Form a corporation, limited liability company (LLCs), limited partnership or more and do business in New York State. How do I form a business corporation?Please enclose documents supporting: (A) the existence of the legal entity. (e.g. The filer must submit a completed Professional Corporations Corporate Contact Information Form. File Form 1128 to request a change in tax year. Partnerships, S corporations, personal service corporations (PSCs), or trusts may be required to file Form.