Interest is money the bank pays you for letting them use your deposit

When you put money in a savings account, the bank lends that money to other customers through mortgages, car loans, and business lines of credit. In exchange, the bank pays you interest—a percentage of your balance, calculated and added to your account on a schedule set by the bank. This is how you make money in a savings account without doing anything after the initial deposit.

The amount you earn depends on three things: how much money sits in the account, what interest rate the bank offers, and how often the bank compounds the interest (adds earned interest back into your balance so it earns interest too). A $10,000 deposit at 4.5% annual interest will earn roughly $450 per year if compounded annually, though the actual amount varies slightly based on the compounding method.

Interest rates change constantly and vary widely between banks. Online banks typically offer higher rates than brick-and-mortar banks because they have lower overhead costs. Rates also shift with the Federal Reserve's decisions about the broader economy—when the Fed raises its benchmark rate, savings account rates usually rise within weeks or months.

Key Takeaways

  • Banks pay interest on savings account balances as a percentage of your money, and the rate varies by bank and changes over time.
  • Online banks usually offer higher interest rates than traditional banks, sometimes 10 to 15 times higher depending on market conditions.
  • Compound interest means interest earned gets added back to your balance and earns interest itself, so your money grows faster the longer it sits.
  • The actual dollars you earn depend on your balance, the annual percentage yield (APY), and how the bank compounds interest—daily, monthly, or annually.

Annual Percentage Yield (APY) tells you the real rate you'll earn

Banks advertise interest rates in two ways: the interest rate (also called the annual percentage rate or APR) and the Annual Percentage Yield or APY. The APY is the number that matters because it includes the effect of compound interest. If a bank says "4.5% APY," that means after one year of leaving money untouched, your balance will be 4.5% higher than when you started.

The difference between APR and APY becomes visible over time. A bank might advertise 4.4% APR compounded daily, which works out to 4.5% APY. The daily compounding means interest gets added to your account every single day, and each day's interest is calculated on the new, slightly larger balance. Over a year, this daily addition adds up to more than if interest were added once at year's end.

When comparing banks, always look at the APY, not the advertised rate. Two banks might advertise similar rates, but the one that compounds more frequently will earn you slightly more money. The difference is small on small balances but becomes meaningful on $50,000 or more.

High-yield savings accounts earn significantly more than standard accounts

High-yield savings accounts are ordinary savings accounts offered by online banks and some credit unions that pay APY rates roughly 10 to 15 times higher than traditional bank savings accounts. In early 2024, standard bank savings accounts paid around 0.01% to 0.05% APY, while high-yield accounts paid 4% to 5.35% APY. This gap exists because online banks have lower costs and pass those savings to customers through higher rates.

The tradeoff is access. High-yield accounts have no physical branches, so you deposit and withdraw money through transfers, mobile apps, or ATM networks. Most high-yield accounts have no monthly fees and no minimum balance requirements, though some require a small opening deposit ($0 to $25). You can move money in and out whenever you need it—these are not locked-term accounts.

The rates on high-yield accounts change frequently, sometimes weekly. If you open an account at 5.35% APY, the bank might lower it to 4.8% a few months later if the Federal Reserve cuts rates. This is normal and happens to all banks. Checking the current rates before opening an account matters, but remember that even a lower rate still beats what traditional banks offer.

Money market accounts combine checking features with higher interest

Money market accounts are a hybrid between a savings account and a checking account. They pay interest like a savings account but let you write checks or use a debit card like a checking account. Interest rates on money market accounts are usually lower than high-yield savings accounts but higher than standard savings accounts—typically 3% to 4.5% APY depending on the bank and current market conditions.

Money market accounts often have higher minimum balance requirements than savings accounts, sometimes $2,500 to $10,000. Some banks waive the minimum if you set up automatic deposits or keep a linked checking account open. A few banks limit how many withdrawals or checks you can write per month, though this restriction is less common than it used to be.

Money market accounts make sense if you want to earn interest on money you might need to access quickly and don't want to move it between multiple accounts. If you're comfortable keeping your money in a separate account and transferring it when needed, a high-yield savings account usually pays more interest.

