Washington Capital Gains Tax: Resolution Strategies for UHNWI Investors

Last Updated: October 5, 2026

Next Scheduled Review: October 2027

Key Takeaways

Washington imposes a 7% capital gains excise tax on long-term capital gains exceeding the inflation-adjusted standard deduction under RCW 82.87.040, with a 9.9% tier on taxable Washington capital gains exceeding $1 million effective retroactively to January 1, 2025, under SB 5813.
The standard deduction for tax year 2025 is $278,000**, adjusted annually for inflation under **RCW 82.87.150**, meaning the 9.9% tier begins above **$1,278,000 of Washington-allocated nonexempt gain.
Intangible personal property gains are allocated to Washington if the taxpayer was domiciled in Washington at the time of sale under RCW 82.87.100(1)(b), while tangible personal property gains are allocated based on location at the time of sale.
Real estate gains are exempt from the capital gains excise tax under RCW 82.87.050, including gains passed through from entities to the extent directly attributable to real estate owned by the entity.
A nonrefundable credit is allowed under RCW 82.87.100(2) for legally imposed income or excise tax paid to another taxing jurisdiction on the same capital gains, with no carryback or carryforward of unused credits.

Direct answer: The Washington capital gains excise tax is imposed under RCW 82.87.040 on individuals with Washington capital gains exceeding the inflation-adjusted standard deduction, which is $278,000 for tax year 2025. The tax is allocated to Washington under RCW 82.87.100 based on either the location of tangible property or the taxpayer’s domicile for intangible property, with a 7% rate up to $1 million and a 9.9% rate above that threshold.

Cite This Article

Goldstein, A. (2026). Washington Capital Gains Tax: Resolution Strategies for UHNWI Investors. [Publication Name].

Alan Goldstein, “Washington Capital Gains Tax: Resolution Strategies for UHNWI Investors,” [Publication Name] (Oct. 5, 2026).

Introduction

Washington imposes a unique capital gains excise tax that functions as the state’s primary income-adjacent tax on ultra-high-net-worth individuals (“UHNWIs”). Washington has no personal income tax and no income tax residency test. However, the capital gains excise tax creates significant compliance and audit exposure for UHNWIs who sell stock, business interests, or other intangible assets. The controlling authority is RCW Chapter 82.87, implemented through WAC 458-20-300 and WAC 458-20-301. The tax was enacted in 2021 and upheld as a constitutional excise tax by the Washington Supreme Court in Quinn v. State, 200 Wn.2d 1 (2023). The Washington State Department of Revenue (DOR) administers the tax, and the Washington Board of Tax Appeals provides administrative review. For UHNWIs with multistate interests, the allocation and sourcing rules under RCW 82.87.100 are the central audit battlegrounds.

What Is the Washington Capital Gains Excise Tax?

Direct answer: The Washington capital gains excise tax is a 7% tax imposed under RCW 82.87.040 on the sale or exchange of long-term capital assets by individuals, with a 9.9% tier on taxable Washington capital gains exceeding $1 million. The tax applies to Washington capital gains exceeding the inflation-adjusted standard deduction, which is $278,000 for tax year 2025.

Statutory Basis

Direct answer: The operative statute is RCW 82.87.040, which imposes the tax on individuals for the privilege of selling or exchanging long-term capital assets. RCW 82.87.100 provides allocation rules and a credit for taxes paid to other jurisdictions. RCW 82.87.020 defines Washington capital gains, and RCW 82.87.060 provides deductions including the standard deduction.

RCW 82.87.040 imposes the capital gains excise tax at 7% of Washington capital gains, with the additional 2.9% tier for gains exceeding $1 million added by SB 5813 in 2025. RCW 82.87.100(1) provides the allocation rules: tangible personal property is allocated to Washington if located in the state at the time of sale, and intangible personal property is allocated to Washington if the taxpayer was domiciled in Washington at the time of sale. RCW 82.87.020(1) defines Washington capital gains as federal net long-term capital gain with adjustments to remove gains and losses allocated outside Washington. RCW 82.87.060 provides deductions including the standard deduction, which is adjusted annually for inflation under RCW 82.87.150.

Historical Development

Direct answer: Washington enacted the capital gains excise tax in 2021 under SB 5096, effective January 1, 2022. The tax was challenged in Douglas County Superior Court, which ruled it unconstitutional in March 2022. The Washington Supreme Court reversed in March 2023 in Quinn v. State, holding the tax is a valid excise tax. SB 5813 added the 9.9% tier in 2025.

