New York Laws
Part 2 - Returns and Payment of Tax
979 - Report of Change in Federal Taxable Estate, Adjusted Taxable Gifts, Additional Estate Tax Imposed by Section 2032a of the Internal Revenue Code.

(b) Final federal determination. The executor of every estate which is
subject to the United States estate tax shall file with the commissioner
of taxation and finance a copy of the final federal determination
thereof forthwith after the same is made.