Only donations to qualified organizations are tax deductible. Religious organizations should complete Form PTAX-300-R, Application for Religious Property Tax Exemption.The required attachments are listed on that form. We've created this stepbystep guide on everything you need to know about creating a donation receipt letter for tax purposes. To secure in-kind donations, your request letter should convey authenticity, concern, need, and authority. Learn about the importance of preparing and distributing acknowledgement letters on a timely basis to donors at tax time - Warady Davis - Chicago CPA. In this article, we will focus on applying for taxexempt status for 501(c)(3) organizations in Illinois. This includes income, sales, and real estate taxes. A copy of the City of Chicago's IRS tax exempt status verification is available upon request. Transparency: Reporting of Gifts to the City of Chicago.