How to write a resignation letter that's effective immediately? Learn how to craft a professional resignation letter without notice with our guide.It is your choice to disclose the nature of your reasons for leaving, however, if you do, limit your reason to no more than two sentences. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. We'll share and go through our top 10 resignation letter examples with and without a reason. 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. Keep it very brief and to the point. In the letter, include the date you plan to leave the company. Learn how to write a heartfelt resignation letter with our guide.