The Secretary of State FAQ web page indicates that domestic corporations or LLCs must file annual reports by November 28 to avoid involuntary dissolution.  Foreign corporations and LLCs were required to file by October 31 to avoid involuntary revocation.  CSC can help with your filing needs, contact a CSC representative by calling 877-463-5769.

Montana – File annual reports for certain entities by November 28 to avoid involuntary dissolution
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