Interest is how banks pay you to keep money in a savings account
Banks pay you interest on the money you deposit in a savings account. The bank lends your money to other customers and businesses, and shares a portion of what it earns back to you as interest. The amount you earn depends on the interest rate the bank offers, how much money you keep in the account, and how long it stays there.
Interest accrues — meaning it builds up — either daily, monthly, or quarterly, depending on the account. Some banks compound interest, which means they calculate interest on your original deposit plus any interest you've already earned. Compounding makes your money grow faster than simple interest, where you only earn on your original balance.
You don't have to do anything to earn this interest. Once you open an account and deposit money, the interest begins accumulating automatically. The bank deposits it into your account on a schedule they set — often monthly or quarterly.
Key Takeaways
- Interest rates on savings accounts vary by bank and change over time, so comparing rates before opening an account can significantly affect your earnings.
- High-yield savings accounts typically offer rates two to ten times higher than traditional savings accounts at large banks.
- Compound interest means you earn interest on your interest, which accelerates growth the longer money stays in the account.
- The amount you earn depends on three factors: the interest rate, your account balance, and how long the money remains deposited.
How interest rates work and why they change
Each bank sets its own interest rate on savings accounts. Rates are measured as an Annual Percentage Yield (APY), which shows what percentage of your balance you'll earn over one year if the rate stays constant. A 4.5% APY means that on a $10,000 balance, you'd earn roughly $450 in a year (before any fees reduce it).
Interest rates rise and fall based on what the Federal Reserve does with its benchmark rate. When the Fed raises rates, banks typically raise the rates they offer on savings accounts. When the Fed lowers rates, savings account rates usually fall too. This means the rate you see today may be different in three months or six months.
Banks also compete for deposits. A bank trying to attract new customers might offer a higher rate than its competitors. Online banks often offer higher rates than brick-and-mortar banks because they have lower overhead costs. Checking the current rates at several banks before you open an account can make a real difference in how much you earn.
The difference between high-yield and traditional savings accounts
A traditional savings account at a large national bank typically offers a rate between 0.01% and 0.5% APY. On a $10,000 balance, that's $1 to $50 per year. These accounts are convenient if you already bank there, but the earnings are minimal.
A high-yield savings account (HYSA) usually offers rates between 4% and 5.5% APY, depending on current market conditions. The same $10,000 would earn $400 to $550 per year. The trade-off is that high-yield accounts are almost always at online banks, so you access your money through a website or app rather than walking into a branch.
Both types of account are insured by the Federal Deposit Insurance Corporation (FDIC) up to $250,000 per depositor per bank, so your money is protected either way. The choice comes down to whether you value convenience and branch access more than earning significantly more interest.
How to calculate what you'll earn
The basic formula is: Balance × APY ÷ 12 = Monthly earnings. If you have $5,000 in an account with a 4.8% APY, you'd earn roughly $20 per month ($5,000 × 0.048 ÷ 12). Over a year, that's about $240.
If your account compounds interest daily (which most do), the actual amount is slightly higher because you earn interest on your interest. But the difference is small enough that the simple formula above gives you a realistic estimate.
Your earnings change if your balance changes. Deposit an extra $2,000 and your monthly earnings jump. Withdraw $1,000 and they drop. Banks calculate interest based on your balance each day, so deposits and withdrawals affect your total earnings for that month.
Fees that reduce what you actually earn
Some savings accounts charge monthly maintenance fees, inactivity fees, or fees for falling below a minimum balance. A $10 monthly fee on an account earning $20 per month cuts your earnings in half. Before opening an account, check whether it has any fees and what conditions trigger them.
Most high-yield savings accounts have no monthly fees. Many traditional savings accounts at large banks charge $5 to $10 per month unless you maintain a high minimum balance (often $500 to $2,500). Read the account terms carefully — the fee structure can wipe out most or all of your interest earnings.
Some accounts waive fees if you set up direct deposit or maintain a linked checking account. Others waive fees only if your balance stays above a certain amount. Knowing these rules before you open the account helps you avoid surprise charges.
When interest rates are rising versus falling
When the Federal Reserve is raising rates, savings account rates typically climb over several months. If you're planning to open a savings account during a rising-rate environment, you might benefit from waiting a few weeks to see if rates go higher. But you also miss out on interest during those weeks, so the gain is usually small.
When rates are falling, the opposite is true. Banks lower their rates more slowly than the Fed cuts its benchmark rate, but they do eventually lower them. If you see a rate you like during a falling-rate period, locking it in sooner rather than later makes sense.
Checking rate-tracking websites like Bankrate or DepositAccounts can help you see whether rates are trending up or down. But don't overthink it — the difference between opening an account today versus waiting two weeks is usually just a few dollars.
Frequently Asked Questions
Do I have to pay taxes on savings account interest?
Yes. Interest earned on a savings account is taxable income. Banks send you a 1099-INT form at the end of the year if you earned $10 or more in interest. You report this on your tax return. The tax you owe depends on your overall income and tax bracket.
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 bank. Interest rates can go down, which means you earn less, but you won't lose what you put in. The only way to have less money is if you withdraw it yourself.
What's the difference between APY and APR?
APY (Annual Percentage Yield) includes compound interest, so it shows the real amount you'll earn. APR (Annual Percentage Rate) does not include compounding. For savings accounts, always look at the APY, not the APR, because APY is the accurate number.
Should I move my money to a high-yield account if I only have a small balance?
If you have $1,000 or less, the difference in earnings between a traditional account (0.1% APY) and a high-yield account (4.5% APY) is only about $4 per year. The convenience of a local bank might matter more to you. But if you have $5,000 or more, the difference becomes meaningful enough to consider switching.
Can a bank lower my interest rate without warning?
Yes. Banks can change rates at any time, and they're not required to notify you in advance. You'll see the new rate reflected in your account statements. If a bank lowers its rate significantly, you can move your money to another bank offering a better rate.