How to write a resignation letter that's effective immediately? Start with the facts and be direct.A basic resignation letter should include the fact that you're resigning and the last day you will work. Give a clear reason for leaving, but there is no need to overexplain. Resignation letters are professional courtesies that extend your professionalism, even in the last days of current employment. Example. After careful consideration, I have decided to resign immediately to address personal matters that require my full attention. 3. When writing your letter, it's important to format the letter correctly and state your resignation in the first line of the letter. Welcome to USA Powerlifting The Athlete's Choice For Drug-Free Strength Sport Online Training App USA Powerlifting's Official Online Training App.