Use a formal business format for the actual letter itself. Notify your manager in person before you submit your formal resignation letter.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. Create an Immediate Resignation Letter without a notice period using our free printable templates. Resign with a professionally designed document. Looking to resign with a Resignation Letter Without Notice? Use our resignation letter template for notice-period roles.