Complete Form MW507 so that your employer can withhold the correct. Maryland income tax from your pay.Employee's Withholding Certificate. 2024. The Maryland Form MW 507, Employee's Maryland Withholding Exemption Certificate, must be completed so that you know how much state income tax to withhold. All Maryland residents or employees must complete form MW507 to ensure their employer withholds the correct amount from their paycheck. View the Instructions for Completing Withholding Forms for Maryland State Employees in our extensive collection of PDFs and resources. Employee's Maryland Withholding Exemption Certificate. FORM. MW507. This file provides essential instructions for completing withholding forms for Maryland state employees. What is the MD Withholding Exemption Certificate? Complete Form MW507 so that your employer can withhold the correct Maryland income tax from your pay.