How to Write an Immediate Letter of Resignation? 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. In this article, we'll provide a detailed resignation letter example to help you leave your current position on good terms. Below is a sample union resignation letter. You should check your union's constitution and bylaws to see if it is specific to whom a resignation must be sent. I am writing to inform you that I will be resigning from my position as (Title) at (Company Name). I wish you and the company the best in the future. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. Because this serves as official notification of your leaving the company, clearly state the last day of work, your job title title and the company name.