By Joe Wallin | April 9, 2026 | ~9 min read
In This Guide
- → Understanding ISOs and NSOs: The Foundation
- → Washington's 2028 Income Tax: The New Reality
- → The ISO Advantage—And Its Limits
- → The AMT Trap: Don't Overlook Federal Planning
- → Early Exercise and Section 83(b) Elections: The Accelerated Path
- → Liquidity Constraints and The Real-World Problem
- → The QSBS and Section 1202 Connection
- → NSO Exercise Timing: The Straightforward Calculation
- → The 2027 Planning Window
- → The Interaction with QSBS and Entity-Level Planning
- → Your Pre-Year-End Checklist
- → A Final Word on Interaction with Other Tax Planning
- → The Bottom Line
Washington’s income tax begins January 1, 2028. For an NSO holder whose taxable exercise income would otherwise fall above the applicable deduction, recognizing that income before 2028 can reduce Washington income tax. An ISO exercise-and-hold generally creates no ordinary income in federal AGI even after 2027, so there is no universal December 2027 exercise deadline. Compare award type, taxable-event timing, residency, liquidity and total taxes before exercising.
A related timing question: whether a nonrecourse note can start your QSBS holding period.
This post will walk you through the mechanics of stock option exercise, explain how Washington's new tax regime impacts your planning, and give you a practical framework for deciding what to do before the clock strikes midnight on December 31, 2027.
This post is part of our Complete Guide to Washington's New Income Tax.
Understanding ISOs and NSOs: The Foundation
To plan effectively around Washington's income tax, you need to understand the two types of stock options and how they're taxed at exercise. They have fundamentally different tax consequences, and the distinction only gets more important under the new tax regime.
A qualifying ISO exercise-and-hold generally creates no regular federal income, but the exercise spread can produce an AMT adjustment. A $10 spread on 10,000 shares is a $100,000 adjustment, not a $100,000 tax bill. Actual AMT depends on the entire return. A sale in the same calendar year generally removes the separate exercise adjustment and is a disqualifying disposition; a later-year sale does not erase the exercise-year adjustment. See Form 6251 instructions, line 2i.
For a typical NSO exercised into vested shares, ordinary compensation equals exercise-date FMV minus the exercise price. A $10 spread on 10,000 shares creates $100,000 of compensation. Employment or self-employment taxes depend on the service relationship. Beginning in 2028, Washington’s income tax can also apply after the relevant deductions and adjustments. Early exercise into unvested shares requires a separate §83 analysis.
This distinction is about to matter more than it ever has for Washington residents.
Washington's 2028 Income Tax: The New Reality
In 2021, Washington's legislature enacted a capital gains excise tax (ESSB 5096), which the Washington Supreme Court upheld in 2023. That tax was narrowly structured. In 2026, the legislature went further and passed ESSB 6346—a 9.9% income tax on income above $1 million, effective January 1, 2028. This is a genuine tax on income, not just capital gains.
Taxable NSO compensation recognized in 2027 is outside Washington’s new income tax. Recognizing it in 2028 can create state tax, but only after applying the Washington base rules, deductions and credits. Spouses and registered domestic partners share the $1 million standard deduction; residency and sourcing also matter.
Assume a full-year Washington resident exercises 10,000 NSOs into vested shares at an $11 FMV and a $1 strike: $100,000 compensation. Hold the spread and all other facts constant, assume other Washington income already exhausts the $1 million deduction, and assume no relevant credits or other deductions. A December 2027 exercise creates no Washington income tax; a January 2028 exercise adds $9,900. If all the spread is taxed federally at 37%, incremental federal income tax is $37,000, before employment taxes. That is a marginal-rate illustration, not a forecast of the entire return or unchanged future share value.
For someone exercising options in the six or seven figure range, 2027 versus 2028 exercise could mean a difference of $50,000, $100,000, or more in after-tax cash.
The ISO Advantage—And Its Limits
A qualifying ISO exercise-and-hold generally does not put its spread in federal AGI, so the spread alone does not enter Washington’s income-tax base. Federal AMT can still apply. That distinction survives the start of Washington’s tax in 2028.
A sale before satisfying the two-year period from ISO grant and one-year period from share transfer is generally disqualifying. Ordinary compensation generally reflects the exercise spread, subject to the limitation for certain sales below exercise-date FMV; additional gain can be capital gain. A 2027 exercise followed by a taxable disqualifying sale in 2028 can produce Washington ordinary income in 2028.
