Application deadline: Tuesday, April 27, 2021 no later than pm. Deadline is firm and late applications will not be accepted. INSTRUCTIONS. 1.A good in-kind donation letter is authentic, shows concern, and provides a context for the need for the donation. What do you need to include in your donation acknowledgment letter? Want to learn how to write and structure donor acknowledgment letters? Check out these tips and sample letters to make a greater impact. A gift acknowledgment form: Show your donors you're appreciative of their donations and explain the value they've brought to your nonprofit. A timely and sincere thank you message that provides evidence of how funds raised are making a difference will help you keep donors interested. What to include in donor acknowledgment letters?