Banks pay interest on deposits because they lend that money out at higher rates
When you deposit money in a bank account, the bank takes that cash and lends it to other customers as mortgages, car loans, and business loans. Those borrowers pay the bank interest on what they owe. The bank keeps some of that interest as profit and pays you a smaller portion as a reward for letting them use your money. The difference between what borrowers pay and what you receive is how the bank makes money from your account.
This arrangement benefits both sides. You earn something on money sitting in your account instead of earning nothing. The bank gets a pool of cash to lend out without having to borrow it from somewhere else at a higher cost. The interest rate you receive depends on how much money you have, what type of account it is, and what the bank's current rates are — which move up and down based on what the Federal Reserve does with its own interest rates.
Key Takeaways
- Banks lend out the money you deposit and pay you interest from the profit they make on those loans.
- The interest rate you earn is always lower than the rate borrowers pay, which is where the bank's profit comes from.
- Savings accounts, money market accounts, and certificates of deposit (CDs) typically pay different rates because they carry different risks and lock-up periods for the bank.
- When the Federal Reserve raises its rates, banks eventually raise what they pay depositors; when rates fall, so do deposit rates.
- Online banks often pay higher deposit rates than brick-and-mortar banks because they have lower overhead costs.
How the interest spread works
A spread is the gap between what a bank pays you and what it charges borrowers. If a bank pays you 4.5% on a savings account and charges a borrower 7% on a personal loan, the spread is 2.5%. That spread covers the bank's operating costs — salaries, buildings, technology — and provides profit to shareholders.
The spread is not fixed. It changes based on how much money the bank needs to attract and how much demand there is for loans. During periods when people are saving heavily and loan demand is low, banks may shrink the spread and pay depositors more to stay competitive. When loan demand is high and savings are scarce, banks can widen the spread and pay less on deposits.
Some deposits are riskier for the bank than others, which affects the rate. A checking account, where you can withdraw money anytime, is riskier than a certificate of deposit where you agree to leave money untouched for a set period. That is why CDs typically pay more — the bank knows it can count on that money for months or years and can make longer-term loans with it.
Why rates change when the Federal Reserve moves
The Federal Reserve is the central bank of the United States, and it sets a target range for the interest rate that banks charge each other for overnight loans. This rate, called the federal funds rate, influences every other interest rate in the economy — including what banks pay on deposits.
When the Federal Reserve raises its target rate, banks face higher costs for borrowing money from each other and from the Fed itself. To offset that cost, they raise the rates they pay on deposits to attract more savings. When the Fed lowers rates, banks lower deposit rates because their borrowing costs fall and they need less new money coming in.
The change is not immediate. Banks may wait weeks or months to adjust deposit rates after a Fed move, especially if they are trying to attract more savings or if they have plenty of deposits already. You might see one bank raise its rate quickly while another waits, which is why shopping around for the best rate matters.
Different account types, different rates
Banks offer different rates on different products because each one carries different economics for the bank:
- Checking accounts typically pay little to no interest because the money can leave at any moment and the bank cannot reliably lend it out long-term.
- Savings accounts pay more than checking because withdrawals are limited (usually six per month under older rules, though that has loosened), giving the bank more predictability.
- Money market accounts pay higher rates still and often require a larger minimum balance, which signals to the bank that the customer is less likely to withdraw frequently.
- Certificates of deposit (CDs) pay the highest rates because you agree to leave the money untouched for a fixed term — three months, one year, five years. The bank can lend that money out with confidence.
Within each category, rates vary by bank. Online banks almost always pay more on savings and money market accounts than traditional banks because they have no physical branches and lower staff costs. A large national bank might pay 0.01% on savings while an online bank pays 4.5% on the same account type.
What happens to your interest when rates fall
When the Federal Reserve cuts rates, banks lower deposit rates faster than they lower loan rates. This protects the bank's spread. A borrower with a fixed-rate mortgage sees no change, but a depositor sees their savings rate drop within weeks. This asymmetry is one reason why savers often feel squeezed when rates are falling.
If you are in a CD with a fixed rate, you are protected — the rate stays the same until the CD matures. But when it does mature and you roll it into a new CD, the new rate will reflect current market conditions. This is why people who built a CD ladder during high-rate periods sometimes face disappointment when rates drop and they have to reinvest at lower rates.
Why some banks pay more than others
Online banks dominate the high-rate deposit market because they operate with lower costs. They have no tellers, no branch buildings, no regional managers. That savings gets passed to depositors as higher rates. A customer at an online bank might earn 4.5% on savings while a customer at a traditional bank earns 0.5% on the same account.
Large national banks often pay less because they have more deposits than they need. They can afford to offer low rates and still attract money because of brand recognition and convenience. Smaller regional banks sometimes offer competitive rates to attract deposits in their market, but they may not be available nationwide.
Credit unions, which are member-owned rather than shareholder-owned, sometimes pay higher rates on deposits and charge lower rates on loans because they return profits to members rather than outside investors. However, credit unions are smaller and may not offer all the products or technology that banks do.
The relationship between deposit rates and inflation
Deposit rates matter most when compared to inflation. If inflation is running at 3% and your savings account pays 0.5%, you are losing purchasing power — your money buys less next year even though the account balance is higher. This is why savers pay attention to whether rates are keeping up with inflation.
During periods of high inflation, the Federal Reserve raises rates aggressively, and deposit rates eventually follow. This happened in 2022 and 2023, when inflation spiked and the Fed raised rates sharply. Savers who moved money to high-yield savings accounts or CDs suddenly earned 4% to 5%, which was closer to inflation. As inflation cooled and the Fed stopped raising rates, deposit rates stabilized and then began to fall again.
Frequently Asked Questions
Do I have to pay taxes on the interest I earn on deposits?
Yes. Interest on savings accounts, money market accounts, and CDs is taxable income. Banks send you a 1099-INT form each January reporting the interest you earned in the previous year, and you report that amount on your tax return. The tax rate depends on your overall income and tax bracket.
Why do some banks offer promotional rates that are higher than their regular rates?
Banks use promotional rates to attract new customers or to encourage deposits during periods when they need cash. The promotional rate usually applies for a limited time — three months, six months, one year — and then drops to the regular rate. Read the terms carefully to understand when the rate changes and what the regular rate will be.
Is my deposit insured if the bank fails?
Yes, up to $250,000 per depositor per bank through the Federal Deposit Insurance Corporation (FDIC). If you have more than $250,000, spread it across multiple banks to keep all of it insured. Credit union deposits are insured up to $250,000 through the National Credit Union Administration (NCUA).
Can a bank lower my interest rate on an existing account without warning?
Yes, banks can lower rates on savings accounts and money market accounts at any time. They typically notify you in advance, but the notice period varies. If you have a CD, the rate is locked in and cannot change until the CD matures. After maturity, if you renew, the new rate reflects current market conditions.
What is the difference between APY and APR on deposit accounts?
APY (annual percentage yield) includes the effect of compounding — interest earned on interest — and is what matters for deposits. APR (annual percentage rate) does not include compounding and is used mainly for loans. Always compare APY when shopping for savings accounts, because it shows the true amount you will earn.