I regretfully have to inform you that, after much thought, I have decided to resign and please accept this letter as a formal notice of my resignation. It's time to quit the job, and you're not giving two weeks' notice.Here's how to politely write a resignation letter, effective immediately. In the opening paragraph, clearly state that you are resigning from your position. I am writing to inform you I am resigning from my position as job title. My last day will be date. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips.