Banks are institutions that hold your money, lend it out, and process payments between accounts

A bank is a business licensed by the government to take deposits, make loans, and move money. When you put money in a checking account, the bank holds it. When you write a check or use a debit card, the bank moves that money to someone else's account. When you borrow money, the bank lends from deposits it holds and charges you interest. The bank makes money on the difference between what it pays you (or nothing, on many accounts) and what it charges borrowers.

Banks are not the only institutions that move money—credit unions, payment apps, and money transfer services do too—but banks are the oldest and most heavily regulated. Every bank in the United States is insured by the Federal Deposit Insurance Corporation (FDIC), which means if the bank fails, the government guarantees your deposits up to $250,000 per account type per institution.

Key Takeaways

  • Banks hold deposits, process payments, and make loans; they are licensed and regulated by federal and state governments.
  • The FDIC insures deposits up to $250,000 per account type, so your money is protected if the bank fails.
  • When you send money through a bank, it travels through a network of clearing houses and other banks, which is why transfers take time.
  • Banks charge fees for services like overdrafts, wire transfers, and account maintenance, though many offer free checking accounts.
  • Credit unions and online banks operate differently from traditional banks but serve similar functions and are also insured.

How banks process payments and move money between accounts

When you send money from your bank account to someone else's, the payment does not move directly. Instead, it travels through a series of intermediaries. If you write a check, the recipient deposits it at their bank. That bank sends the check to a clearing house—a central facility that matches checks from one bank against deposits at another. The clearing house deducts the amount from your bank's account and adds it to the recipient's bank's account. Your bank then deducts the amount from your account.

Electronic payments work similarly but faster. When you use a debit card, the merchant's bank sends a request through a payment network (Visa, Mastercard, or a bank-owned network) to your bank. Your bank approves or declines the transaction in seconds. The money settles—actually moves—within one to three business days. Wire transfers skip the clearing house and move directly between banks, which is why they are faster but also why they cannot be reversed once sent.

ACH transfers (Automated Clearing House) are the slowest but cheapest way to move money electronically. They batch thousands of transactions and process them once or twice a day. A typical ACH transfer takes three to five business days because the clearing house waits to collect enough transactions to make a batch economical.

The difference between commercial banks, credit unions, and online banks

Commercial banks are for-profit institutions owned by shareholders. They have physical branches, employ tellers and loan officers, and offer a full range of services: checking, savings, loans, credit cards, investment accounts. They are regulated by the Office of the Comptroller of the Currency (OCC) if they have a national charter, or by state banking regulators if they have a state charter. All are insured by the FDIC.

Credit unions are nonprofit cooperatives owned by their members. You must meet membership criteria—working for a certain employer, living in a certain area, or belonging to a certain organization—to join. Credit unions typically offer lower fees and better interest rates on savings because they do not pay shareholders. They are insured by the National Credit Union Administration (NCUA), which works the same way as the FDIC. Credit unions are regulated less strictly than banks and have fewer branches, but they can access the same payment networks.

Online banks are commercial banks with no physical branches. They offer checking and savings accounts, sometimes loans, but you manage everything through a website or app. They have lower overhead costs than branch banks, so they often pay higher interest on savings and charge fewer fees. They are still FDIC-insured and regulated the same way as traditional banks.

What banks charge and what services cost

Banks make money from interest on loans and from fees on accounts and services. A monthly maintenance fee is charged on some checking accounts, though many banks waive it if you maintain a minimum balance or set up direct deposit. An overdraft fee is charged when you spend more than your balance; the amount varies but is typically $25 to $35 per overdraft. Some banks charge multiple overdraft fees in a single day.

A wire transfer fee ranges from $15 to $50 depending on whether it is domestic or international. An ATM fee is charged when you withdraw cash from an ATM not owned by your bank, usually $2 to $3. A foreign transaction fee is charged when you use a debit card abroad, typically 1 to 3 percent of the purchase. Many banks offer accounts with no monthly fee and no overdraft fees, though these accounts may have other restrictions like a maximum number of withdrawals per month.

