Learn how to write a resignational letter if you're quitting for personal reasons. The following are the things to keep in mind when writing an immediate resignation letter: Write the date first.Explain only necessities. In the text, include the date you plan to leave the company. Regretfully, I must submit my immediate resignation for personal reasons. I'm writing to inform you of my decision to resign from my role as (Title) at (Company). My last working day will be (Last working day). Begin your letter with a statement of intent that is brief and focused. State that you are resigning and the effective date. My last day of work in the office will be on (a date two weeks in the future).