How to write a resignation letter that's effective immediately? Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template.Learn how to write a resignation letter due to family reasons with our stepbystep guide and sample letters. This letter includes details such as your last day of employment, transition steps, words of gratitude and, optionally, your reasons for leaving. Dear Mr. Clark, I am writing to inform you that I am resigning from my position at Innovate Tech Labs, effective immediately. In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. Your resignation letter should be to the point, concise, and clear. Your resignation letter should be to the point, concise, and clear. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. This resignation letter is only for an employee who is resigning from a particular position, not the company itself.