How to write a resignation letter that's effective immediately? Write a letter of resignation.It's up to you how detailed you want to make it. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. My last day of work for you will be on X date. This resignation letter sample provides your employer with a letter for your file and also suggests that you've done everything you can to remain professional. I know it has helped me grow in my career. I'm emailing you to formally resign as (job title) at (company name). A letter of resignation is a document that notifies your employer that you're leaving your job. The latest news and information from the Biden-Harris administration.