A charitable organization soliciting in Maryland generally must file documents with the Office of the Secretary of State. Since most charitable organizations are considered section 501(c)(3) organizations, donations to these charities are generally tax deductible for the donor.Charitable entities in Maryland should complete this application to qualify as distributors of disposable diapers, other hygiene products for infants and. Simply print, complete, and mail in one of our short donation forms below. You will receive a tax receipt for your donation in the mail. Where can I mail a donation? To claim the credit, you must complete Part K of Form 502CR and attach to your Maryland income tax return. As mentioned above, to claim a charitable donation, you need to itemize your deductions using Form 1040, Schedule A as part of your tax preparation. Once your articles of incorporation have been approved, you can file for your EIN. Simply print, complete, and mail in one of our short donation forms.