State your position on the day of resignation: Always mention the position you held in the office on your last working day. How to write a resignation letter that's effective immediately?Simple resignation letter and email message samples to use to quit a job, as well as tips for what to write and how to resign. In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience. 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. Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Use business letter format. Use proper business letter format so your letter looks professional. Adhere to the outlined plan in the resignation letter. Notice of leaving the job and last day of work.