How To Write A Letter To Confirm Employee . 100% trusted forms & easy to use. The employee confirmation letter format is a letter stating that the person is confirmed as a permanent employee of the company. Employment Verification Letter Template Business Format from www.richkphoto.com If you are the employee, you should ask your employer if you can use their official letterhead. Here is a basic format for a warning letter to an employee. When you write a letter of reference, include this information: