Interest is money the bank pays you for letting them use your money
When you deposit money into a savings account, the bank lends that money to other customers—for mortgages, car loans, credit cards. The bank keeps the difference between what it pays you and what it charges borrowers. That payment to you is called interest.
The amount you earn depends on three things: how much money you have in the account, how long it stays there, and the interest rate the bank offers. A higher rate means more money in your pocket. The rate varies by bank and by the type of account, and it changes over time based on what the Federal Reserve does with its own rates.
You do not have to do anything to earn interest. Once you open the account and deposit money, the bank calculates and adds interest automatically on a schedule—usually daily or monthly, depending on the bank's terms.
Key Takeaways
- Interest rates on savings accounts range widely by bank and account type, so comparing rates before you open an account can mean hundreds of dollars more per year.
- High-yield savings accounts typically pay 4 to 5 percent annual interest, while traditional savings accounts at large banks often pay less than 0.5 percent.
- Interest compounds, meaning you earn money on the interest you already earned, so leaving money untouched for longer increases your total gain.
- The bank calculates interest based on your balance, so depositing more money or making fewer withdrawals increases what you earn.
How the interest rate is set and why it changes
Banks set their own interest rates, but they do not choose them in a vacuum. The Federal Reserve—the central bank of the United States—sets a target range for the federal funds rate, which is the rate banks charge each other for overnight loans. When the Fed raises that rate, banks typically raise the rates they offer on savings accounts. When the Fed lowers it, savings rates usually fall.
The Fed adjusts its rate based on inflation and economic conditions. When inflation is high, the Fed raises rates to cool down spending. When the economy slows, the Fed lowers rates to encourage borrowing and spending. These changes ripple through the banking system within weeks or months.
Different banks respond at different speeds. Online banks and credit unions often raise their savings rates faster than large national banks do, because they compete harder for deposits. If you opened a savings account at a major bank two years ago, the rate you are earning now may be much lower than what new customers can get at the same bank or elsewhere.
The difference between straightforward and compound interest
straightforward interest means the bank pays you a percentage of your original deposit once per year. If you deposit $10,000 at 5 percent straightforward interest, you earn $500 the first year, $500 the second year, and so on. Your balance grows in a straight line.
Compound interest means the bank calculates interest on your balance plus any interest you have already earned. Most savings accounts compound daily or monthly. If your account compounds monthly at 5 percent annual interest, the bank divides the annual rate by 12, calculates interest on your current balance, adds it to your account, and then calculates next month's interest on the new, higher balance. Over time, this creates a snowball effect—you earn money on money you earned.
The longer money sits in a compounding account, the bigger the difference becomes. A $10,000 deposit at 5 percent straightforward interest grows to $12,500 after five years. The same deposit at 5 percent compounded monthly grows to $12,833. The gap widens the longer you leave the money untouched.
Why some accounts pay more than others
A high-yield savings account typically pays 4 to 5 percent annual interest, while a traditional savings account at a large national bank might pay 0.01 to 0.5 percent. The difference is not because one bank is generous and another is stingy—it reflects how each bank funds itself and what it costs to run.
Online banks have lower overhead costs than brick-and-mortar banks. They do not maintain physical branches, so they pass some of those savings to customers through higher interest rates. Credit unions, which are member-owned rather than shareholder-owned, also tend to offer competitive rates. Large national banks with thousands of branches can afford to pay less because customers value the convenience of walking into a local office.
Account type matters too. A money market account usually pays more than a basic savings account but requires a higher minimum balance and may limit how many times you can withdraw per month. A certificate of deposit (CD) locks your money away for a set period—three months, one year, five years—and pays a fixed rate that is usually higher than a savings account, because the bank knows exactly how long it can use your money.
How to calculate what you will earn
Banks disclose their interest rate as an annual percentage yield (APY), which accounts for compounding. If a bank advertises 5 percent APY, that is the total return you will get in one year if you deposit money and do not touch it.
To estimate your earnings, multiply your balance by the APY. A $10,000 deposit at 5 percent APY earns roughly $500 in one year. A $25,000 deposit at the same rate earns roughly $1,250. The math is straightforward for one year. For longer periods or to account for deposits and withdrawals, most banks provide a calculator on their website, or you can ask customer service for a projection.
Keep in mind that rates change. If you lock in 5 percent today and the Fed cuts rates in six months, your bank may lower your rate too. Some accounts may provide a rate for a set period; others can change it anytime. Read the account terms before you open it so you know what to expect.
When a savings account is the right place for your money
A savings account makes sense for money you need to keep safe and accessible—an emergency fund, money for a down payment you plan to make in the next few years, or cash you are setting aside for a specific goal. The interest you earn is a bonus, not the main point.
If you have money you will not need for five or more years, a CD or a brokerage account invested in stocks or bonds may earn more over time, though with more risk. If you have money you need to access frequently, the interest rate matters less than the convenience and the lack of withdrawal limits.
The key is to compare rates before you open an account. The difference between a 0.5 percent account and a 5 percent account on a $10,000 balance is $450 per year. That gap widens if you have more money or if you plan to leave it there longer. Spending 15 minutes comparing rates across three or four banks is worth the effort.
Frequently Asked Questions
Do I have to pay taxes on the interest I earn?
Yes. Interest from a savings account is taxable income. The bank will send you a Form 1099-INT at the end of the year if you earned $10 or more in interest. You report that amount on your tax return. The tax rate depends on your overall income and tax bracket.
Can I lose money in a savings account?
Your deposits are protected by the Federal Deposit Insurance Corporation (FDIC) up to $250,000 per account holder per bank. You will not lose your principal. However, if inflation rises faster than your interest rate, the purchasing power of your money decreases—you can buy less with it even though the dollar amount stays the same.
What happens to my interest if I withdraw money before the end of the year?
For a regular savings account, you earn interest on whatever balance you have at the time the bank calculates it. If you withdraw money mid-month, you earn less that month. For a CD, withdrawing early usually triggers a penalty that eats into your earnings or even your principal, so check the terms before you open one.
How often should I check my interest rate?
Check once or twice a year, especially if the Fed has changed rates. If your rate has fallen significantly below what other banks offer, you can move your money to a higher-paying account. There is no penalty for switching banks, and the process usually takes a few days.