Annual Percentage Yield (APY) is a standardised measure of the effective annual rate of return on a savings or investment product that accounts for the effect of compounding over the course of one year. It expresses the actual annual return earned when interest is compounded at regular intervals during the year — monthly, quarterly, or daily — rather than simply citing the nominal annual interest rate. APY is calculated as: APY = (1 + r/n)^n – 1, where r is the nominal annual interest rate and n is the number of compounding periods per year. A fixed deposit with a 7% nominal rate compounded quarterly has an APY of approximately 7.19% — the investor effectively earns slightly more than the stated rate due to quarterly compounding. In India, the closest equivalent concept is the Effective Annual Rate (EAR) or Annualised Return — used by banks to disclose the effective yield on fixed deposits with non-annual compounding. SEBI and RBI require financial product providers to disclose effective annual returns rather than simply nominal rates to ensure investors can accurately compare different fixed-income products on a like-for-like basis. APY is particularly useful for comparing cumulative fixed deposits and recurring deposits with different compounding frequencies.
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