How to write a resignation letter that's effective immediately? How to Write an Immediate Letter of Resignation?I am writing to inform you that I will be resigning from my current position, X at X, effective immediately. Please accept this letter as formal notice. I am writing to inform you that I will be resigning from my position as (Title) at (Company Name). Your contact information. Your contact information should be at the top of your letter. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. Note that some companies may ask you to terminate employment on the day of your resignation. Company Name Address Dear Sir, I, hereby, tender my resignation from the post of Sales Representative of the firm with immediate effect.