How to write a resignation letter that's effective immediately? Ensure the most current form has been submitted.Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. This letter serves as my formal notice of resignation from your project as a freelancer, effective immediately after completing ongoing tasks. An employee wishing to leave in good standing shall file a written resignation with the appointing authority in the form of a Resignation Notice or a 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.