The following are the things to keep in mind when writing an immediate resignation letter: Write the date first. Explain only necessities.To write a short notice resignation letter, include your position and effective date, explain your reason and express gratitude. Commence your letter with a formal salutation and a concise introductory paragraph. 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. They can accept your resignation immediately and it's still a quit. The Immediate (Short Notice) Resignation Letter is required when the employee needs and wants to leave the workplace immediately. Say "personal reasons" as a reason for quitting a job. I do not wish to explain in detail to my employer my reasons for leaving the job. With deep regret, I am writing to inform you that I am resigning from my position as sales manager for personal reasons.