APR vs APY: The Difference, and When Each One Misleads You

Reviewed on July 15, 2026 • Author: Upaman Research Team • Reviewer: Personal Finance Review Desk

APR and APY answer the same question — "what does a year of this rate do?" — with one crucial difference: APY includes compounding, APR doesn't. The gap between them is small on paper and large in practice, and financial institutions consistently quote whichever number flatters the product. Once you can convert between them, that trick stops working on you.

The definitions

  • APR (annual percentage rate) is the simple annualized rate: the periodic rate multiplied by the number of periods. A card charging about 0.0658% per day has a 24% APR. On loans, APR is also the legally standardized disclosure that folds in certain fees — which is why it's the number regulators make lenders show.
  • APY (annual percentage yield) is what you actually earn or pay after interest starts earning interest: APY = (1 + APR ÷ n)ⁿ − 1, where n is how many times per year interest compounds.

The gap in real numbers

  • A savings account at 5% APR compounded monthly yields 5.12% APY. At 6% APR, 6.17% APY.
  • A credit card at 24% APR compounded daily costs 27.1% APY if you carry the balance all year — the compounding you were never shown adds three full points.
  • At low rates the distinction almost vanishes (2% APR monthly = 2.02% APY). The gap grows with the rate and the compounding frequency — which is exactly where it matters.

Why the quoted number is never an accident

  • Savings, CDs, money market: quoted in APY — the bigger, compounding-included number makes the deposit look better. US truth-in-savings rules actually require APY here, which conveniently aligns with marketing.
  • Credit cards, mortgages, auto loans: quoted in APR — the smaller number. For a mortgage paid monthly with no revolving balance the APR is a fair description; for a revolving credit card balance compounding daily, the effective cost is meaningfully higher than the sticker.
  • The comparison rule: never compare an APR against an APY. Convert both to APY (the real annual effect) and compare like with like. Two savings accounts at "5.00%" can differ if one compounds daily and the other quarterly.

Three places this changes a decision

  1. Choosing between CDs: a CD quoting a rate with annual compounding can pay less than one with a slightly lower rate compounding daily. The APY line on the disclosure settles it — insist on it.
  2. Carrying a card balance vs taking a personal loan: a 24% APR card compounding daily effectively costs ~27% a year, so a 22% APR simple-interest personal loan is a bigger improvement than the two-point sticker gap suggests.
  3. Judging "paying off debt vs investing": debt payoff earns you the debt's APY, guaranteed. Compare that — not the APR — against the expected return of investments before deciding where extra cash goes.

Run your numbers

See compounding frequency change real outcomes with the Compound Interest Calculator (it lets you switch daily, monthly, and annual compounding on the same deposit), compare deposit products with the US Savings & CD Calculator, and see what daily compounding does to a carried balance with the Credit Card Payoff Calculator. This is general education, not personalized financial advice.