Banks pay interest on deposits because they use your money to make money
When you put money in a savings account, the bank doesn't lock it in a vault with your name on it. Instead, the bank lends that money out to other customers — for mortgages, car loans, business loans, and credit cards. The bank charges those borrowers interest. The interest the bank collects from borrowers is higher than the interest it pays to you. That difference is how the bank makes profit.
Interest on your deposits is the bank's way of paying you rent for the use of your money. You're essentially lending the bank your cash, and interest is your compensation for letting them use it.
Key Takeaways
- Banks lend out the money you deposit to other customers and charge those borrowers interest rates higher than what they pay you.
- The gap between what banks pay depositors and what they charge borrowers is the bank's primary source of profit.
- Interest rates on deposits change based on what the Federal Reserve does with its benchmark rate, which shifts with economic conditions.
- Banks compete for deposits by offering higher interest rates when money is scarce or when the Federal Reserve raises its rates.
- You earn interest as compensation for keeping your money in the bank rather than spending it or keeping it at home.
How the bank's lending cycle creates your interest payment
The mechanics are straightforward. You deposit $1,000 in a savings account. The bank takes that $1,000 and lends it to someone buying a house. That borrower pays the bank 6% interest per year on their mortgage. You, the depositor, might earn 4% interest per year on your $1,000. The bank keeps the 2% difference — in this case, $20 per year on your deposit alone.
Multiply that across thousands of depositors and millions of dollars, and that 2% gap becomes the bank's operating revenue. From that revenue, the bank pays its employees, maintains its buildings and technology, covers loan losses when borrowers default, and generates profit for its owners.
Without deposits, the bank has no money to lend. Without the ability to lend, the bank has no business. So banks must attract deposits by offering interest, or customers would keep their money elsewhere.
Why interest rates on deposits go up and down
The interest rate a bank offers you is not fixed forever. It changes based on what the Federal Reserve — the central bank of the United States — does with its benchmark interest rate, called the federal funds rate.
When the Federal Reserve raises its rate, banks can charge borrowers more for loans. This makes deposits more valuable to the bank, so banks raise the interest they pay depositors to compete for that money. When the Federal Reserve lowers its rate, the opposite happens: banks lower deposit interest rates because they're earning less from lending.
Banks also adjust rates based on how much money they need. If a bank has plenty of deposits and doesn't need more, it may lower its rates. If a bank needs more deposits to fund its lending, it raises rates to attract new customers and keep existing ones from moving their money elsewhere.
The difference between savings accounts and checking accounts
Most savings accounts pay interest, but most checking accounts do not — or pay very little. This difference exists because of how banks use the money.
A savings account is designed for money you're not using when ready. The bank can count on that money staying put for weeks or months, so it can safely lend it out for longer-term loans like mortgages. A checking account is designed for money you access frequently — you might withdraw it tomorrow. The bank cannot reliably lend out checking account money, so it has less reason to pay interest on it.
Some banks do offer checking accounts with interest, but the rates are typically much lower than savings accounts. A few online banks and credit unions offer higher rates on checking accounts, but these are exceptions.
Why you don't earn interest on cash at home
If you keep $1,000 under your mattress, it stays $1,000. It doesn't grow. The bank pays you interest because your deposit allows the bank to lend that money and earn income from it. When money sits at home, no one is using it to generate profit, so there's no income to share with you.
This is also why interest rates on deposits are always lower than interest rates on loans. A bank lending money takes on risk — the borrower might not repay. A bank paying interest on deposits takes on less risk because the bank controls the money and can use it as it sees fit. The difference in risk is reflected in the difference in rates.
How inflation affects what your interest earnings are actually worth
Interest on deposits sounds good until you consider inflation — the general rise in prices over time. If your savings account earns 2% interest per year but prices rise 3% per year, your money is actually losing purchasing power. You can buy less with it than you could before, even though the dollar amount is higher.
This is why some people move money to investments like stocks or bonds when deposit interest rates are very low. They're looking for returns that outpace inflation. Banks understand this, which is why they raise deposit rates when they need to compete for money — if rates are too low, customers will take their money elsewhere.
Why online banks often pay more interest than traditional banks
Online banks — banks with no physical branches — typically offer higher interest rates on deposits than banks with many branch locations. This is because online banks have lower operating costs. They don't pay rent on buildings, employ as many tellers, or maintain as much physical infrastructure.
Because their costs are lower, online banks can afford to pay depositors more interest and still make a profit. A traditional bank with 500 branches nationwide has higher expenses, so it keeps a larger share of the lending spread to cover those costs.
This doesn't mean online banks are riskier. Most online banks are insured by the FDIC (Federal Deposit Insurance Corporation), the same government agency that insures traditional banks. Your deposits are protected up to $250,000 per account type at any FDIC-insured bank, whether it has branches or not.
Frequently Asked Questions
Do all banks pay the same interest rate on savings accounts?
No. Interest rates vary widely between banks and change frequently. Online banks typically pay more than traditional banks. Credit unions may offer different rates than banks. Even within the same bank, different account types earn different rates. You can compare current rates across banks to find the highest available.
What happens to my interest if the bank fails?
Your deposits are protected by FDIC insurance up to $250,000 per account type at any FDIC-insured bank. If a bank fails, the FDIC pays you the full amount you're owed, including any interest earned up to the date of failure. This protection applies whether the bank is online or has physical branches.
Can a bank lower my interest rate without warning?
Yes. Banks can change deposit interest rates at any time without notice. This is different from loan rates, which are often locked in for the life of the loan. If you want to lock in a higher rate, some banks offer certificates of deposit (CDs), which may provide a fixed rate for a set period — typically three months to five years.
Why don't banks pay interest on money I just deposited?
Banks do pay interest on all money in the account, including deposits made yesterday. However, interest is calculated and paid on a schedule — usually monthly or daily, depending on the account. You won't see the interest appear in your account when ready after depositing, but it accrues from the day the deposit clears.
Is the interest I earn on deposits taxed?
Yes. Interest earned on deposits is considered income by the IRS and is taxable. Banks report interest earnings to you on a form called a 1099-INT if you earn $10 or more in a year. You report this income on your tax return. Some accounts, like certain retirement accounts, have tax advantages, but regular savings accounts do not.