Washington enacted the capital gains excise tax in 2021 through SB 5096, effective for transactions occurring on or after January 1, 2022. The tax was immediately challenged in Quinn v. State of Washington, and the Douglas County Superior Court ruled it unconstitutional in March 2022, characterizing it as an income tax. The Washington Supreme Court reversed in a 7-2 decision on March 24, 2023, holding the tax is a valid excise tax on the sale or exchange of capital assets. The U.S. Supreme Court denied certiorari on January 16, 2024, letting the Washington Supreme Court’s decision stand. SB 5813, enacted in May 2025, added the 9.9% tier for taxable Washington capital gains exceeding $1 million, effective retroactively to January 1, 2025.

Current Scope

Direct answer: The Washington capital gains excise tax applies to individuals with Washington capital gains exceeding the inflation-adjusted standard deduction, which is $278,000 for tax year 2025. The tax applies to gains from sales of tangible personal property located in Washington and intangible personal property if the taxpayer was domiciled in Washington at the time of sale. Real estate is exempt.

The tax applies to individuals only, not business entities. However, gains passed through from pass-through entities such as S corporations, partnerships, LLCs, and grantor trusts flow through to individual owners. Real estate is exempt from the tax under RCW 82.87.050, including gains passed through from entities to the extent directly attributable to real estate. Qualified family-owned small business gains are deductible under RCW 82.87.070 if the taxpayer or family member materially participated in the business for at least five years immediately preceding the sale. Charitable donations exceeding $250,000 (the statutory minimum) are deductible under RCW 82.87.080.

Entity Reference Table

Entity	Full Name	Type	Binding Effect	Role in This Article
WA DOR	Washington State Department of Revenue	State administrative agency	Binds Washington taxpayers; persuasive in WA courts	Administers and enforces the capital gains excise tax
WA Board of Tax Appeals	Washington State Board of Tax Appeals	State tribunal	Binds DOR on remand; persuasive in WA courts	Hears appeals of DOR capital gains tax determinations
WA Courts	Washington State Courts	Judicial authority	Binding on all parties	Review DOR and Board decisions
RCW 82.87	Revised Code of Washington, Chapter 82.87	Primary statutory authority	Binds all Washington taxpayers and agencies	Source of the capital gains excise tax
WAC 458-20-300/301	Washington Administrative Code	Primary regulatory authority	Binds DOR; subject to judicial review	DOR rules implementing the capital gains excise tax
U.S. Constitution	United States Constitution	Federal constitutional authority	Binds Washington taxing authorities	Limits state taxation under Due Process and Commerce Clauses

Binding Effect and Legal Weight

Direct answer: RCW 82.87.040 is primary statutory authority binding on the Washington State Department of Revenue, all individual taxpayers, and Washington courts. WAC 458-20-300 and WAC 458-20-301 are primary regulatory authority binding on the DOR but subject to judicial review. DOR guidance and publications are secondary authority. Washington Supreme Court decisions are binding on all parties.

Who Is Bound

Direct answer: Washington’s capital gains excise tax statute binds the DOR, all individuals with Washington capital gains, and Washington courts. The taxpayer bears the burden of proving that a DOR assessment is erroneous. The DOR administers the tax through federal data matching and requires taxpayers to maintain documentation for at least four years from the date of sale.

RCW 82.87.040 binds the DOR and all individual taxpayers. RCW 82.87.110 requires taxpayers to include a copy of their federal income tax return with their Washington capital gains tax return, and the DOR uses federal data matching to identify noncompliance. WAC 458-20-300 provides that in the event of an audit, the taxpayer must provide documentation to support the selling price or any exemption claimed, and this documentation must be maintained for a minimum of four years from the date of sale. The DOR’s determination on audit is presumptively correct, and the taxpayer bears the burden of proof in administrative appeals.

Precedential Value

Direct answer: Washington Supreme Court decisions are binding on all parties and establish the controlling interpretation of the capital gains excise tax. The Quinn v. State decision, 200 Wn.2d 1 (2023), is the controlling authority holding the tax is a constitutional excise tax. Washington Board of Tax Appeals decisions are persuasive but not binding precedent.

