APR vs. APY: What's the Difference and Why It Trips People Up

APR and APY are two of the most commonly confused terms in personal finance — understandably, since they’re built from nearly the same letters and often appear in similar contexts. But they answer different questions, and mixing them up can lead to real misunderstandings about what you’re actually earning or paying.

APR: Annual Percentage Rate

APR represents the yearly cost of borrowing money, typically used for loans, credit cards, and mortgages. It’s meant to reflect the interest rate plus certain fees, expressed as a yearly rate — though critically, APR generally does not account for compounding within the year.

APY: Annual Percentage Yield

APY represents the actual amount you’ll earn on a deposit (like a savings account) over a year, including the effect of compounding — interest earned on interest, as covered in more detail in our compound interest guide.

Why the distinction matters

Because APY accounts for compounding and APR doesn’t, a savings account advertising a 5% APY isn’t directly comparable to a loan advertising a 5% APR — they’re measuring different things, even though the numbers look identical.

For a rate that compounds monthly, for example, the APY will always be slightly higher than the equivalent nominal annual rate would suggest, because each month’s interest starts earning its own interest. This is exactly why banks are required to advertise deposit account rates as APY rather than a simple annual rate — it’s the more complete, accurate figure for savers.

A concrete example

Suppose a savings account offers a 5% nominal annual rate, compounded monthly. Because of monthly compounding, the actual APY works out to be slightly above 5% — roughly 5.12%. On $10,000, that’s the difference between an expected $500 and the actual result of just over $512 after one year purely from the compounding effect.

Why lenders use APR instead

For loans, using APR (rather than an APY-style figure) is partly a matter of convention and regulation — it’s the standard figure lenders are required to disclose, meant to give borrowers a way to compare loan costs across lenders on a similar basis. Some loans do compound in ways that make the effective cost slightly different from the stated APR, which is worth being aware of, particularly for revolving credit like credit cards.

How to use this when comparing offers

• Comparing savings accounts or CDs? Compare APY figures directly — that’s exactly what they’re designed for.
• Comparing loans or credit cards? Compare APR figures, but also check for additional fees not captured in the headline rate, and how often interest actually compounds if you’re carrying a balance.
• Don’t assume a lower nominal rate always means a lower cost or higher return — the compounding frequency behind the number can matter more than the headline figure suggests.

The bottom line

APR and APY look almost identical on paper but represent genuinely different calculations — APR for the cost of borrowing, APY for the yield on savings, with APY specifically built to reflect compounding. Knowing which figure you’re looking at, and what it does and doesn’t include, avoids a common source of confusion in comparing financial products.

This is educational content, not a substitute for professional advice suited to your own circumstances — read our full disclaimer.