How to write a resignation letter that's effective immediately? 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.To write a good and simple resignation letter, greet your manager formally, then state your intent to resign and the date you'll officially depart. I have accepted a new role as (job title) at (company name). 1. Statement of Resignation. Begin your letter with a clear statement of your resignation, including your role and the effective date. I apologize for putting you and your team in an unfavorable position, but the situation needs my immediate attention. This sets the tone and leaves no room for ambiguity. Follow proper business letter format in writing your resignation letter — just as if you were writing a cover letter seeking a new job. Start with a proper greeting: Address your resignation letter to your immediate supervisor or manager.