The Washington Supreme Court decision in Quinn v. State, 200 Wn.2d 1 (2023), is the controlling judicial authority holding the capital gains excise tax is a valid excise tax and not an income tax prohibited by the Washington Constitution. The U.S. Supreme Court denied certiorari on January 16, 2024, leaving the Quinn decision intact. Washington Board of Tax Appeals decisions are persuasive but are not binding precedent in Washington courts. The DOR issues binding rulings upon request and nonbinding answers to general questions, with responses expected within 30 days.

Primary vs. Secondary Authority

Direct answer: RCW Chapter 82.87 is primary statutory authority. WAC 458-20-300 and WAC 458-20-301 are primary regulatory authority. DOR publications and special notices are secondary authority. Washington Supreme Court decisions are primary judicial authority. Board of Tax Appeals decisions are primary authority as administrative adjudications.

RCW 82.87.040, RCW 82.87.100, and RCW 82.87.020 are the primary statutory authorities. WAC 458-20-300 (Overview and Administration) and WAC 458-20-301 (Definitions, Deductions, Exemptions, and Allocation of Gains and Losses) are the primary regulatory authorities, adopted June 28, 2024, and effective July 29, 2024. DOR Special Notices and publications are secondary authority. Quinn v. State, 200 Wn.2d 1 (2023), is primary judicial authority.

Key Authorities and Cases

Direct answer: The controlling statutory authority for the Washington capital gains excise tax is RCW 82.87.040, with allocation rules in RCW 82.87.100 and definitions in RCW 82.87.020. The controlling judicial authority is Quinn v. State, 200 Wn.2d 1 (2023). The implementing regulations are WAC 458-20-300 and WAC 458-20-301.

Washington Statutory Authority

RCW 82.87.040 imposes the tax at 7% on Washington capital gains, with the 9.9% tier for gains exceeding $1 million added by SB 5813. RCW 82.87.100(1)(a) allocates tangible personal property gains to Washington if the property was located in the state at the time of sale, or if the property was located in Washington at any time during the taxable year of sale or the immediately preceding taxable year, the taxpayer was a resident at the time of sale, and the taxpayer is not subject to income or excise tax on the gains by another taxing jurisdiction. RCW 82.87.100(1)(b) allocates intangible personal property gains to Washington if the taxpayer was domiciled in Washington at the time of the sale or exchange. RCW 82.87.100(2) provides a credit against the tax for legally imposed income or excise tax paid to another taxing jurisdiction on the same capital gains, with no carryback or carryforward of unused credits.

Washington Regulations and Guidance

WAC 458-20-300 provides an overview of the capital gains excise tax, including imposition, returns, extensions, payment, penalties, interest, and general administration. WAC 458-20-301 provides definitions, deductions, exemptions, and allocation of gains and losses, adopted June 28, 2024, and effective July 29, 2024. WAC 458-20-301 includes examples of the DOR’s interpretation of pass-through entity allocation, including the treatment of holding company LLCs that own both real estate and other assets. DOR Special Notice: New tiered rates for Washington’s capital gains tax provides guidance on the 7% and 9.9% rate structure effective for tax year 2025.

Judicial Decisions

Quinn v. State, 200 Wn.2d 1 (2023), is the controlling judicial decision. In a 7-2 decision, the Washington Supreme Court held that the capital gains excise tax is a valid excise tax on the sale or exchange of capital assets, not an income tax prohibited under the Washington Constitution. The Court emphasized that the tax is levied on the privilege of selling or exchanging capital assets, not on the ownership of property or the receipt of income. The U.S. Supreme Court denied certiorari on January 16, 2024. The Douglas County Superior Court had previously ruled the tax unconstitutional in March 2022, but that decision was reversed.

