Montana Employee’s Withholding and Exemption Certificate (Form MW-4)

January 9, 2024

A completed Form MW-4 is used by employers to determine the amount of Montana income tax to withhold from wages paid. This form allows each employee to claim allowances or an exemption to Montana wage withholding when applicable.

Who should complete Form MW-4?

Complete Form MW-4 and provide to your employer, if you:

  • are a newly hired employee, or
  • claim to be exempt from Montana income tax withholding.

Consider completing a new Form MW-4 if your personal or financial situation changes. If you do not have sufficient income tax withheld from your wages, interest and penalties may be assessed when you file your individual income tax return.