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.Below is an example of an immediate resignation letter from an employee who needed to leave their position due to severe work-related stress. Smith, I am writing this letter to formally announce my resignation from my job position effective immediately on August 25. Please accept this letter as my formal resignation. Today will be my last day of work. Explore essential resources for terminating employment in NY with our termination letter samples and notices. This Easy Form does not deliver your resignation letter to your principal. I wish you both great success going forward. In the meantime, please let me know if I can assist you in any way during this transition period. Sincerely,.