New York Form AO 213 Vendor-TIN Cert is a document used by businesses in New York to certify their Taxpayer Identification Number (TIN). The form is issued by the New York State Department of Taxation and Finance and is required for businesses to register to be able to do business in the state of New York. There are two types of New York Form AO 213 Vendor-TIN Certs: the "New York State Vendor TIN Certification" and the "City of New York Vendor TIN Certification". The New York State Vendor TIN Certification is used to certify the business's TIN to the New York State Department of Taxation and Finance. The City of New York Vendor TIN Certification is for businesses that are located in the City of New York and is used to certify the business's TIN to the City of New York.