BRYME Money · Save and grow
APR versus APY, explained: why the two rates on the same account differ
The one difference between APR and APY, why the gap widens at higher rates, and the reading rule that stops a flattering number costing you money.
Almost every borrowing or saving page shows two numbers that look nearly identical and are not: the APR and the APY. They differ for one reason only — compounding — and knowing which one you are looking at tells you whether a rate is the honest cost of borrowing or the honest return on saving.
What the two letters actually mean
APR (annual percentage rate) is the interest rate for a full year expressed without counting the effect of compounding within the year. On US credit products it is a required disclosure under federal law, and on many loans it also folds in certain fees, which is why a loan's APR can sit slightly above its stated interest rate. The CFPB's consumer guidance on credit cards treats the APR as the headline cost figure for exactly this reason.
APY (annual percentage yield) is the rate after compounding — interest earned on interest within the year. On US deposit accounts, regulations require banks to advertise the APY, because it is the number that matches what your balance actually earns. Investor.gov, run by the SEC, keeps a compound-interest calculator that shows the same money growing to different totals depending on how often it compounds.
Why the same account shows different numbers
Take a card charging 12% APR. Interest is applied monthly, so each month adds 1% — and next month's interest is charged on a balance that already includes last month's interest. Across a year that compounding turns 12% APR into roughly 12.68% APY. The gap is small at low rates and grows at high ones, which is why the difference barely registers on a savings account and matters a great deal on a credit card balance carried for a year.
The reading rule
Compare like with like: APY against APY when choosing a savings account, APR against APR when comparing loans or cards. A bank advertising the APY on a loan, or the APR on a savings account, is quoting the flattering number — the APY is always the higher of the two for the same product, so borrowers should look for it and savers should insist on it. For deposits in the US the APY disclosure is mandatory, so any savings advert that hides it deserves suspicion; the mechanics of how those rates get set are covered in how interest rates work.
The one place where neither number is the story
On credit cards, the APR is not what you pay if you pay in full — the grace period means the effective cost is zero. The APR only becomes your real cost when you carry a balance, and then the daily-interest mechanics matter more than either headline figure. That calculation, and the minimum-payment trap that makes carried balances last years, is walked through in how credit card interest works. If you are comparing places to park cash instead, the APY is the whole argument, and high-yield savings accounts covers what separates a real high-yield offer from marketing.
Sources and further reading
Links were reviewed 2026-09-26. Regulatory permissions, firm status and product terms can change; use the current official register before acting.
General information, not financial advice. Everything on BRYME Money is educational. Trading forex, crypto and derivatives involves substantial risk of loss and is not suitable for everyone. Past performance — including any published research — does not guarantee future results. Never trade money you cannot afford to lose.