(Tax Law, section 213-a(h))
The Commissioner may grant a reasonable extension of time, not to exceed three months, for the filing of any declaration of estimated tax upon receipt of a written request from the taxpayer giving complete information as to the reasons for its inability to file the declaration on or before the prescribed due date.
N.Y. Comp. Codes R. & Regs. Tit. 20 §§ 7-2.6