Use a formal business format for the actual letter itself. Notify your manager in person before you submit your formal resignation letter.Learn how to craft a professional resignation letter without notice with our guide. Use a one week notice letter template to inform your current employer that you plan to resign within seven days. My last day of work for you will be on X date. A resignation letter needs to include your contact information, official notice that you're resigning, and when your final day of work will be. I offer my sincere apologies for not being able to give you any more notice regarding my resignation. Create an Immediate Resignation Letter without a notice period using our free printable templates. Resign with a professionally designed document. An example of how this could look in a resignation letter is something like this.