This letter is to notify you that I will no longer be able to fulfil my duties as a (your role) at your company, effective from (date). I regret to inform you that I am resigning from my position here immediately as a Business Development Consultant for personal reasons.Explore readymade resignation letter templates tailored for different situations, learn about its essential components, and do and don'ts. How to write a resignation letter that's effective immediately? A resignation letter is a formal notice stating your intention to leave your job. It typically includes details like your last day and potential next steps. Explore why a good resignation letter is important and how to write it, and check out our free resignation letter examples.