N.Y.C. Admin. Code § 11-102.1: § 11-102.1 Authorization to require identifying numbers.

a. The commissioner of finance in the proper discharge of his duties in the administration and collection of taxes, assessments, arrears or other charges payable to the city may require any person to furnish such identifying number as the commissioner may prescribe for securing proper identification of such person, including but not limited to a social security account number or federal employer identification number.

b. Any person who fails to supply such identifying number within thirty days after written demand therefor shall be liable for a civil penalty of not more than one thousand dollars. Upon application in writing and for good cause shown, the commissioner of finance may extend the time for compliance with such written demand.

c. The civil penalty prescribed by this section shall be recovered by the corporation counsel in an action or proceeding in any court of competent jurisdiction. In addition, the corporation counsel may institute any other action or proceeding in any court of competent jurisdiction that may be appropriate or necessary for the enforcement of the provisions of this section.