How to Write an Immediate Letter of Resignation? How to write a resignation letter that's effective immediately?Company Name Address Dear Sir, I, hereby, tender my resignation from the post of Sales Representative of the firm with immediate effect. I am writing to inform you about my immediate resignation from your company. Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience. This document must be filed with the Secretary of State. 2. Employers may also want to consider the impact an immediate separation would have on remaining employees. Write to any client with an active file, advising them that you are unable to continue representing them and that they need to retain new counsel.