APR doesn't apply to savings accounts the way it does to loans
APR — annual percentage rate — is a borrowing cost. It tells you how much interest you'll pay on money you owe over a year. Savings accounts don't work that way. You earn interest on money you deposit, not pay it. The rate that matters for savings is APY (annual percentage yield), which accounts for compounding — the way interest earns interest.
If you see "APR" listed on a savings account, it's either a mistake in the bank's marketing or the account is structured unusually (like a savings account that lets you borrow against your balance). For a standard savings account, APY is the only rate you need to watch.
The confusion happens because both terms use "annual percentage" and both describe yearly rates. But APR assumes simple interest — you pay the same amount each period. APY assumes compounding — interest gets added to your balance and then earns interest itself. That compounding is why APY is always higher than APR when both are calculated on the same balance.
Key Takeaways
- APR is for loans and credit products; APY is for savings accounts and money market accounts.
- APY includes compounding, which means interest earned in one period gets added to your balance and earns interest in the next period.
- A bank's compounding frequency (daily, monthly, quarterly) affects how much total interest you earn, even if the APY is the same.
- You can compare savings accounts fairly only by looking at APY, not APR, and only if the compounding frequency is the same.
Why banks use APY for savings instead of APR
APR was designed for loans because it's simpler to calculate and compare when you're borrowing a fixed amount and paying it down over time. A mortgage APR tells you the true cost of borrowing that money for 30 years. But savings accounts don't work on a fixed schedule — you can deposit and withdraw whenever you want, and the bank doesn't know how long your money will stay.
APY solves this by showing you what you'd earn if you left your money untouched for a full year and the bank compounded interest at its stated frequency. It's a standardized way to compare one savings account to another. If Bank A offers 4.50% APY compounded daily and Bank B offers 4.50% APY compounded monthly, you know Bank A will pay you slightly more because daily compounding happens more often.
The Federal Reserve requires banks to disclose APY (not APR) on savings products so consumers can compare them fairly. This is why you'll never see APR on a savings account statement — it's not the legal disclosure for that product type.
How compounding frequency changes what you actually earn
The APY number assumes a specific compounding schedule. Common frequencies are daily, monthly, and quarterly. Daily compounding is most common for high-yield savings accounts; monthly or quarterly is more common for traditional savings accounts at brick-and-mortar banks.
Here's why it matters: if a bank compounds daily, it adds interest to your balance 365 times a year. If it compounds monthly, only 12 times. With daily compounding, each day's interest gets added to your balance and starts earning interest the next day. With monthly compounding, you wait 30 days before that happens. Over a year, daily compounding produces more total interest.
The APY already accounts for this difference, so you don't have to do the math yourself. A bank that compounds daily will show a higher APY than one that compounds monthly, even if the underlying rate is the same. When you compare two savings accounts, the one with the higher APY will pay you more money, period — as long as you're comparing accounts with the same balance and the same holding period.
What happens to your interest if you withdraw money early
APY assumes you leave your money in the account for a full year. If you withdraw before then, you earn less interest because your balance was lower for part of the year. The bank still calculates interest based on your actual daily balance, so the amount you earn is proportional to how long the money stayed in the account.
Some savings accounts (particularly those marketed as "high-yield") have no withdrawal penalties or minimum balance requirements, so you can take your money out whenever you need it without losing the interest you've already earned. Others, especially older savings accounts at traditional banks, may have restrictions. Check your account agreement to see whether there are any penalties or holds on withdrawals.
The APY is still accurate even if you withdraw early — it just means you won't earn the full amount the APY suggests because your balance was lower. If you deposit $10,000 at 4.50% APY and withdraw it after six months, you'll earn roughly half of what the APY projects, not the full amount.
How to calculate what you'll actually earn
You don't need to calculate it yourself — your bank will show you projected interest in your online account or on statements. But if you want to see the math, the formula is: Final Balance = Starting Balance × (1 + APY) ^ (number of years). For one year, it's simpler: multiply your balance by the APY as a decimal. A $10,000 balance at 4.50% APY earns $450 in one year (before taxes).
If you're comparing accounts, use an online savings calculator and plug in the APY, the compounding frequency, and the amount you plan to deposit. Most banks' websites have these calculators built in. The result will show you the difference between a 4.25% APY account and a 4.50% APY account over the time period you care about — usually one year.
Remember that interest earned on savings is taxable income. The bank will send you a 1099-INT form at the end of the year if you earned $10 or more in interest. You'll owe federal income tax on that amount, and possibly state income tax depending on where you live.
Why APY changes and what to watch for
Banks set their APY based on the Federal Reserve's interest rate, which changes throughout the year. When the Fed raises rates, banks typically raise APY on savings accounts within days or weeks. When the Fed cuts rates, banks often lower APY more slowly — sometimes weeks or months later. This is normal and legal; banks are not required to pass rate changes to savers at the same speed they pass them to borrowers.
High-yield savings accounts (usually online banks) tend to raise and lower APY faster than traditional banks because they compete directly on rate. A traditional bank might offer 0.01% APY while an online bank offers 4.50% APY for the same type of account. The difference is usually because online banks have lower overhead costs and can afford to pay more interest.
Check your account's APY every few months, especially if the Fed has announced rate changes. If your bank's rate has dropped significantly and competitors are offering more, you can move your money to a higher-paying account. There's no penalty for switching savings accounts, and you can open a new one while keeping the old one open.
APR on savings accounts: when it actually appears
You might see "APR" on a savings product if the account includes a borrowing feature — for example, a savings account that lets you take out a loan against your balance, or a hybrid product that combines savings with a line of credit. In those cases, the APR applies only to the borrowed portion, not to the money you've deposited. The savings portion still earns APY.
Some older savings accounts or specialty accounts (like Christmas Club accounts) may also list APR instead of APY due to outdated disclosure practices, but this is rare. If you're unsure whether a rate is APR or APY, ask the bank directly or check the account's disclosure document — it will say "annual percentage rate" or "annual percentage yield" explicitly.
For any standard savings account, money market account, or certificate of deposit (CD), the rate you see will always be APY. That's the legal standard, and it's the only rate you need to compare accounts fairly.
Frequently Asked Questions
Is APY the same as interest rate?
APY and interest rate are related but not identical. The interest rate is the percentage the bank pays on your balance. APY is that rate plus the effect of compounding. If a bank pays 4.50% interest compounded daily, the APY will be slightly higher than 4.50% because of compounding. The APY is what you should use to compare accounts.
Can a savings account have a negative APY?
No. A negative APY would mean the bank charges you to hold your money, which is not how savings accounts work in the United States. Some banks charge monthly maintenance fees, but those are separate from APY. The APY itself is always zero or positive.
What's the difference between APY and APR on a credit card?
APR on a credit card is the cost of borrowing money you owe. APY on a savings account is the earnings on money you've deposited. APR is what you pay; APY is what you earn. They're opposite directions of money flow, which is why they use different calculations and why you'll never see APR on a savings account.
Does the bank compound interest on the interest I've already earned?
Yes. That's what compounding means. Interest gets added to your balance, and then the next compounding period, you earn interest on that interest too. This is why daily compounding produces more total interest than monthly compounding — the interest gets added to your balance more often, so it starts earning interest sooner.
If I move money between savings accounts, do I lose the interest I've earned?
No. Interest you've already earned stays in your account and belongs to you. When you transfer money to a new account, you take that interest with you. You only lose future interest if you move money to an account with a lower APY, because you'll earn less going forward.