NSF Fee (Non-Sufficient Funds Fee)

An NSF fee, short for non-sufficient funds fee, is what a bank charges when it refuses to pay a check, ACH debit, or other item because your balance is too low. The payment bounces back to the merchant, and you are charged anyway. That is the key difference from an overdraft fee, where the bank covers the payment and charges you for the favor.

NSF fees are at the center of many bank fee class actions because of a practice called re-presentment. When a merchant's payment bounces, the merchant often submits it again a few days later. If the account is still short, some banks charged a second NSF fee on what the customer saw as one payment. Lawsuits have argued that account agreements described each "item" as a single payment, so charging fees on every retry broke the contract.

Federal regulators have also looked at these fees. In January 2024, the Consumer Financial Protection Bureau proposed a rule to prohibit NSF fees on transactions that are declined in real time, such as a debit card swipe or ATM withdrawal that is refused on the spot. The CFPB said banks almost never charge for those instant declines today, and framed the proposal as stopping a new junk fee before it spread.

If you were charged repeated NSF fees for the same payment, check your statements for matching amounts from the same merchant a few days apart. That pattern is what many of these cases are built on. Our page on overdraft and NSF fee lawsuits tracks current cases, and the guide on getting overdraft fees refunded explains how to ask your bank for money back before any lawsuit is involved.