Formal Resignation Letter Sample. In this article, we discuss what to include in a professional resignation letter and we share examples of resignation letters you can use for reference.I will go over a step-by-step resignation template letter you can use, how to structure it and provide examples of resignation letters. Start with a two weeks notice letter. This will serve as a formal, written documentation of your intent to leave and your transition timeline. Please accept my formal resignation from the ABC Agency. My last day of work with the company will be September 2, 2022, two weeks from today. A simple resignation letter format includes a resignation statement, an appropriate notice period, and an expression of gratitude. It's also best practice to send your resignation letter to your employer at least two weeks before your last day at the company.