How to write a resignation letter that's effective immediately? The law in North Carolina is at will.You can quit or be fired at any time for any or no reason, no notice is mandated. Learn how to write a resignation letter (and what not to include) and then use our example letters as a guide. Employers may also want to consider the impact an immediate separation would have on remaining employees. (For example, "I regret to inform you that I will be resigning from my position, effective immediately.