If you are sending a Form 502 or Form 505 (with a payment) through the US Postal Service, send it to: Comptroller of Maryland, Payment Processing, PO Box 8888, Annapolis, MD 21401-8888.
All other returns (including those without payment by check or money order), other payments, and correspondence regarding your personal or business tax account(s) should be sent to:: Comptroller of Maryland, Revenue Administration Division, 110 Carroll Street, Annapolis, Maryland 21411-0001.