How to write a resignation letter that's effective immediately? In the first sentence, clearly state your intention to resign and that your resignation is effective immediately.Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Be sure to include your last date of work and briefly mention why you are resigning. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. Please be advised that I am resigning my position with immediate effect. Regards,. "A man is nothing without his conscience," he wrote in his resignation letter. The former president fulfilled his final wish when he filled out an absentee ballot for Harris on Oct.