Leaving a job isn't easy. In the letter of resignation, leave your basic contact information in the header.Official Seal of the State of Arizona. Contact. Add contact details, company name, and date. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. Craft a concise, professional resignation letter. The employee should make sure to include their name, current job position, a brief explanation of why they are resigning, and what date their last day will be. A simple resignation letter format includes a resignation statement, an appropriate notice period, and an expression of gratitude. They should be written in a respectful and professional tone, and be submitted directly to the employee's supervisor or manager. Then, state your intent to resign and exact date of departure.