Holding through December 31 does not lock in a qualifying ISO disposition. The two statutory holding periods must still be met. Nor does long-term treatment automatically avoid Washington tax: ESSB 6346 §302 removes federal long-term gains and losses, then conditionally adds back Washington capital gains plus the capital-gains deduction when capital gains tax is owed. Section 205 provides a limited nonrefundable credit for that year’s capital gains tax. QSBS requires its own tests.
The AMT Trap: Don't Overlook Federal Planning
ISO exercise can create federal AMT before the employee has sale proceeds. Compare the total tax and cash requirements under exercise-and-hold, exercise-and-sale and staged-exercise scenarios. A 2027 ISO exercise should not be justified by claiming its spread will automatically become Washington-taxable in 2028.
Federal individual AMT generally uses 26% and 28% rates, but the computation accounts for the exemption, phaseout, capital-gain rules, credits and regular tax. A $500,000 ISO spread can create a $500,000 adjustment; multiplying it by 28% does not establish a $140,000 AMT bill. Use the applicable tax year’s Form 6251 rules and filing status rather than treating the adjustment as the final tax base.
Spreading exercises across different tax years can change annual AMT. Spreading identical amounts across quarters of the same calendar year does not by itself reduce annual AMT; it may change payment timing or expose the employee to different share values. Model the year’s total income and exercise spread.
Early Exercise and Section 83(b) Elections: The Accelerated Path
If the plan permits early exercise, you may acquire unvested stock and consider a §83(b) election. It applies to the stock transfer, not the unexercised option. The ordinary deadline is 30 days after transfer, subject to applicable weekend, holiday or specific statutory relief.
For early-exercised NSOs, a timely §83(b) election generally includes transfer-date FMV minus the exercise price; no additional compensation arises solely when those shares later vest. For early-exercised ISOs, the election operates for AMT and does not override the ISO holding-period or disqualifying-disposition rules. A 2027 election is not a blanket exemption for all later events.
For example, early exercise of an NSO at a $2 strike when the shares’ FMV is $2 produces zero elected compensation and a $2 stock basis. A later sale at $10 produces $8 gain per share before selling costs. Whether that gain is long-term or qualifies for §1202 depends on the applicable holding periods and other requirements.
The catch: you need the cash to exercise, and you need to believe in the company's long-term value. Early exercise is a bet on the business.
Liquidity Constraints and The Real-World Problem
The biggest issue with exercising options before 2028—whether ISOs or NSOs—is cash. Most employees can't simply write a check for hundreds of thousands of dollars to exercise options. You need either liquid assets, a loan against future stock, or a way to exercise and sell simultaneously.
Same-day-sale or broker-assisted exercise requires an actual permitted market or buyer; it is generally unavailable at a private company without a liquidity transaction. A permitted net exercise is different and needs tax analysis. Financing an exercise creates repayment and investment risk; verify the loan and transfer terms before relying on it.
Underwater options can be legally exercisable but economically unattractive: the strike exceeds current share value. A sale restriction can prevent monetizing shares without preventing exercise. Distinguish exercise rights, sale rights and the cash required for each.
The QSBS and Section 1202 Connection
Under §1202, acquisition date controls the holding-period tiers and dollar-limit regime, including applicable tacking. Post-July 4, 2025 acquisitions can receive 50% exclusion at three years, 75% at four and 100% at five; the $15 million dollar limit is indexed after 2026 and coordinated with prior issuer-specific exclusions, with a 10-times-basis alternative. Earlier acquisitions generally require more than five years and use the older dollar limit and vintage-dependent percentage. Separately, the $75 million gross-assets threshold applies to stock issued after July 4, 2025; the prior threshold is $50 million.
For vested shares acquired by cash exercise in 2027, the post-2025 regime can reach the three-, four- and five-year anniversaries in 2030, 2031 and 2032. A 2028 acquisition shifts those anniversaries one year later; it does not lose §1202 eligibility merely because Washington’s income tax has begun. Unvested shares require separate §83 and ISO analysis.
QSBS eligibility also depends on original issuance, issuer assets at issuance, qualified business activity and the other §1202 conditions. The exclusion shelters eligible capital gain within its limits, not compensation already recognized on an NSO exercise. Keep the relevant issuance and company records.
NSO Exercise Timing: The Straightforward Calculation
For NSOs, compare the taxable compensation recognized in each proposed year. Washington base income starts with federal AGI and the statutory modifications; Washington taxable income is computed after the additional deductions. The 2028 $1 million deduction is shared by spouses and registered domestic partners, rather than applied separately to each grant.
