Overdrafts have been opt-in by regulation since 2010. What banks have done is try to trick people into opting into "overdraft protection," which is really just the old system that allows a customer's checking balance to drop below 0: https://www.wellsfargo.com/credit-cards/features/overdraft-p... As long as a customer takes no action or just says "no," they won't be allowed overdraw their checking balance.