A bank account is a record the bank keeps of your money

When you open a bank account, you give the bank permission to hold your money and keep track of how much you have. The bank records every deposit you make, every withdrawal you take out, and every payment you send. That running total is your balance. The bank also charges you fees for certain services, and may pay you interest if your account earns it. Your account exists in the bank's system — you can see it online, on your phone, or on paper statements they mail to you.

The account itself is not a physical thing. It is a contract between you and the bank. You agree to follow their rules; they agree to safeguard your money and let you access it. The bank uses your money to make loans to other people and invest it, which is how they make profit. In return, they keep your account secure, process your transactions, and (in most cases) insure your deposits up to a legal limit.

Key Takeaways

  • A bank account is a record of your money held by a bank, tracked through deposits, withdrawals, and payments you make.
  • Your balance is the total amount in the account at any given moment, and it changes every time money moves in or out.
  • Banks charge fees for overdrafts, monthly maintenance, or other services, and may pay you interest if your account type earns it.
  • The Federal Deposit Insurance Corporation (FDIC) protects most bank accounts up to $250,000 per depositor, per bank, so your money is insured if the bank fails.

How money moves in and out of your account

Money enters your account through deposits. You can deposit a paycheck by direct deposit (your employer sends it straight to the bank), by mobile check deposit (you photograph a check and upload it through the bank's app), or by walking into a branch and handing cash or a check to a teller. The bank credits your account — adds the money to your balance — usually within one to three business days, depending on the deposit method.

Money leaves your account through withdrawals and payments. You can withdraw cash at an ATM or a teller window. You can pay bills by writing a check, setting up an automatic payment, or transferring money to another account. You can also spend money using a debit card linked to the account, which pulls the money directly from your balance. Each transaction reduces your balance by that amount.

The order in which transactions post to your account matters. If you have $500 and you make a $300 withdrawal and a $250 payment on the same day, the bank processes them in a specific order — usually largest to smallest, or in the order they received them. If the $250 payment posts first, you still have $250 left and the $300 withdrawal goes through. If the $300 withdrawal posts first, you only have $200 left, and the $250 payment bounces. That bounce triggers an overdraft fee, usually $25 to $35.

Types of accounts and what they cost

The two most common account types are checking and savings. A checking account is designed for frequent transactions — you can write checks, use a debit card, and set up automatic payments without limits. Most checking accounts charge a monthly maintenance fee, though many banks waive it if you keep a minimum balance or set up direct deposit. A savings account is designed to hold money and earn interest. You can make withdrawals, but there are usually limits on how many per month (though this rule has loosened in recent years). Savings accounts typically earn a small amount of interest — currently around 4% to 5% annually at online banks, much less at traditional banks.

Some banks offer money market accounts, which combine features of both: you can write checks and use a debit card, but you also earn interest. These accounts often require a higher minimum balance to avoid fees.

Fees vary by bank and account type. Common fees include monthly maintenance ($5 to $15), overdraft fees ($25 to $35 per transaction), ATM fees ($2 to $3 if you use an out-of-network machine), and wire transfer fees ($15 to $30). Some banks charge fees for paper statements or for closing an account early. Online banks typically charge fewer fees because they have lower overhead costs. Credit unions often charge lower fees than traditional banks and may offer better interest rates on savings.

How the bank protects your money

The FDIC (Federal Deposit Insurance Corporation) insures deposits at most banks up to $250,000 per depositor, per bank. This means if the bank fails, the FDIC will return your money up to that limit. The insurance covers checking accounts, savings accounts, money market accounts, and certificates of deposit (CDs). It does not cover investments like stocks or mutual funds, even if you buy them through the bank.

If you have more than $250,000, you can spread it across multiple banks to keep all of it insured. For example, $250,000 at Bank A and $250,000 at Bank B are both fully insured. Some account structures — like joint accounts or retirement accounts — have separate insurance limits, so a married couple can each insure $250,000 in a joint account, plus additional amounts in individual retirement accounts.

Beyond FDIC insurance, banks use encryption and fraud monitoring to protect your account from theft. If someone uses your debit card or account number without permission, federal law limits your liability. If you report the fraud within two business days, you are liable for no more than $50 of unauthorized charges. If you report it later, your liability can go up to $500. If you do not report it within 60 days of your statement, you may lose all protection.