A potential 9.9% marginal state-tax saving is one input, not a directive to exercise. Compare exercise cost, federal tax, expected income, company risk, sale restrictions and the possibility that later exercise would also fall below the Washington threshold.
A prior-year minimum-tax credit under §53 generally offsets regular tax only to the extent permitted above tentative minimum tax; it does not offset future AMT. ISO-related deferral items can generate a credit, but recovery depends on later returns and is not an immediate refund. Use Form 8801 and model other income and credits together.
The 2027 Planning Window
The planning window runs through December 31, 2027. This is not infinite runway, but it is enough time if you move deliberately.
Here's what that window demands: meet with your tax advisor and your company's legal team now. Understand your option grants, the current fair market value, your future compensation, and your likely tax bracket. Model out the federal, state, and self-employment tax consequences of exercising different blocks of options in different years. Understand any transfer restrictions, blackout periods, or company policies that might prevent you from exercising.
If you need loans to exercise, apply for them now so the company can process them. If you're considering early exercise, start that conversation with your company. If you want to do a coordinated exercise and sale, begin discussing that structure with your broker or company.
Don't wait until November 2027 to start thinking about this. The most tax-efficient structures take time to implement.
The Interaction with QSBS and Entity-Level Planning
Earlier share acquisition can start relevant holding periods sooner and can occur while the issuer still satisfies the gross-assets test. It does not increase every basis measure or guarantee an exclusion. A qualifying 2028 acquisition can also receive §1202 benefits. See the QSBS guide for the acquisition-date regimes and issuer tests.
Similarly, if you're a founder considering entity structure or conversion, the interaction with Washington's income tax matters. Read our guide to entity choice under Washington income tax to understand whether your entity structure affects your option planning.
Your Pre-Year-End Checklist
Before exercising, identify the option type, strike, share FMV, vesting and expiration dates. Calculate federal regular tax, AMT and potential credits, plus Washington tax under explicit year and residency assumptions. Confirm cash for exercise and taxes, sale restrictions and any §83(b) deadline. For QSBS, check issuance eligibility and the applicable three-, four-, five- or more-than-five-year holding rule. Coordinate the exercise with the company’s authorized administrators.
This is not a tax return checklist. This is a planning checklist to be completed well in advance of the year-end deadline.
A Final Word on Interaction with Other Tax Planning
Coordinate option exercises with other recognition events, such as taxable Roth conversions. Combining them in 2027 may increase federal tax, but it cannot trigger a Washington income tax that starts in 2028. Combining taxable amounts in 2028 or later can affect the Washington base and deduction. Estate and liquidity planning should be modeled separately rather than assuming every event has the same tax treatment.
These interactions underscore a key principle: option exercise timing is not an isolated tax decision. It's part of a broader landscape that includes federal taxes, state taxes, estate planning, and business circumstances. The best outcome requires coordinating with your tax advisor and perhaps your legal counsel on all of these dimensions.
The Bottom Line
The pre-2028 window can matter for NSO compensation that would otherwise face Washington income tax. ISO exercise-and-hold, disqualifying sales, QSBS holding periods and later capital gains each have different rules. Choose the exercise date using a combined tax-and-liquidity model, not a universal “exercise by 2027” rule.
The best time to make this decision was months ago. The second-best time is now. Don't let the 2028 income tax surprise you.
Related Posts
Section 83(b) Elections: What Startup Founders and Employees Need to Know
Washington's Millionaires Tax: What Founders Need to Know
Before you exercise, review residency and income sourcing. Nonresident compensation for Washington services can remain taxable under ESSB 6346 §403; the capital-gains rule for a later stock sale is a separate analysis. See Washington’s residency and domicile guide.
Qualified Small Business Stock and Options
C-Corp vs S-Corp vs LLC: Washington Income Tax Implications
Roth Conversions Before 2028: Washington Income Tax Considerations
Estate Planning Before 2028: How Washington's Income Tax Changes the Calculus
Employee Stock Ownership
- 409A Valuations: What Every Startup Needs to Know
- ISO vs. NSO: Complete Guide to Stock Options
- Equity Compensation Plan Design
- Washington's New Income Tax: The Complete Guide
This post is for educational purposes only and is not legal or tax advice. Consult a qualified attorney about your specific situation.
If you're a startup founder, employee, or investor with options in a Washington-based company and you're unsure how to approach this planning, let's talk. Book a free introductory call and we can walk through your specific situation and options.
