Tax Law, § 612(q)
Where a taxpayer deferred an amount under section 612(p) of the Tax Law, as such section was in effect for taxable years beginning before 1988, such amount must be added to Federal adjusted gross income when the reinvestment in the New York new business, which qualified the taxpayer for such deferral, is sold.
N.Y. Comp. Codes R. & Regs. Tit. 20 § 112.10