APY (annual percentage yield)
Definition
The effective yearly return on savings once compounding is included. It's the fairest way to compare savings accounts.
Formula
APY = (1 + r/n)^n − 1, where r is the stated annual rate and n the number of compounding periods per year.
Example
A 4.00% rate compounded daily works out to an APY of about 4.08%.
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