APR vs APY: What's the Difference and Which One Should You Actually Compare?

APR measures borrowing cost before compounding effects

APR stands for annual percentage rate. It is commonly used for loans and credit cards to describe the yearly borrowing cost.

APR is useful because it gives you a standard rate to compare products, but it does not always show the full effect of compounding within the year.

APY includes compounding

APY stands for annual percentage yield. It reflects how much a balance grows over a year when compounding is included.

That makes APY especially useful for savings accounts, CDs, and some investment-like products where interest is added back into the balance during the year.

Why the two numbers can differ

If interest compounds monthly, daily, or on another recurring schedule, APY will usually be higher than the simple stated rate because you earn returns on earlier returns.

On the borrowing side, what matters most to the user is often the real payment schedule and the total cost over time — not just the headline rate alone.

• Same nominal rate + more compounding = higher APY
• Borrowing comparisons often need payment and fee context too

When to compare APR

Use APR when comparing credit cards, auto loans, mortgages, personal loans, and other borrowing products. It gives a clearer view of annual borrowing cost than interest rate alone.

But if fees, teaser periods, or balance transfer offers are involved, APR still may not tell the whole story by itself.

When to compare APY

Use APY when comparing savings products because it captures the effect of compounding and makes offers easier to compare on a like-for-like basis.

For savers, APY is usually the more useful number when the goal is total annual growth.