Banks make money from checking accounts in four main ways: they lend your deposits out at higher interest rates than they pay you, charge account fees, collect interchange fees every time you swipe your debit card, and use the account as a foothold to sell you other financial products. The gap between the near-zero interest you earn and the rates the bank charges its borrowers is by far the largest of these. The national average checking rate sits around 0.07%, while the same dollars fund loans at many times that.
Lending Out Your Deposits
When you deposit money, the bank does not park it in a vault waiting for you to withdraw. It pools your balance with other depositors’ and lends most of it out as mortgages, auto loans, personal loans, and business credit. Since March 2020, the Federal Reserve has set the reserve requirement at zero percent for all depository institutions, so there is no legal floor on how much of your deposit the bank must keep on hand.1Board of Governors of the Federal Reserve System. Reserve Requirements Banks still hold cash for day-to-day withdrawals, but they decide how much.
The profit sits in what bankers call net interest margin: the spread between what they pay depositors and what they charge borrowers. A checking account pays close to nothing. The average 30-year fixed mortgage rate was about 5.98% as of late February 2026, and unsecured personal loans run higher still.2Freddie Mac. Mortgage Rates Earning roughly 6% on a mortgage while paying you a fraction of a percent produces steady income as long as loans perform and deposits keep coming in.
There is also float. When you deposit a check, a short window exists between the deposit and final settlement, and the bank can earn overnight interest on funds in transit. Regulation CC caps how long deposits can be held (the first $225 of most check deposits must be available the next business day, for example), but small delays across millions of transactions add up.3eCFR. 12 CFR Part 229 – Availability of Funds and Collection of Checks (Regulation CC)
Fees Charged Directly to You
The second revenue stream is the one you can see on your statement. Common charges include:
- Monthly maintenance fees, typically $5 to $15, often waived if you keep a minimum balance or set up direct deposit.
- Overdraft and nonsufficient-funds fees, averaging around $35 per occurrence at many institutions. Some large banks have voluntarily reduced or dropped them in recent years, but the fee remains widespread.
- Out-of-network ATM fees, usually $2 to $5 per withdrawal, and sometimes charged by both your bank and the ATM operator.
- Inactivity or dormancy fees when an account goes unused. After roughly two to five years of inactivity, depending on state law, unclaimed funds can be turned over to the state through escheatment.
Together these fees generate billions of dollars a year across the industry. Overdraft charges in particular have long been one of the most profitable line items on a bank’s income statement, though competitive and regulatory pressure has trimmed them at some institutions.
Debit Card Interchange
Every debit card swipe triggers a small fee, called interchange, that the merchant pays to your bank. You never see it on your statement. Individually the amounts are tiny. Across billions of transactions a year, they are not.
How much the bank can collect depends on its size. Under the Durbin Amendment to the Dodd-Frank Act, banks with more than $10 billion in assets are capped at 21 cents plus 0.05% of the transaction, plus another cent if the bank qualifies for a fraud-prevention adjustment.4Federal Reserve Board. Regulation II (Debit Card Interchange Fees and Routing) On a $50 purchase, that works out to roughly 24.5 cents at most. Smaller banks are exempt from the cap and average about 51 cents per transaction, compared with 23 cents at larger banks.5eCFR. 12 CFR Part 235 – Debit Card Interchange Fees and Routing (Regulation II) The Federal Reserve proposed lowering the cap further in 2023, but as of early 2026 the original structure is still in effect.
Selling You More Products
The checking account itself is often just the front door. Once you open one, the bank sees your paychecks, your bills, your spending patterns, and your cash flow. That data helps it market credit cards, home equity lines, auto loans, investment accounts, and insurance, all of which carry higher margins than a basic transaction account.
Banks formalize this through relationship pricing. Waived monthly fees for customers who keep combined balances above a threshold, a rate discount on a mortgage tied to automatic payments from your checking account, preferred rates on certificates of deposit for existing customers. The more products you hold in one place, the more inconvenient switching becomes, which is the point. Over years, the bank earns management fees on investments, advisory fees on wealth services, and interest on any credit you carry, with the checking account as the anchor.
What Federal Rules Limit
Two rules bound how banks can extract revenue from your account and are worth knowing.
The Truth in Savings Act, implemented through Regulation DD, requires banks to disclose the interest rate, annual percentage yield, and all fees before you open an account.6Office of the Law Revision Counsel. 12 USC Ch. 44 – Truth in Savings If the bank later raises a fee or cuts your rate, it must give you written notice at least 30 calendar days before the change takes effect.7eCFR. 12 CFR Part 1030 – Truth in Savings (Regulation DD) Banks also cannot advertise an account as “free” if it carries a regular maintenance fee or requires a minimum balance.
The Electronic Fund Transfer Act limits what you owe if someone runs unauthorized debit transactions on your account, and the cap depends on how fast you report it. Report within two business days and your liability is capped at $50. Wait longer than two business days but report within 60 days of receiving your statement and it can rise to $500. Beyond 60 days you can be on the hook for the full amount of unauthorized transactions occurring after that window.8Office of the Law Revision Counsel. 15 U.S. Code 1693g – Consumer Liability Reading your statements quickly is the cheapest form of fraud protection you have.