Washington Capital Gains Tax on Estate Assets: What Executors Need to Know

Washington's 7% capital gains excise tax sounds alarming when you are an executor about to liquidate a stock portfolio worth $2,000,000. In reality, for most estate liquidations that happen promptly after death, this tax rarely applies — because of how the federal step-up in basis interacts with Washington's capital gains calculation. But the exceptions matter, and trusts face different rules.

What Washington's Capital Gains Tax Is

In 2021, Washington enacted a 7% excise tax on the sale or exchange of long-term capital assets, including stocks, bonds, and business interests. The tax is collected by the Department of Revenue and was upheld by the Washington Supreme Court in 2023.

The tax applies to the gain recognized on qualifying asset sales. An inflation-adjusted standard deduction shields the first portion of annual gains: $270,000 for tax year 2024, $278,000 for 2025, with the amount adjusted annually by the DOR for subsequent years.

Above the standard deduction, gains are taxed at 7%.

The Step-Up Basis Rules Out Most Estate Liquidations

The most important word in "capital gains tax" is "gain." Without a gain, there is no tax.

Under federal law (IRC Section 1014), when someone dies, the cost basis of their capital assets is stepped up to the fair market value on the date of death. If the decedent bought stock for $200,000 and it is worth $1,500,000 at death, the cost basis for the heirs becomes $1,500,000.

If the executor promptly sells those shares for $1,500,000, the recognized capital gain is zero. No federal capital gains tax. And because Washington's capital gains tax applies to the same recognized gain — and that gain is zero — no Washington capital gains tax either.

In practical terms: for estates that liquidate appreciated stocks and investment accounts promptly after death, the Washington capital gains tax typically produces zero liability. The step-up in basis eliminates the built-in gain at the moment of death.

Washington is also a community property state, which amplifies this advantage. Under IRC Section 1014(b)(6), in a community property state, both the decedent's half and the surviving spouse's half of the community property receive a step-up at the date of death. A couple that bought a stock portfolio for $300,000 that is now worth $1,800,000 gets a step-up on the entire $1,800,000 — not just the decedent's half. The surviving spouse can sell the entire portfolio immediately with zero capital gains recognition.

What Washington's Capital Gains Tax Does NOT Apply To

Several additional exemptions in the Washington statute matter for estate administration:

Real estate: The Washington capital gains excise tax explicitly exempts the sale of real property. If an executor sells inherited real estate, the sale may trigger REET (the Real Estate Excise Tax), but it does not trigger the capital gains excise tax.

Retirement accounts: Assets held in qualified retirement accounts — 401(k)s, traditional IRAs, Roth IRAs, SEP-IRAs — are exempt. The sale of securities within these accounts is not subject to the capital gains tax. (Distributions from traditional IRAs and 401(k)s are subject to ordinary federal income tax as the funds are withdrawn, but that is a separate issue.)

Commercial fishing privileges: Exempt.

Certain depreciable business assets: Assets used in a trade or business that generate depreciation deductions are generally exempt.

When the Capital Gains Tax Can Apply to an Estate

Despite the favorable step-up rules, there are situations where Washington's 7% capital gains tax can reach estate assets:

Delayed estate liquidation: If an executor holds the estate open for years and the securities appreciate significantly beyond the date-of-death value before being sold, the excess appreciation is a real gain with no basis protection. Sell at $2,000,000 when the step-up basis was $1,500,000 and you have a $500,000 recognized gain — exceeding the standard deduction, producing a $222,000 taxable gain subject to 7%, or roughly $15,500 in Washington capital gains tax. This is rarely a concern for ordinary estate administration, but it surfaces for estates where distribution is delayed by disputes or complex administration.

Pass-through entities: If the estate holds an interest in a partnership, S corporation, or LLC treated as a pass-through entity, and that entity sells capital assets at a gain, the gain passes through to the estate or individual owners. The estate's share of pass-through gain may be subject to Washington's capital gains tax even if the step-up basis eliminated the gain on publicly traded securities.

Pre-death sales: If the decedent sold appreciated securities in the months before death (perhaps during a terminal illness to fund medical expenses), those gains are part of the decedent's final income tax return. Washington's capital gains tax on those sales belongs to the decedent's estate, due with the decedent's final capital gains filing for that tax year.

Capital Gains Tax on Trusts in Washington

This is where the rules become most complex for executors who are also serving as trustees.

Washington's capital gains excise tax statute imposes liability based on the taxpayer's Washington source income. For individuals, Washington sourcing rules look at residency. For trusts and estates, the sourcing analysis is more nuanced.

Grantor trusts (revocable living trusts) are treated as part of the grantor's estate during the grantor's lifetime. After death, they may become irrevocable. Capital gains realized during the administration period of an estate or trust pass through to the estate or trust tax return.

Non-grantor trusts are separate taxable entities for income tax purposes. A non-grantor trust that sells capital assets at a gain can itself be subject to Washington's capital gains tax on the recognized gain — to the extent the gain exceeds the standard deduction — based on the trust's Washington connections.

The interaction of pass-through income, trust fiduciary income tax returns (Form 1041), and Washington's capital gains excise tax is genuinely complex and benefits from CPA review for any trust with significant capital asset liquidations.

The Relationship to the New Washington Income Tax

In 2026, the Washington legislature passed ESSB 6346, enacting a 9.9% tax on "Washington taxable income" exceeding $1,000,000 per individual, effective January 1, 2028. Non-grantor trusts are explicitly included in this tax regime — trust income remaining in the trust above $1,000,000 triggers the 9.9% rate.

This creates a new planning imperative for trustees of ongoing irrevocable trusts: distributing income to multiple beneficiaries (each with their own $1,000,000 standard deduction) rather than accumulating it in the trust can avoid the 9.9% trust income tax beginning in 2028. Trustees with significant trust income should be working with a CPA now to model the distribution strategies that will be most tax-efficient after 2028.

The 7% capital gains excise tax and the upcoming 9.9% income tax affect different streams of trust income but are governed by the same underlying statute structure — and both require careful analysis when trust assets include appreciated securities or high-yield investments.

Practical Guidance for Executors

For most Washington estates, the sequence to minimize capital gains tax exposure is straightforward:

1. Establish the date-of-death fair market value for all capital assets (this is the step-up basis)
2. Request date-of-death account statements from every brokerage and financial institution
3. Liquidate securities and investment accounts promptly — the longer you wait, the more the estate accumulates real post-death gains
4. Preserve documentation of the date-of-death values for the estate tax return and for any subsequent Form 1041 filings
5. Consult a CPA before selling any pass-through business interest or maintaining a trust with ongoing investment income

The Washington Final Tax & Estate Tax Guide at /us/washington/estate-tax/ covers the full capital gains analysis, the step-up in basis calculation for community property estates, and the Form 1041 fiduciary income tax return requirements for estates generating income during administration.

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