It's time to quit the job, and you're not giving two weeks' notice. Here's how to politely write a resignation letter, effective immediately.How to write a resignation letter that's effective immediately? Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. In this article, we cover everything you need to know about writing a resignation letter without notice and provide an example to get you started. When providing a reason, keep it brief. No need to get into the specifics. I regret to inform you that I will be leaving XXX on June 13th, 2022. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. A company can't force you to reveal why you are leaving, that would be illegal.