Certificates of Deposit lock your money away for a may provide rate

Certificates of Deposit or CDs are accounts where you agree to leave money untouched for a set period—typically 3 months to 5 years—in exchange for a higher interest rate that won't change. A 1-year CD might pay 5.0% APY while a high-yield savings account pays 4.5%, and you know that 5.0% rate is locked in no matter what happens to the market.

The catch is that withdrawing money before the term ends costs you. Most banks charge an early withdrawal penalty equal to a few months of interest. If you open a 1-year CD at 5.0% APY and withdraw after 6 months, you might lose 3 months of interest as a penalty, leaving you with less money than if you'd put it in a high-yield savings account instead.

CDs work best for money you won't need for a specific period—a down payment you're saving for in 2 years, or an emergency fund you're building over 18 months. If you might need the money sooner, a high-yield savings account is safer because you can withdraw without penalty. Some banks offer "no-penalty CDs" with slightly lower rates but no early withdrawal fee, which can be a middle ground.

How to calculate what you'll actually earn

The formula for interest earned is straightforward: multiply your balance by the APY, then divide by the number of years. A $10,000 balance at 4.5% APY earns roughly $450 per year. A $50,000 balance at the same rate earns $2,250 per year. If you leave the money for only 6 months, divide the yearly amount in half.

Most banks show you the projected interest on their website before you open an account. You enter your deposit amount and the account type, and the calculator shows how much you'll earn in 1 year, 3 years, and 5 years. These projections assume the rate stays the same, which it won't—rates will change—but they give you a realistic picture of the ballpark.

Compound interest means your money grows faster the longer it sits. After 1 year at 4.5% APY, $10,000 becomes $10,450. After 2 years, it's not $10,900—it's $10,920.25, because the second year's interest is calculated on $10,450, not the original $10,000. This difference is tiny on small balances but becomes significant on larger amounts or over decades.

Where to find current rates and open an account

Interest rates change constantly, so checking the current rates before opening an account is important. Websites like Bankrate, DepositAccounts, and NerdWallet list current rates from dozens of banks and update them daily. You can sort by account type, APY, and minimum balance to compare options side by side.

Once you've chosen a bank, opening an account takes 10 to 20 minutes online. You'll need your Social Security number, a government ID, your address, and a way to fund the account—either a bank transfer from another account or a check deposit. Most banks let you start earning interest within 24 hours of funding the account.

After opening, check your account statement monthly to confirm interest is being added. The amount should match what the bank promised. If you notice the rate has dropped significantly, you can open a new account at a different bank and transfer your money—there's no penalty for moving savings between banks, and rates change often enough that shopping around every year or two can add up to real money.

Frequently Asked Questions

Do I have to pay taxes on interest I earn?

Yes. Interest earned in a savings account is taxable income. Banks send you a 1099-INT form each January if you earned $10 or more in interest during the previous year. You report this on your tax return. The tax you owe depends on your overall income and tax bracket, but it's typically 10% to 37% of the interest earned.

What happens if the bank fails?

Your money is protected by the Federal Deposit Insurance Corporation (FDIC) up to $250,000 per account type per bank. If a bank fails, the FDIC pays you back in full. This protection covers savings accounts, checking accounts, and CDs. Money market accounts are also covered. If you have more than $250,000, split it across multiple banks to keep all of it protected.

Can I move money between savings accounts without losing interest?

Yes. Transferring money between your own accounts at different banks doesn't affect interest—you'll earn interest at each bank based on the balance you hold there. Moving money between accounts at the same bank also doesn't affect interest. The only time you lose interest is if you withdraw from a CD before the term ends and the bank charges an early withdrawal penalty.

Is a savings account better than investing in stocks?

Savings accounts and stocks serve different purposes. Savings accounts are safe and predictable—you know exactly what you'll earn. Stocks can earn more over long periods but can also lose value. Most financial advisors suggest keeping 3 to 6 months of expenses in a savings account for emergencies, then investing additional money in stocks or other investments for longer-term goals.

How often does interest get added to my account?

Most banks compound interest daily, meaning it's calculated and added every single day. Some compound monthly or quarterly. Daily compounding earns you slightly more money over time. You can ask your bank how often they compound, or check the account agreement before opening.