An overdraft happens when you spend more money than you have in your account, and the bank covers the difference

When your account balance reaches zero and you make another purchase or withdrawal, you go into overdraft. The bank pays that transaction anyway, leaving your account with a negative balance. You now owe the bank money, not the other way around.

Think of it like borrowing from the bank when ready, except you did not ask for a loan and did not sign any paperwork. The bank straightforward let the transaction go through. This is different from a declined card — your payment succeeds, but your balance goes negative.

Not all banks handle overdrafts the same way. Some will refuse the transaction and charge you a fee for the attempt. Others will let it go through and charge you a fee for the overdraft itself. A few banks offer overdraft protection, which links your checking account to a savings account or credit line so money transfers automatically before you go negative.

Key Takeaways

  • An overdraft occurs when you spend more than your account balance and the bank covers the shortfall, putting your account into negative numbers.
  • Banks charge overdraft fees (typically $25 to $35 per transaction) when you overdraft, and may charge additional fees if your account stays negative.
  • You can prevent overdrafts by turning off overdraft protection, setting up account alerts, or linking a backup account through overdraft protection programs.
  • Some banks offer overdraft protection that automatically transfers money from savings or a credit line before your checking account goes negative.
  • Overdraft fees add up quickly if multiple transactions post while your account is negative, sometimes totaling hundreds of dollars in a single day.

How overdraft fees work and what they cost

When a transaction pushes your account negative, the bank charges you an overdraft fee. This is a separate charge on top of the negative balance itself. The fee amount varies by bank — most charge between $25 and $35 per overdraft transaction, though some charge more.

The cost adds up fast because each transaction that posts while you are negative triggers its own fee. If you overdraft on Monday with a $5 purchase, you might pay a $35 fee. If another transaction posts on Tuesday, that is another $35 fee. By the end of the week, you could owe $140 in fees alone, even though your original overspending was small.

Some banks also charge a sustained overdraft fee or extended overdraft fee if your account stays negative for several days. This is an additional charge, separate from the per-transaction fees. A few banks charge this fee daily or every few days until you bring your balance back to zero.

The difference between overdraft and declined transactions

When you try to spend money you do not have, one of two things happens. The bank either lets the transaction through (overdraft) or refuses it (declined).

A declined transaction means the bank said no. Your card does not work, the payment fails, and the money does not leave your account. You might still be charged a fee for the failed attempt — some banks charge $5 to $15 for a declined transaction — but your account does not go negative.

An overdraft means the bank said yes anyway. The transaction goes through, your account goes negative, and you pay a larger fee (usually $25 to $35). You now owe the bank the amount you overspent plus the overdraft fee.

Which one happens depends on your bank's policy and whether you have overdraft protection turned on. Banks are required to ask your permission before they start allowing overdrafts — this is called opting in to overdraft protection. If you have not opted in, most banks will decline the transaction instead.

Overdraft protection: automatic transfers that prevent negative balances

Overdraft protection is a service that automatically moves money into your checking account before it goes negative. Instead of paying an overdraft fee, the bank transfers funds from a linked account and charges you a smaller fee (or sometimes no fee at all).

The most common type links your checking account to your savings account at the same bank. When a transaction would overdraft your checking account, the bank automatically transfers money from savings to cover it. You pay a transfer fee (typically $10 or less, sometimes nothing) instead of a $35 overdraft fee.

Some banks offer overdraft protection through a credit line — a small loan account attached to your checking account. When you overdraft, the bank lends you the money instead of charging an overdraft fee. You pay interest on the borrowed amount, but the interest is often lower than the cost of overdraft fees.

Overdraft protection only works if you have money in the linked savings account or available credit on the credit line. If both are empty, your transaction will still be declined or overdraft fees will still explore.

Why banks allow overdrafts and how to turn it off

Banks allow overdrafts because they make money from the fees. A customer who overdrafts regularly can generate hundreds of dollars in fees per year. This is profitable for the bank, even though it costs the customer.

Federal law requires banks to get your permission before they start charging overdraft fees. When you open a checking account, the bank should ask whether you want overdraft protection turned on. Many people say yes without understanding what it means, or they do not realize they can change it later.

You can turn off overdraft protection at any time by contacting your bank. Call the customer service number on the back of your card, visit a branch, or log into your online banking and look for account settings. Once it is off, the bank will decline transactions that would overdraft your account instead of charging you a fee.

Turning it off does not hurt your credit score or your relationship with the bank. It straightforward means you cannot spend money you do not have — the transaction fails instead of going through.

Steps to avoid overdrafts and manage your balance

The simplest way to avoid overdrafts is to know your balance before you spend. Check your account on your phone or computer before making a purchase. Many banks show your balance when ready at the checkout or ATM.

Set up low balance alerts through your bank's app or website. You choose a dollar amount — say $100 — and the bank sends you a text or email when your balance drops below it. This gives you time to transfer money in or stop spending before you go negative.

Link a backup account through overdraft protection if you have one. If you have a savings account at the same bank, enable the automatic transfer feature. This costs less than overdraft fees and prevents your checking account from going negative.

Keep a small buffer in your account — money you do not plan to spend. Even $50 or $100 gives you room for unexpected charges or timing issues. Transactions do not always post when ready, so your available balance might be higher than your actual balance for a day or two.

What happens after you overdraft and how to recover

Once your account goes negative, you need to deposit money to bring it back to zero. The bank will not close your account or report you to credit agencies for a single overdraft, but they may close it if overdrafts happen repeatedly.

Deposit enough to cover both the negative balance and the overdraft fees. If you overdrafted by $20 and the fee was $35, you need to deposit at least $55. Some banks will refund one or two overdraft fees per year if you ask, especially if you have been a customer for a long time and this is your first overdraft.

Once your account is back to zero or positive, the overdraft is resolved. It does not appear on your credit report and does not affect your credit score. However, your bank may report the overdraft to ChexSystems, a banking history database that other banks check when you try to open a new account. Too many overdrafts can make it harder to open accounts at other banks.

Frequently Asked Questions

Can I overdraft my account at an ATM?

Yes, if overdraft protection is turned on. You can withdraw more cash than your balance allows, and your account will go negative. The bank charges an overdraft fee just like any other transaction. Some ATMs will refuse the withdrawal if your balance is too low, but this depends on your bank.

Does overdrafting hurt my credit score?

A single overdraft does not appear on your credit report and does not hurt your credit score. However, if your account stays negative for a long time and the bank sends it to a collection agency, that can damage your credit. Overdrafts also appear in ChexSystems, which other banks see when you try to open new accounts.

What if I cannot pay back the overdraft?

Contact your bank and explain the situation. Some banks will work with you to set up a payment plan or waive fees if you are in hardship. If you do not pay, the bank may close your account and report the debt. This makes it very difficult to open a checking account elsewhere.

Is overdraft protection the same as a line of credit?

Overdraft protection can be linked to a line of credit, but they are not the same thing. Overdraft protection is a service that prevents your account from going negative. A line of credit is borrowed money you pay interest on. Some overdraft protection uses a line of credit; other types use a linked savings account.

Why did my bank charge me multiple overdraft fees in one day?

Each transaction that posts while your account is negative triggers its own overdraft fee. If several purchases or bills post on the same day, you can be charged multiple fees at once. This is why overdraft fees add up so quickly — not because of one big mistake, but because of several small transactions hitting a negative balance.