N.Y. Comp. Codes R. & Regs. tit. 20, § 411.3
(a) In lieu of the bond required by section 411.2 of this Part, an applicant or a distributor may deposit with the Department of Taxation and Finance other security, approved by the department in such amounts as it may require. Among the kinds of security which may be accepted are the following:
(6) other forms of security acceptable to the Department of Taxation and Finance.
(b)
(1) Treasury, State or political subdivision bonds.
(2) Bank passbooks and certificates of deposit. Bank passbooks and certificates of deposit offered as collateral under this section must represent money on deposit with a financial institution approved by the Department of Taxation and Finance. Certificates of deposit must have maturity dates at least one year subsequent to the date of deposit with the Department of Taxation and Finance. Additionally, bank passbooks and certificates of deposit offered under this section must be:
(iii) accompanied by a letter prepared on the letterhead of the bank and signed by an officer of the bank:
(3) Standby letters of credit. Standby letters of credit offered as collateral under this section must:
Tax Law, § 283(3)