How to write a resignation letter that's effective immediately? 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. Download Pennsylvania Immediate Letter Of Resignation template, modify and send for signing using BoloForms Signature. In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. Looking to resign with a 24 Hours Notice Resignation Letter? Use our resignation letter template for notice-period roles. I am resigning my position effective immediately. Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template.