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FAQ
  Michigan Business Tax
Mi44. Does the MBT follow the federal check-the-box regulations?
 
Answer:

Yes.  Effective January 1, 1997, a separate business entity that is not required to be classified as a corporation for tax purposes is permitted to elect its entity classification under the federal "check-the-box" provisions of the Federal Income Tax Regulations, Treas Reg ยง 301.7701-3.  These check-the-box regulations allow an unincorporated entity, such as a limited liability company ("LLC"), to elect to be taxed as a corporation.  An unincorporated entity with at least two members that fails to elect corporate tax treatment will, by default, be taxed as a partnership.  An unincorporated entity with one member that fails to elect corporate tax treatment will, by default, be disregarded as an entity separate from its owner for federal tax purposes.  A single member entity, such as a single member LLC ("SMLLC"), that is disregarded for federal tax purposes will be treated as a sole proprietorship, branch, or division of its owner.

For MBT purposes, a person is defined in MCL 208.1113(3) to include various types of entities, including partnerships, corporations, and LLCs.  An entity that has elected or is required to file as a corporation or partnership under the Internal Revenue Code is by definition a corporation or partnership under the MBT act.  MCL 208.1107(3) and 208.1113(2).  These statutory definitions effectively adopt the federal check-the-box regulations for MBT purposes.

If a SMLLC or other entity is a disregarded entity for federal tax purposes, the SMLLC or other entity will be similarly classified as a disregarded entity for MBT purposes.  Consequently, the owner of the SMLLC or other entity is the MBT taxpayer, with the SMLLC or other entity treated as either a sole proprietorship or as a branch or division of its owner.  MCL 208.1512(1).  See Notice to Taxpayers Regarding Federally Disregarded Entities and the Michigan Business Tax, issued January 26, 2012, for further details and exceptions.