What Happens If You Overdraft Your Checking Account?

By Derek Holt · Last checked October 22, 2026

The short version

An overdraft is when you do not have enough money in your account to cover a transaction, but the bank pays it anyway. That is the CFPB’s definition. Two things follow: your balance goes negative, and you usually owe a fee as well as the amount you went over.

Whether you can be charged that fee depends on how you spent the money. For ATM withdrawals and one-time debit card purchases, the bank needs your permission first. For checks and automatic payments, it does not.

What happens, step by step

When a transaction comes in for more than you have, the bank has a choice.

1. It pays the transaction. Your account goes below zero. The CFPB says banks with overdraft programs generally charge a fee for this, on top of requiring you to repay the overdraft amount.
2. It declines or returns the transaction. A debit card purchase is declined at the register. A check or automatic payment can be returned unpaid. The CFPB says a returned item can still cost you a non-sufficient funds (NSF) fee from the bank, often the same amount as an overdraft fee, and the merchant may add a returned item fee of its own.

The CFPB lists the ways you can overdraw: checks, ATM transactions, debit card purchases, automatic bill payments, and electronic or in-person withdrawals.

The debit card and ATM opt-in rule

This is the part most new account holders do not know about.

Under Regulation E, at 12 CFR 1005.17, a bank cannot charge an overdraft fee for paying an ATM withdrawal or a one-time debit card purchase unless it has:

• given you a written or electronic notice describing its overdraft service,
• given you a reasonable chance to opt in,
• received your affirmative consent, and
• sent you a confirmation that includes your right to revoke that consent.

The CFPB calls this an opt-in system, not an opt-out one. If you never said yes, you are not enrolled. The CFPB’s official interpretation says the opt-in covers one-time debit card purchases at a register, online, or by phone.

Here is what the rule does and does not cover.

The CFPB’s Circular 2024-05 confirms these rules do not apply to overdraft fees on checks, recurring debit transactions, or ACH transactions. Some banks let you opt out of overdrafts on those too, the CFPB says, though you may then face an NSF fee instead.

Two more details from the rule:

• A bank can pay without your opt-in, but cannot charge for it. If a bank pays a debit or ATM overdraft without your consent, it may not charge a fee. It can still take the overdrawn amount back from your account.
• Opting in does not guarantee approval. The CFPB says that even if you opted in, the bank can still decline a debit purchase that would overdraw your account.

You can change your mind any time

The rule gives you a continuing right to opt in or revoke. You can revoke consent at any time, using the same methods the bank offered for opting in, and the bank must act on it as soon as reasonably practicable. Your consent lasts until you revoke it or the bank ends the service.

If the account is joint, the rule treats an opt-in or a revocation by any one account holder as applying to the whole account.

Revoking does not undo the past. The OCC says it does not require the bank to reverse fees already charged, but it does prevent future fees on one-time debit card overdrafts.

Why the fees can stack up

A single bad day can produce more than one fee. Here is why, according to federal regulators.

• Posting order is not purchase order. The OCC says transactions do not necessarily post in the order you made them. The bank’s posting policy is in your account agreement.
• Deposits are not always available right away. The OCC says banks do not have to make deposited funds available immediately, and a deposit made after a cutoff time may count as made the next business day. The CFPB warns you can overdraw even after you just made a deposit.
• Daily limits vary. The CFPB says some banks set their own maximum number of overdrafts per day. The opt-in notice under the rule must state that maximum, or say there is no limit.
• Bounced checks can come back. The OCC says a bank may try to deposit an NSF check two or three times, no law sets the number, and a fee can be charged each time.
• No one has to warn you. The OCC says a bank is not required to notify you when a check bounces for insufficient funds.

Federal law does not set a maximum overdraft fee, the OCC says. Your bank’s fee schedule is the only place to find the actual number.

Cheaper ways to cover a shortfall

The CFPB describes alternatives to a standard overdraft program:

The CFPB also notes that many banks and mobile banking companies are reducing or eliminating overdraft fees. Ask about a specific account’s terms before you open it.

Worked example

This is an illustration, not a real person or bank. Rosalind has $40 in checking. On Thursday she buys $55 of groceries with her debit card. That night, a $15 streaming subscription charges the same card as a recurring payment.

• If she never opted in: The grocery purchase is a one-time debit card transaction, so the bank cannot charge an overdraft fee for paying it. The bank may decline it at the register instead. The subscription is a recurring debit payment, so the opt-in rule does not protect it, and her account terms decide whether it is paid with a fee, returned with an NSF fee, or declined.
• If she opted in when she opened the account: The bank can pay the groceries and charge its overdraft fee, or still decline them. The subscription then hits an account that is already negative, which may mean a second fee, depending on the bank’s per-day limit.

Rosalind calls her bank, asks whether she is opted in, revokes debit overdraft coverage, and links her savings account for transfers. Then she sets a low-balance alert.

Checklist for a new checking account

• [ ] Ask whether you are opted in to overdraft for debit and ATM transactions. Revoke it if you do not want it.
• [ ] Find the overdraft fee, the NSF fee, and the daily maximum in the fee schedule.
• [ ] Read the posting order section of your account agreement.
• [ ] Ask what a linked savings transfer costs.
• [ ] Turn on low-balance alerts if your bank offers them. The CFPB says they can warn you before you overdraw.
• [ ] Write down the dates and amounts of your automatic payments, as the CFPB suggests, so payday lands before they do.

If you are already overdrawn

Bring the balance back above zero as soon as you can, since you owe the amount you went over. Then call the bank. Ask whether you are opted in, and ask whether it will waive the fee. Nothing in federal law requires it to, so treat it as a request.

If you were charged a debit card overdraft fee and do not believe you opted in, the CFPB says you may file a complaint with it. Its Circular 2024-05 says a bank can violate federal law if it has no proof that it obtained your consent.

Related reading

Build a buffer so this happens less often with a budget for your first paycheck. Before you move money into an app to avoid fees, check whether that money is FDIC insured.