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Montana S Corporation Information and Composite Tax Return (CLT-4S)

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MT CLT-4S Information

Every corporation engaged in business in the State of Montana—unless expressly exempted under 15-31-102(1), MCA—has to file an annual Montana Corporate Income Tax Return. The term “corporation” includes associations, joint stock companies, limited liability companies that are taxed as C corporations for federal income tax purposes, and common law trusts and business trusts that do business in an organized capacity, whether or not under and pursuant to state laws, agreements or declarations of trust. Please see 15-31-101, MCA. An S corporation has to file an S Corporation Information and Composite Tax Return, CLT-4S.

Link to official form info:

Link to official form info for CLT-4S

Tax Reminder works year round to keep official tax form info up-to-date for Montana and the rest of the USA. The IRS and states change their forms often, so we do the hard work for you of figuring out where the official form info is located.

To access the official link to form MT CLT-4S and get reminded when it's due, sign up for a free Tax Reminder account:

  • Upcoming Due Dates in the Next Year:*
  • Monday Mar 15, 2027

  • Create a free account to see exactly when to file this form, receive email or SMS notification reminders, and to keep a record of filing it in your history.
    * Due dates are based on the filing requirements for this form and may vary depending on your tax year.

Never forget to file MT CLT-4S again.

15 Montana Tax Filings & Forms:

2EZ - Individual Income Tax Return 2M - Individual Income Tax Return 2/Schedule IV - Individual Income Tax Return (part year, nonresident) CIT - Corporate Income Tax Return CLT-4S - S Corporation Information and Composite Tax Return PR-1 - Partnership Information and Composite Tax Return UI-5 - Employer’s Unemployment Insurance (UI) Quarterly Wage Report TPT-1 - Transaction, Privilege, Use & Severance Tax Return MW-3 - Montana Annual Wage Withholding Tax Reconciliation MW-1 - Withholding Tax Payment Voucher MW-1 - Withholding Tax Payment Voucher G-RP-1 - Gallatin County Real Property Tax - First Half Due G-RP-2 - Gallatin County Real Property Tax - Second Half Due G-MH-2 - Gallatin County Mobile Home Tax - Second Half Due G-MH-1 - Gallatin County Mobile Home Tax - First Half Due
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