System Availability - The Online Service center is available 24 hours a day, 7 days a week from any home, office, or public access point. However, information may not be available during times of system maintenance.

For assistance, visit MarylandComptroller.gov/help or you may contact the Taxpayer Service Section Monday through Friday from 8:30 am until 4:30 pm by phone at 410-260-7980 from central Maryland or 1-800-MDTAXES (1-800-638-2937) from elsewhere. We offer extended taxpayer support during peak filing season. Taxpayers should also visit MyCOMConnect for help with any tax-related issues.