Overdraft

An overdraft is what happens when a financial institution pays a transaction presented against an account that does not have enough available funds to cover it, so the balance goes below zero. In consumer banking the word is used for both the event and the charge that follows it. Regulation E defines the service at 12 CFR 1005.17(a): an overdraft service is one under which an institution assesses a fee for paying a transaction, "including a check or other item," when the consumer has insufficient or unavailable funds.

That definition carries four express exclusions, and they mark the boundary between this page and the arrangements sold as overdraft protection. Paying an overdraft out of a line of credit subject to Regulation Z, including an overdraft line of credit, is not an overdraft service under this rule. Neither is a service that transfers funds from another account the consumer holds, such as a savings account. So an account can go negative in several mechanically different ways, and only the discretionary version, where the bank simply pays the item and charges a fee, is what the rules below govern.

Two events also need separating, because the vocabulary blurs them and the consequences differ. If the bank pays the item and lets the balance go negative, that is an overdraft. If it refuses the item and returns it unpaid, that is a non-sufficient-funds event, and the payee who was expecting the money may add a returned-payment or late fee of their own under whatever agreement you have with them. The returned version can therefore cost twice and can also breach a contract, which is why a bounced rent or insurance payment is a worse event than its bank fee alone suggests.

The opt-in rule is narrower than almost every summary of it, and this is the most consequential thing on the page. 12 CFR 1005.17(b)(1) says an institution may not charge a fee for paying an ATM or one-time debit card transaction under its overdraft service unless it has first given a segregated written notice describing the service, provided a reasonable opportunity to consent, obtained affirmative consent, and confirmed that consent in writing along with a statement of the right to revoke it. Four steps, and all four apply to two transaction types.

The Official Interpretations to that section say twice, in terms, that the rule "does not prohibit" a fee where the negative balance is attributable in whole or in part to a check, an ACH debit, or another transaction type. So a household that declines coverage is still fully exposed on rent, a mortgage payment, an insurance premium, a utility auto-pay, and any other recurring debit. Declining is still worth doing, because it converts a small discretionary card purchase into a declined card rather than a fee. It is simply not the whole answer, and the standard advice is usually given as though it were.

Two protections attach to the choice, and they are easy to miss. Under 1005.17(b)(2) an institution may not condition its payment of overdrafts on checks, ACH transactions, and other transaction types on your consenting to coverage for ATM and one-time debit card transactions, and may not decline those other items because you have not consented. Under 1005.17(b)(3) it must give consumers who decline the same account terms, conditions, and features it gives consumers who consent, except for the card coverage itself. Together those mean declining cannot lawfully be punished with a worse account.

Consent behaves unusually on a joint account. 1005.17(e) provides that where two or more consumers hold an account jointly, the institution treats the affirmative consent of any of them as consent for the account, and likewise treats a revocation by any of them as revocation for the account. One holder can therefore turn the coverage on, or off, for both. And under 1005.17(f) and (g) the choice is not permanent in either direction: a consumer may consent or revoke at any time in the manner the notice describes, the institution must implement a revocation as soon as reasonably practicable, and consent otherwise runs until revoked.

One disclosure requirement in the notice is worth reading before you sign anything. 1005.17(d)(2) requires the notice to state the dollar amount of the fees, including any daily fees, and where the amount varies, the maximum that may be imposed. 1005.17(d)(3) then requires the maximum number of overdraft fees that may be assessed per day, "or, if applicable, that there is no limit." A regulation that has to provide for the possibility of no daily limit is telling you something about the range of practice.

Where the fees are disclosed is not where people look, and the useful figure is already computed. Overdraft fees are a deposit-account disclosure rather than an electronic-transfer one. Regulation DD at 12 CFR 1030.11(a) requires the periodic statement to disclose separately the total dollar amount of all fees imposed for paying items into a negative balance, under the prescribed heading "Total Overdraft Fees," and separately the total for returning items unpaid, and to give both figures for the statement period and for the calendar year to date. Regulation DD reaches banks and savings institutions rather than credit unions, which 12 CFR 1030.1(c) excludes; the National Credit Union Administration's parallel Truth in Savings rule imposes the same requirement in the same words at 12 CFR 707.11(a), including the same heading. So the question "how much did this cost me last year" does not require adding anything up wherever you bank. It is on the statement.

