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.How to use the template: 1. In the sample letter, fill in your personal information. I KNOW THERE IS A 30 DAY NOTICE AND OTHER LEGAL VERBIAGE. Your bank may have an account closing letter template or form that you can download from its website or pick up at a branch. Customize these politebuteffective form letters to get consumer help and problem resolution. To whom it may concern: Please accept this letter as my written authorization to close the following account(s) at your financial institution. Example: Selena falls behind on her credit card payments, and after several months of missed payments, the card company marks the account as a charge-off.