Complete required documentation: Depending on your bank, you may need to fill out a form, and in some cases this form must be notarized. Want to close a bank account?You might need to submit a written request. Dear Bank Manager, I am writing to request the closure of my bank account with the number 123456789. You can also send a written request. It needs to include your full account number, a message saying you want that account closed, and your signature. To close the account, call your bank, visit the bank in person, or write a letter to their offices. See this sample Physician's Letter for Travis County Gender Marker Court Order.