Oregon Revised Statutes Revenue and Taxation § 316.124

(1) In determining the adjusted gross income of a nonresident partner of any partnership, there shall be included only that part derived from or connected with sources in this state of the partner's distributive share of items of partnership income, gain, loss and deduction (or item thereof) entering into the federal adjusted gross income of the partner, as such part is determined under rules adopted by the Department of Revenue in accordance with the general rules in ORS 316.127.

(2) In determining the sources of a nonresident partner's income, no effect shall be given to a provision in the partnership agreement which:

(3) Any modification to federal taxable income described in this chapter that relates to an item of partnership income, gain, loss or deduction (or item thereof) shall be made in accordance with the partner's distributive share, for federal income tax purposes of the item to which the modification relates, but limited to the portion of such item derived from or connected with sources in this state.

(4) The department may, on application, authorize the use of such other methods of determining a nonresident partner's portion of partnership items derived from or connected with sources in this state, and the modifications related thereto, as may be appropriate and equitable, on such terms and conditions as it may require.

(5) A nonresident partner's distributive share of items of income, gain, loss or deduction (or item thereof) shall be determined under ORS 314.714 (2). The character of partnership items for a nonresident partner shall be determined under ORS 314.714 (1).