Home Business Sales and Use Tax Contact Information for Sales and Use Tax Contact Information for Sales and Use Tax E-mail You can e-mail your sales and use tax questions to us at sut@marylandtaxes.gov Please include your business name, address and your nine-digit federal employer identification number (FEIN) or eight-digit Maryland central registration number in your e-mail message. This will help us generate a quick response to your inquiry. Telephone Assistance Call 410-260-7980 or toll-free 1-800-638-2937 from elsewhere in Maryland. Telephone assistance is available Monday through Friday, 8:30 a.m. - 4:30 p.m. EDT Mailing Address Revenue Administration Division Taxpayer Service Division 110 Carroll Street Annapolis, MD 21411-0001