An immediate letter of resignation is a written notice to inform an employer of an employee's imminent departure. Use a one week notice letter template to inform your current employer that you plan to resign within seven days.When resigning for personal reasons, use the following template and examples as a starting point to write your resignation letter. Pick the perfect wording and convey the message best suited for your situation. We've prepared several resignation letter samples and templates for crafting a concise yet professional resignation letter.