File Forms 504 by the 15th day of the 4th month following the close of tax year or period. All business credits taken on the 502S and 504CR must be filed electronically. Maryland requires certifications and supporting documents be attached as a PDF.
To submit the Maryland Form 504, ensure all fields are accurately completed. You can file the form by mail to the Comptroller of Maryland, Revenue Administration Division, 110 Carroll Street, Annapolis, MD 21411-0001.
You may submit paper tax forms and payments at any of the local branch offices between a.m. - p.m., Monday through Friday. 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.
To submit the Maryland Form 504, ensure all fields are accurately completed. You can file the form by mail to the Comptroller of Maryland, Revenue Administration Division, 110 Carroll Street, Annapolis, MD 21411-0001.
When and Where to File File Form 500 by the 15th day of the 3rd month following the close of the tax year or period, or by the original due date required for filing the federal return. The return must be filed with the Comptroller of Maryland, Revenue Administration Division, Annapolis, Maryland 21411-0001.