(a) The basic tax is measured by entire net income, or the portion thereof allocated to New York State, and is the measure of the tax unless the computation of the alternative minimum tax produces a greater amount of tax. The basic tax is computed by multiplying entire net income, or the portion thereof allocated to New York State, by the tax rate of nine percent.
(b) The portion of entire net income allocated to New York State is determined pursuant to Subpart 19-2 of this Title Allocation of Entire Net Income.