An overdraft happens when your bank pays a transaction that your checking account doesn’t have the money to cover, creating a negative balance you owe back. So how does overdraft work in practice? The bank advances the shortfall, usually charges a fee (industry average around $27 per transaction as of early 2025, though several large banks have cut it or dropped it entirely), and expects you to bring the balance back to zero. Federal rules give you a direct say in whether the bank can do this on debit card and ATM transactions at all, so the cost you actually pay depends heavily on choices you’ve already made — or can still make today.
What Pushes an Account Into Overdraft
Two categories of transactions behave differently, and the distinction matters.
Paper checks and recurring ACH transfers — utilities, insurance, subscriptions — arrive at your bank and get paid or returned. If your balance is too low, the bank chooses: pay the item and charge you an overdraft fee, or send it back unpaid and charge you a non-sufficient funds (NSF) fee. Either way, a fee is possible, and you don’t get asked first.
One-time debit card purchases and ATM withdrawals work in real time. The merchant or machine asks your bank to approve a specific amount. Your bank either approves it (creating a negative balance) or declines it on the spot. Federal rules covered below let you decide which of those two outcomes your bank uses.
Authorization Holds Can Overdraw You by Surprise
Some merchants place a temporary hold that’s larger than the final charge. Gas stations commonly hold $50 to $150 before you pump. Hotels may hold $50 to $200 at check-in. Car rental companies can hold several hundred dollars. That money is tied up in your account even though the actual charge is often much smaller. If other transactions hit while a large hold is active, your available balance may look short, and you can be charged overdraft fees on transactions you actually had enough money for once the hold settled.
What Overdrafts Cost
The industry average is roughly $27 per transaction, but the range is wide. Capital One, Citibank, Ally Bank, and Discover charge no overdraft fees at all. Bank of America charges $10 per incident with a cap of two fees per day. Many smaller institutions still charge $25 to $36. Where you bank is the biggest single factor in what an overdraft actually costs you.
Small-Amount Waivers and Grace Periods
Many banks now waive the fee when the account goes negative by only a small amount. These “de minimis” thresholds vary but typically fall between $5 and $50. Separately, a growing number of banks give you a grace period — often 24 hours or until the end of the next business day — to bring the balance back to zero before charging anything. Both rules are set by each bank individually, so it’s worth checking your own institution’s policy.
Daily Fees After the First One
If the account stays negative for several consecutive days, some banks add a daily extended overdraft fee, often $5 to $10. These can pile up quickly and sometimes exceed the original transaction amount within a week or two. Not every bank charges them; those that do disclose the terms in your account agreement.
NSF Fees and Returned-Check Fees
When the bank returns a transaction unpaid rather than covering it, you may be hit with an NSF fee instead. The payment fails, and you still owe the fee. Many large banks have eliminated NSF fees, but they remain common at smaller institutions. On top of that, the merchant or payee whose payment bounced can charge you a returned-check fee, generally $20 to $40 depending on state law.
Your Right to Opt Out of Debit and ATM Overdrafts
This is the single most important rule to know. Under Regulation E, your bank cannot charge you for covering a one-time debit card purchase or ATM withdrawal unless you have specifically opted in to overdraft service for those transactions. Without your affirmative consent, the bank has to decline the transaction at no charge.1eCFR. 12 CFR 1005.17 – Requirements for Overdraft Services
Before you can opt in, the bank has to give you a separate written notice describing how the service works, the fee amounts (including any daily fees), and your right to decline. If the fee varies with how often or how much you overdraw, the notice has to disclose the maximum. Silence or inaction is not consent — you have to actively agree.1eCFR. 12 CFR 1005.17 – Requirements for Overdraft Services
You can revoke your opt-in at any time using the same channel you used to enroll (online, phone, or in person). Once you revoke, the bank has to stop charging overdraft fees on debit and ATM transactions as soon as reasonably practicable, though it doesn’t have to reverse fees already assessed.2Consumer Financial Protection Bureau. Section 1005.17 Requirements for Overdraft Services
Two boundaries to know. First, this opt-in rule does not cover checks or recurring ACH payments. Your bank can pay or return those and charge a fee either way, regardless of your opt-in choice. It also cannot punish you for opting out by refusing to pay your checks or ACH transfers.1eCFR. 12 CFR 1005.17 – Requirements for Overdraft Services Second, the protection only applies to consumer accounts. Business or commercial checking accounts get no opt-in right.3eCFR. 12 CFR Part 1005 – Electronic Fund Transfers (Regulation E)
Two Situations That Cause Unexpected Overdrafts
The Order Your Bank Processes Transactions
The order in which your bank runs the day’s transactions can change how many fees you pay. Under a high-to-low method, the largest transactions clear first. If a $1,500 mortgage payment clears before five $20 purchases, the mortgage drains the balance immediately and each of the small purchases triggers a separate fee. Processed chronologically, only the mortgage would have overdrawn the account. Other banks use end-of-day batching with their own internal logic. Your account agreement discloses which method your bank uses; if you can’t find it, call and ask.
