overdraft

Imagine making one more payment, only to find that your account has already run out of money. That is the basic idea here. It happens when you spend more from your bank account than you actually have in it. The bank may still let the payment go through by covering the missing amount, but it will often charge a fee and expect you to repay the extra money.

This can happen with checks, automatic payments, transfers, or other transactions that arrive when your balance is too low. The costs can add up quickly, so it helps to watch your balance and avoid going into the red. Some people also use "overdraft protection," where money is moved from savings or another account to cover the gap.

An overdraft happens when more money leaves your bank account than you have available, creating a negative balance. It can happen when a check, payment, transfer, or withdrawal is processed even though there is not enough money in the account.

In everyday use, the word often refers to the situation where the bank covers the shortfall instead of rejecting the transaction. If that happens, the bank may charge an overdraft fee, and repeated fees can build up quickly if several payments are made while the account stays below zero. In other cases, the bank may simply decline the payment because there are not enough funds.

There are several ways to avoid the problem: tracking your spending carefully, setting low-balance alerts, keeping a small buffer in the account, or linking another account for "overdraft protection." In that arrangement, money is moved automatically to cover the gap, often at a lower cost than a standard overdraft fee.

The word also has a more formal banking meaning. An "overdraft facility" is a pre-approved arrangement that lets a person or business spend more than the current balance up to a set limit. That is different from doing it by accident, because it is planned in advance and usually comes with stated terms, fees, or interest.

So, whether you mean an accidental negative balance or a planned borrowing arrangement, the idea is the same: more money goes out than the account can normally cover, and there is usually a cost attached.