N.Y. Comp. Codes R. & Regs. tit. 20, § 4-6.2
(b) The taxpayer applying for the discretionary adjustment described in subdivision (a) of this section must annually file its report and calculate its business allocation percentage and alternative business allocation percentage using the statutory formulas described in sections 4-2.2 of this Part and 210(3-a)(a) of the Tax Law, respectively. It must attach a statement to the report setting forth:
(2) the items of its business expenses, other than salaries and wages, incurred or expended within New York State together with the items of such expenses incurred or expended within and without New York State.
The commissioner may require any corporation to provide under oath any additional information the commissioner deems necessary to make such adjustment.
(c) The term business expenses includes only expenses used in the calculation of the taxpayer's entire net income which are incurred or expended in service, maintenance and operation and which are of a nature as may be allocated within and without the State, such as:
(d) The term business expenses does not include:
Tax Law, § 210(8)