How to write a resignation letter that's effective immediately? Ensure the most current form has been submitted.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. In 2015, a husband and wife in San Bernardino, Calif.