How To Write A Leave Letter From Company . Here are the steps for writing an annual leave letter: A personal leave letter is a formal letter written by the employee addressed to the employer. Rejoining Letter Format and Samples of After Leave and Maternity from www.aplustopper.com Leave approval letter template one. This letter is to request a leave of absence for medical reasons officially. A company leave letter is similar to a leave of absence letter, where an employee puts forward a formal request for leave from work for a certain period of time.