N.Y. Comp. Codes R. & Regs. tit. 20, § 2397.7
(2) Certified check taxpayers.The mailing rules specified in sections 289-d, 315 and 1147 of theTax Law and regulations promulgated thereunder shall be applicableto payments made by taxpayers electing the certified check paymentoption and mailing such certified checks and accompanying completedtransmittal forms to the department's depository bank, subjectto the proviso that the taxpayer must mail its certified check forthe tax liability on or before the second business day prior to theapplicable due date.
(b)
(3) Grounds for reasonablecause. The following exemplify grounds for reasonable cause and absenceof willful neglect, where clearly established by or on behalf of thetaxpayer:
(a) Mailing rules.