In this article, we walk you through all the steps to writing and formatting the letter, including a sample and a template. How to use the template: 1.In the sample letter, fill in your personal information. I do not plan to use the account, therefore, I would like the credit line to be closed out. Thank you for closing my account promptly. In this blog, we'll explore the essential steps and provide a sample letter template to guide you through writing a formal letter for closing your bank account. It can be as simple as "we are closing your account as of X date. To whom it may concern: Please accept this letter as my written authorization to close the following account(s) at your financial institution. Get your free copy here! You can use WalletHub's free template below to send closing instructions to your bank and to request a check for your remaining balance, if any.