How to write a resignation letter that's effective immediately? Learn how to craft a professional resignation letter without notice with our guide.This letter informs your employee that you must depart right away without the standard two weeks' notice. It's time to quit the job, and you're not giving two weeks' notice. Here's how to politely write a resignation letter, effective immediately. Create an Immediate Resignation Letter without a notice period using our free printable templates. Resign with a professionally designed document. Use this resignation letter example to inform your employer that you need to resign immediately and will not be able to give two weeks' notice. Resignation Letter No Notice. Customize any of these resignation letters in minutes using our free AI-powered resignation letter builder..