A simple resignation letter format includes a resignation statement, an appropriate notice period, and an expression of gratitude. Your letter of resignation should be short and professional.In the opening paragraph, clearly state that you are resigning from your position. In this article, we discuss what to include in a professional resignation letter and we share examples of resignation letters you can use for reference. A simple resignation letter template should include your name, position, company name, date, and a brief statement of your intention to resign. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips.