How to write a resignation letter that's effective immediately? How to Write an Immediate Letter of Resignation?Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience. Create an Immediate Resignation Letter without a notice period using our free printable templates. Resign with a professionally designed document.