Two numbers show up on every savings and loan offer: <strong>APR</strong> (Annual Percentage Rate) and <strong>APY</strong> (Annual Percentage Yield). They look alike, but they describe interest from opposite sides. APR is what you pay when you borrow; APY is what you earn when you save. Confusing the two is one of the most common — and most expensive — mistakes in personal finance.

What APR Means

APR is the yearly cost of borrowing expressed as a percentage, before the effect of compounding within the year. You see it on credit cards, personal loans, auto loans, and mortgages. A credit card advertised at 22.99% APR means the stated annual rate is 22.99% — but because card interest is compounded daily, the real cost is higher (see APY below).

What APY Means

APY is the real yearly yield on a deposit account after compounding is included. Thanks to the federal Truth in Savings Act, banks must show APY prominently so you can compare savings products on equal footing. The math is simple: APY = (1 + r/n)^n − 1, where r is the nominal rate and n is how often it compounds per year.

At a 5% nominal rate, monthly compounding produces an APY of about 5.116%, while daily compounding produces about 5.127%. The APY already bakes the frequency in, which is exactly why it is the number you should compare.

Why the Difference Matters

  • •<strong>Savers should compare APY.</strong> It reflects what you actually earn. A 5.10% APY account beats a 5.15% APR account, because the APR figure hides less-frequent compounding.
  • •<strong>Borrowers should compare APR.</strong> It reflects the stated cost before compounding; for loans the lender is required to show the total cost including fees through APR disclosures.
  • •<strong>Credit cards invert the logic.</strong> A 24% APR card compounds daily, so its effective APY is roughly 27%. That gap is the price of carrying a balance.
  • •<strong>Fees can erase a rate advantage.</strong> A higher APY means little if a monthly maintenance fee eats the interest. Always compare what lands in your account after fees.

How to Use APR and APY When Shopping

  1. For savings and CDs, sort by APY, then check FDIC insurance and fees.
  2. For loans and cards, sort by APR, then check whether the rate is fixed or variable.
  3. Match the term. Comparing a 1-year APY to a 5-year APY is not apples-to-apples.
  4. Run your own numbers with our compound interest calculator to see how a rate difference compounds over time.

The bottom line: APR tells you what borrowing costs; APY tells you what saving earns. Always compare the number that points in your favor — APY when you are the saver, APR when you are the borrower.

<strong>Disclaimer:</strong> The content provided on CompoundFig is for educational and informational purposes only and does not constitute financial, tax, legal, or investment advice. All calculations and projections are hypothetical and based on assumed rates of return, which may not reflect actual market conditions. Individual results will vary. Consult a qualified financial professional before making decisions. CompoundFig does not provide personalized financial recommendations.