Summary Table of Authorities

Authority	Full Citation	Type	Jurisdiction	Key Holding
Capital Gains Tax Imposition	RCW 82.87.040	Statute	Washington	Imposes 7% tax on Washington capital gains
9.9% Tier	SB 5813 (2025)	Legislation	Washington	Adds 2.9% tier for gains exceeding $1 million
Allocation Rules	RCW 82.87.100	Statute	Washington	Tangible property by location; intangibles by domicile
Credit Provision	RCW 82.87.100(2)	Statute	Washington	Credit for taxes paid to other jurisdictions
Standard Deduction	RCW 82.87.060	Statute	Washington	$278,000 for 2025, inflation-adjusted
Real Estate Exemption	RCW 82.87.050	Statute	Washington	Real estate gains exempt from tax
Family Business Deduction	RCW 82.87.070	Statute	Washington	Deduction for qualified family-owned small business
Charitable Deduction	RCW 82.87.080	Statute	Washington	Deduction for charitable donations above $250,000 floor
Overview Regulation	WAC 458-20-300	Regulation	Washington	Overview and administration of the tax
Definitions Regulation	WAC 458-20-301	Regulation	Washington	Definitions, deductions, exemptions, allocation
Constitutional Challenge	Quinn v. State, 200 Wn.2d 1 (2023)	Case	Washington	Tax is valid excise tax, not income tax
Certiorari Denial	Quinn v. Washington, No. 23-660 (U.S. Jan. 16, 2024)	Order	U.S. Supreme Court	Certiorari denied

Practical Application in Tax Practice

Direct answer: In practice, Washington capital gains excise tax audits require individuals to document the location of tangible property at the time of sale, their domicile status for intangible property sales, and the applicability of deductions and exemptions. The DOR uses federal data matching to identify noncompliance and requires documentation to be maintained for at least four years from the date of sale.

Research

Direct answer: Researching Washington capital gains excise tax requires consulting RCW Chapter 82.87, WAC 458-20-300, WAC 458-20-301, and DOR Special Notices. The controlling judicial authority is Quinn v. State, 200 Wn.2d 1 (2023). DOR binding rulings may be requested for specific taxpayer circumstances.

Start with RCW 82.87.040 and RCW 82.87.100. Then consult WAC 458-20-300 for administration and WAC 458-20-301 for definitions and allocation rules. The DOR Special Notice on tiered rates provides guidance on the 7% and 9.9% structure. Quinn v. State, 200 Wn.2d 1 (2023), establishes the constitutional foundation. The DOR issues binding rulings upon request and nonbinding answers to general questions, with responses expected within 30 days.

Audit

Direct answer: A Washington capital gains excise tax audit typically arises from DOR data matching with federal returns or from the taxpayer’s return filing. The DOR will request documentation supporting the selling price, the location of tangible property, the taxpayer’s domicile status, and any deductions or exemptions claimed. Documentation must be maintained for at least four years from the date of sale.

The DOR conducts routine excise tax audits through its Audit Division and desk audits through its Compliance Division. If selected for audit, the taxpayer receives a formal letter, phone call, or both, with the contact information for the auditor. The taxpayer must provide documentation to support the selling price and any exemption claimed, maintained for a minimum of four years from the date of sale. For intangible property sales, the DOR will examine the taxpayer’s domicile status at the time of sale. For tangible property sales, the DOR will examine the location of the property. For pass-through entity gains, the DOR will examine the entity’s allocation of gains and the taxpayer’s ownership interest.

Appeals

Direct answer: A taxpayer may challenge a DOR assessment by filing a request for review with the DOR under WAC 458-20-100. If the dispute remains unresolved after the DOR’s final decision, an appeal to the Board of Tax Appeals generally must be filed within 30 days. The Board conducts a hearing and issues a decision.

The DOR administrative review process is governed by WAC 458-20-100 (Rule 100), which allows taxpayers to challenge assessments, refund denials, and certain other Department actions. If the dispute remains unresolved after the DOR’s final decision, an appeal to the Board of Tax Appeals generally must be filed within 30 days. The Board conducts a formal hearing and issues a written decision. The Board’s decision is subject to judicial review.

Litigation

Direct answer: Board of Tax Appeals decisions may be appealed to the Washington Superior Court. The Washington Supreme Court has original jurisdiction over constitutional challenges to state tax statutes. The Court of Appeals reviews Superior Court decisions on tax matters. The controlling case is Quinn v. State, 200 Wn.2d 1 (2023).

Judicial review of Board of Tax Appeals decisions is available in Washington Superior Court. The Washington Supreme Court has original jurisdiction over constitutional challenges to state tax statutes, as demonstrated in Quinn v. State, 200 Wn.2d 1 (2023). The Court of Appeals reviews Superior Court decisions on tax matters. The U.S. Supreme Court may grant certiorari for federal constitutional issues, though it denied certiorari in Quinn on January 16, 2024.

