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. Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. One way to leave on good terms is to write a polite, professional resignation letter in which you thank your employer for your time at the company. What is a No Notice Resignation Letter? 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.