Banks pay you interest by giving you a percentage of your account balance each month or year, and the rate depends on the bank, account type, and current market conditions

When you keep money in a savings account, the bank uses that money to make loans to other customers. In exchange, the bank pays you interest—a small percentage of your balance as compensation. The amount you earn depends on three things: how much money you have in the account, what annual percentage yield (APY) the bank offers, and how long the money sits there.

Interest is usually calculated daily but paid monthly or quarterly. If your account earns 4.5% APY and you have $1,000 in the account for a full year, you would earn roughly $45 (though the exact amount varies slightly depending on how the bank calculates daily interest). The longer your money stays in the account and the higher the APY, the more you earn.

Key Takeaways

  • Interest rates on savings accounts vary widely between banks, from under 0.01% at some large national banks to over 5% at online banks and credit unions.
  • APY (annual percentage yield) is the rate you should compare across banks, because it includes the effect of compound interest over a year.
  • Interest is usually calculated on your daily balance but paid out monthly or quarterly, so money deposited mid-month still earns some interest that month.
  • High-yield savings accounts at online banks typically pay more interest than traditional savings accounts at brick-and-mortar banks.
  • Moving your savings to a higher-APY account can earn you hundreds of dollars more per year on the same balance.

How APY works and why it matters more than the interest rate

Banks advertise two different numbers: the interest rate and the APY. The interest rate is the basic percentage the bank pays. The APY is the rate you actually earn because it includes compound interest—interest paid on your interest.

Here's the difference: if a bank offers 4% interest and compounds monthly, your money earns a tiny bit of interest in month one, then in month two you earn interest on both your original balance and the interest from month one. Over a year, this compounding adds up. The APY shows you the total you'll earn after a full year of compounding. Always compare APY numbers when choosing between accounts, not the base interest rate.

The Federal Reserve sets a benchmark interest rate that influences what banks pay. When the Fed raises rates, banks typically raise the APY on savings accounts within weeks. When the Fed cuts rates, banks usually cut savings APY quickly too. This means the rate you see today may be different in three months.

Where to find the highest APY for your savings

Online banks and credit unions typically offer higher APY than traditional banks with physical branches. A large national bank might pay 0.01% to 0.5% APY, while an online bank might pay 4% to 5.5% APY on the same type of account. The difference exists because online banks have lower overhead costs—no building leases, fewer employees—so they pass savings to customers through higher rates.

You can compare current rates on banking websites, financial comparison sites, or by calling banks directly. The rates change frequently, so a rate that was best last month may not be best this month. Check the fine print for any requirements: some banks require a minimum balance to earn the advertised rate, or they pay a lower rate if your balance drops below a threshold.

Credit unions often pay competitive rates and may offer additional benefits like lower fees or easier loan terms if you're a member. To join a credit union, you typically need to live or work in a specific area or belong to a particular group—check your employer or local options.

How interest is calculated and when you receive it

Banks calculate interest on your daily balance—the amount of money in your account each day. If you deposit $500 on the 15th of the month, the bank counts that $500 starting the 15th. Interest accrues (builds up) every day, but you don't see the money until the bank pays it out.

Most banks pay interest monthly or quarterly. Some pay annually. When interest is paid, it's deposited directly into your account, and from that point forward, you earn interest on the interest too. If you withdraw money before the interest is paid, you lose the accrued interest for that period—it doesn't carry over.

The exact calculation depends on the bank's method. Most use a "daily balance" method: they add up your balance for each day of the month, divide by the number of days, then apply the daily interest rate to that average. A few banks use other methods that may pay slightly more or less, but the difference is usually small.

Why rates on savings accounts change and what to do about it

Savings account APY moves with the Federal Reserve's benchmark rate. When the Fed raises its rate, banks raise savings APY within a few weeks to stay competitive. When the Fed cuts rates, banks cut savings APY quickly—sometimes within days. This means your rate today is not locked in; it can go up or down.

If rates fall, your earnings drop automatically. If rates rise, your earnings increase, but only if your bank raises its rate. Some banks are slow to raise rates when the Fed moves up, so shopping around every few months can pay off. Moving your money to a bank with a higher rate takes a few days but can earn you significantly more over time.

You can set a reminder to check rates every three to six months. If your current bank's rate falls behind, you can open a new account at a higher-paying bank and transfer your balance. There's no penalty for moving money between banks, and you can keep multiple savings accounts open at once.

Certificates of Deposit (CDs) as an alternative to regular savings accounts

If you know you won't need your money for a set period—say, six months or a year—a Certificate of Deposit (CD) may pay more interest than a regular savings account. A CD is an account where you agree to leave your money untouched for a fixed term. In exchange, the bank pays a higher APY.

The tradeoff is access: if you withdraw money from a CD before the term ends, you pay a penalty (usually a few months' worth of interest). CDs are useful if you have money you're saving for a specific goal and won't need it before the CD matures. Current CD rates often match or exceed high-yield savings account rates, so compare both before deciding.

CDs come in different terms: 3 months, 6 months, 1 year, 2 years, 5 years, and longer. Longer terms usually pay higher rates. Some banks offer "no-penalty CDs" that let you withdraw early without a penalty, though the rate is usually lower than a standard CD.

How taxes affect the interest you actually keep

Interest you earn on a savings account is taxable income. The bank will send you a 1099-INT form each January showing how much interest you earned the previous year. You report this on your tax return, and you owe federal income tax on it (and state income tax in most states).

This means the interest you actually keep depends on your tax bracket. If you earn $100 in interest and you're in the 22% tax bracket, you owe $22 in federal tax, leaving you $78. High-yield savings accounts still come out ahead because the higher APY more than makes up for the tax, but it's worth knowing that your net earnings are lower than the interest amount shown.

If you earn less than $10 in interest in a year, the bank may not send you a 1099-INT, but you still owe tax on it. Keep your own records of interest earned if the amount is small.

Frequently Asked Questions

Can I lose money in a savings account?

No. Your principal (the money you deposit) is protected by FDIC insurance up to $250,000 per account at banks, or by NCUA insurance at credit unions. Interest rates can fall, so you earn less, but your balance won't go down unless you withdraw money.

How much interest will I earn on $10,000?

At 4.5% APY, you'd earn roughly $450 per year. At 0.5% APY, you'd earn roughly $50 per year. The difference is $400—which is why shopping for a higher rate matters. Exact amounts vary based on how often interest is compounded and when you deposit the money.

Should I move my money to a higher-rate account?

If your current bank pays less than 1% APY and online banks are paying 4% or higher, moving your money could earn you hundreds more per year with no risk. The transfer takes a few days and costs nothing. The only reason not to move is if you value the convenience of a local branch more than the extra earnings.

What happens to my interest if I withdraw money mid-month?

You keep the interest that accrued up to the day you withdrew. Interest is calculated daily, so if you withdraw on the 15th, you earn interest for the 15 days your money was in the account. You don't lose accrued interest by withdrawing early from a regular savings account.

Do all banks calculate interest the same way?

Most use the daily balance method, but some use other methods. The differences are small—usually a few dollars per year on typical balances. What matters much more is the APY rate itself. A bank paying 4.5% APY will always beat a bank paying 0.5% APY, regardless of calculation method.