(2) Subsection (1) of this section shall not apply to an organization described in section 501(c)(1) of the Internal Revenue Code.
(3) In the case of unrelated business income of a private foundation described in section 509 of the Internal Revenue Code, the first quarter of estimated tax due under ORS 314.515 (1)(a) shall be paid on or before the 15th day of the fifth month of the taxable year. [1959 c.356 §2; 1975 c.652 §90; 1983 c.162 §42; 1985 c.802 §28b; 1987 c.293 §48; 1997 c.839 §37; 1999 c.90 §25a]