How to write a resignation letter that's effective immediately? Learn how to craft a professional resignation letter without notice with our guide.Giving a two week notice isn't required; it is merely a professional courtesy. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. My last day of work in the office will be on (a date two weeks in the future). 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. Write a resignation letter, and give two weeks if possible, not just one. I highly recommend talking to the manager in person. A two (2) weeks notice resignation letter is the most common letter used when notifying an employer of an official resignation.