If you live in the Seattle metropolitan area—or anywhere in Washington State—the days of zero income and capital gains taxes are officially over.

Originally passed in 2021 as a flat 7% levy, the Washington Capital Gains Excise Tax has undergone massive legislative changes. Recently, the state introduced a new, aggressive tiered rate structure that retroactively impacts long-term capital gains, catching thousands of tech workers, investors, and startup founders completely off guard.

If you are planning to liquidate stock, sell a business interest, or cash out years of accumulated Restricted Stock Units (RSUs), calculating your state liability is no longer a simple math equation. Here is exactly how the new tiered rates work for the 2026 tax year, who is exempt, and how to project your liability before you hit the “sell” button.

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TL;DR: The 2026 WA Capital Gains Snapshot

Tax Concept	How It Impacts Your Wealth
The Base Rate (7%)	Applied to net long-term capital gains above the standard deduction but below $1 million.
The Top Tier (9.9%)	A 2.9% surtax is added, creating a 9.9% total tax on all long-term gains exceeding $1 million.
The 2026 Deduction	Approximately $278,000 (adjusted annually for inflation). You only pay tax on gains exceeding this amount.
Who Pays It	Individuals (not corporations). It heavily impacts tech employees selling RSUs/ESPPs and founders exiting their businesses.
Real Estate Exemption	Capital gains from the sale of real estate (your primary home or investment properties) are 100% exempt.

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1. The New Math: Understanding the 9.9% Tiered Rate

Washington’s capital gains tax only applies to long-term capital gains (assets held for longer than one year). Short-term gains are currently exempt from this specific excise tax.

Previously, anyone crossing the standard deduction simply paid a flat 7%. However, the legislature recently introduced an additional 2.9% surtax on high-dollar liquidations.

Here is how the progressive brackets work if you sell stock in 2026:

Scenario A (The Base Rate):

You are an Amazon employee in South Lake Union who decides to sell a large chunk of long-term RSUs to buy a house. Your net long-term capital gain is $500,000.

• You subtract the 2026 standard deduction (roughly $278,000).
• Your taxable Washington gain is $222,000.
• You owe 7% on that amount.
• Total WA State Tax Bill: $15,540 (in addition to your federal capital gains tax).

Scenario B (The 9.9% Cliff):

You are a Seattle startup founder who sells your company, resulting in a $5,000,000 long-term capital gain.

• You subtract the $278,000 standard deduction.
• Your taxable Washington gain is $4,722,000.
• You pay 7% on the gains up to $1 million ($70,000).
• You pay 9.9% on the remaining $3,722,000 ($368,478).
• Total WA State Tax Bill: $438,478.

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2. The Tech Worker Trap: RSUs and “Double Trigger” Vesting

For the 360,000-strong tech workforce in Washington, this tax requires meticulous financial planning.

If you work for a pre-IPO startup with “double trigger” RSUs, your shares do not fully vest until a liquidity event (like an IPO or an acquisition) occurs. When that event happens, five years of accumulated stock can vest and become liquid on the exact same day.

If you immediately sell those shares, you could easily blow past the $278,000 standard deduction and trigger the 7% tax—or worse, cross the $1 million threshold and trigger the 9.9% rate in a single tax year.

The Strategy: High-earning individuals must work closely with their brokerage and tax software to sequence their stock sales over multiple calendar years. By spreading the sales out, you can utilize the $278,000 standard deduction multiple times, drastically lowering your effective state tax rate.

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3. What is Completely Exempt?

The Washington Department of Revenue specifically excludes several major asset classes from this tax. You will not owe the 7% or 9.9% excise tax on the sale of:

• All Real Estate: This includes your primary residence, commercial buildings, and rental properties.
• Retirement Accounts: Assets sold within a 401(k), IRA, or Roth IRA.
• Qualified Small Businesses: The sale of substantially all of a qualified family-owned small business is exempt (though stringent gross revenue and operational requirements apply).
• Livestock and Timber: (For the Washingtonians operating outside the Seattle city limits).

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4. The Return Deadline and Filing Mechanics

Your Washington Capital Gains tax return is due at the same time as your federal tax return (typically April 15th).

Do not wait for a bill in the mail. You must proactively register an account with the Washington Department of Revenue’s SecureAccess Washington (SAW) portal to file your return and remit payment.

If you file a federal extension, you can receive an extension to file your Washington return. However, just like the IRS, an extension to file is not an extension to pay. If you expect to owe the tax, you must make an estimated payment by the April deadline to avoid late payment penalties and compounding interest.

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Frequently Asked Questions

Does the Washington Capital Gains Tax apply to cryptocurrency?

Yes. The sale of digital assets, including Bitcoin and other cryptocurrencies, is considered a sale of intangible personal property. If you held the crypto for more than one year and your total gains exceed the annual standard deduction, it is subject to the Washington capital gains tax.

Can I deduct charitable donations from my Washington capital gains?

Yes, but with strict limitations. You can deduct charitable donations made to qualified Washington-based nonprofits, but the deduction cannot exceed $111,000 for the year, and it only applies to donations made in excess of the standard deduction amount.

Is the Washington Capital Gains Tax deductible on my federal return?

Generally, yes. Because the Washington Supreme Court legally classified this as an “excise tax” rather than an income tax, it can typically be deducted on your federal Schedule A as a state and local tax (SALT), subject to the current federal SALT cap limitations.