I've spent the last decade advising founders, C-suite executives, and investors in Washington State on entity structure. In that time, I've learned one lesson that towers above all others: the decisions you make at incorporation echo through every future tax event. With Washington's new 9.9% income tax (ESSB 6346) set to take effect January 1, 2028, that lesson has become urgent.
The income tax is enacted and scheduled to begin in 2028. Build a plan under that law, while tracking the repeal initiative and litigation. Entity choice, income timing, and the facts of a move remain decisions you can prepare for now. See the Initiative 645 tracker.
This post is part of our Complete Guide to Washington's New Income Tax.
How Entity Structure Determines Your Tax Exposure
Washington’s income tax starts with federal adjusted gross income and applies Washington modifications, deductions, allocation rules, and credits. The $1 million standard deduction is shared by spouses and registered domestic partners. The tax generally reaches individuals; eligible pass-through entities have a separate elective tax mechanism. Distinguish those rules from existing business taxes and the capital-gains tax when comparing entity structures.
A C-corporation’s retained earnings generally do not become personal income to its shareholders merely because the corporation earns them. That can defer shareholder-level income, but does not make the business tax-free. Federal corporate income tax and Washington B&O tax can apply; Washington’s lack of a broad corporate net-income tax does not eliminate its gross-receipts tax. Dividends and a later stock sale require their own shareholder analysis. An S corporation or partnership generally passes taxable items through to owners even when it retains the cash.
The practical comparison is after-tax cash retained in the business and ultimately received by owners. Include federal entity and owner taxes, Washington business taxes, future dividends or sale proceeds, and any available exclusions and credits. Retaining earnings can defer a shareholder tax event; it is not a promise of tax-free compounding.
The recurring mistake is founders choosing an LLC or S-corp for simplicity or because their accountant defaulted to it, without thinking through the long-term tax consequences. That choice seemed neutral in year one. By year five or ten, it has cost them hundreds of thousands of dollars.
The Federal-State Planning Interplay
Most tax planning happens in isolation. Federal tax advisors focus on federal problems. State tax advisors focus on state problems. But they are not separate. They are deeply intertwined, and the best planning holds both in mind.
A C corporation generally pays federal income tax on earnings, with a second shareholder tax when earnings are distributed as taxable dividends. S-corporation income generally passes through to shareholders and is taxable to them whether or not distributed. That pass-through income is generally not self-employment income. A shareholder-employee must receive reasonable compensation for services; wages are subject to employment taxes, and the IRS may reclassify distributions that substitute for wages. See IRS guidance on S-corporation compensation.
The right structure for a Seattle founder in 2026 is not the same as it was in 2024. The federal-state calculus has shifted. This is why I'm increasingly advising founders to think about C-corp formation or conversion before 2028, locking in the structure before the new tax regime begins.
Why QSBS Creates a Monumental Advantage for C-Corp Founders
Section 1202 can exclude eligible gain on qualifying stock. The applicable per-taxpayer, per-issuer dollar limit is generally $10 million for stock acquired on or before July 4, 2025 and $15 million for stock acquired after that date, coordinated with prior exclusions and the alternative 10-times-basis limit. Eligible later-acquired stock can receive 50%, 75%, or 100% exclusion after three, four, or five years. Earlier stock has different holding-period and exclusion-percentage rules. Statutory inflation adjustments begin after 2026.
QSBS generally requires stock of a domestic C corporation for federal tax purposes. An LLC validly classified as a C corporation can potentially qualify; an S corporation or an LLC taxed as a partnership does not issue QSBS. Tax classification is only one requirement: original issuance, gross assets, active business, redemptions, and the remaining §1202 tests still matter.
Federally excluded §1202 gain does not enter either federal net long-term capital gain or federal AGI, the starting points for Washington’s capital-gains and income taxes. Under enacted law, the excluded gain therefore stays outside both bases. The separate question is whether the stock and gain actually qualify for the federal exclusion.
A business that starts as a partnership or S corporation is not necessarily barred from future QSBS planning. A later qualifying corporate transaction and original issuance may start a new stock holding period; the business’s earlier formation date does not supply that period. Simply terminating an S election does not turn previously issued S-corporation stock into QSBS. Evaluate the transaction, applicable asset limit, and treatment of pre-conversion appreciation before promising a benefit.
Getting the structure right early helps. Later restructuring may be possible, but can add tax, cost, and a new holding period.
Timing Strategies: Accelerating Income Before 2028
The years before the January 1, 2028 income-tax start date are a planning window. Each proposed transaction still needs its own tax and business analysis.
Moving a taxable ordinary-income event into 2026 or 2027 can avoid the new income tax on that event. For example, assume a full-year Washington resident has $2 million of wages in 2028, the full $1 million standard deduction, and no other income, deductions, or credits: the income tax would be $99,000. Federal tax and existing Washington taxes require separate analysis. For long-term gains, calculate the capital-gains tax and the income-tax base separately, then apply the §205 credit; timing is not automatically neutral.
For some business owners, this might justify accelerating a sale, or timing a Section 338 election, or structuring a earn-out to land proceeds in 2027 rather than 2028. The math can be stark.
I emphasize "for some." This is not advice to rush a sale or trigger gains unnecessarily. But if you're already planning a transition, the timeline matters. And for investors holding appreciated securities, harvesting gains before the tax takes effect is worth serious analysis. I've already had several clients do this.
