APR vs. APY: What Is the Difference?
Two similar-looking acronyms that mean very different things — and knowing which is which can save or earn you real money.
APR and APY look almost identical, and lenders and banks sometimes rely on the confusion. But they measure different things, and mixing them up can lead you to underestimate what a loan costs or overestimate what a savings account earns. Here is the plain-English difference.
What APR means
APR stands for annual percentage rate. It represents the yearly cost of borrowing money, and on loans it is meant to include not just the interest rate but certain fees as well, giving you a fuller picture of the true cost. Crucially, APR does not account for compounding within the year. You will see APR quoted on credit cards, mortgages, auto loans, and personal loans — anywhere you are the borrower.
What APY means
APY stands for annual percentage yield. It represents how much you actually earn on savings in a year, and unlike APR, it does include the effect of compounding. Because interest earns interest, the APY is always slightly higher than the equivalent simple rate. You will see APY quoted on savings accounts, certificates of deposit, and money market accounts — anywhere you are the saver.
Why compounding creates the gap
Suppose an account pays a 6% nominal annual rate. If interest is added just once a year, you earn exactly 6%. But if it compounds monthly, each month’s interest starts earning its own interest, and by year end you have earned about 6.17% — that is the APY. The more frequently interest compounds, the wider the gap between the stated rate and the APY. This is why comparing two savings accounts by their APY, not their nominal rate, gives you the true comparison.
A practical example
A credit card advertising a 24% APR that compounds daily effectively costs you closer to 27% per year once compounding is included — so as a borrower, the real cost is higher than the APR suggests. On the flip side, a savings account advertising a 4.5% APY already reflects compounding, so that is genuinely what you will earn. The rule of thumb: for borrowing, the compounding works against you; for saving, it works for you.
How to use this knowledge
- When borrowing, compare loans by APR — and remember that with frequent compounding, your effective cost can exceed the stated APR.
- When saving, compare accounts by APY, which already includes compounding, for a true apples-to-apples comparison.
- Watch compounding frequency: daily compounding earns (or costs) a bit more than monthly or annual.
- Do not compare a loan’s APR against a savings account’s APY directly — they are measured differently.
- Read the fine print; a low advertised rate can hide fees that a properly calculated APR would reveal.
The bottom line
APR is the cost of borrowing; APY is the reward for saving, and only APY reflects compounding. Match the right metric to the right side of the transaction and you will never be fooled by a rate that looks better — or worse — than it really is.