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Annual Percentage Yield - APY

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Dictionary Says

Definition of 'Annual Percentage Yield - APY'

The effective annual rate of return taking into account the effect of compounding interest. APY is calculated by:

Annual Percentage Yield (APY)


The resultant percentage number assumes that funds will remain in the investment vehicle for a full 365 days.
Investopedia Says

Investopedia explains 'Annual Percentage Yield - APY'

The APY is similar in nature to the annual percentage rate. Its usefulness lies in its ability to standardize varying interest-rate agreements into an annualized percentage number.

For example, suppose you are considering whether to invest in a one-year zero-coupon bond that pays 6% upon maturity or a high-yield money market account that pays 0.5% per month with monthly compounding.

At first glance, the yields appear equal because 12 months multiplied by 0.5% equals 6%. However, when the effects of compounding are included by calculating the APY, we find that the second investment actually yields 6.17%, as 1.005^12-1 = 0.0617.

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