Learn how to create customized tax deduction letter for your church - with the help of 2 FREE samples and steps on how Donorbox can help! For voluntary contributions made to a qualifying foster care charitable organization (QFCO), see credit Form 352.Form Number. 321. Category. Complete and mail the Stock Donation Letter of Intention. To begin the process of donating stock, please complete the Stock Donation Letter of Intention. Please follow IRS guidelines in completing the description of goods donated and the value of the goods donated. Learn how to write effective fundraising letters that inspire more support from donors. Explore best practices and templates in this comprehensive guide. How do I write a nonprofit donation tax receipt? Your donation receipt can be a mailed thank-you letter or an emailed acknowledgment.