Planning Strategies

Direct answer: UHNWIs with Washington capital gains exposure should consider six primary planning strategies: (1) maximizing the standard deduction and charitable deduction; (2) utilizing the qualified family-owned small business deduction; (3) timing sales to manage the $1 million threshold for the 9.9% tier; (4) documenting domicile change before sales of intangible property; (5) structuring sales to allocate gains to jurisdictions with lower taxes; and (6) claiming the credit for taxes paid to other jurisdictions.

Key planning strategies include: (1) Maximize the standard deduction of $278,000** for 2025 under **RCW 82.87.060**, which is inflation-adjusted annually. (2) **Utilize the charitable donation deduction** under **RCW 82.87.080**, which allows a deduction for donations exceeding the **$250,000 statutory minimum. (3) Utilize the qualified family-owned small business deduction under RCW 82.87.070 if the taxpayer or family member materially participated in the business for at least five years immediately preceding the sale. (4) Time sales to manage the $1 million threshold** for the 9.9% tier, as gains exceeding **$1 million are taxed at 9.9% under SB 5813. (5) Document domicile change before sales of intangible property, as intangible gains are allocated to Washington if the taxpayer was domiciled in Washington at the time of sale under RCW 82.87.100(1)(b). (6) Claim the credit under RCW 82.87.100(2) for taxes paid to other jurisdictions on the same gains, preventing double taxation.

Interaction with Other Authorities

Direct answer: RCW Chapter 82.87 controls over inconsistent DOR guidance and form instructions. Federal tax law is relevant to the extent Washington conforms to specific IRC provisions, particularly the definition of capital asset under IRC § 1221 and the treatment of long-term capital gains under IRC § 1231. The U.S. Constitution limits Washington’s capital gains excise tax under the Due Process and Commerce Clauses.

Higher Authority

Direct answer: The U.S. Constitution is the highest authority, followed by the Washington Constitution and RCW Chapter 82.87. The Due Process Clause requires a minimum connection between Washington and the taxpayer. The Commerce Clause prohibits state taxes that discriminate against or unduly burden interstate commerce. The Washington Supreme Court upheld the tax under the Washington Constitution in Quinn v. State.

Under the Due Process Clause, Washington may tax capital gains only if the taxpayer has sufficient minimum contacts with the state. For tangible property, the location of the property at the time of sale establishes the connection. For intangible property, domicile establishes the connection. The Commerce Clause prohibits state taxes that discriminate against interstate commerce. The Washington Supreme Court in Quinn v. State held that the tax applies evenhandedly to in-state and out-of-state transactions and does not violate the Commerce Clause. The U.S. Supreme Court denied certiorari, declining to review the Commerce Clause issue.

Lower Authority

Direct answer: DOR Special Notices, publications, and form instructions are lower authority than RCW Chapter 82.87. WAC 458-20-300 and WAC 458-20-301 are primary regulatory authority binding on the DOR but subject to judicial review. DOR binding rulings are persuasive but not binding on courts.

DOR Special Notices and publications provide agency interpretation but lack the force of law. WAC 458-20-300 and WAC 458-20-301 are regulations adopted under the Washington Administrative Procedure Act, binding on the DOR but subject to challenge. DOR binding rulings issued upon request are persuasive but not binding on courts. WAC 458-20-301 provides examples of the DOR’s interpretation of complex transactions, including the treatment of holding company LLCs.

Conflict Resolution

Direct answer: When DOR guidance conflicts with RCW Chapter 82.87, the statute controls. When DOR regulations conflict with the statute, the statute controls. When a Washington court decision conflicts with a DOR regulation, the court decision controls. The Washington Supreme Court’s decision in Quinn v. State is binding on all parties.

The resolution rule is that legislative enactments supersede administrative rules and guidance. RCW 82.87.040 controls over any inconsistent DOR Special Notice or publication. WAC 458-20-300 and WAC 458-20-301 control over inconsistent DOR guidance, but are subject to the statute. Quinn v. State, 200 Wn.2d 1 (2023), is binding on all parties and establishes the controlling interpretation of the tax’s constitutionality. The Board of Tax Appeals must follow Washington Supreme Court precedent.

Sunset and Transition Rules

Direct answer: The Washington capital gains excise tax under RCW 82.87.040 has no scheduled sunset. The 9.9% tier under SB 5813 is effective retroactively to January 1, 2025. The standard deduction is adjusted annually for inflation. A proposed “Millionaires’ Tax” on income exceeding $1 million would take effect January 1, 2028, if enacted.

