Section 617 - Resident partners and shareholders of S corporations(a) Partner's and shareholder's modifications. In determining New York adjusted gross income and New York taxable income of a resident partner or a resident shareholder of an S corporation (other than an S corporation which is a New York C corporation), any modification described in subsections (b), (c) or (d) of section six hundred twelve, subsection (c) of section six hundred fifteen or paragraphs (2) or (3) of subsection (d) of such section, which relates to an item of partnership or S corporation income, gain, loss or deduction shall be made in accordance with the partner's distributive share or the shareholder's pro rata share, for federal income tax purposes, of the item to which the modification relates. Where a partner's distributive share or a shareholder's pro rata share of any such item is not required to be taken into account separately for federal income tax purposes, the partner's or shareholder's share of such item shall be determined in accordance with his share, for federal income tax purposes, of partnership or S corporation taxable income or loss generally. In the case of a New York S termination year, his pro rata share of any such item shall be determined under subsection (s) of section six hundred twelve.(b) Character of items. Each item of partnership and S corporation income, gain, loss, or deduction shall have the same character for a partner or shareholder under this article as for federal income tax purposes. Where an item is not characterized for federal income tax purposes, it shall have the same character for a partner or shareholder as if realized directly from the source from which realized by the partnership or S corporation or incurred in the same manner as incurred by the partnership or S corporation.(c) New York tax avoidance or evasion. Where a partner's distributive share of an item of partnership income, gain, loss or deduction is determined for federal income tax purposes by special provision in the partnership agreement with respect to such item, and where the principal purpose of such provision is the avoidance or evasion of tax under this article, the partner's distributive share of such item, and any modification required with respect thereto, shall be determined as if the partnership agreement made no special provision with respect to such item.