APY is the yearly interest rate your bank pays you, shown as a percentage of your balance

APY stands for Annual Percentage Yield. It is the amount of interest a bank will pay you over one year, expressed as a percentage of the money you have in the account. If your savings account has an APY of 4.50% and you keep $1,000 in it for a full year with no deposits or withdrawals, you will earn $45 in interest.

APY includes the effect of compounding—the way interest gets added to your balance, and then you earn interest on that interest too. Most savings accounts compound interest daily, which means the bank calculates and adds interest to your account every single day. This happens automatically; you do not have to do anything. Because of daily compounding, the actual interest you earn is slightly higher than if the bank just calculated it once at the end of the year.

Banks are required by law to show you the APY before you open an account. You will see it listed on the account details page, in the account agreement, and on any promotional materials. The APY can change at any time after you open the account, especially if the Federal Reserve changes interest rates. Your bank will notify you before making a change.

Key Takeaways

  • APY is the percentage of interest your bank pays you each year, and it already includes the effect of daily compounding.
  • A higher APY means more money in your pocket over time, so comparing APY across banks before opening an account matters.
  • APY can change after you open an account, and banks must notify you before lowering the rate.
  • The actual dollars you earn depend on both the APY and how much money sits in your account for how long.

How compounding makes your interest grow faster

Compounding is the reason APY is higher than a simple interest rate. Here is how it works: on day one, the bank calculates interest on your $1,000 balance. That interest—maybe $0.12—gets added to your account. On day two, the bank calculates interest not just on the original $1,000, but on $1,000.12. The interest compounds every day for the entire year.

By the end of the year, you have earned more interest than you would have if the bank calculated it only once. The difference is small on a savings account, but it adds up. A 4.50% APY with daily compounding will earn you slightly more than 4.50% simple interest would. That is why banks show you APY instead of a basic interest rate—it is the honest number that reflects what you will actually earn.

APY varies widely between banks and account types

Different banks offer different APYs on the same type of account. A traditional bank might offer 0.01% APY on a regular savings account, while an online bank might offer 4.50% or higher on the same account. The difference is real money. On a $10,000 balance, 0.01% earns you $1 per year, while 4.50% earns you $450 per year.

Online banks typically offer higher APYs because they have lower overhead costs than brick-and-mortar banks. Money market accounts and certificates of deposit (CDs) often pay higher APYs than regular savings accounts at the same bank. A CD locks your money away for a set period—three months, one year, five years—and in exchange, the bank pays you a higher rate. If you withdraw the money early, you pay a penalty.

The Federal Reserve's interest rate decisions affect what banks pay. When the Fed raises rates, banks gradually raise the APY they offer on savings accounts. When the Fed lowers rates, banks lower APYs too. This happens with a lag; banks do not always move at the same speed.

What APY means for your actual earnings

The dollars you earn depend on three things: the APY, your account balance, and how long the money stays in the account. If you have $5,000 in an account with 4.50% APY and you leave it untouched for one year, you will earn about $225. If you have $10,000 in the same account for the same time, you will earn about $450. If you withdraw half the money after six months, you will earn less because the average balance was lower.

Banks calculate interest based on your daily balance. If you deposit $1,000 on the first day of the month and withdraw it on the last day, you earn interest only on the days the money was actually in the account. This is why timing matters if you are moving money between accounts.

How to compare APY across banks

When you are shopping for a savings account, always compare the APY, not just the bank name or how convenient the branch is. Write down the APY for each account you are considering, along with any fees that might reduce your earnings. Some banks charge monthly maintenance fees or require a minimum balance to earn the advertised APY.

Check the APY on the bank's website or call and ask directly. The APY should be clearly displayed before you open an account. If a bank is vague about the rate or will not tell you until after you sign up, that is a red flag. Reputable banks post their rates openly.

Remember that APY can change. A bank offering 4.50% today might drop to 3.00% in six months if the Fed lowers rates. This is normal and legal. You are not locked into a rate unless you open a CD, which guarantees the rate for the full term.

The difference between APY and APR

APY and APR (Annual Percentage Rate) sound similar but mean different things. APY is what banks pay you on savings. APR is what you pay to borrow money—like on a credit card or loan. APY includes compounding; APR does not. This is why you will see APY on savings accounts and APR on credit cards and loans.

When you are comparing savings accounts, always look for APY. When you are comparing loans or credit cards, look for APR. Using the wrong number will give you a false picture of what you will actually earn or pay.

When APY changes and what you should do

Banks can change the APY on your savings account at any time after you open it. They must notify you before lowering the rate, usually by email or mail. If your bank lowers the APY and you are unhappy with the new rate, you can move your money to a different bank. There is no penalty for switching banks with a savings account, unlike with a CD.

If rates are rising and your bank is slow to raise its APY, that is a sign to shop around. You might find a better rate elsewhere. If rates are falling, your bank will likely lower your APY too, and most other banks will do the same. In that case, moving money does not help much.

Frequently Asked Questions

Does APY change if I withdraw money from my account?

The APY itself does not change, but the amount of interest you earn does. APY is the rate the bank pays; your actual earnings depend on how much money is in the account and for how long. If you withdraw half your balance mid-year, you earn interest only on the remaining balance for the rest of the year.

Is the interest I earn on a savings account taxable?

Yes. Interest earned on a savings account is considered income by the IRS. If you earn $10 or more in interest during the year, your bank will send you a 1099-INT form, and you must report it on your tax return. Keep records of the interest you earn.

Can I lock in an APY rate so it does not go down?

Not with a regular savings account. Banks can lower the APY whenever they want. If you want a may provide rate, open a CD instead. CDs lock in the APY for the full term—three months, one year, five years, or whatever you choose. If you withdraw early, you pay a penalty.

What is a good APY for a savings account right now?

APY rates change based on Federal Reserve decisions and vary by bank. Online banks typically offer higher rates than traditional banks. Check current rates on bank websites or financial comparison sites to see what is available. Compare at least three banks before deciding.

Does my bank compound interest daily on savings accounts?

Most banks do compound daily, which is why they show APY instead of a simple rate. Check your account agreement or ask your bank directly to confirm how often interest is compounded. Daily compounding is standard, but it is worth verifying.