In this article, we walk you through all the steps to writing and formatting the letter, including a sample and a template. I do not plan to use the account, therefore, I would like the credit line to be closed out.To whom it may concern: Please accept this letter as my written authorization to close the following account(s) at your financial institution. Want to close a bank account? You might need to submit a written request. 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. 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. Letter of Credit Form. Letter of Credit Agreement.