The capital gains excise tax has no scheduled sunset. The 9.9% tier under SB 5813 applies retroactively to January 1, 2025, and is reported on the 2025 capital gains tax return due April 15, 2026. The standard deduction is adjusted annually for inflation, with $278,000** for 2025. The proposed **”Millionaires’ Tax”** on Washington income exceeding **$1 million would take effect January 1, 2028, if enacted, and would apply alongside the existing capital gains excise tax. H.B. 1376, effective June 11, 2026, made certain technical changes to the capital gains tax, including provisions for prepayment six months prior to the due date.

Common Errors and Pitfalls

Assuming the standard deduction is $250,000.** The standard deduction was **$250,000 when the tax was enacted, but is now inflation-adjusted. The 2025 amount is **$278,000**. Taxpayers who use the original $250,000 figure underreport their deduction and overpay tax.
Failing to document domicile for intangible property sales. Under RCW 82.87.100(1)(b), intangible personal property gains are allocated to Washington if the taxpayer was domiciled in Washington at the time of sale. Taxpayers who claim non-Washington domicile must document their change of domicile.
Overlooking the real estate exemption. Under RCW 82.87.050, real estate sales are exempt from the capital gains excise tax, including gains passed through from entities to the extent directly attributable to real estate owned by the entity. Taxpayers who report real estate gains on their capital gains tax return overpay.
Misapplying the qualified family-owned small business deduction. The deduction under RCW 82.87.070 requires that the taxpayer or a family member materially participated in the business for at least five years immediately preceding the sale and held a qualifying interest for at least five years. Taxpayers who claim the deduction without meeting the participation requirement face assessment on audit.
Failing to claim the credit for taxes paid to other jurisdictions. Under RCW 82.87.100(2), a credit is allowed for legally imposed income or excise tax paid to another taxing jurisdiction on the same capital gains. Failing to claim this credit results in double taxation.
Ignoring the charitable donation deduction floor. The charitable donation deduction under RCW 82.87.080 only applies to donations exceeding the $250,000 statutory minimum. Taxpayers who claim donations below the threshold face assessment.
Failing to maintain documentation for four years. Under WAC 458-20-300, documentation supporting the selling price and any exemption claimed must be maintained for a minimum of four years from the date of sale. Taxpayers who discard records after three years face assessment on audit.
Assuming capital gains from pass-through entities are exempt. Gains passed through from S corporations, partnerships, LLCs, and grantor trusts flow through to individual owners and are subject to the tax to the extent allocated to Washington. Taxpayers who assume pass-through gains are exempt face assessment.

What This Article Does Not Cover

Washington personal income tax. Washington has no personal income tax and no income tax residency test. This article addresses only the capital gains excise tax, which functions as the state’s primary income-adjacent tax.
Business and occupation (B&O) tax. Washington’s B&O tax is a separate excise tax on business activities. A credit was previously available against the capital gains tax for B&O tax paid on the same sales, but this credit was repealed effective January 1, 2026. B&O tax is beyond the scope of this article.
Estate and inheritance tax. Washington imposes a separate estate tax. The capital gains excise tax is an income-adjacent tax on lifetime sales and exchanges, not a transfer tax at death.
Real estate excise tax (REET). Washington imposes a separate real estate excise tax on real property sales. The capital gains excise tax exempts real estate gains under RCW 82.87.050, but REET is a separate regime.
Federal capital gains tax. The federal tax on capital gains under IRC § 1(h) is separate from the Washington capital gains excise tax. This article addresses only the Washington tax.
Criminal tax evasion. This article addresses civil capital gains excise tax compliance and controversy, not criminal investigations.

How to Verify This Article

Primary sources for verification:

Washington State Department of Revenue: Special Notice on tiered rates, WAC 458-20-300, WAC 458-20-301, and DOR publications, available at dor.wa.gov.
Washington State Legislature: RCW 82.87.040, RCW 82.87.100, RCW 82.87.020, RCW 82.87.050, RCW 82.87.060, RCW 82.87.070, RCW 82.87.080, SB 5096 (2021), SB 5813 (2025), available at app.leg.wa.gov.
Washington Courts: Quinn v. State, 200 Wn.2d 1 (2023), available at courts.wa.gov.
Washington Board of Tax Appeals: Decisions available at bta.wa.gov.
Cornell Legal Information Institute: WAC 458-20-301 available at law.cornell.edu.