How the Federal Reserve and regulators oversee banks

The Federal Reserve is the central bank of the United States. It does not take deposits from individuals, but it holds accounts for other banks and the government. The Fed sets the discount rate—the interest rate it charges banks to borrow overnight—which influences the interest rates banks charge each other and, eventually, the rates they offer to you. The Fed also sets reserve requirements, which determine how much cash a bank must keep on hand versus how much it can lend out.

Banks are regulated by multiple agencies depending on their charter and size. The OCC oversees nationally chartered banks. State banking regulators oversee state-chartered banks. The Federal Reserve oversees bank holding companies and state-chartered banks that are members of the Federal Reserve System. The FDIC insures deposits and can take over a failing bank. The Consumer Financial Protection Bureau (CFPB) enforces consumer protection laws and investigates complaints about unfair or deceptive practices.

Why banks take time to process payments

A payment that appears to clear when ready on your phone may not actually settle for days. When you send an ACH transfer on a Friday evening, it does not process until Monday because the clearing house does not operate on weekends. Even on business days, the clearing house batches transactions and processes them at set times—usually early morning and mid-afternoon. A transfer initiated at 3 p.m. may not enter the batch until the next morning.

Debit card transactions are faster because the merchant's bank gets a response within seconds, but the money does not actually move for one to three days. During that time, both your bank and the merchant's bank are holding the money in a suspense account. Wire transfers are faster because they bypass the clearing house, but they still require manual verification at each bank, which is why they take a few hours rather than minutes.

Banks are required by law to make funds from checks and electronic deposits available within a certain time frame, but that does not mean the payment has settled. The Expedited Funds Availability Act requires banks to make most deposits available within one to two business days, but the actual clearing can take longer. If a check bounces after the bank has made the funds available to you, the bank can reverse the deposit and charge you a fee.

What happens when a bank fails

If a bank becomes insolvent—unable to pay its obligations—the FDIC takes control. The FDIC does not bail out the bank; instead, it pays depositors up to $250,000 per account type per institution from the Deposit Insurance Fund. Account types are separate: a checking account, a savings account, and a money market account at the same bank are each insured up to $250,000. Joint accounts are insured separately, so a joint checking account is insured up to $250,000 in addition to your individual accounts.

When the FDIC takes over a bank, it usually arranges for another bank to buy the failed bank's deposits and branches. Depositors wake up to find their accounts transferred to the new bank, and they can access their money when ready. If no buyer is found, the FDIC pays depositors directly, which can take weeks. Amounts over $250,000 are treated as claims against the failed bank's assets and may recover pennies on the dollar, or nothing.

Frequently Asked Questions

Is my money safe in a bank?

Your deposits are insured by the FDIC up to $250,000 per account type per institution. If the bank fails, the FDIC pays you. If you have more than $250,000, keep the excess at a different bank or in a credit union (insured by the NCUA) to may support full coverage.

Why does a transfer take three to five days?

ACH transfers batch thousands of transactions and process them once or twice daily. The clearing house waits to collect enough transactions to make processing economical. Wire transfers are faster because they move directly between banks, but they still take a few hours for verification.

Can a bank freeze my account?

Yes. Banks can freeze accounts if they suspect fraud, if you owe money to the bank, or if they receive a court order. If your account is frozen, contact the bank when ready to find out why and what you need to do to unfreeze it.

What is the difference between a debit card and a credit card?

A debit card draws money directly from your bank account. A credit card borrows money from the card issuer, and you pay it back later with interest. Debit cards offer less fraud protection than credit cards, but they do not let you spend money you do not have.

Do I need a bank account?

No, but it is difficult to function without one in the modern economy. Most employers require direct deposit, most landlords require a check or bank transfer for rent, and most utilities require a bank account for payment. Some people use prepaid cards or check-cashing services, but these are more expensive than a basic bank account.