How to write a resignation letter that's effective immediately? In this article, we cover everything you need to know about writing a resignation letter without notice and provide an example to get you started.This letter informs your employee that you must depart right away without the standard two weeks' notice. Create an Immediate Resignation Letter without a notice period using our free printable templates. Resign with a professionally designed document. Use this resignation letter example to inform your employer that you need to resign immediately and will not be able to give two weeks' notice.