Tax Law, § 671(b)(2)(C)
In addition to the wages subject to withholding of New York State personal income tax under this Part, any payment of an annuity made by a payer maintaining an office or transacting business in New York State to an individual, to the extent includible in such individual's New York adjusted gross income, must be treated as if it were a payment of wages by an employer to an employee for a payroll period if, at the time the payment is made, a request that such annuity be subject to withholding of New York State personal income tax under this Part is in effect.
A request to deduct and withhold New York State personal income tax on annuity payments should be made by the payee by completing form IT-2104P, Annuitant's Request for Income Tax Withholding, in accordance with instructions applicable thereto. In lieu of form IT-2104P, payers may prepare and use a form, the provisions of which are identical to form IT-2104P. The request to deduct and withhold New York State personal income tax is to be made in a specific dollar amount which must be at least $5 per month and may not reduce the net amount of any annuity payment received by the payee below $10.
Upon receipt of a request under this section to withhold New York State personal income tax on annuity payments, the payer of such annuity payments must deduct and withhold the amount specified in such request (see subdivision [c] of this section for restrictions relating to the amount of New York State personal income tax which may be deducted and withheld from annuity payments) from such annuity payments commencing with the first annuity payment made on or after the date which occurs:
A request under this section will remain in effect until terminated by the payee. The payee may terminate the request by furnishing the payer a signed written notice of termination. Such notice of termination, except as hereinafter provided, is effective with respect to the first payment of an annuity made on or after the first status determination date (January 1st, May 1st, July 1st and October 1st of each year) which occurs at least 30 days after the date on which such notice of termination is furnished. However, the payer may elect to terminate withholding of New York State personal income tax with an annuity payment made on or after the date the termination notice is furnished and before the status determination date.
N.Y. Comp. Codes R. & Regs. Tit. 20 § 171.10