RCW 82A.04.210: Base income—Long-term capital gains and losses.

(1) In computing a taxpayer's Washington base income, the taxpayer must deduct from the taxpayer's federal adjusted gross income any long-term capital gains that have been included in computing federal adjusted gross income.

(2) In computing a taxpayer's Washington base income, a taxpayer must add to the taxpayer's federal adjusted gross income any long-term capital losses that have been included in computing federal adjusted gross income.

(3) After making the modifications required under subsections (1) and (2) of this section, in computing a taxpayer's Washington base income, a taxpayer must add to the taxpayer's federal adjusted gross income the amount of Washington capital gains subject to tax under chapter 82.87 RCW for the same taxable year, plus the amount deducted under RCW 82.87.060(1). Under this subsection (3), a taxpayer must not include long-term capital gains or long-term capital losses, from the sales or exchanges exempt under RCW 82.87.050, in the computation of their Washington base income. This subsection (3) applies only to taxpayers owing tax under chapter 82.87 RCW for that taxable year. "Washington capital gains" has the same meaning as provided in RCW 82.87.020.