Holds on Deposited Checks
A deposited check isn’t always available immediately. Regulation CC sets maximum hold times. For most checks deposited at your own bank, funds must be available by the second business day. At an ATM not owned by your bank, the hold can run up to five business days.4Federal Reserve. A Guide to Regulation CC Compliance
Longer holds are permitted in some cases: deposits over $6,725 (the excess can be held longer), new accounts under 30 days old, redeposited checks, and checks the bank has reasonable cause to believe are uncollectible. Spending against a check that’s still on hold can trigger overdraft fees even when you thought the money was there.
One protection worth knowing: if your bank extends a hold because it suspects a check is uncollectible, doesn’t tell you about the hold at deposit, and the check ultimately clears, the bank cannot charge you overdraft or NSF fees that resulted solely from that extended hold.5eCFR. 12 CFR Part 229 – Availability of Funds and Collection of Checks (Regulation CC)
Cheaper Ways to Handle the Same Problem
Link a backup account. Most banks let you link a savings account, money market, or second checking account. When a transaction would overdraw checking, the bank pulls the exact shortfall from the linked account before charging an overdraft fee. Bank of America, Capital One, and Citibank charge nothing for the transfer; some smaller banks charge a transfer fee, but it’s typically well below a standard overdraft fee. Watch the frequency of savings transfers, which can push you past federal limits on certain savings withdrawals.
Open an overdraft line of credit. Some banks offer a small credit line specifically for overdrafts. Instead of a flat fee, you pay interest on the amount borrowed, which for small shortfalls repaid quickly usually costs less than a $27 fee. You typically have to apply and be approved separately.
Switch banks. If overdraft fees are recurring, moving to a bank that doesn’t charge them may be the cheapest fix. Capital One, Ally Bank, Citibank, and Discover charge no overdraft fees at all. Some digital platforms offer small no-fee overdraft cushions of $50 to $200, usually conditioned on regular direct deposits.
What Happens If You Leave the Balance Negative
Ignoring a negative balance turns a fee problem into a banking-access problem. If you don’t bring the account back to zero, the bank will eventually close it involuntarily and report the unpaid balance to specialty consumer reporting agencies like ChexSystems or Early Warning Services. That record stays on file for five years from the date of closure.6ChexSystems. ChexSystems Frequently Asked Questions
A ChexSystems record can make it hard to open a new checking or savings account, because most banks screen new applicants through these agencies. Some will require you to pay off the old balance before approving a new account.7Consumer Financial Protection Bureau. Denied for a Bank Account? Here’s What You Should Know
Your traditional credit report can also take a hit. Checking activity itself doesn’t usually appear on Experian, Equifax, or TransUnion reports, but banks often sell unpaid negative balances to debt collectors, who can then report the debt as a collections item and drag down your credit score.8Consumer Financial Protection Bureau. Will It Hurt My Credit if My Bank or Credit Union Closed My Checking Account
If a ChexSystems or Early Warning Services report contains something you already paid or otherwise disputes reality, you have the right to challenge it directly with the reporting agency and with the bank that supplied the information.7Consumer Financial Protection Bureau. Denied for a Bank Account? Here’s What You Should Know