When resigning for personal reasons, use the following template and examples as a starting point to write your resignation letter. I am writing to inform you of my decision to retire from my position as (Your Job Title) at (Company Name).My last day of work will be (Date). Simply write that you're leaving for "personal reasons" after stating your intent to resign and your last day of employment with the company. Begin your letter with a statement of intent that is brief and focused. State that you are resigning and the effective date. Dear (name of manager),. This letter is to formally inform you of my resignation from my position beginning (date). Once you have given notice, you have already begun the mental process of checking out. Ideally, you should do this in person.