Deductions.
RCW 82.87.060
in effectIn computing tax for a taxable year, a taxpayer may deduct from his or her Washington capital gains: (1) A standard deduction of $250,000 per individual, or in the case of spouses or domestic partners, their combined standard deduction is limited to $250,000, regardless of whether they file joint or separate returns. The amount of the standard deduction shall be adjusted pursuant to RCW 82.87.150 ; (2) Amounts that the state is prohibited from taxing under the Constitution of this state or the Constitution or laws of the United States; (3) The amount of adjusted capital gain derived from the sale or transfer of the taxpayer's interest in a qualified family-owned small business pursuant to RCW 82.87.070 ; and (4) Charitable donations deductible under RCW 82.87.080 .
In computing tax for a taxable year, a taxpayer may deduct from his or her Washington capital gains:
(1) A standard deduction of $250,000 per individual, or in the case of spouses or domestic partners, their combined standard deduction is limited to $250,000, regardless of whether they file joint or separate returns. The amount of the standard deduction shall be adjusted pursuant to RCW 82.87.150 ;
(2) Amounts that the state is prohibited from taxing under the Constitution of this state or the Constitution or laws of the United States;
(3) The amount of adjusted capital gain derived from the sale or transfer of the taxpayer's interest in a qualified family-owned small business pursuant to RCW 82.87.070 ; and
(4) Charitable donations deductible under RCW 82.87.080 .
Source: WA Statutes (Official Site)URL: https://app.leg.wa.gov/RCW/default.aspx?cite=82.87&full=trueFetched: 6/29/2026