How to write a resignation letter that's effective immediately? Please accept this letter as a notice of my resignation.Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. Use one of our resignation letter templates. A basic resignation letter should include the fact that you're resigning and the last day you will work. This letter informs your employee that you must depart right away without the standard two weeks' notice. Provide your supervisor with a written letter of resignation, including the effective date of your resignation. Your resignation letter should indicate the reason for your resignation, and your expected last day of employment.