APY Incorporates Within-Year Compounding
APR and APY describe annual rates differently when interest compounds during the year. For a nominal APR with periodic compounding, APY reflects the effect of earning or charging interest on prior-period interest over a full year.
The conversion assumes the stated compounding convention and no additional fees or changing rates. Regulatory APR disclosures for loans can also include qualifying finance charges, so a deposit-style rate conversion is not a substitute for a lender disclosure.
APR and APY answer slightly different questions. APR states a nominal annual rate, while APY expresses the effect of compounding over a year. That distinction matters most when the same nominal rate compounds at different frequencies. For deposits, APY is often useful when comparing how much a balance would grow under the stated compounding convention. For borrowing, fees and lender APR rules can introduce additional costs that a pure rate-conversion formula does not include.
Frequently Asked Questions
Why is APY higher than APR when the rate is positive and compounds more than once a year?
Because APY includes the effect of within-year compounding, while the nominal APR does not.
Does this include loan fees in APR?
No. It converts rates mathematically; regulated credit APR can include qualifying finance charges beyond periodic interest.
Can I compare a loan APR directly with a savings APY?
Not as if they were the same measure. APY includes compounding of the stated rate, while a regulated loan APR can also reflect certain finance charges and follows lending-specific disclosure rules.
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