In this article, we'll cover how to write a donation letter. Use one of our six sample donation request letter templates to get started.Use this online template to add donations through your website. What is an In-Kind Donation Letter? Edit, sign, and share donation form for a team online. No need to install software, just go to DocHub, and sign up instantly and for free. In this post, I'm breaking down how to write a donation letter. "Learn about 501(c)(3) donation receipt requirements, verification steps, and sample templates for tax-deductible donations. How To Write the Perfect Donation Request Letter Start with a greeting. Explain your mission.