A basic resignation letter should include the fact that you're resigning and the last day you will work. Please accept this letter as a notice of my resignation.This article will guide you through creating an effective notice letter, helping you leave on good terms and with confidence. How to write a resignation letter that's effective immediately? Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Under the Texas Education Code, contract employees are required to resign no later than 45 days before the first day of instruction for the school year. Please accept this letter as my formal resignation. Today will be my last day of work.