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.I am resigning my position effective immediately. Download a free immediate effect resignation letter template, easily customizable for your personal situation. Your letter of resignation should be short and professional. In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. I have therefore come to the conclusion that I should make this statement and step down, with immediate effect.