Home Tax Professionals Contact Information for Vendors and Developers Contact Information for Vendors and Developers Submitting Software Vendor Forms Prior to submitting paper forms for approval please complete the Comptroller of Maryland Substitute Paper Vendor Contact Information Form and return it to us at: mdsoftwaredevelopers@marylandtaxes.gov. eFile Program and Record Specifications Contact the eFile Help Desk at 410-260-7753 or by email at efil@marylandtaxes.gov. Paper Forms, Barcodes & Substitute Forms Contact the Forms Manager at 410-260-6395 or email mdsoftwaredevelopers@marylandtaxes.gov.