How to write a resignation letter that's effective immediately? If your boss asks you to resign immediately without reason or notice period, what steps should be taken in this situation?Short, polite, to the point. "This note is to inform you that I have chosen to end my employment with XXXXX, effective immediately (today's date)." If someone gives a resignation letter without giving the required one month's notice, what can his employer do against him (like filing a complaint)? In this article, we cover everything you need to know about writing a resignation letter without notice and provide an example to get you started. Read below for a sample resignation letter with 24 hours notice. Use this sample to learn how to format your letter and what content to include. Dear (Supervisor Name):. This letter is to inform you that I am resigning from my position as (job title) with (company name), effective (date).