In this article, we share tips for writing a short, simple resignation letter and offer examples for you to reference when creating your own. How to write a resignation letter that's effective immediately?It is legal for you to give a one day notice, or no notice at all, unless you are contractually obliged to do so. Customer: I have an employee who put in a two weeks notice(Texas). We accepted the resignation and made it effective immediately due to many factors. A professional resignation letter most importantly outlines the details of your employment and departure. This letter is to officially inform you that I resign from my position as xxxxxxx, effective immediately. "After careful consideration, I have decided to resign due to personal family matters that require my immediate and full attention. Resignation letter for short notice. Adhere to the outlined plan in the resignation letter.