How to write a resignation letter that's effective immediately? Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template.In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. 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. Use our immediate resignation letter template to create a personalized letter that allows you to leave your job professionally. Looking to resign with a 24 Hours Notice Resignation Letter? Use our resignation letter template for notice-period roles.