This letter is to confirm that we have been assessing your work closely, and that we have decided to increase your salary from Old Salary to New Salary. Learn how to write a compelling salary increase letter to reward performing employees with our tips, checklist, and free templates.Easily create and download salary verification letters for employment proof and income confirmation. This article will guide you stepbystep through writing a salary increase letter. We also included two templates you can use immediately and five examples. The Wage Theft Prevention Act (WTPA) took effect on April 9, 2011. The law requires employers to give written notice of wage rates to each new hire. Pay increase letters benefit employers and employees because they document salary and position changes. Get your free pay increase letter templates here. In this case, the purpose of a salary increase letter is twofold: acknowledging boththe promotion and the new salary.