Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template.Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. How to write a resignation letter that's effective immediately? This is to notify you that I would like to resign from my position as (your post) effective immediately from tomorrow. When resigning without notice, your letter should state clearly that the resignation will be effective immediately.