How do I format a resignation letter? A resignation letter is a business letter, so it follows formatting conventions for business letters.Use one of our resignation letter templates. In this article, we share tips for writing a short, simple resignation letter and offer examples for you to reference when creating your own. The complete guide to writing your resignation letter including expert tips, free copyable samples, and templates. This sample resignation letter is available for use on UpCounsel. A two weeks' notice letter of resignation is a professional courtesy and at times a contractual obligation. Here's how to let your boss know you're leaving.