Demonstrate broad participation and support of neighborhood residents with your project. Knowing how to write an in-kind donation letter for your nonprofit means understanding the do's and don'ts.Let's check them out! Bystep guide on how to fill out a Goodwill tax donation receipt. This form is available at our stores in Maine, New Hampshire and Vermont. Have the ability to donate in honor of, or in memory of someone. Receive an immediate email thank you and receipt for your contribution. Complete this form to request an appointment for a marriage license or ceremony. How do I work out the value of an in-kind donation? Send a letter out tomorrow.