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. The complete guide to writing your resignation letter including expert tips, free copyable samples, and templates. In this article, we explain how to write a twoweek notice letter and we provide templates, tips and examples to help you get started. This sample resignation letter is available for use on UpCounsel. Resignation Letter Template with Free Sample Form. 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. Taylor discusses 6 key aspects of writing a resignation letter, including when to give notice, what to say, how to format it, and how to deliver it.