RSUs and Washington State's New Taxes: What Seattle Tech Employees Need to Know

Key Takeaways

• Washington income tax hits RSU vesting above $1M starting 2028 (9.9%).
• Capital gains tax applies to post‑vest appreciation over $250K (7‑9.9%).
• RSU holders face double state tax exposure versus ISO holders.
• Private‑company RSUs worsen liquidity risk with extra state taxes.
• 2027 offers a tax‑free window before Washington income tax starts.

Pulse Analysis

Washington’s tax landscape has shifted dramatically for equity compensation. The state’s capital‑gains tax, introduced in 2025, levies 7% on long‑term gains between $250,000 and $1 million and 9.9% above that level. Two years later, a broad‑based income tax will apply a flat 9.9% to any income—including RSU vesting—exceeding a $1 million exemption. For Seattle tech employees whose RSU packages routinely push total compensation past these thresholds, the combined state burden can exceed $30,000 in a single year, a cost that was previously nonexistent.

The double‑tax exposure distinguishes RSUs from incentive stock options (ISOs). RSU vesting triggers ordinary‑income tax at both the federal and state levels, while any subsequent appreciation is taxed again as a capital gain. ISOs, by contrast, defer ordinary‑income recognition until exercise and can qualify for long‑term capital‑gain treatment, limiting exposure to Washington’s income tax. Private‑company RSUs exacerbate the problem because employees often cannot sell shares at vesting to cover taxes, meaning the new state levies increase out‑of‑pocket liability on paper wealth that remains illiquid.

Effective planning now hinges on timing and structure. Employees can aim to keep annual vesting below the $1 million threshold, negotiate smaller, more frequent grants, or accelerate income into 2027 when the state income tax is still dormant. Holding shares for at least a year can shift appreciation into the capital‑gain regime, but the $250,000 exemption must be considered. Charitable donations of appreciated shares and careful 409A compliance further mitigate exposure. Ultimately, many Seattle firms are re‑evaluating equity mix, favoring options that provide greater control over taxable events in a state that taxes both ordinary income and capital gains.