Banks make money from checking accounts in four main ways: they lend your deposits out at interest rates far higher than what they pay you, they charge account fees, they collect interchange fees from merchants every time you swipe your debit card, and they use the account as a foothold to sell you other financial products. The spread between what the bank earns on your money and what it pays you for it is the single largest driver. The national average interest rate on a checking account sits around 0.07%, while the same dollars go back out as mortgages, car loans, and business credit at multiples of that rate.
Lending Out Your Deposits
Your balance does not sit in a vault with your name on it. The bank pools it with every other depositor’s money and lends most of it out. Since March 2020, the Federal Reserve has set the reserve requirement at zero percent for all depository institutions, so banks are not legally required to hold back any specific fraction of your deposit.1Board of Governors of the Federal Reserve System. Reserve Requirements They keep cash on hand to cover daily withdrawals, but how much of your deposit goes into interest-earning assets is largely their call.
The profit comes from what bankers call the net interest margin: the gap between the near-zero rate they pay you and the much higher rate they charge borrowers. The average 30-year fixed mortgage rate was about 5.98% as of late February 2026, and personal loan rates can run considerably higher.2Freddie Mac. Mortgage Rates Earning roughly 6% on a mortgage while paying you a fraction of a percent on the deposit funding it generates steady income as long as the bank manages lending risk and keeps deposits flowing in.
There is a smaller side benefit called float. When a check is deposited, there is a brief window before the funds actually settle with the paying bank. Federal rules under Regulation CC cap how long a bank can hold your deposit (the first $225 of most check deposits must be available the next business day), but even short delays multiplied across millions of transactions let the bank earn overnight interest on money in transit.3eCFR. 12 CFR Part 229 – Availability of Funds and Collection of Checks (Regulation CC)
Fees You Pay Directly
Direct fees are the second large revenue stream, and they are the one you can see on your statement. The common categories:
- Monthly maintenance fees typically run $5 to $15 unless you meet conditions like a minimum balance or a recurring direct deposit.
- Overdraft and nonsufficient-funds fees average around $35 per occurrence when a transaction exceeds your available balance. Some large banks have voluntarily cut or eliminated them in recent years, but the charge remains common across the industry.
- Out-of-network ATM fees usually run $2 to $5 per withdrawal, sometimes charged by both your bank and the ATM operator.
- Inactivity or dormancy fees kick in if you stop using the account for an extended period. After two to five years of inactivity, depending on your state, unclaimed funds may be turned over to the state through escheatment.
Together these fees generate billions in annual revenue for the industry. Overdraft fees in particular have long been among the most profitable line items on a bank’s income statement, though regulatory and competitive pressure has pushed some institutions toward lower-cost alternatives.
Interchange Fees on Your Debit Card
Every time you swipe your debit card, the merchant pays a small interchange fee to your bank to process the transaction. You never see it on your statement because it comes out of the merchant’s revenue, not yours. Spread across billions of transactions a year, it adds up to a serious income source.
The size of the fee depends on how big your bank is. Under the Durbin Amendment to the Dodd-Frank Act, banks with more than $10 billion in assets face a cap: no more than 21 cents plus 0.05% of the transaction value, with an additional 1 cent allowed for banks that qualify for a fraud-prevention adjustment.4Federal Reserve Board. Regulation II (Debit Card Interchange Fees and Routing) On a $50 purchase, that works out to a maximum of roughly 24.5 cents. Smaller banks are exempt from the cap and average about 51 cents per transaction, compared to about 23 cents at the capped institutions.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 remains in effect.
Selling You Other Products
The checking account is often just the front door. Once you open one, the bank can see your income, your spending patterns, and your cash flow. That data helps it market higher-margin products: credit cards, home equity lines, auto loans, investment accounts, and insurance. The checking account itself may bring in modest revenue, but it anchors you as a customer for everything else.
Many banks formalize this through relationship pricing. Common incentives include waived monthly fees when your combined balances across accounts hit a threshold, reduced interest rates on mortgages or home equity loans tied to automatic payment from a checking account, and preferred rates on certificates of deposit. The more accounts and products you hold at one institution, the harder it becomes to leave. That is the point. Over time the bank earns management fees on investment accounts, advisory fees on wealth services, and interest on any credit products you carry, all seeded by the original checking relationship.
What This Means for You
Knowing where the money comes from tells you where to push back. Three practical points.
First, you are entitled to clear fee disclosure before you open the account. The Truth in Savings Act, implemented through Regulation DD, requires the bank to disclose the interest rate, annual percentage yield, and all fees up front.6Office of the Law Revision Counsel. 12 USC Ch. 44 – Truth in Savings If the bank later wants to raise a fee or cut your rate, it must give you written notice at least 30 calendar days before the change takes effect, and it cannot advertise an account as “free” if it carries regular maintenance fees or a minimum balance requirement.7eCFR. 12 CFR Part 1030 – Truth in Savings (Regulation DD)
Second, watch your statements. The Electronic Fund Transfer Act caps your liability for unauthorized debit card charges, but only if you report quickly. Reporting within two business days keeps your maximum loss at $50. Between two business days and 60 days after your statement arrives, your liability can rise to $500. After 60 days, you can be on the hook for the full amount of unauthorized charges made beyond that window.8Office of the Law Revision Counsel. 15 U.S. Code 1693g – Consumer Liability
Third, your banking history affects how much the next bank can charge you. Before opening an account, most banks pull a report from a specialty consumer reporting agency such as ChexSystems or Early Warning Services, which track past overdrafts, bounced checks, and involuntarily closed accounts.9Consumer Financial Protection Bureau. Why Was I Denied a Checking Account? A negative record can push you into a “second chance” account with higher fees, or lead to an outright denial. Because these reports fall under the Fair Credit Reporting Act, you can request a free copy annually and dispute inaccurate items; if the agency cannot verify a disputed entry, it has to be corrected or removed. Keeping that record clean is what preserves your ability to shop for the account with the lowest fees, which is the one way you directly reduce what the bank earns off you.