The following are the things to keep in mind when writing an immediate resignation letter: Write the date first. Explain only necessities.In this post, I discuss frequently asked questions about an employee or employer ending the employment relationship without notice or cause. It is perfectly legal to ask an employee to sign a resignation letter at any time. They don't have to sign it. Learn how to craft a professional resignation letter without notice with our guide. Your employer can ask you to resign at any time, with or without cause, or notice. In California, you can be fired after handing in your 2 weeks notice. While you will not earn your wages, it turns your resignation into a termination. You don't need to hire a resignation letter professional.