This guide is an overview of registering your business for Montana state payroll taxes. For more support, contact the state agency directly.
This guide includes key payroll tax requirements, links to state agency portals, and instructions for granting third-party access to Wave's partner. These steps are required to complete your tax profile in Wave so we can manage your payroll tax payments and filings on your behalf.
Tax requirements
To pay employees in Montana, you may need to register for the following taxes:
Montana Withholding Tax
Employers must register with the Department of Revenue as a Withholding Tax Agent to withhold state income taxes from employees.
- Tax agency: Montana Department of Revenue
- Registration Portal: Register online via Montana TAP
After registering and receiving your Account ID, go back to Montana TAP to create a Montana TAP Online Account.
Montana Unemployment Insurance (UI) Tax
Employers must register for unemployment insurance with the CDLE.
- Tax agency: Montana Department of Labor & Industry
- Registration Portal: Register online at UIServices for Employers.
After registering, return to UIServices to create a UIServices Online Account.
Third-Party Administrator (TPA) access
UI TPA access
To enable filing and paying on your behalf for UI:
- Complete the Third Party Authorization Form (UI006).
- Upload it to UI eServices.
This form is part of the employer onboarding process.
Complete your payroll tax profile
After completing the registration steps, complete your payroll tax profile. Be sure to update your account with your:
- Montana Withholding Account ID
- Montana UI Employer Account Number (EAN)
Additional Support
For help with your tax account, registration, or technical errors, contact the state agency directly:
- Withholding (DOR): (406) 444-6900
- Unemployment (DLI): (406) 444-3834