How to write a resignation letter that's effective immediately? Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips.We've rounded up tips and examples for writing a resignation letter that'll help you maintain work relationships long after leaving a company. I am writing to inform you that I will be resigning from my position as (Title) at (Company Name). Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. My resignation is effective immediately. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. I wish you and the company the best in the future. Give a clear reason for leaving, but there is no need to overexplain.