Query Fan-Out Answer Map

Fan-Out Question	Answered In	Answer Unit (verbatim)
What is the Washington capital gains excise tax?	H2: What Is the Washington Capital Gains Excise Tax?	The Washington capital gains excise tax is a 7% tax imposed under RCW 82.87.040 on the sale or exchange of long-term capital assets by individuals, with a 9.9% tier on taxable Washington capital gains exceeding $1 million.
What is the tax rate for Washington capital gains?	H2: What Is the Washington Capital Gains Excise Tax? > H3: Statutory Basis	RCW 82.87.040 imposes the capital gains excise tax at 7% of Washington capital gains, with the additional 2.9% tier for gains exceeding $1 million added by SB 5813 in 2025.
What is the standard deduction for Washington capital gains tax?	H2: What Is the Washington Capital Gains Excise Tax? > H3: Statutory Basis	RCW 82.87.060 provides deductions including the standard deduction, which was $278,000 for 2025 and is adjusted annually for inflation.
Who is subject to the Washington capital gains excise tax?	H2: What Is the Washington Capital Gains Excise Tax? > H3: Current Scope	The tax applies to individuals only, not business entities. However, gains passed through from pass-through entities such as S corporations, partnerships, LLCs, and grantor trusts flow through to individual owners.
How are tangible property gains allocated to Washington?	H2: Key Authorities and Cases > H3: Washington Statutory Authority	RCW 82.87.100(1)(a) allocates tangible personal property gains to Washington if the property was located in the state at the time of sale.
How are intangible property gains allocated to Washington?	H2: Key Authorities and Cases > H3: Washington Statutory Authority	RCW 82.87.100(1)(b) allocates intangible personal property gains to Washington if the taxpayer was domiciled in Washington at the time of the sale or exchange.
Is the Washington capital gains tax constitutional?	H2: Key Authorities and Cases > H3: Judicial Decisions	In Quinn v. State, 200 Wn.2d 1 (2023), the Washington Supreme Court held in a 7-2 decision that the capital gains excise tax is a valid excise tax on the sale or exchange of capital assets, not an income tax prohibited under the Washington Constitution.
What is the 9.9% tier for Washington capital gains?	H2: Interaction with Other Authorities > H3: Sunset and Transition Rules	The 9.9% tier under SB 5813 applies retroactively to January 1, 2025, and is reported on the 2025 capital gains tax return due April 15, 2026.
Are real estate gains exempt from the Washington capital gains tax?	H2: Common Errors and Pitfalls	Under RCW 82.87.050, real estate sales are exempt from the capital gains excise tax, including gains passed through from entities to the extent directly attributable to real estate owned by the entity.
How do you claim the qualified family-owned small business deduction?	H2: Common Errors and Pitfalls	The deduction under RCW 82.87.070 requires that the taxpayer or a family member materially participated in the business for at least five years immediately preceding the sale and held a qualifying interest for at least five years.
What is the charitable donation deduction for Washington capital gains?	H2: Key Authorities and Cases > H3: Washington Statutory Authority	Charitable donations exceeding $250,000 (the statutory minimum) are deductible under RCW 82.87.080.
How do I appeal a Washington capital gains tax assessment?	H2: Practical Application in Tax Practice > H3: Appeals	A taxpayer may challenge a DOR assessment by filing a request for review with the DOR under WAC 458-20-100. If the dispute remains unresolved, an appeal to the Board of Tax Appeals must generally be filed within 30 days.
What records do I need for a Washington capital gains tax audit?	H2: Practical Application in Tax Practice > H3: Audit	The taxpayer must provide documentation to support the selling price and any exemption claimed, maintained for a minimum of four years from the date of sale.
Is there a credit for taxes paid to other states?	H2: Key Authorities and Cases > H3: Washington Statutory Authority	RCW 82.87.100(2) provides a credit against the tax for legally imposed income or excise tax paid to another taxing jurisdiction on the same capital gains, with no carryback or carryforward of unused credits.
Did Washington capital gains tax rates change after 2025?	H2: Interaction with Other Authorities > H3: Sunset and Transition Rules	The 9.9% tier under SB 5813 applies retroactively to January 1, 2025. The proposed “Millionaires’ Tax” on income exceeding $1 million would take effect January 1, 2028, if enacted.

Frequently Asked Questions

What is the Washington capital gains excise tax?