Deferral Techniques: Roth Conversions, Installment Sales, and Others
On the opposite end of the spectrum are strategies to defer gains beyond 2028, or to shift them to lower-income years, or to spread them over time.
A Roth conversion generally includes the untaxed converted amount in federal income. A conversion before 2028 precedes Washington’s new income tax; one in 2028 or later requires a calculation using that year’s income, deductions, and credits. Qualified Roth IRA distributions are federally tax-free, but earnings withdrawn in a nonqualified distribution can be taxable. Compare the conversion’s current federal cost with projected future withdrawals. See IRS Roth IRA guidance.
Paying conversion tax from other funds can leave more assets in the retirement account, but it is not a legal requirement for a conversion. Account withdrawals used to pay the tax can have their own tax and early-distribution consequences. Model the source of the tax payment and your liquidity needs.
An eligible installment sale under §453 can spread gain recognition, but the method has exclusions and limitations, including for stock traded on an established securities market and depreciation recapture. Review interest, buyer credit risk, and the tax character of each payment. Recognition timing and Washington allocation are separate questions; deferral does not guarantee a lower state tax bill.
For concentrated positions, evaluate hedging and diversification separately from tax deferral. Collars and exchange funds have their own eligibility, constructive-sale, straddle, diversification, and liquidity issues. Neither guarantees tax deferral or a better after-tax outcome.
The Domicile Question: Staying vs. Leaving Washington
The enacted income-tax statute already defines domicile-based residency, a separate abode-and-day-count test, part-year residency, and income-allocation rules. Administrative guidance may clarify their application, but the statutory framework is available now. Apply ESSB 6346 §101(8) and §§401–406 to the actual move and income.
Some high-net-worth individuals are considering leaving Washington before the tax takes effect. I understand the instinct. But I also think it's often oversold and frequently impractical.
First, establishing non-domicile is not easy. Washington will challenge it if you've lived here for years and still have business interests, family, or property here. You have to demonstrate a genuine intent to establish a new domicile and actually reside there. Simply buying a small home in Nevada and claiming you live there while you spend six months in Seattle will not work.
A move does not eliminate every Washington tax obligation. Direct real-estate sales are exempt from the capital-gains tax under RCW 82.87.050; long-term gains exempt under that chapter are also excluded from the income-tax add-back under §302. Rental income, ordinary business income, real-estate excise tax, and other levies require separate analysis. Nonexempt tangible-property gains have their own allocation rules. For personally held stock and other intangibles, RCW 82.87.100(1)(b) looks to domicile at the sale. Income-tax residency and Washington-source income remain separate questions.
Third, the relocation itself often creates problems. You may trigger tax liabilities in other states. You may lose access to your business and professional networks. For founders and operators, Washington's proximity to Seattle's venture ecosystem, tech talent, and legal infrastructure is valuable. Moving to avoid a 9.9% tax is a large life decision that should not rest solely on tax savings.
That said, if you've already built a business or made your gains and you're in the harvest phase—taking money off the table and moving to a lower-tax lifestyle—then domicile planning becomes more relevant. It's a tool for the late stage, not the early stage.
Why Structure Decisions Echo Through Every Future Tax Event
I want to circle back to the main point. The structure you choose when you incorporate your company will shape every future tax outcome. This is not hyperbole.
Entity choice shapes the available planning, but does not guarantee the tax result. C-corporation tax status can support QSBS eligibility and shareholder-level deferral; the business and stock must still satisfy the relevant rules. A partnership or S corporation may offer other advantages, and a later restructuring can be possible. Compare the business’s actual cash needs, expected exit, tax costs, and holding periods.
Similarly, the choice of where to incorporate—in Washington, Delaware, Nevada—affects your tax exposure, your regulatory burden, and your legal protections. In Washington particularly, the interaction between Washington's B&O tax (a gross-revenue tax) and the new income tax creates planning opportunities for certain business structures. A service business might operate very differently than a product company.
The point is simple: structure is not a technicality. It's the foundation of everything that follows. Getting it right at the beginning—when the decision is still reversible—is far easier than trying to fix it later.
Moving Forward
We are in a window. The new tax has not taken effect. The regulations are not final. And we still have time to plan. But that window is closing. Every month that passes is a month you cannot get back for timing strategies like income acceleration or Roth conversions.
If you're a founder, an investor, or a high-earning professional in Washington State, now is the time to get intentional about structure and timing. The questions are not technical—they're strategic. They require looking at your business, your income, your assets, and your timeline, and deciding what the tax outcome should be.
I work with clients on precisely these decisions. If this post resonates with you, or if you're uncertain about your own structure and plan, I'd encourage you to dig deeper.
Related Posts
- C-Corp vs. S-Corp vs. LLC: Washington Income Tax Comparison
- Washington's New Income Tax: What Founders, Investors, and High-Earners Need to Know
- Does QSBS Avoid Washington's New 9.9% Income Tax?
- Roth Conversions Before 2028: A Washington Income Tax Strategy
- How to Change Washington Domicile and Avoid the Income Tax
- Washington's New Income Tax: The Complete Guide
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This post is for educational purposes only and is not legal or tax advice. Consult a qualified attorney about your specific situation.
