How is a Professional Corporation or PLLC formed?

To register Professional Corporation the formation documents, the articles of incorporation for a PC, the proper state licensing body must often approve the formation documents before these documents can be filed with the Secretary of State. Further, the formation documents typically must contain the signature of a licensed professional as the incorporator, and that person's license number typically is required. Therefore, the filing time for professional entities is longer than the filing time for standard business entities.
To form professional corporation may be by filing a Certificate of Incorporation pursuant of the Business Corporation Law, includes any practice as an attorney and counselor-at-law, or as a licensed physician, and those occupations designated in Title Education Law (For a listing of professional services)
To start professional corporation a Certificate of Good Standing from the appropriate Division or a Certificate of Authority under seal from the State Department of Education, Division of Professional Licensing Services, must be submitted with the Certificate of Incorporation.

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Source: Business Document Filing in All 50 States.