📝 Overview
This guide covers state tax information for employers running payroll in Montana. Use the sections below to find agency contact information, supported tax filings, and the account details required for tax setup.
⚙️ Montana Tax Information
Click the arrow to view Withholding information
Click the arrow to view Withholding information
Agency Information
Website: Montana Department of Revenue
Phone: (406) 444-6937
Supported Tax Filings
Montana Withholding Tax Payment Voucher (Form MW-1)
Employee Wage and Tax Statement (W-2)
Required for Tax Setup
Withholding Account Number (10 digits with suffix, e.g., 1234567-891-WTH)
Filing Frequency (Quarter-monthly, Monthly, Quarterly, or Annually)
Click the arrow to view Unemployment Insurance information
Click the arrow to view Unemployment Insurance information
Agency Information
Website: Montana Department of Labor & Industry
Phone: (406) 444-3834
Supported Tax Filings
Employer's Unemployment Insurance Quarterly Wage Report (UI-5)
Required for Tax Setup
Unemployment Account Number (7 digits, e.g., 123 4567)
Unemployment Insurance Base Tax Rate (X.X%)
❓ Frequently Asked Questions (FAQs)
Find answers to common questions or additional details that may not be covered in the main instructions.
Click the arrow to view frequently asked questions
Click the arrow to view frequently asked questions
Where do I find my Montana withholding account number?
Click the arrow to see the answer
Click the arrow to see the answer
Your Montana withholding account number is assigned by the Montana Department of Revenue when you register. It is formatted as 1234567-891-WTH and can be found on agency correspondence or by logging into your Montana TAP account at tap.dor.mt.gov.
Does Montana use the same portal for new employer registration and ongoing access?
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Click the arrow to see the answer
Yes. For withholding, both registration and account access are handled through the Montana TAP portal at tap.dor.mt.gov. For unemployment insurance, both registration and ongoing access use the Montana UI eServices portal, accessed through the Montana government Okta login.
How do I find my Montana unemployment account number and base tax rate?
Click the arrow to see the answer
Click the arrow to see the answer
Your unemployment account number and base tax rate are assigned by the Montana Department of Labor and Industry when you register. Your rate is included in an annual rate notice. If you need to look these up, log into your Montana UI eServices account or contact the agency at (406) 444-3834.