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.In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. State your resignation. Modify the resignation statement to reflect the urgency of your notice period. Just keep it short and sweet. Don't go into story telling mode. Learn how to write a professional resignation letter with our step-by-step guide and easy to use templates. Felt obliged to give his party a post-dated resignation letter. It published its 19th and final report on 20 October 2022.