How To Write A Merit Raise Letter . Follow these steps to thank your manager for a raise using a handwritten note: I have evaluated his/her performance and deemed him/her worthy of a pay rise. Merit Increase Letter Samples audreybraun from audreybraun.com Thank you so much for this increment, i promise to keep up the good work. How to ask for a raise in person; Hope you will be very happy and try your best to complete all your work successfully.