APR vs APY: What the Difference Really Means for Your Money
APR vs APY explained plainly: APR is the simple annual rate, APY folds in compounding, and which one you see depends on borrowing versus saving.
Two offers land in front of you the same week. A car loan quotes “5.9% APR.” A savings account advertises “5.9% APY.” Same number, two different letters at the end, and they do not mean the same thing. One of them is hiding a little, and the other is showing off. Knowing which is which is most of the battle.
This guide reconciles how U.S. authorities actually define the two terms: the Consumer Financial Protection Bureau’s plain-language pages, plus the two federal rules that decide which letter you see where. We didn’t open an account or run a quote. We’re explaining the mechanism and the rules, working the standard math, and pointing out where everyday usage drifts from the strict definition. Nothing here is advice about which loan or account to pick.
What’s the difference between APR and APY, in one breath?
APR is the simple annual rate with no compounding folded in. APY is the same kind of rate after compounding is baked in, which makes APY the truer picture of a full year. APR and APY both stand for an annual percentage figure, but APR is the annual percentage rate (used for what you pay to borrow) and APY is the annual percentage yield (used for what you earn on deposits).
Here’s the part that trips people up. For the exact same underlying rate, APY is always the bigger number, because it counts the interest that piles on top of interest during the year. APR just states the headline rate and leaves that pile-up out. So when a borrowing product and a saving product both wave “5.9%” at you, they’re using different rulers.
What is APR, and where will you see it?
APR shows up on the borrowing side of your life: credit cards, car loans, mortgages, personal loans, payday loans. The CFPB describes a credit card’s interest rate as a yearly rate “called the annual percentage rate (APR).” On a loan, the CFPB goes further: the APR is “the interest rate plus any additional fees charged by the lender,” which is why a loan’s APR can sit above its plain interest rate even before any compounding enters the picture.
You see APR because the law puts it there. The Truth in Lending Act, implemented through Regulation Z (12 CFR Part 1026), requires creditors to disclose the APR and the finance charge so consumers can compare the cost of credit on consistent terms. That’s the rule doing its job: it forces every lender to quote the same kind of number.
One honest wrinkle the CFPB itself documents: many credit cards actually charge interest that compounds daily. Card issuers compute a “daily periodic rate” by dividing the APR by 360 or 365, then apply it to your balance each day, so interest can compound day over day if you carry a balance. The APR you were quoted does not reflect that compounding. It’s the simple, stated rate. The compounding happens anyway, quietly, in the math behind your statement.
What is APY, and where will you see it?
Flip to the saving side and the letters change. Savings accounts, money market accounts, and certificates of deposit (CDs) advertise an APY. That’s deliberate, and it’s also the law. The Truth in Savings Act, implemented through Regulation DD (12 CFR Part 1030), requires depository institutions to disclose the “annual percentage yield” and the “interest rate,” using exactly those terms, so you can comparison-shop deposit accounts on a level field. Section 1030.4 is specific about the wording.
APY is built to include compounding. Regulation DD’s Appendix A spells it out: the APY “measures the total amount of interest paid on an account based on the interest rate and the frequency of compounding,” expressed as an annualized rate on a 365-day year. A bank that compounds daily and a bank that compounds quarterly can post the same plain interest rate yet different APYs, and the APY is what lets you tell them apart at a glance.
One caution that follows straight from the definition: on a variable-rate account, the rate can move after you open it, and the APY moves with it. The APY you see at sign-up is the picture as of that day, not a promise for the life of the account.
Why does compounding push APY above the stated rate?
Because you start earning (or owing) interest on interest. Once a period’s interest gets added to the balance, the next period’s interest is figured on the larger number. Stated rate stays put; the effective result creeps up.
Work it with a round number. Take a 12% nominal annual rate. If it compounded only once a year, 12% would be the end of the story. Compound it monthly instead, and each month earns 1% (that’s 12% divided by 12) on a balance that keeps growing. Run it across twelve months and you get (1 + 0.01) raised to the 12th power, minus 1. That comes out to about 0.1268, or 12.68%. The stated rate was 12%; the APY is 12.68%. The extra 0.68 percentage point is compounding, and nothing else.
That 12.68% is exactly the figure Regulation DD’s Appendix A formula produces for that case. The gap widens as compounding gets more frequent and as the rate climbs, which is why two accounts with an identical headline rate can still earn different amounts over a year.
Why do lenders advertise APR while banks advertise APY?
Partly the law decides it, and partly the framing happens to flatter whoever is quoting. On a loan, the lower-looking number is the one without compounding folded in, so APR is the more attractive way to state the cost of borrowing. On savings, the higher-looking number is the one with compounding folded in, so APY is the more attractive way to state a return. Each side leads with the figure that puts it in the better light, and federal rules happen to line up with that instinct.
