Please accept this letter as a notice of my resignation. Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template.How to write a resignation letter that's effective immediately? Your resignation letter should be brief and to the point. You don't need to include lengthy explanations about why you are resigning. Please accept this letter as my formal resignation. Today will be my last day of work. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. Resignation letters are professional courtesies that extend your professionalism, even in the last days of current employment. You should include your title, company name, and last day of employment with them.