A Certificate of Authority is a document authorizing a business or nonprofit to operate in a state other than its state of incorporation. As an example, a Michigan formed LLC will need an Ohio Certificate of Authority if it is doing business in Ohio. 

Each state has their own Certificate of Authority, and each state’s requirements will vary. Typically, the Certificate of Authority will only require very basic information about the entity that can easily be found in its Articles of Incorporation or their equivalent. Many states, including Michigan, also require the submission of a Certificate of Good Standing from the entity’s state of incorporation when applying for a Certificate of Authority.