Thankyou letters should begin with a statement thanking the vendor for their service. Learn how to write an employee appreciation letter with these templates and examples.Download the template for free (PDF or Word). Services performed on humans are not subject to sales and use tax because people are not tangible personal property. The message of appreciation should stand alone. Be brief, warm, and sincere. 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. 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. No one expects a long letter from you at this time. Plus, earn up to 17X at participating Marriott Bonvoy® hotels.