A Notice to Customer of Check Returned NSF is a formal written notification sent to a customer when a check they have written is returned by the bank for insufficient funds (NSF). It informs the customer of the amount of the check, the check number, the date it was written, and the name of the payee. It will also include the bank’s policy on insufficient funds, including any fees or penalties that may be applied. Depending on the bank’s policy, the notice may also include a demand for payment of the check amount plus any applicable fees or penalties. There are two main types of Notice to Customer of Check Returned NSF: a regular notice and a legal notice. A regular notice is a standard form of communication from the bank to the customer. It may be sent by mail, email, or other electronic means. A legal notice is a more formal document, usually sent by certified mail. It informs the customer that the check has been returned by the bank and that the customer is legally obligated to pay the amount of the check, plus any fees or penalties.