The short answer
Understand the system before choosing an action.
An overdraft occurs when a transaction exceeds the funds available under the account’s rules. A bank or credit union may decline the transaction, return it, cover it under an overdraft practice, transfer funds from another account, or extend another form of coverage. Fees and eligibility depend on the institution, account, transaction type, disclosures, and applicable rules.
Financial Learning Cafe explains the subject. Your current agreement, official sources, facts, jurisdiction, and appropriately qualified professionals control the decision.