APY vs APR: How to Compare Savings Accounts and Loans Honestly

Two accounts both advertise “5%” — one is a savings account, one is a loan — and yet they behave completely differently. That’s because savings products quote APY and loans quote APR. They’re both annualized rates, but they measure different things, and comparing them as if they were the same number is a classic personal-finance mistake. Here’s what each one actually means and how to use them.

The Core Difference

APR (Annual Percentage Rate) is the rate you pay on borrowed money, including most fees, expressed as a yearly rate. APY (Annual Percentage Yield) is the rate you earn on deposited money, including the effect of compounding. In one line: APR tells you the true cost of borrowing; APY tells you the true return on saving.

How APR Works on Loans

When you compare mortgages or personal loans, the APR is the honest number because it folds in origination fees, points, and other upfront costs — not just the interest rate. A loan with a 4.5% rate and $3,000 in fees can have a higher APR than a loan with a 4.75% rate and no fees. One caveat: APR assumes you keep the loan for its full term. If you refinance or pay off early, the upfront fees get spread over fewer months and the true cost changes.

How APY Works on Savings

Banks advertise APY because it reflects compounding. If a high-yield savings account pays a 4.9% nominal rate compounded monthly, the APY works out to about 5.0% — the extra 0.1% is interest earned on your interest. The more frequent the compounding (daily vs. monthly vs. annually), the higher the APY at the same nominal rate. Comparing APYs lets you rank accounts fairly without doing the compounding math yourself.

The Compounding Formula

If you want to see the mechanics: APY = (1 + r/n)ⁿ − 1, where r is the nominal annual rate and n is the number of compounding periods per year. For monthly compounding on a 4.9% rate: (1 + 0.049/12)¹² − 1 ≈ 0.0501, or 5.01% APY.

Side-by-Side Comparison

	APR	APY
Used for	Loans, credit cards, mortgages	Savings accounts, CDs, money market
Includes fees	Yes	No
Includes compounding	No	Yes
Higher number means	More expensive loan	Better savings return
What to compare	Lowest APR wins	Highest APY wins

Watch Out For These Traps

• Teaser rates: A 0% APR card that jumps to 24% after 12 months is still a 0% APR today — read the full terms.
• Nominal vs. effective: A bank quoting “4.9% rate” and “5.01% APY” is describing the same account; don’t treat the gap as a bonus.
• APR on variable loans: An adjustable-rate mortgage’s APR assumes the rate never changes — it will.
• Fee-free doesn’t mean best: A no-fee loan with a high rate can cost more than a fee loan with a low rate. Always compare APR.

See the Math Yourself

Run your own numbers with the free Compound Interest Calculator — enter the rate and compounding frequency and watch the difference between nominal rate and true yield appear before your eyes.