Banks pay you interest as a percentage of the money you keep in your account
When you deposit money into a savings account, the bank lends that money to other customers through mortgages, car loans, and business loans. In exchange for the use of your money, the bank pays you interest — a small percentage of your balance, calculated and added to your account on a schedule set by the bank. The interest rate varies by bank, account type, and the current economic environment. You earn interest simply by keeping money in the account; you do nothing to trigger it beyond maintaining the account and not withdrawing the funds.
The amount of interest 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 you earn interest on that interest too). A bank offering 4.5% annual percentage yield (APY) on a $10,000 balance will pay you roughly $450 per year, though the actual monthly deposits will be smaller and spread throughout the year.
Key Takeaways
- Interest is money the bank pays you for letting them use your deposits, expressed as a percentage of your account balance.
- The interest rate you receive depends on the bank, the type of account, and current market conditions — rates change over time.
- Interest compounds when the bank adds earned interest back into your balance, so you then earn interest on that interest.
- High-yield savings accounts currently offer higher rates than traditional savings accounts, though rates vary by institution.
- You can track interest earned by checking your account statements or using the bank's online calculator.
How interest rates are set and why they change
Banks set their own interest rates, but they follow the lead of the Federal Reserve, which sets a target range for the rate at which banks lend to each other. When the Federal Reserve raises its rate, banks typically raise the rates they offer on savings accounts. When the Federal Reserve lowers its rate, savings account rates usually fall. This is why the interest rate you see today may be different from the rate you saw six months ago.
Banks also compete with each other for deposits. A bank offering 0.01% APY will lose customers to a bank offering 4.5% APY, so banks adjust their rates to stay competitive. Online banks, which have lower overhead costs than brick-and-mortar branches, often offer higher rates than traditional banks. The trade-off is that you cannot walk into a physical location to deposit cash or speak to someone in person.
Your individual credit score or account history does not affect the interest rate you receive on a savings account. The bank pays the same rate to all customers with the same account type, regardless of how much money they have or how long they have been a customer.
How compounding multiplies your earnings
Compounding is the process of earning interest on your interest. If your account compounds daily, the bank calculates interest on your balance at the end of each day and adds that interest to your account. The next day, the bank calculates interest on the new, larger balance — which now includes the interest you earned yesterday. Over time, this creates a snowball effect where your money grows faster than it would with simple interest alone.
The difference between daily compounding and monthly compounding is small on a $5,000 balance, but it becomes noticeable on larger balances or over many years. A $50,000 balance earning 4.5% APY compounded daily will earn roughly $2,250 per year, while the same balance compounded monthly will earn slightly less. Most savings accounts compound daily, which is why you should look for that detail when comparing banks.
The bank's disclosure documents will state how often interest compounds. This information appears in the account agreement or the Truth in Savings disclosure, which the bank must provide before you open the account.
The difference between APY and interest rate
Annual Percentage Yield (APY) and interest rate are not the same thing, though banks sometimes use the terms loosely. The interest rate is the percentage the bank pays on your balance. The APY is the total return you will receive over one year if you leave the money untouched and the rate does not change — it includes the effect of compounding.
For example, a bank might advertise a 4.40% interest rate compounded daily. When you calculate the effect of daily compounding over a full year, the actual return is 4.50% APY. The APY is always equal to or higher than the interest rate, depending on how often compounding happens. Banks are required to display the APY prominently in their marketing and account disclosures, so you can compare accounts fairly across different banks.
How to find the current interest rate at your bank
Log into your online banking portal or mobile app and look for the account details or account summary section. Most banks display the current APY there. You can also call the customer service number on the back of your debit card or visit a branch in person. The bank's website usually lists current rates for each account type, though the rate you see online may differ slightly from the rate you receive if you opened your account months ago — your rate is locked in when you open the account, and the bank does not retroactively change rates for existing customers.
If you want to compare rates across multiple banks, websites like Bankrate, DepositAccounts, and the Federal Deposit Insurance Corporation (FDIC) rate tracker show current rates at hundreds of banks. These sites update rates regularly and let you filter by account type and state. Keep in mind that rates change frequently, so a rate you see today may be different tomorrow.
When interest is deposited into your account
Most banks deposit interest monthly, though some deposit it quarterly or daily. Check your account statements to see when deposits appear. The bank calculates interest based on your average daily balance during the month, so the amount you receive each month will vary slightly depending on how much money was in the account each day.
If you withdraw money from your account, you do not lose the interest you have already earned — it stays in your account. However, you will earn less interest going forward because your balance is now smaller. Some banks charge a penalty if you withdraw money within a certain time frame, but most savings accounts allow unlimited withdrawals without penalty.
High-yield savings accounts versus traditional savings accounts
High-yield savings accounts are savings accounts offered by banks (usually online banks) that pay significantly higher interest rates than traditional savings accounts at brick-and-mortar banks. As of late 2024, high-yield accounts pay between 4% and 5% APY, while traditional savings accounts at large national banks often pay 0.01% to 0.5% APY. The money is equally safe in both — the FDIC insures deposits up to $250,000 at any bank — but the interest you earn is dramatically different.
The reason online banks offer higher rates is that they have lower costs. They do not maintain physical branches, employ fewer staff, and spend less on real estate. They pass those savings to customers in the form of higher interest rates. The trade-off is convenience: you cannot deposit cash in person, and customer service is available only by phone or email.
If you keep a large emergency fund or are saving toward a specific goal, moving that money to a high-yield account can earn you hundreds or thousands of dollars per year in interest compared to a traditional account. The process takes a few days, but the difference in earnings is substantial.
Frequently Asked Questions
Do I have to pay taxes on interest I earn from a savings account?
Yes. Interest earned in a savings account is taxable income. Banks send you a Form 1099-INT at the end of the year if you earned $10 or more in interest, and you must report that income on your tax return. The amount of tax you owe depends on your total income and tax bracket.
What happens to my interest if I close my account?
You keep all interest that has already been deposited into your account. If you close the account mid-month, you will not receive interest for that partial month — the bank calculates interest through the last day of the previous month only.
Can the bank lower my interest rate without warning?
Yes. Banks can change interest rates at any time without your permission. They must notify you before the change takes effect, usually by email or mail, but they are not required to ask your consent. If you disagree with a rate cut, you can move your money to a different bank.
Is there a minimum balance required to earn interest?
It depends on the bank and account type. Some banks require a minimum balance (often $500 to $2,500) to earn interest, while others pay interest on any balance, no matter how small. Check your account agreement or the bank's website to see if a minimum applies to your account.
How much interest will I earn on $1,000?
At 4.5% APY, $1,000 will earn roughly $45 per year, or about $3.75 per month. At 0.01% APY (typical of traditional banks), the same $1,000 earns roughly 10 cents per year. The difference between high-yield and traditional accounts grows larger as your balance increases.