Banks may close a customer’s account for several reasons, including:

1. Inactivity: If a customer doesn’t use their account for a prolonged period of time, the bank may close it.
2. Suspicious activity: Banks are required to report suspicious transactions to the government and may close an account if they suspect illegal activity.
3. Overdrawn balance: If a customer regularly overdrafts their account, the bank may close it to protect their own interests.
4. Violation of bank policies: Banks may close an account if a customer violates their policies, such as writing bad checks or engaging in fraud.
5. Risk management: Banks may close an account if they determine that the customer poses too much risk to their business.
6. Change in bank policies: Banks may change their policies and decide to no longer serve certain customers or types of accounts.

In most cases, banks are required to give customers notice before closing their accounts, but in some cases, they may close them without prior notification. It’s important for customers to regularly monitor their accounts and stay in compliance with the bank’s policies to avoid account closure.