The following are the things to keep in mind when writing an immediate resignation letter: Write the date first. Explain only necessities.Please accept this letter as notification that I am resigning from my position with ABCD Company on September 15. Inform the employer why you need to resign immediately without giving them advance notice. This template provides more detailed information. Looking to resign with a Resignation Letter Without Notice? Use our resignation letter template for notice-period roles. This is to notify you that I would like to resign from my position as (your post) effective immediately from tomorrow.