Do it by#

• Do it by Thu, Jan 30.
• Due 1 day later (Fri, Jan 31).
• Allow 1 day, for postal pickup.

Submission #

Manual

• Paper: Letter (8.5in x 11in)
• Copies to print: 2
• Employers can also submit reports online.
• Employers must submit this form along with W-2s and/or 1099s.
• Write the business name, FEIN, Maryland withholding CR Number, NAICS code and phone number on all documents.
• Mail to:

  Comptroller of Maryland
  Revenue Administration Division
  110 Carroll Street
  Annapolis MD  21411-0001
  

Online

• Login: https://interactive.marylandtaxes.com/Business/bFile/OSC/Logon.aspx
• Register: https://interactive.marylandtaxes.com/Business/bFile/OSC/UserLogonNew.aspx

Employers must submit this form along with W-2s and/or 1099s.

Payment #

Payable to "Comptroller of Maryland, Withholding Tax"

• on or before January 31st of the succeeding calendar year.
• If the due date falls on a Saturday, Sunday or legal holiday, it must be submitted on the first working day AFTER.

Notes#

Manual

• Employers with 25 or more employees must file this return online.
• Do not adjust prior quarter wages on this report.
• Employers filing this form online, do not need to submit a paper return.

Online

• Employers with 25 or more employees must file this return online.
• Do not adjust prior quarter wages on this report.
• Employers filing this form online, do not need to submit a paper return.

Purpose#

• To report a reconciliation of tax withheld during the year.

2019 Annual submission dates. md-a-w3#

Due For period starting
1. Fri, Jan 31, 2020Tue, Jan 1, 2019

2018 Annual submission dates. md-a-w3#

Due For period starting
1. Thu, Jan 31, 2019Mon, Jan 1, 2018

2017 Annual submission dates. md-a-w3#

Due For period starting
1. Wed, Jan 31, 2018Sun, Jan 1, 2017

Learn more#

• Maryland employer withholding guide
• Filing business tax electronically

Contact#

• Comptroller of Maryland, Revenue Administration Division
  
• (410) 260-7980
• Email: taxhelp@comp.state.md.us
• http://taxes.marylandtaxes.com/Resource_Library/Taxpayer_Assistance/Contact_Information/Contacts_by_Topic/Contact_Taxpayer_Service.shtml

Download#

• http://forms.marylandtaxes.gov/18_forms/MW508.pdf