How to write a resignation letter that's effective immediately? This resignation letter sample provides your employer with a letter for your file and also suggests that you've done everything you can to remain professional.Due to unforeseen personal reasons, I am unable to provide any notice. Here is a short notice resignation template you may use to assist you with writing a resignation letter. 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. How to Write an Immediate Letter of Resignation? I am an exempt, hourly employee.