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.Explain only what is necessary. Give a clear reason for leaving, but there is no need to over-explain. State that you wish to quit and include your final day of work. PC Resignation Processing ; Step 1. Download and complete a Resignation Letter. In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. Non-profit civil liberties group founded in 1999 with the mission of protecting freedom of speech on college campuses in the United States.