year, what annualized yield does the bank say it should earn?

The Bottom Line

Annual percentage yield is the annual return on a deposit account after compounding is taken into account. It gives savers a standardized way to compare how much deposit products may actually earn over time. The clearest way to think about APY is as the annualized earnings figure that makes deposit-account comparisons more meaningful.