Simple steps for how to write an employee appreciation letter to help your employees feel recognized, valued, and indispensable. If the spouse does not fill out the form, the employer shall withhold.Georgia income tax as if the spouse is single with zero allowances. An employee appreciation or thank you letter is a formal message from an employer that recognizes the former's contribution to the company they work for. All requests should include your name, address and telephone number as well as background about your organization. Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word). This guide will show you: A sample letter of appreciation for support better than 9 out of 10 other samples out there. 9 Form (Federal) The 9 form verifies an employee's identity and certifies that the employee is legally allowed to work in the United States. 1a. Type or print in ink (not pencil) your full name as it appears on your Social Security card. 1b.