Regulation Z governs the borrowing side and centers on APR. Regulation DD governs the deposit side and centers on APY. So the pattern you notice (borrowing shown as APR, saving shown as APY) is not a coincidence or a marketing choice alone. It’s two different disclosure regimes, each requiring its own headline number. The takeaway isn’t that anyone is lying. It’s that a borrowing rate and a saving rate are quoted by different rules, and you can’t read them as the same kind of figure.
How do you compare two real offers without getting fooled?
Get both numbers onto the same basis before you judge them. If one offer is an APR and the other is an APY, you’re comparing a rate-without-compounding to a rate-with-compounding, and the APY will look bigger purely because of how it’s built, not because that deal is necessarily better.
A few specifics make the comparison honest:
- For deposits, compare APY to APY. Regulation DD forces every bank to post one, so the comparison is already fair. The account with the higher APY pays more over a year, assuming you leave the money in.
- For loans, compare APR to APR, never APR to a plain interest rate. The CFPB is direct about this: compare APRs to APRs, because an APR and an interest rate are not the same number. The APR is meant to fold in certain lender fees, so it’s the closer read on total cost.
- Watch what the APR does and doesn’t include. A loan APR captures certain fees but not every cost of a deal, and the exact inclusions are set by Regulation Z. Read the fee disclosures, don’t assume.
- Check the compounding frequency on savings. Two accounts can share a stated rate and post different APYs because one compounds daily and the other quarterly. The APY already reflects that, which is the whole point of the number.
Same ruler, then the decision. Comparing across rulers is how a worse deal ends up looking like a better one.
| APR (annual percentage rate) | APY (annual percentage yield) | |
|---|---|---|
| What it measures | The cost of borrowing, stated yearly | The return on a deposit, stated yearly |
| Includes compounding? | No (simple annual rate) | Yes (built into the figure) |
| Where it’s quoted | Loans, credit cards, mortgages | Savings accounts, money market accounts, CDs |
| Who must quote it | Lenders, under Truth in Lending (Regulation Z) | Banks and credit unions, under Truth in Savings (Regulation DD) |
| For the same rate, which looks bigger? | Smaller | Larger |
Frequently asked questions
What is the difference between APR and APY?
APR (annual percentage rate) is a simple yearly rate that does not fold in compounding, and you see it on borrowing such as loans and credit cards. APY (annual percentage yield) builds compounding into the figure, and you see it on deposits such as savings accounts and CDs. For the same rate, APY is the larger number.
Is APR or APY higher for the same interest rate?
APY is higher, because it counts interest earned on interest during the year while APR leaves that out. A 12% nominal rate compounded monthly works out to about a 12.68% APY. The gap grows as compounding gets more frequent or the rate climbs, which is the entire reason the two figures differ.
Why do loans use APR and savings accounts use APY?
Federal disclosure rules split it that way. The Truth in Lending Act (Regulation Z, 12 CFR 1026) requires lenders to quote APR, and the Truth in Savings Act (Regulation DD, 12 CFR 1030) requires banks to quote APY. The framings also happen to flatter each side, since borrowing looks cheaper as APR and saving looks richer as APY.
Does a loan APR include fees?
On a loan, the CFPB defines APR as the interest rate plus certain additional fees charged by the lender, which is why a loan's APR can be higher than its plain interest rate. The exact fees folded in are set by Regulation Z. Read the fee disclosures rather than assuming the APR covers every cost of the deal.
Can an APY change after I open an account?
Yes, on a variable-rate account. The APY shown at sign-up reflects the rate as of that day, and if the underlying rate moves, the APY moves with it. A fixed-rate product such as many CDs locks the rate for a set term. Confirm whether any offer is fixed or variable before you compare.
Bottom line
APR and APY are two ways of writing an annual rate, separated by one idea: APY counts compounding, APR doesn’t. That single difference is why APY runs higher for the same rate, why you meet APR when you borrow and APY when you save, and why comparing one against the other tells you almost nothing useful. Put both offers on the same ruler first. For the next building block in this niche, see What Is an HSA and How It Works, the other founding explainer we published this batch.
This is general information, not financial or tax advice. Rates, fees, and the exact terms a disclosure must include can change, so confirm current figures and rules with the primary source (the CFPB and the underlying regulations) and consult a qualified professional about your own situation.
This is a living guide. Definitions and regulatory citations are drawn from CFPB pages and the underlying federal rules as accessed in June 2026; verify current figures with the primary source before acting.