APR and savings accounts are not the same thing

Most savings accounts do not have an APR. They have an APY — Annual Percentage Yield — which is what your bank advertises and what you actually earn. APR is the rate before compounding; APY is the rate after compounding happens. Since savings accounts compound interest (meaning you earn interest on your interest), the APY is always higher than the APR, and APY is the only number that matters for what you will actually receive.

If you see an APR listed for a savings account, it is usually a mistake or a marketing term the bank is using loosely. The Federal Reserve requires banks to disclose APY, not APR, so that is the figure you should compare between banks and use to calculate your actual earnings.

The only time you might encounter APR on a savings product is if you are looking at a certificate of deposit (CD) that compounds annually — in that case, the APR and APY are the same number. For all other savings accounts, monthly or daily compounding means APY is what you need.

Key Takeaways

  • Savings accounts use APY, not APR, because interest compounds throughout the year and APY reflects your actual earnings.
  • APY is always higher than APR on the same account because compounding adds extra earnings on top of the base rate.
  • To calculate what you will earn, multiply your account balance by the APY and divide by 12 for a monthly estimate.
  • Banks must disclose APY in writing, so compare the APY figure between banks rather than trying to calculate APR yourself.
  • If a savings product lists only APR, ask the bank for the APY or move to a bank that discloses it clearly.

Why banks use APY instead of APR for savings

APR assumes interest is paid once per year with no compounding. APY accounts for the fact that interest is usually paid monthly or daily, and each payment gets added to your balance so the next payment is calculated on a larger amount. That snowball effect is compounding, and it is why your actual earnings are higher than the base rate alone.

For example, if you have $10,000 in an account with a 4.00% APR that compounds monthly, you do not earn exactly $400 per year. You earn slightly more because each month's interest gets added to the balance before the next month's interest is calculated. The APY on that account would be around 4.08%, and that 4.08% is what you will actually earn.

The Federal Reserve requires banks to show you the APY in the Regulation E disclosure they provide when you open an account. This is the number you should use to compare savings accounts and to estimate your earnings. If a bank only shows APR, that bank is not following disclosure rules, and you should ask for the APY in writing before opening an account.

How to calculate your actual earnings from APY

You do not need to calculate APR from APY or vice versa. Instead, use the APY your bank gives you to figure out how much money you will actually earn.

The simplest method is the monthly estimate: multiply your balance by the APY, then divide by 12. If you have $10,000 and the APY is 4.08%, you earn roughly $34 per month ($10,000 × 0.0408 ÷ 12 = $34). This is an approximation because your balance changes as interest is added, but it gives you a realistic picture of what to expect.

For a more precise calculation over a full year, use this formula: Final Balance = Starting Balance × (1 + APY)^(1). If you start with $10,000 at 4.08% APY and make no deposits or withdrawals, you will have $10,408 after one year. The difference ($408) is your earnings.

If you want to know earnings for a partial year — say, six months — use: Final Balance = Starting Balance × (1 + APY)^(0.5). The exponent changes based on the fraction of the year. Most banks show you projected earnings in their account details online, so you can also just check there instead of doing the math yourself.

What happens when interest compounds daily versus monthly

The more often interest compounds, the higher your APY will be compared to the APR. A bank that compounds daily will show a slightly higher APY than one that compounds monthly, even if both have the same base rate.

For example, two banks might both offer a 4.00% APR. Bank A compounds monthly and shows an APY of 4.074%. Bank B compounds daily and shows an APY of 4.081%. The difference is small, but over years and larger balances, it adds up. This is why you should compare APY between banks, not APR — the compounding frequency is already baked into the APY number.

Your bank will tell you the compounding frequency in the account terms or the disclosure document. You do not need to recalculate anything; the APY they show you already reflects how often interest is compounded. Just use that APY number to compare accounts and estimate earnings.

Where to find the APY your bank is actually offering

The APY must appear in writing in your account disclosure, which banks provide before you open an account or when you request it. This document is usually called the Truth in Savings disclosure or the account terms and conditions. It will list the APY, the compounding frequency, and any conditions that affect the rate (such as minimum balance requirements).

Online banks typically show the current APY on their website, often prominently on the savings account product page. Traditional banks may require you to call or visit a branch to see the rate. If a bank will not show you the APY in writing before you open an account, that is a red flag — you should move to a bank that discloses it clearly.

The APY can change at any time after you open the account, so check your bank's website or your monthly statement periodically to see if the rate has moved. Banks must notify you of rate changes, but the notification may come by email or mail, so it is easy to miss.

The difference between APR and APY in other financial products

Credit cards and loans use APR because interest does not compound in the same way. On a credit card, you pay interest on the balance you owe, and once you pay it off, you stop owing interest. On a loan, you pay a fixed amount each month, and the interest is calculated on the remaining balance. Neither of these products benefits from compounding the way a savings account does.

If you are comparing a savings account to a CD or money market account, check whether the product uses APY or APR. Most savings products use APY. CDs almost always use APY. If you see APR on a savings or CD product, ask the bank what the APY is, because that is the rate that matters for your earnings.

Frequently Asked Questions

Can I convert APR to APY myself?

Yes, but there is no reason to. Your bank must show you the APY, so use that number instead. If you want the formula anyway: APY = (1 + APR/n)^n − 1, where n is the number of compounding periods per year (12 for monthly, 365 for daily). But again, your bank already did this math for you.

Why is my savings account APY lower than the rate I saw advertised?

Banks often advertise a promotional rate that applies only to new money or for a limited time. Once the promotion ends, your rate drops to the standard APY. Check your account disclosure or call the bank to confirm what rate applies to your balance right now.

Does a higher APY mean I should move my money?

A higher APY is better, but consider the full picture: minimum balance requirements, fees, whether the bank is FDIC-insured, and how easy it is to access your money. A 0.5% higher APY on $10,000 earns you $50 more per year — worth it if the account has no fees, but not if you pay $100 in monthly fees to keep the minimum balance.

What if my bank shows APR but not APY?

Ask the bank for the APY in writing. If they cannot or will not provide it, that is a violation of federal disclosure rules. You can file a complaint with the Consumer Financial Protection Bureau or switch to a bank that discloses APY clearly.

Does APY change if I add money to my savings account?

No. The APY is the rate the bank pays; it does not change based on how much you deposit. Your earnings will be higher because you have a larger balance, but the APY itself stays the same until the bank changes it.