How to write a resignation letter that's effective immediately? Create an Immediate Resignation Letter without a notice period using our free printable templates.Resign with a professionally designed document. Employees can quit without notice and employers aren't required to give notice before firing someone. The Immediate (Short Notice) Resignation Letter is required when the employee needs and wants to leave the workplace immediately. The 30-day period is contained in law, and immediate resignation is only allowed in several circumstances mentioned in the link above.