Immediate Letter of Resignation – is a written notice to inform an employer of an employee's imminent departure. Download a free immediate effect resignation letter template, easily customizable for your personal situation., effective immediately. Create your immediate resignation letter online in minutes. Customize, download, and resign professionally with ease. How to write a resignation letter that's effective immediately? Use one of our resignation letter templates. Looking to resign with a 24 Hours Notice Resignation Letter? Use our resignation letter template for notice-period roles. Simple tips for how to write a resignation letter, with free copy-and-paste resignation letter templates.