How to write a resignation letter that's effective immediately? How to Write an Immediate Letter of Resignation (4 steps).Pick the perfect wording and convey the message best suited for your situation. Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Learn how to write a professional resignation letter due to unfair treatment. Use a one week notice letter template to inform your current employer that you plan to resign within seven days. 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. In the text, include the date you plan to leave the company. Regretfully, I must submit my immediate resignation for personal reasons. What is a No Notice Resignation Letter?