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Phone Numbers by Tax Type Topic Phone Number Toll-Free Number Admissions and Amusement Tax 410-260-7980 from the Baltimore area 1-800-638-2937 from elsewhere in Maryland Alcohol and Tobacco Tax 410-260-7131 from Central Maryland 1-888-784-0142 from elsewhere in Maryland Bulk Sales (on sale of business) 410-767-1579 from the Baltimore area 1-800-492-1751 from elsewhere in Maryland Business Licenses 410-260-6240 from Central Maryland 1-866-239-9359 from elsewhere in Maryland Central Registration Unit (for business taxes) 410-260-7980 from the Baltimore area 1-800-638-2937 from elsewhere in Maryland Corporation Income Tax 410-260-7980 from Central Maryland 1-800-MD-TAXES from elsewhere b-File Assistance 410-260-7980 1-800-638-2937 from elsewhere Corporate Information Reporting 410-767-3015 from Central Maryland Toll-free 1-866-588-2086 Electronic Funds Transfer Information 410-260-7601 (file and pay business taxes by telephone)   Employer Withholding Tax 410-260-7980 from Central Maryland 1-800-638-2937 from elsewhere Estate Tax 410-260-7850 from Central Maryland 1-800-MD TAXES from elsewhere Estimated Income Tax 410-260-7980 from Central Maryland 1-800-MD-TAXES from elsewhere Field Enforcement 410-260-7388 from Central Maryland 1-888-674-0017 Income Tax Refund Information 410-260-7701 from Central Maryland 1-800-218-8160 from elsewhere Income Tax Information 410-260-7980 from Central Maryland 1-800-MD-TAXES from elsewhere Motor Fuel Tax 410-260-7131 from Central Maryland 1-888-784-0142 (licensing) 1-888-784-0141 (IFTA inquiries) Sales and Use Tax 410-260-7980 from the Baltimore area 1-800-638-2937 from elsewhere in Maryland Sales and Use Tax Exemption Certificate Renewals 410-260-7980 from the Baltimore area 1-800-638-2937 from elsewhere in Maryland Tax Clearance Certificate 410-260-7813 from Central Maryland 1-888-784-0144 from elsewhere in Maryland Tire Recycling Fee 410-260-7980 from the Baltimore area 1-800-638-2937 from elsewhere in Maryland Unclaimed Property 410-767-1700 from the Baltimore area 1-800-782-7383 from elsewhere