(2) A credit against the tax otherwise due under this chapter shall be allowed to the taxpayer for the amount of any taxes imposed on the taxpayer by another state of the United States, a foreign country or the District of Columbia which tax is attributable to gain that is subject to tax as described in subsection (1) of this section.
(3) The amount of the credit allowed under subsection (2) of this section may not exceed the amount of the gain taxed by the other taxing jurisdiction multiplied by eight percent.
(4) The Department of Revenue shall provide by rule the procedure for obtaining credit provided by subsection (2) of this section and the proof required. The requirement of proof may be waived partially, conditionally or absolutely, as provided under ORS 315.063.
(5) Any credit allowed under subsection (2) of this section may not be applied in calculating tax due under this chapter if the tax upon which the credit is based has been claimed as a deduction for Oregon personal income tax purposes, unless the tax is restored to income on the Oregon return. [1979 c.579 §2; 1981 c.705 §2; 1995 c.54 §10; 2001 c.114 §36]