What is required in a donation acknowledgement letter? Since most charitable organizations are considered section 501(c)(3) organizations, donations to these charities are generally tax deductible for the donor.In many cases, charitable donations are tax-deductible. When you donate to a qualifying organization, you can deduct the amount from your taxable income. To apply for an exemption certificate, complete the Maryland SUTEC Application form. We offer several ways for you to obtain Maryland tax forms, booklets and instructions: