N.Y. Comp. Codes R. & Regs. tit. 20, § 172.1
(6) Undeliverable forms IT-2102, IT-2102P and IT-2102G. Any copies of form IT-2102, IT-2102P or IT-2102G which, after reasonable effort, cannot be delivered are to be transmitted with the quarterly combined withholding and wage reporting return covering the second calendar quarter of the following calendar year, on or before July 31st of such year, or with an employer's final return if filed earlier, along with a letter stating that such forms IT-2102, IT-2102P and IT-2102G are undeliverable. Instead of an employer transmitting the undeliverable forms with the quarterly combined withholding and wage reporting return, an employer who issues forms IT-2102 and IT-2102P from branch establishments may, if such employer so desires, have the branch establishments send the undeliverable forms to the New York State Department of Taxation and Finance.
(b) Wages, tips and other compensation to be reported on form IT-2102.
Where form IT-2102 is required to be furnished to an employee, whether the employee is a resident or a nonresident, the total of such employee's wages, tips and other compensation with respect to services performed both within and without New York State must be reported on such form IT-2102.
(c) Specifications for taxpayer-designed forms IT-2102, IT-2102P and IT-2102G.
Employees and payers must comply with the instructions and requirements of the New York State Department of Taxation and Finance with respect to the design and preparation of acceptable substitutes for the official forms IT-2102, IT-2102P and IT-2102G, and the information to be shown therein.
Tax Law, § 672
(a) General.