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.How to write a resignation letter that's effective immediately? When providing a reason, keep it brief. No need to get into the specifics. PC Resignation Processing ; Step 1. Download and complete a Resignation Letter. 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. I regret to inform you that I will be leaving XXX on June 13th, 2022. In the opening paragraph, clearly state that you are resigning from your position.