Washington vs. California: A Tax Comparison for Founders and Investors

By Joe Wallin | April 2026 | ~10 min read

For years, the pitch was simple: move to Washington, pay no income tax. California's 13.3% top rate made it the most expensive state in the country for founders, investors, and high earners. Washington was the obvious alternative — same time zone, strong tech ecosystem, zero income tax.

That calculus changed on March 30, 2026, when Governor Ferguson signed ESSB 6346 into law. Starting January 1, 2028, Washington imposes a 9.9% income tax on household income above $1 million. Washington is no longer a zero-tax state for high earners. For the full planning roadmap under the new Washington state income tax, see our action guide for high earners.

But it's not California, either. The two systems differ in fundamental ways — on rates, on QSBS, on capital gains, on pass-through treatment, and on who actually ends up paying more. Here's a detailed comparison.

(For an overview of ESSB 6346, see Washington's New Income Tax: What Founders, Investors, Athletes, and High Earners Need to Know. For the full tax landscape, see Washington State Taxes.)

TL;DR: Washington is no longer tax-free for high earners, but it's still substantially cheaper than California for most founders and investors above $1M. The biggest difference: QSBS gains are fully excluded in Washington and fully taxed in California — a gap worth millions on a single exit. Real estate gains are also largely exempt in Washington. The main area where California wins: no state estate tax.

Comparison at a Glance

The Headline Rates

California: Progressive brackets from 1% to 12.3%, plus an additional 1% Mental Health Services Tax on income above $1 million. Effective top rate: 13.3%. Applies to all taxable income — wages, capital gains, business income, investment income. No preferential rate for any income type.

Washington (starting 2028): A flat 9.9% on Washington taxable income above $1 million (after modifications). Below $1 million: 0%. The $1 million standard deduction means that a Washington resident earning $999,999 owes nothing.

The gap: At the top, California is 3.4 percentage points higher. But the real difference is structural: California taxes your first dollar of income. Washington doesn't tax anything until you cross $1 million. For someone earning $1.5 million, the effective Washington rate is about 3.3% on total income — compared to roughly 11%+ in California.

QSBS: The Biggest Single Difference

This is where the comparison gets dramatic.

California does not conform to Section 1202. If you sell qualified small business stock and exclude the gain at the federal level, California ignores the exclusion entirely and taxes the full gain at up to 13.3%. A founder who sells $10 million in QSBS pays $0 federal tax and approximately $1.33 million to California.

Washington currently protects QSBS. Under ESSB 6346, Washington base income starts with federal AGI (§101(3)). Because QSBS gain excluded under Section 1202 never enters federal AGI in the first place, it never enters the Washington tax base. A founder who sells $10 million in QSBS pays $0 federal tax and $0 to Washington.

This single difference can be worth millions of dollars on a single transaction. For a founder with $15 million in QSBS gains, the California bill is approximately $2 million. The Washington bill is zero.

There is a caveat: the Washington legislature considered QSBS add-back bills (SB 6229 and HB 2292) during the 2026 session, and they could return in future sessions. For now, QSBS is fully protected. For a deeper analysis, see Does QSBS Avoid Washington's New 9.9% Income Tax? and our 2026 QSBS State-by-State Conformity Guide.

Capital Gains Treatment

California: Taxes capital gains as ordinary income. No preferential rate, no exemption, no distinction between short-term and long-term. The top rate on capital gains is 13.3%.

Washington: Two separate taxes apply to capital gains:

First, the Washington capital gains tax (already in effect under chapter 82.87 RCW) taxes long-term capital gains above the standard deduction — $250,000 when enacted in 2022, now indexed annually ($278,000 for tax year 2025) — at 7%, with gains above $1 million taxed at 9.9%. But gains from the sale of real property held directly are exempt, and QSBS gains are excluded.

Second, the new income tax (ESSB 6346) starts with federal AGI. Under §302, long-term capital gains are stripped out and then added back into Washington base income for any taxpayer who owes the capital gains tax — so those gains do reach the 9.9% income tax. The overlap is relieved at the credit stage: §205 allows a nonrefundable credit for the capital gains tax paid, capped at the income tax otherwise due. The practical result is that a resident pays the greater of the two regimes on a long-term gain, not their sum.

Net result for a $5 million long-term capital gain (non-QSBS, non-real estate):

• California: approximately $665,000 at the 13.3% marginal rate (the blended effective rate is modestly lower, since California's top rate applies only above ~$1 million of income)
• Washington: approximately $438,478 under the capital gains tax — 7% on the $4,722,000 of gain above the $278,000 deduction ($330,540), plus the 2.9% surtax on the $3,722,000 above $1,000,000 ($107,938). These gains also enter the ESSB 6346 income tax base, but the §205 credit for capital gains tax paid offsets it, so they are not taxed twice. (This example assumes the $5 million gain is the taxpayer's only Washington income; with other ESSB 6346 income in the same year, the shared $1 million deduction and the §205 credit cap can change the result.)

