(Tax Law, section 213-b(i))
The commissioner may grant a reasonable extension of time, not to exceed six months, for payment of any installment of estimated tax upon receipt of a written request from the taxpayer giving complete information as to the reasons for its inability to pay the installment on or before the prescribed due date. As a condition for granting an extension of time, the commissioner may require the taxpayer to furnish a bond or other security in an amount not to exceed twice the amount of the installment. Interest must be paid from the original due date of the installment, without regard to any extension, to the date of payment.
N.Y. Comp. Codes R. & Regs. Tit. 20 §§ 7-3.8