How to write a resignation letter that's effective immediately? Download Pennsylvania Immediate Letter Of Resignation template, modify and send for signing using BoloForms Signature.Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. You might simply say, "I was recently offered a new position" or, even more simply, "I am writing to confirm my resignation. This decision has not come easily.