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. This letter is to officially inform you that I resign from my position as xxxxxxx, effective immediately. In the first sentence, clearly state your intention to resign and that your resignation is effective immediately. Add contact details, company name, and date. I am resigning my position effective immediately.