How to write a resignation letter that's effective immediately? 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.Pick the perfect wording and convey the message best suited for your situation. In the letter, include the date you plan to leave the company. To write a short notice resignation letter, include your position and effective date, explain your reason and express gratitude. Just write out a basic letter to them, stating your basic details, the date you told them you were leaving, and the date you intend to leave. Create an Immediate Resignation Letter without a notice period using our free printable templates. Resign with a professionally designed document. This article will address how to write a retirement letter of resignation and provide an example that you can use as a template for your own retirement letter. How to write a no notice resignation letter.