Learn how to write a compelling salary increase letter to reward performing employees with our tips, checklist, and free templates. The Illinois Department of Revenue (IDOR) sends letters and notices to request additional information and support for information you report on your tax return.Need to write a salary increase letter to an employee? Follow these step-by-step instructions to write your own, or steal one of our pre-made templates. This letter confirms the amount of increase and the company's appreciation for a job well done. This article will guide you stepbystep through writing a salary increase letter. We also included two templates you can use immediately and five examples. An employment verification letter may contain information such as the employee's job title, start date, hours worked, salary, and more.