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.Use our immediate resignation letter template to create a personalized letter that allows you to leave your job professionally. Customize and Download this "Retirement Notice 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. Use an attractive header with your personal contact info, include the recipient's name, company and address, and include the date. Looking to resign with a 24 Hours Notice Resignation Letter? Use our resignation letter template for notice-period roles. Customize and Download this "Retirement Notice Letter". If you find it awkward to open up to your boss about your career transition plans, sending a resignation letter may be a good start.