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.Download Pennsylvania Immediate Letter Of Resignation template, modify and send for signing using BoloForms Signature. In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. Please accept this letter as my formal resignation. Today will be my last day of work. In this article, we explore what a sameday resignation letter is, why it's important to write one, how to write one and provide a template and an example.