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Deadline for 2025 Montana Annual Withholding Tax Reconciliation submission extended

January 28, 2026

The Department of Revenue reminds employers that the deadline for submitting their 2025 Montana Annual Withholding Tax Reconciliation (Form MW-3) has been extended.

Because the legal due date of January 31 falls on a Saturday, reports received electronically or postmarked by February 2 will be considered as timely filed.

Here are some reminders to help avoid common mistakes that delay processing

  • Ensure that the correct Federal Employer Identification Number (FEIN) and Montana Withholding account number (WTH) are shown on the MW-3
  • Do not truncate information on the MW-3 or W-2s
  • Provide updates to mailing addresses and other contact information

Please feel free to reach out to the Withholding Unit with any questions at (406) 444-6937 or MTDORWithholding@mt.gov.