Washington is cheaper on capital gains — but the gap is narrower than the headline rate difference suggests, because Washington's capital gains tax applies at lower thresholds than the income tax.

Real Estate

California: Taxes gains on real property sales at full ordinary income rates (up to 13.3%).

Washington: Gains from the direct sale of real property are exempt from the capital gains tax under RCW 82.87.050. Under §302, exempt real-estate gains are stripped from federal AGI and never added back to Washington base income, and they generate no capital gains tax. Net result: direct real estate gains are largely excluded from both Washington taxes.

This is a massive advantage for real estate investors in Washington. See Are Real Estate Gains Subject to Washington's New 9.9% Income Tax? for the full analysis, including the entity look-through rules.

W-2 Income and Compensation

For high-earning employees — senior tech executives, partners at professional firms, athletes — the comparison is more straightforward:

At $1.5 million total compensation:

• California: approximately $165,000+ in state income tax
• Washington: 9.9% × $500,000 (amount above $1M) = $49,500

At $3 million total compensation:

• California: approximately $365,000+ in state income tax
• Washington: 9.9% × $2,000,000 = $198,000

At $5 million total compensation:

• California: approximately $630,000+ in state income tax
• Washington: 9.9% × $4,000,000 = $396,000

Washington is cheaper at every income level above $1 million — but the savings narrow as income increases, because California's progressive rate structure means the blended effective rate is lower than 13.3% on total income, while Washington's flat 9.9% applies to every dollar above $1 million.

409A valuation and RSUs

California: Taxes ISO spread at exercise (if AMT applies), NQSO spread at exercise, and RSU value at vesting — all at ordinary income rates up to 13.3%.

Washington: Same income items flow through federal AGI into Washington base income. No AMT add-back in the statute (confirmed by reviewing §§301–308). The key difference: the $1 million standard deduction means that equity compensation events below $1 million in total household income are tax-free in Washington.

For a detailed breakdown of how Washington's tax applies to equity comp, see How Washington's New 9.9% Income Tax Applies to Stock Options and RSUs.

Pass-Through Business Income

California: Taxes pass-through income (K-1) at full individual rates. California does offer a pass-through entity elective tax (AB 150) at 9.3%, with a credit on the individual return. This partially addresses the federal SALT cap.

Washington: Taxes pass-through income at 9.9% above the $1 million threshold. Section 502 provides an entity-level tax election at 9.9%, creating a full federal SALT deduction (compared to California's 9.3% entity-level rate). Washington also provides a §204 credit for B&O taxes paid on the same income.

For pass-through owners above $1 million, Washington's entity-level election is slightly more valuable at the federal level (9.9% deductible vs. 9.3% deductible in California), but the overall state tax burden is lower because the first $1 million is exempt. See Washington's New Income Tax and Pass-Through Business Income for the full analysis.

The Marriage Penalty

California: Uses separate brackets for married filing jointly that are double the single-filer brackets. This eliminates much (but not all) of the marriage penalty at higher income levels.

Washington: Imposes a combined $1 million standard deduction for married couples — regardless of filing status. Two unmarried individuals each get $1 million; a married couple shares one. Maximum penalty: $99,000/year. See The Marriage Penalty Explained.

This is one area where California is actually more generous than Washington. California's doubled brackets mean that two-income couples don't face the same cliff that Washington creates.

Estate and Gift Taxes

Neither Washington nor California imposes a gift tax.

But there's a significant difference on the estate tax side:

California: No state estate tax. Estates of California residents are subject only to the federal estate tax (with its $15 million exemption in 2026).

Washington: Imposes its own estate tax on estates above ~$3 million (currently $3,076,000 for 2026, dropping to $3 million flat on July 1, 2026 under SB 6347), with rates currently graduated from 10% to 35% for decedents dying through June 30, 2026, rolling back to 10%–20% on July 1, 2026. The exemption is far lower than the federal threshold, which means many estates that owe nothing to the IRS still owe Washington. For a $10 million estate, the Washington estate tax is approximately $1 million (after the July 2026 rollback; higher for a death before then) — a cost that doesn't exist in California.

This is one of the most overlooked factors in the WA vs. CA comparison. A founder who moves to Washington to save on income taxes may end up paying more in estate taxes than they saved — especially if they die before a planned exit or before implementing an estate plan that moves assets out of the Washington estate. Washington's estate tax has no portability between spouses (unlike the federal exemption), which compounds the problem for married couples.

