We've created this stepbystep guide on everything you need to know about creating a donation receipt letter for tax purposes. The acknowledgement letter will also serve as the tax receipt.To register with Bexar County, verify your eligibility. Are pleased to inform you that upon review of your application for tax exempt status we have determined that you are exempt from Federal income tax. Keep a record of any items you donate to a charity. Most recent utility bill (water, gas, electric). Home based organizations may provide a home utility bill. Acknowledgement and tax receipts are different.