How to write a resignation letter that's effective immediately? A resignation letter is a formal notice stating your intention to leave your job.It typically includes details like your last day and potential next steps. Simply state something like "Effective this dste, consider this my two week's notice. My last day will be September 1. Start with the facts and be direct. Here are the steps for writing a letter to resign without notice: Begin with the date. What It Takes to Write A Great Resignation Letter. Create the perfect resignation letter in 30 seconds with our free AI resignation letter generator.