For founders with significant wealth, the estate tax picture needs to be modeled alongside the income tax savings. The income tax advantage of Washington over California can be substantial on an annual basis, but the estate tax disadvantage is a one-time hit that can dwarf years of income tax savings if the estate is large enough.

Other Taxes That Stack

The income tax isn't the only tax in play. Here's the full picture:

Washington's additional taxes:

• Capital gains tax: 7%–9.9% on long-term gains above ~$278K (2025, indexed; already law)
• B&O tax: 0.471%–2.1% on gross receipts (depending on classification)
• JumpStart payroll tax (Seattle): 0.7%–2.4% on payroll above $7M
• WA Cares: 0.58% payroll tax on all wages
• No estate tax exemption portability (WA estate tax starts at ~$3M)

California's additional taxes:

• No separate capital gains tax (taxed as ordinary income)
• No gross receipts tax comparable to B&O
• CA SDI: 1.3% on wages (employee-paid)
• No local income taxes
• Higher property tax assessment base in some cases

The stacking effect is significant. A Washington founder selling a company for $20 million in non-QSBS gains faces capital gains tax plus (potentially) income tax on other income in the same year — but the total is still substantially less than California's 13.3% on the full gain.

The California Trap That Survives Your Move: Equity Compensation Sourcing

Changing your domicile to Washington protects the capital gain on a stock sale. It does not protect the compensation embedded in equity you earned while working in California. Those are two different tax questions, and a move only answers one of them.

California taxes nonresidents on income from services performed in California. For equity compensation, the question isn't where you live when you exercise, vest, or sell — it's where you were working while you earned it. Under the Franchise Tax Board's allocation method (FTB Publication 1004), California sources option and RSU income by workdays:

• Nonqualified stock options: the spread at exercise is allocated over the grant-to-exercise period. The portion of that period you worked in California is California-source compensation, taxable at up to 13.3% — even if you exercise years after moving to Seattle.
• RSUs: the value at vesting is allocated from grant to vest, on the same workday ratio.

Concretely: you're granted NQSOs while running the company from San Francisco, move to Washington in year three with a clean domicile change, and exercise in year five with a $4 million spread. The grant-to-exercise period spans your California years. If 40% of those workdays were in California, roughly $1.6 million of that spread is California-source income, and California will tax it. The move protected the post-move appreciation and the eventual capital gain on the shares. It did not protect the compensation you accrued before you left.

This is why the timing of a move against your grant, vesting, and exercise calendar matters as much as the move itself. The equity that comes out cleanest is what's granted after you leave, plus the pure capital-gain portion of what you already hold. The compensation element in between gets allocated, and California pursues it.

So model the equity-sourcing piece on its own. A Washington move is decisive for your future income, your QSBS, and the gain on a sale — but it is not retroactive forgiveness for compensation you earned on California soil.

The Relocation Decision

For founders and investors weighing a move, the comparison comes down to a few key questions:

Do you hold QSBS? If yes, Washington saves you millions compared to California — potentially the single largest tax benefit available. This alone can justify a move.

Is your income primarily W-2 above $1 million? Washington is cheaper, but the gap narrows at very high income levels. At $5 million in W-2 income, you save roughly $235,000 per year in Washington vs. California. That's significant but may not justify a lifestyle change if you prefer living in California.

Do you have significant real estate gains? Washington's exemption for direct real property sales is a major advantage. California taxes these gains at full rates.

Are you considering other no-tax states? Texas, Florida, Nevada, and Wyoming still have no income tax at all. If the goal is pure tax minimization, those states remain cheaper than Washington for high earners. Washington's advantage is the combination of lower taxes and proximity to the Pacific Northwest tech ecosystem.

Can you actually leave California? California's Franchise Tax Board is notoriously aggressive about auditing departing residents. A move must be genuine — change of domicile, sale of the California home, establishment of real ties in the new state. California will look at where your kids go to school, where your doctors are, where you vote, and where you spend your time. A paper move doesn't work. (Washington has its own residency rules — see The 30-Day Rule for those details.)

One trap to flag before you bank on a move: relocating protects your ongoing income, but it does not automatically protect the sale itself. A stock sale is allocated by your domicile on the closing date — not by a day-count safe harbor — so clearing California’s safe harbor or Washington’s 30-day rule means nothing if your domicile hasn’t genuinely changed before the deal closes. (See why your stock sale doesn’t care about the safe harbor and the two states’ safe harbors compared.)

