A basic resignation letter should include the fact that you're resigning and the last day you will work. Resignation acceptance letter template.Attach employee resignation letter to the eForm. This article will guide you through creating an effective notice letter, helping you leave on good terms and with confidence. Under the Texas Education Code, contract employees are required to resign no later than 45 days before the first day of instruction for the school year. 1. Prior to submitting a resignation online, an employee should inform their direct supervisor.