The balance the bank uses is not always the balance you see, and one rule narrows the gap. Institutions post against an available balance that can exclude deposits still in the process of clearing and can include holds placed by card authorizations, so a transaction can overdraw an account that looks funded. A card authorization approved against a positive available balance can also settle days later, after other items have posted, against a negative one. Regulation DD at 12 CFR 1030.11(c) addresses one half of this: where an institution discloses a balance through an automated system such as an app, an ATM, or a telephone line, that balance may not include amounts the institution might advance to cover an item, whether under a discretionary service, a credit line, or a transfer from another account. It may show a second, larger balance only if it prominently says that the figure includes those amounts.

The status of the federal rule most guidance still describes as coming. The Consumer Financial Protection Bureau finalized a rule in December 2024 addressing overdraft lending at very large institutions, with an effective date of 1 October 2025. It never took effect. Congress passed a joint resolution of disapproval under the Congressional Review Act, signed into law as Public Law 119-10 on 9 May 2025, whose operative words are that Congress "disapproves" the rule and that the rule "shall have no force or effect." Because that happened five months before the effective date, no part of it ever applied. The precise verb matters: this was not a repeal, since nothing had taken effect to repeal, and not a vacatur, which is something a court does. It also closes the route more firmly than a court order would, because 5 USC 801(b)(2) provides that a rule disapproved this way "may not be reissued in substantially the same form" and that a substantially similar rule may not be issued, unless specifically authorized by a law enacted afterwards. Treat current pricing as the operative reality rather than as something about to change.

The bank compares each incoming item against your available balance. If the balance covers it, the item posts. If it does not, the bank either pays the item and charges an overdraft fee, refuses it and charges a returned-item fee, or covers it from an arrangement you set up in advance, such as a transfer from savings or an overdraft line of credit. Which of the three happens depends on the account agreement, on the transaction type, and on choices you can usually change. Fees are typically assessed per item rather than per day, which is why the number of items presented matters as much as the size of the shortfall.

A hypothetical example. The fee below is an assumption used to make the arithmetic checkable; institutions set and disclose their own.

Marcus has $120 available. On Wednesday three things reach his bank: a car insurance premium of $142 collected by automatic debit, a utility payment of $63 on the same rail, and a $9 debit card purchase at a coffee shop. Marcus has not consented to coverage for ATM and one-time debit card transactions.

The $9 card purchase is declined and costs him nothing. Declining coverage is what bars the fee; the decline is the bank's ordinary response once it cannot charge for paying the item. The two automatic debits fall outside the opt-in rule entirely, and the bank pays both. They total $205, which exceeds his balance by $85 ($205 − $120). Two items were paid into a negative balance, so at an assumed $34 per item the fees are $68 ($34 × 2), and the account finishes at −$153 ($120 − $205 − $68).

Two things are worth noticing in that arithmetic. The $68 of fees is 80% of the $85 shortfall that caused them ($68 ÷ $85), which is the sense in which an overdraft is expensive short-term credit rather than a penalty. And the protection Marcus had chosen applied only to the $9 purchase, while the $205 that actually overdrew the account was never covered by it. Had the bank instead returned the utility payment unpaid, that would have been a returned-item fee rather than an overdraft fee, and the utility could have added a returned-payment charge of its own. His statement will show the $68 under the heading "Total Overdraft Fees" for the month, with a year-to-date figure beside it.

Pros

• Paying the item rather than returning it prevents a missed insurance premium, rent payment, or loan payment, and the consequences of those can exceed the fee.
• Declining coverage for ATM and card transactions is free, reversible at any time, and cannot lawfully be punished with worse account terms.
• The fee totals are disclosed on the statement under a prescribed heading for both the period and the year, so the annual cost is knowable without any effort.
• Automated balance displays are not allowed to fold in the bank's cushion, so the balance in an app is meant to be the one you actually have.

Cons

• As a form of credit it is extremely expensive relative to the amount advanced, because the fee is a flat charge on a shortfall that is often small.
• Fees are usually assessed per item, so one short day with several debits can produce several charges.
• Declining coverage does nothing about checks, automatic debits, or other transaction types, which are usually the larger amounts.
• The available balance can differ from the balance you saw, so an overdraft can happen to someone who is tracking their spending.
• On a joint account either holder can switch the coverage on or off for both.
• The returned-item alternative can cost twice, once at the bank and once from the payee, and can breach an agreement.