N.Y. Comp. Codes R. & Regs. tit. 20, § 4-9.1 – General.

(a) Business capital allocable to New York State is computed by multiplying business capital by the business allocation percentage. Investment capital allocable to New York State is computed by multiplying investment capital by the investment allocation percentage. The sum of the products is the taxpayer's total business and investment capital allocable to New York State.