Direct answer: The Washington capital gains excise tax is a 7% tax imposed under RCW 82.87.040 on the sale or exchange of long-term capital assets by individuals, with a 9.9% tier on taxable Washington capital gains exceeding $1 million. The tax applies to Washington capital gains exceeding the inflation-adjusted standard deduction, which is $278,000 for tax year 2025.

How are intangible property gains allocated to Washington?

Direct answer: Under RCW 82.87.100(1)(b), long-term capital gains or losses from intangible personal property are allocated to Washington if the taxpayer was domiciled in Washington at the time the sale or exchange occurred. Individuals domiciled outside Washington are not subject to the tax on their gain from intangibles.

Is the Washington capital gains tax constitutional?

Direct answer: Yes. In Quinn v. State, 200 Wn.2d 1 (2023), the Washington Supreme Court held in a 7-2 decision that the capital gains excise tax is a valid excise tax on the sale or exchange of capital assets, not an income tax prohibited under the Washington Constitution. The U.S. Supreme Court denied certiorari on January 16, 2024.

Are real estate gains exempt from the Washington capital gains tax?

Direct answer: Yes. Under RCW 82.87.050, real estate sales are exempt from the capital gains excise tax. This exemption applies whether the taxpayer recognizes the gain directly or through a pass-through entity, to the extent the gain is directly attributable to real estate owned by the entity. The DOR may require an appraisal or purchase price allocation to determine the portion of entity gain attributable to real estate.

What is the 9.9% tier for Washington capital gains?

Direct answer: Under SB 5813, enacted in May 2025, a 9.9% rate applies to Washington capital gains exceeding $1 million. The first $1 million in taxable Washington capital gains is subject to tax at 7%, and any amount exceeding $1 million is subject to the additional 2.9% tax, for a total of 9.9%. The tier is effective retroactively to January 1, 2025.

How do I appeal a Washington capital gains tax assessment?

Direct answer: A taxpayer may challenge a DOR assessment by filing a request for review with the DOR under WAC 458-20-100. If the dispute remains unresolved after the DOR’s final decision, an appeal to the Board of Tax Appeals generally must be filed within 30 days. The Board conducts a hearing and issues a decision that is subject to judicial review.

Conclusion

The Washington capital gains excise tax under RCW 82.87.040 represents a unique and significant tax exposure for ultra-high-net-worth individuals. Upheld as a constitutional excise tax in Quinn v. State, 200 Wn.2d 1 (2023), the tax applies at 7% on Washington capital gains exceeding the inflation-adjusted standard deduction, with a 9.9% tier on gains exceeding $1 million** effective retroactively to **January 1, 2025**. The allocation rules under **RCW 82.87.100** are the central audit battlegrounds: tangible property gains are allocated to Washington based on location, and intangible property gains are allocated to Washington based on **domicile** at the time of sale. Real estate gains are exempt, and credits are available for taxes paid to other jurisdictions. The DOR enforces the tax through federal data matching and requires documentation to be maintained for at least **four years** from the date of sale. UHNWIs with Washington capital gains exposure should proactively document their allocation positions, consider the timing of sales relative to the **$1 million threshold for the 9.9% tier, and maximize available deductions under RCW 82.87.060, RCW 82.87.070, and RCW 82.87.080.

Author Bio

Alan Goldstein is an Enrolled Agent and researcher with 26 years of experience in federal and state tax controversy. He advises high-net-worth families and closely held businesses on income-shifting strategies, charitable planning, and IRS audit defense.

Author sameAs: [LinkedIn URL], [Professional Profile URL], [Published Works URL]

Last Updated: October 5, 2026

Next Scheduled Review: October 2027

THIS ARTICLE IS FOR INFORMATIONAL PURPOSES ONLY AND DOES NOT CONSTITUTE LEGAL ADVICE. THE INFORMATION MAY BE OUTDATED AND YOU ARE NOT TO RELY ON IT. CONTACT YOUR PROFESSIONAL TO GUIDE YOU BASED ON YOUR CURRENT SITUATION, OR WHAT MAY APPLY TO PREVIOUS YEARS. THIS ARTICLE IS ONLY MEANT TO PROVIDE GENERAL INFORMATION AND NOT A SPECIFIC ANSWER. YOU ARE NOT OUR CLIENT AND WE HAVE NOT ADVISED YOU.

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