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.What It Takes to Write A Great Resignation Letter. Create the perfect resignation letter in 30 seconds with our free AI resignation letter generator. Your letter of resignation should be addressed to your immediate boss. Just keep it short and sweet. Don't go into story telling mode. California laws say that, in general, you are not required to give your employers two weeks notice – or any notice – prior to quitting or leaving a job. Though employers who receive two weeks notice may be more likely to give you positive references in the future. Never necessarily need a reasoning for resignation.