MT CIT Information

The corporate income tax is a franchise tax levied on corporations for the privilege of doing business in Montana. Corporations conducting business that is taxable both within and without the state (multi-state corporations) are required to allocate income to Montana based on an equally-weighted, three-factor apportionment formula, where sales, property and payroll are the three factors. Banks and savings and loan associations are treated for corporate tax purposes similar to other corporations, except that 80% of the tax they pay is returned to the counties in which the bank or savings and loan association is located. This allocation was designed to reimburse local governments for revenue lost when the property tax on bank shares was repealed in 1979.

Link to official form info:

Link to official form info for CIT

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To access the official link to form MT CIT and get reminded when it's due, sign up for a free Tax Reminder account:

  • Upcoming Due Dates in the Next Year:*
  • Monday Mar 17, 2025
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    * Due dates are based on the filing requirements for this form and may vary depending on your tax year.

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