Caveats and Forward-Looking Risks

Before making any relocation decision based on this comparison, consider three risks that could narrow or eliminate Washington's advantage:

QSBS protection is not guaranteed. The Washington legislature considered QSBS add-back bills (SB 6229 and HB 2292) during the 2026 session. They did not pass, but they will almost certainly return. If the legislature adds QSBS gains to Washington base income, the single largest advantage over California disappears overnight. Founders planning a QSBS exit in 2028 or later should model the scenario where Washington taxes QSBS at 9.9%.

Rate creep is historically likely. Washington's income tax launches at 9.9% on income above $1 million. Every state that has introduced an income tax has subsequently raised the rate, lowered the threshold, or both. If Washington follows the pattern — and historical precedent strongly suggests it will — the gap with California will narrow over time. Oregon, for one example, started at 5% in 1930 and is now 9.9% on income above $125,000 (single) / $250,000 (joint).

The estate tax can offset years of income tax savings. Washington's estate tax starts at ~$3 million with rates up to 20% and no spousal portability. A founder who moves to Washington and saves $200,000 per year in income taxes but dies with a $15 million estate could face a Washington estate tax bill exceeding $1.5 million — effectively erasing seven or eight years of income tax savings. California has no estate tax. Any serious WA-vs-CA analysis must model both income taxes and estate taxes over the expected time horizon.

One uncertainty cuts the other way. ESSB 6346 is in active constitutional litigation — a challenge led by the Citizen Action Defense Fund, with former Attorney General Rob McKenna and former Supreme Court Justice Phil Talmadge on the briefs, is pending in Klickitat County. In May 2026 the Washington Supreme Court rejected the referendum path but did not decide whether the tax is constitutional. No injunction has issued and the 2028 date stands, so plan as if it survives. But note the direction: if the income tax is struck down, Washington's advantage over California widens rather than narrows — the capital gains and estate taxes would remain, but the 9.9% income tax would not. Why the challenge has real teeth.

The Bottom Line

Washington is no longer a tax haven. But for most founders and investors above the $1 million threshold, it remains substantially cheaper than California — especially for QSBS holders, real estate investors, and pass-through business owners. The gap is biggest on exit transactions and smallest on pure W-2 income.

The decision isn't just about taxes, of course. California has a deeper venture capital ecosystem, better weather (for most people), and a larger talent pool in many sectors. Washington has no income tax below $1 million, protected QSBS, exempt real estate gains, and a strong tech corridor.

For now, the math still favors Washington for high earners. But the direction of travel is clear: Washington is adding taxes, not removing them. Plan accordingly.

Frequently asked questions

What is California's capital gains tax rate in 2026?

California has no separate capital gains rate. It taxes capital gains — short-term and long-term — as ordinary income, at brackets running from 1% up to 13.3%. The 13.3% top rate includes the 1% Mental Health Services Tax on income above $1 million. A top-bracket Californian pays up to 13.3% in state tax on a gain, on top of federal capital gains tax.

Does Washington tax capital gains?

Yes. Washington's capital gains excise tax applies to long-term gains above the standard deduction ($278,000 for 2025, indexed) at 7%, with a 9.9% rate on Washington capital gains above $1 million. Gains from directly held real estate and from qualified small business stock are excluded. Beginning in 2028 those gains also enter the ESSB 6346 income tax base, but a credit prevents the same gain from being taxed twice.

Is Washington cheaper than California for taxes?

For most founders and investors above $1 million, yes. Washington has no income tax below $1 million, fully excludes QSBS, and exempts directly held real estate gains, while California taxes all of it as ordinary income up to 13.3%. The main place California wins is estate tax: California has none, while Washington taxes estates above $3 million.

Does moving to Washington avoid California tax on my equity?

Only partly. A genuine domicile change protects your future income and the capital gain on a later sale. It does not erase California's claim on equity compensation you earned while working in California — the state sources option and RSU income by where you worked over the vesting and exercise period, so a portion can stay California-taxable even after you move.

Does Washington tax QSBS?

Not currently. Because gain excluded under federal Section 1202 never enters federal AGI, it never enters Washington's tax base. Add-back bills (SB 6229 and HB 2292) were considered in the 2026 session and did not pass, but could return in a future session.

Related Reading

• Will Washington's Income Tax Rate Go Up? (History Says Yes)
• State Tax Comparison for Startup Founders
• Washington's Capital Gains Tax and QSBS: A Founder's Guide
• How to Convert Your Delaware C-Corp to a Public Benefit Corporation
• How to Change Your Washington Domicile to Avoid the Income Tax
• Roth Conversions Before 2028: The Window Is Closing
• The Washington Founder Exit Map

Considering a move between California and Washington? Book a 20-minute intro call to discuss how the comparison applies to your specific situation. Also see: Washington State Taxes Guide | Income Tax Planning Guide for High Earners

This post is for educational purposes only and is not legal or tax advice. Consult a qualified attorney about your specific situation.