N.Y. State Finance Law § 179-F
2. The required payment date shall be thirty calendar days, excluding legal holidays, provided, however, that for a small business the required payment date shall be fifteen calendar days, excluding legal holidays, absent a showing by the contracting agency of circumstances beyond its control, provided that the small business submits its invoice electronically, in conformance with the policies and procedures of the accounting and financial management system of state government and identifies that it is seeking expedited payment as a small business, or in the case of final payments on highway construction contracts seventy-five calendar days, excluding legal holidays, after receipt of an invoice for the amount of the contract payment due; except when: