Montana
Last Updated June 17, 2026.
Montana employers must comply with state payroll tax withholding and unemployment insurance requirements. The resources below provide access to agency contacts, forms, and registration information.
State Tax Guidelines
Montana Department of Revenue – Withholding Tax
Agency Information
Add to existing company setup
Submit a request to your service team to add MT (withholding to your company setup. Please include the below with your request:
- Withholding – Withholding account number and Deposit Frequency. If you’re unsure of your deposit frequency or account number you can call the agency at 406-444-6900.
Register a new company
Employers can register online at https://uieservices.mt.gov/TUP/TAP/_/. Select the Sign Up Now! Icon at the bottom of the page. Follow the prompts to register your business. Once completed you will receive your account number and deposit frequency within 10 – 14 days via mail. You can contact the agency at 406-444-6900 after 2 days to obtain your account number over the phone.
Montana Department of Labor and Industry – Unemployment tax
Agency Information
Add to existing company setup
Submit a request to your service team to add MTSUI (unemployment) to your company setup. Please include the below with your request:
- Unemployment – Account Number and Tax rate. This can be found on a Tax Rate Notice or the Quarterly contribution report. If you’re unsure of your tax rate or account number, you can call the agency at 406-444-3834.
Register a new company
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