If you have a sales tax permit, you must file a Texas Sales and Use Tax Return with the Comptroller's office, even if you have no sales or no tax to report. Learn how to easily create your donation receipts and the best practices to follow in the year-end receipts to your donors.Donations to RMHC Greater Houston are deductible. Donors should consult their tax advisor for questions regarding deductibility. Third Party Raising Funds for Charity. Submit Your Request. We typically send a letter on our letterhead when we receive donations of any kind. Tax return or check stub, if possible. Any form of government assistance award letter, if possible. Explore the many tax-deductible donation options below, and help Memorial Park Conservancy preserve, restore, and enhance Memorial Park for all Houstonians.