Banks lend out the money you deposit, and keep the difference between what they pay you and what borrowers pay them

When you put money in a savings account, the bank does not lock it in a vault with your name on it. Instead, the bank uses your deposit as raw material for lending. A bank that holds $100 million in savings accounts might lend out $80 to $90 million of that to mortgage borrowers, car buyers, and businesses. Those borrowers pay interest on their loans. You receive a much smaller interest rate on your savings. The bank keeps the spread—the gap between what it pays depositors and what it collects from borrowers.

This is the core business model of retail banking. It has worked the same way for centuries. The bank is not doing you a favour by paying interest; it is compensating you for the use of your money, at a rate low enough that the bank still profits.

Key Takeaways

  • Banks use deposits to fund loans to borrowers, who pay higher interest rates than savers receive.
  • The difference between the interest rate paid to depositors and the rate charged to borrowers is the bank's primary source of profit from savings accounts.
  • Banks also earn fees on savings accounts—monthly maintenance fees, overdraft fees, or fees for falling below a minimum balance—though many accounts waive these.
  • The Federal Reserve sets a benchmark interest rate that influences how much banks pay savers and charge borrowers, so savings rates rise and fall with economic conditions.
  • Banks are required to hold a portion of deposits in reserve and cannot lend out every dollar you deposit.

The interest rate spread is where most of the profit comes from

Suppose you have a savings account earning 0.01% annual interest. On a $10,000 balance, that is $1 per year. Meanwhile, a borrower takes out a $10,000 car loan at 6% interest and pays $600 per year. The bank collected $600 and paid you $1, keeping $599 of that spread.

The exact spread varies by account type and market conditions. A high-yield savings account might pay 4% to 5% in a high-rate environment, narrowing the spread. A traditional savings account might pay 0.01%, widening it. Mortgage rates, auto loan rates, and credit card rates all move in the same direction as savings rates, but they move slower and by smaller amounts. When the Federal Reserve raises its benchmark rate, banks eventually raise what they pay savers—but they raise what they charge borrowers faster and by more.

This spread is not hidden or dishonest. It is how banks cover their operating costs—staff, branches, technology, fraud prevention—and generate profit. But it means the interest you earn is always lower than the interest someone else is paying to borrow.

Banks collect fees on savings accounts, though many are now waived

Beyond the interest spread, banks historically earned money through account fees. A monthly maintenance fee of $5 to $15 was standard on many savings accounts. Some banks charged a fee if your balance fell below a minimum—often $500 to $2,500. Others charged for each withdrawal beyond a certain number per month.

These fees have become less common in recent years, especially at online banks and at large banks competing for deposits. Many savings accounts now carry no monthly fee and no minimum balance requirement. However, fees still exist: overdraft fees (charged when you spend more than your balance), out-of-network ATM fees, and fees for closing an account early if it is a certificate of deposit (CD).

When a bank waives monthly fees, it is not being generous—it is choosing to rely more heavily on the interest spread and less on direct fees. The bank still profits; the profit just comes from a different source.

Reserve requirements limit how much a bank can lend

A bank cannot lend out every dollar you deposit. The Federal Reserve requires banks to hold a minimum percentage of deposits in reserve—money that must stay in the bank's vault or at the Federal Reserve itself, not lent out. This reserve requirement exists to may support banks can meet withdrawal requests and to give regulators a tool to control how much money flows through the economy.

As of 2023, the Federal Reserve eliminated the reserve requirement for most banks, meaning banks can technically lend out nearly all deposits. However, banks still hold reserves voluntarily because regulators expect it and because holding some cash on hand protects against unexpected withdrawal surges. A bank that lends out 95% of deposits and holds 5% in reserve is still earning the interest spread on that 95%.

The reserve requirement (or the voluntary reserve practice) is why banks cannot straightforward hand you back all the interest they collect from borrowers. Some of the money you deposit is not available to lend.

The Federal Reserve's interest rate decisions flow down to savings account rates

The interest rate you earn on a savings account is not set by the bank alone. It responds to the federal funds rate—the interest rate at which banks lend reserve balances to each other overnight. The Federal Reserve does not set this rate directly, but it influences it through open market operations and by paying interest on reserves that banks hold at the Fed.

When the Federal Reserve raises its benchmark rate, banks have an incentive to raise the rates they pay savers, because savers can move their money to competitors offering higher rates. When the Fed cuts rates, banks lower savings rates because savers have fewer alternatives. This is why savings account interest rates are often near zero during economic downturns and rise during periods of high inflation or tight credit.

A bank's savings rate also depends on how much deposit money it needs. A bank flush with deposits from customers might lower its savings rate because it does not need to attract more money. A bank losing deposits to competitors might raise its rate to keep customers from leaving. This is why rates vary widely between banks even when the Fed's benchmark rate is the same.

Banks use deposits to fund different types of lending

Your savings account deposit does not necessarily fund a single loan. Banks pool deposits and lend them out across many borrowers. A portion might fund a mortgage, another portion a business line of credit, another a credit card balance. Banks also buy government bonds and other securities with deposit money, earning interest on those investments.

The type of lending a bank does affects the interest spread it can earn. Mortgage lending is lower-risk and lower-return; mortgage rates are lower than credit card rates. Credit card lending is higher-risk and higher-return; credit card rates are much higher. A bank that specializes in credit cards can earn a wider spread on deposits than a bank that specializes in mortgages, but it also takes on more risk if borrowers default.

This is why different banks offer different savings rates even when they are the same size and operate in the same market. A bank that lends heavily to risky borrowers might pay higher savings rates to attract deposits, because it can afford a narrower spread. A bank that lends to low-risk borrowers might pay lower savings rates because its spread is already wide.

Frequently Asked Questions

Why do savings account rates change so often?

Savings rates track the Federal Reserve's benchmark rate, which changes when the Fed adjusts monetary policy. Banks also adjust rates based on how much deposit money they need and how much they can earn by lending that money out. During periods of rapid Fed rate changes, you may see your savings rate change monthly or even weekly.

Do banks make more money from savings accounts or checking accounts?

Banks typically make more from checking accounts because checking account balances are usually lower and turn over faster, allowing banks to lend the same deposit multiple times. Savings accounts earn the interest spread on larger, longer-term balances. The profit per dollar is higher on savings accounts, but the total profit depends on the size and activity of each account type.

If banks profit from my deposits, why should I keep money in a savings account?

A savings account protects your money through FDIC insurance (up to $250,000 per account) and gives you access to it without penalty. You also earn interest, even if it is modest. The alternative—keeping cash at home—earns nothing and is not insured. A savings account is a trade-off: you give the bank the use of your money, and in return you get safety, insurance, and a small return.

What happens to my deposits if a bank fails?

The FDIC insures deposits up to $250,000 per depositor per bank. If a bank fails, the FDIC pays depositors from its insurance fund. Your money is protected even though the bank used it for lending. This insurance is why banks can safely lend out most of what you deposit—regulators may support depositors do not lose money if the lending goes wrong.

Can I earn more interest by moving my money to a different bank?

Yes. Savings rates vary significantly between banks. Online banks often pay higher rates than brick-and-mortar banks because they have lower operating costs. Comparing rates across banks and moving your money to a higher-paying account is a straightforward way to increase your interest earnings, though the difference is usually modest unless you have a large balance.