Annual Percentage Yield is the real rate your money grows each year

Annual Percentage Yield (APY) is the percentage of money your savings account will earn over one year, including the effect of compound interest. It's the number banks show you to tell you how much your balance will actually grow. If a savings account offers 4.50% APY and you deposit $1,000, you'll earn roughly $45 in interest over twelve months (though the exact amount depends on how often the bank compounds your interest and whether you add or withdraw money during the year).

APY is different from the interest rate alone because it accounts for compounding — the way banks pay interest on your interest. A bank might advertise an interest rate of 4.48%, but when that interest gets added to your account and then earns interest itself, the actual return you see is the APY of 4.50%. Banks are required to show you the APY, not just the rate, so you can compare accounts honestly.

Key Takeaways

  • APY tells you the actual yearly return on your savings, including compound interest, so it's always equal to or higher than the stated interest rate.
  • The difference between APY and the interest rate grows larger when banks compound interest more frequently (daily compounding beats monthly).
  • You'll find the APY displayed on every savings account disclosure, usually near the top, so you can compare accounts side by side.
  • Your actual earnings depend on your balance, how long money stays in the account, and whether you make deposits or withdrawals during the year.

How compounding makes APY higher than the interest rate

When a bank compounds your interest, it adds the interest you've earned to your balance, and then the next time it calculates interest, it pays interest on that larger amount. This creates a snowball effect. If your account compounds daily, you earn interest on your interest 365 times a year. If it compounds monthly, you earn interest on your interest only 12 times.

The more often compounding happens, the higher your APY climbs above the base interest rate. A 4.48% interest rate compounded daily might become 4.50% APY, while the same rate compounded monthly might only reach 4.49% APY. Banks must tell you how often they compound, usually in the account agreement or disclosure document.

Where to find APY and what to compare

Every bank must display the APY on the account disclosure form you receive when you open a savings account, and it's also shown on the bank's website for each account type. Look for a line that says "Annual Percentage Yield" or "APY" — it will be a percentage, often highlighted. This is the number to use when comparing one bank's savings account to another's.

When you're shopping for a savings account, write down the APY from each bank you're considering, along with any fees (monthly maintenance fees, minimum balance requirements, or withdrawal limits). A higher APY matters more if you're keeping money in the account for a full year, but fees can eat into your earnings if you're not careful. A 4.75% APY with a $10 monthly fee is worse than 4.50% APY with no fees if you're only keeping $2,000 in the account.

APY changes over time and varies by bank

Banks raise and lower their APY based on what the Federal Reserve does with interest rates. When the Fed raises its benchmark rate, banks typically increase the APY they offer on savings accounts within days or weeks. When the Fed cuts rates, banks lower APY just as quickly. This means the APY you see today might be different next month.

Some banks offer much higher APY than others, even when the Fed's rate hasn't changed. Online banks and credit unions often pay higher APY than large brick-and-mortar banks because they have lower overhead costs. A national bank might offer 0.01% APY while an online bank offers 4.50% APY on the same type of account. The difference compounds dramatically over time, so it's worth checking what's available before you decide where to keep your savings.

How to calculate what you'll actually earn

To estimate your earnings, multiply your account balance by the APY and divide by 12 to get a rough monthly figure. If you have $5,000 in an account with 4.50% APY, you'd earn roughly $225 per year, or about $18.75 per month. This assumes your balance stays the same all year and you don't withdraw or deposit money.

Your actual earnings will be slightly different because compounding happens throughout the year, not all at once. If you add money to the account mid-year, that new money earns interest for only part of the year. If you withdraw money, your balance is lower for the rest of the year and earns less. Banks calculate your exact interest earned based on your daily balance, so your statement will show the precise amount at the end of each month or quarter.

APY versus interest rate: why the distinction matters

The interest rate is what the bank pays you on your balance. The APY is what you actually earn when you account for how often that interest gets compounded. A bank might advertise a 4.48% interest rate, but if it compounds daily, you'll see 4.50% APY on your statement. The difference seems small, but over years it adds up.

When you're comparing accounts, always use APY, not the interest rate. APY is the apples-to-apples number because it includes compounding. Two banks might have different interest rates but the same APY if one compounds more frequently than the other. The APY is what matters for your actual money.

Frequently Asked Questions

Does APY change if I withdraw money before the year is over?

Your APY doesn't change, but your earnings do. APY is an annual rate, so if you withdraw money mid-year, you earn interest only on the balance you had for the time it was in the account. A $5,000 balance earning 4.50% APY earns $225 per year, but if you withdraw $2,500 after six months, you'd earn roughly $112 instead.

Is APY the same at every bank?

No. Banks set their own APY based on their costs and competition. Online banks often offer higher APY than traditional banks. Credit unions may offer competitive rates to members. The Federal Reserve's rate influences all banks, but they don't all move at the same speed or to the same level.

What's the difference between APY and APR?

APY is for savings accounts and shows what you earn. APR (Annual Percentage Rate) is for loans and credit cards and shows what you pay. APY includes compounding in your favor; APR includes compounding against you. Never confuse the two when comparing products.

Can I lock in an APY rate so it doesn't go down?

No. Savings account APY is variable, meaning banks can change it anytime. Some accounts like CDs (Certificates of Deposit) do lock in a rate for a set period, but regular savings accounts do not. If rates fall, your APY falls with them.

Does a higher APY mean the bank is less safe?

Not necessarily. Online banks offer higher APY partly because they have lower costs, not because they're riskier. As long as the bank is FDIC-insured (which you can verify on the FDIC website), your deposits are protected up to $250,000 per account type, regardless of APY.