Use an attractive header with your personal contact info, include the recipient's name, company and address, and include the date. Learn how to write a professional resignation letter with our stepbystep guide including 15 resignation letter examples for various situations.Learn how to write a professional two weeks notice letter with our easytouse template. How to write a resignation letter that's effective immediately? State the Position You're Resigning From With An Effective Date. In the next paragraph, briefly express how thankful you are for the opportunities and experiences you've gained throughout your tenure with the company. What should you include in a resignation letter? My resignation is effective immediately. Typically, a twoweek notice period is standard, unless otherwise specified in the employment contract. Lack of Clarity About Resignation Date.