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.Learn how to craft a professional resignation letter without notice with our guide. Use our immediate resignation letter template to create a personalized letter that allows you to leave your job professionally. I am writing to announce my resignation, effective in 24 hours. Download a free immediate effect resignation letter template, easily customizable for your personal situation. A nonprofit newsroom devoted to covering equity in education with in-depth analysis and data-driven journalism.