How to write a resignation letter that's effective immediately? Download a free immediate effect resignation letter template, easily customizable for your personal situation.In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. Note when your last day of work will be in the letter, and if possible, try to provide at least two weeks' notice before your departure. Start with the facts and be direct. Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. Sec. 14-150. - Written resignation to be requested with copy forwarded to director. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. Note when your last day of work will be in the letter, and if possible, try to provide at least two weeks' notice before your departure.