How to write a resignation letter that's effective immediately? Start with the facts and be direct.My resignation is effective immediately. Explore why a good resignation letter is important and how to write it, and check out our free resignation letter examples. Please accept my sincerest apologies for being unable to provide you and the Davidson Team with a notification that includes a minimum two-week notice. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. The first section of your resignation letter should be direct and to the point. Smith, I am writing this letter to formally announce my resignation from my job position effective immediately on August 25. Please accept this letter as my formal resignation. Today will be my last day of work.