What happens when you overdraw your account

An overdraft occurs when you try to withdraw or pay more money than you have in your account. The bank can either decline the transaction (you get a "non-sufficient funds" or NSF message) or allow it to go through and charge you an overdraft fee. Most banks allow overdrafts by default, which means you pay the fee but the transaction succeeds.

If you overdraw your account, you now owe the bank money. Your balance goes negative. The bank charges an overdraft fee (usually $25 to $35) for each transaction that overdrafts you. If you do not bring your balance back to zero within a set time — often 30 days — the bank may charge additional fees or close your account. Some banks report overdrafts to ChexSystems, a checking account history database, which can make it harder to open an account at another bank.

You can opt out of overdraft protection, which means the bank will decline transactions that would overdraft you instead of charging a fee. This prevents the fee but also means your card may be declined at the register. Some banks offer overdraft protection through a linked savings account or credit line — if you overdraw, the bank automatically transfers money from the other account to cover it, usually for a smaller fee than a traditional overdraft.

How to read your account statement

Your bank statement shows every transaction for a set period, usually one month. It lists deposits, withdrawals, checks, transfers, and fees. It shows the opening balance (what you had at the start of the period), the closing balance (what you have at the end), and all the activity in between. You can get statements by mail, email, or by logging into your online banking portal.

The statement also shows pending transactions — payments you have authorized but that have not yet posted to your account. A pending debit card charge might take one to three days to post. A pending check might take five to seven business days. Until a transaction posts, it does not affect your available balance, though many banks subtract pending transactions from the amount you can spend.

Review your statement regularly to catch fraud, errors, or unauthorized charges. If you see a transaction you did not make, contact the bank immediately. If the bank made an error — for example, posting a deposit twice or charging a fee twice — report it within 60 days of the statement date. The bank has 10 business days to investigate and either correct the error or explain why the transaction was correct.

How interest works on savings accounts

Interest is money the bank pays you for letting them use your money. The interest rate is expressed as an annual percentage yield (APY). If your savings account has a 4.5% APY and you have $1,000 in it for a full year with no deposits or withdrawals, the bank will pay you $45 in interest. That interest is added to your account, so your new balance is $1,045.

Interest compounds, which means you earn interest on your interest. If the bank compounds daily (the most common method), it calculates interest each day and adds it to your balance. The next day, you earn interest on the larger balance. Over time, this compounds into more money than if interest were calculated only once a year.

Interest rates vary widely by bank and change frequently. Online banks typically offer higher rates than traditional banks because they have lower costs. Rates also depend on the Federal Reserve's decisions about interest rates in the broader economy. When the Fed raises rates, savings account rates usually rise too. When the Fed lowers rates, savings account rates fall.

Frequently Asked Questions

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

A debit card pulls money directly from your bank account balance. A credit card borrows money from the card issuer, and you pay it back later (usually with interest if you do not pay the full balance). Debit cards do not build credit history; credit cards do. Debit cards offer less fraud protection than credit cards, though federal law still limits your liability.

Can the bank take money from my account without permission?

The bank can take money from your account if you owe them money (for overdrafts or unpaid fees) or if a court orders them to (for unpaid taxes or child support). They cannot take money for other debts, like credit card balances or medical bills. If you believe the bank took money in error, contact them within 60 days of the statement date.

What happens if I close my bank account?

You can close your account at any time by contacting the bank. If your account has a negative balance (you owe the bank money), you must pay it before closing. If the account has a positive balance, the bank will return your money by check or transfer it to another account. Some banks charge a fee for closing an account within a certain time frame (often six months to a year).

Is my money safe if I keep it in a bank account?

Your money is insured up to $250,000 by the FDIC if the bank fails. Your account is also protected from fraud by encryption and monitoring. However, the bank can charge fees that reduce your balance, and inflation can reduce the purchasing power of your money over time. Keeping money in a savings account that earns interest helps offset inflation slightly.

How do I know if a bank is FDIC-insured?

Most traditional banks are FDIC-insured, but not all. Credit unions are insured by the NCUA (National Credit Union Administration) instead, which offers the same $250,000 protection. You can search the FDIC's bank database on their website to confirm whether a specific bank is insured. Online banks are usually FDIC-insured through a partner bank.