The Tax Department is streamlining withholding tax and wage reporting forms and Web File applications. Contact the Withholding Tax Section at (334) 242-1300 or your local Taxpayer Service Center.Form MW506R may be filed not less than 60 days after the date the tax withheld is paid to the Clerk of the Circuit Court. The Maryland State income tax formula contains a computation for Maryland County tax. Withholding Tax Forms for 2017 Filing Season (Tax Year 2016) (Please note the Office of Tax and Revenue is no longer producing and mailing booklets.