Download a free immediate effect resignation letter template, easily customizable for your personal situation. How to write a resignation letter that's effective immediately?The first paragraph should state that you're leaving your job and mention the exact date when that will come into effect. Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Download free sample resignation letters in Microsoft Word and other formats. Easily edit and customize your resignation letter template. In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. A simple resignation letter format includes a resignation statement, an appropriate notice period, and an expression of gratitude. Please accept this letter as my formal resignation. Today will be my last day of work.