How to write a resignation letter that's effective immediately? You're not entitled to any notice period, unfortunately; your employer can terminate you at any time.Learn how to craft a professional resignation letter without notice with our guide. No state or federal law requires you to notify your boss two weeks before leaving your job. If you're an at-will employee, you can leave at any time. First, it's important to know that Utah is an "at-will" employment state. It is usually two standard weeks or 14 days, including the weekend. 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. It's time to quit the job, and you're not giving two weeks' notice.