Millionaire Advisor Match

RSU & Stock Options Tax Planning for $1M–$5M Investors: 2026 Guide

For many $1M–$5M investors, equity compensation was the vehicle — RSUs that vested during a hot market, ISOs exercised at the right time, or ESPP shares compounding for years. That's how the balance sheet crossed seven figures. The complication: equity comp carries some of the most expensive tax traps in the code. RSUs are withheld at 22%, which is likely below your marginal rate. ISOs can trigger a six-figure AMT bill in a single exercise year with nothing sold to pay it. Understanding the rules isn't optional at this asset level.

RSUs: ordinary income at vesting, withholding gap at high incomes

When a restricted stock unit vests, the fair market value of the shares on vest date is ordinary compensation income — reported on your W-2, subject to federal income tax, Social Security, and Medicare taxes, exactly as if your employer had written you a check for that amount.1

The trap: employer withholding on supplemental wages (RSUs, bonuses) defaults to a flat 22%.2 If your marginal rate is 24%, 32%, or 35%, you're under-withheld on every vest event. In 2026, the 24% bracket begins at $211,401 of taxable income for married filers ($105,701 for single).3 Engineers, managers, or executives earning $250K–$500K base — common at the $1M–$5M wealth tier — will frequently land in the 32% bracket by the time RSU income is added. The tax owed on a $150K vest at 32% is $48,000; the withholding covers $33,000. The $15,000 gap is an underpayment problem every April.

Fix the withholding gap. Supplement through W-4 additional withholding or quarterly estimated payments (Form 1040-ES). Miss both and you may owe a penalty on top of the tax. An advisor who works with equity-comp clients will set this up at onboarding.

Basis after vest. Your cost basis in RSU shares is the FMV at vest — the same amount you paid income tax on. This matters when you sell. If you hold shares beyond vest date and they appreciate further, only the post-vest gain is taxable. If you hold 12+ months after vest, that gain is taxed at the lower long-term capital gains rate (0%, 15%, or 20% in 2026, depending on income).4 The most common mistake: forgetting that basis is not zero and overpaying capital gains tax on the sale.

ISO vs. NSO: the choice that changes everything

Companies grant two types of stock options. The tax treatment is entirely different.

FeatureIncentive Stock Options (ISO)Non-Qualified Stock Options (NSO)
Who can receiveEmployees onlyEmployees, contractors, directors
Tax at exerciseNo regular income tax — but bargain element is an AMT preference item5Spread (FMV minus exercise price) is ordinary income + FICA taxes at exercise6
Qualifying disposition2 yrs from grant + 1 yr from exercise → all gain is LTCGNo qualifying disposition — always ordinary income at exercise
Disqualifying dispositionSpread at exercise becomes ordinary income; post-exercise gain is LTCGN/A (always ordinary at exercise)
AMT riskHigh — large exercises in one year can create six-figure AMT billsNone — ordinary income at exercise; AMT doesn't apply
$100K annual limitMax $100K in ISOs can become exercisable in a single calendar year5No limit

ISOs: the qualifying disposition strategy and the AMT trap

ISOs have a compelling upside: if you exercise and hold at least two years from the grant date and one year from the exercise date (a "qualifying disposition"), the entire spread — from exercise price to sale price — is taxed as long-term capital gains. No ordinary income. No FICA. In 2026, that means 15% or 20% instead of 32%–37% for high earners. On a $500K gain, the difference is over $60,000 in tax.

The catch is the AMT. The bargain element (FMV at exercise minus exercise price) is excluded from regular income but counted as a tax preference item for AMT purposes. If you exercise a large block of ISOs and hold them past December 31st, you've created AMTI without cash to pay it — because you haven't sold anything yet.

In 2026, the AMT exemption is $90,100 for single filers and $140,200 for married filers, with phaseout starting at $500,000 (single) / $1,000,000 (MFJ).7 The One Big Beautiful Bill Act (July 2025) reset the MFJ phaseout threshold to $1M and changed the phaseout rate to 50%, meaning high earners lose $1 of exemption for every $2 of AMTI above the threshold. AMT is applied at 26% on the first $244,500 of net AMTI, 28% on the rest.

The 2022 cautionary tale. Tech employees who exercised large ISO blocks at high 2021 valuations and held through December 31st faced enormous AMT bills in April 2022 — often on stock worth a fraction of the exercise-date FMV after the 2022 correction. They owed tax on phantom income. The AMT credit (Form 8801) eventually recovers the overpayment, but only as regular tax exceeds tentative AMT in future years — which can take a decade.

ISO AMT Exposure Calculator — 2026

Enter your income and planned ISO exercise to see your estimated AMT exposure and how many shares you can exercise before triggering incremental AMT.

Uses 2026 AMT exemption ($90,100 single / $140,200 MFJ) and phaseout thresholds ($500K/$1M) per IRS inflation adjustments for 2026 (IRS Rev. Proc. 2025-67). AMT phaseout rate 50% per OBBBA (P.L. 119-21). AMT rates: 26% on first $244,500 / 28% above. Regular tax uses 2026 brackets per IRS Rev. Proc. 2025-32 and 2026 standard deduction ($32,200 MFJ / $16,100 single). Does not account for state AMT, itemized deductions, AMT credits from prior years, or other preference items. Use for directional planning only.

Disqualifying dispositions: sometimes the right call

A disqualifying disposition — selling ISO shares before meeting the 2-year/1-year holding periods — converts the spread at exercise from an AMT preference item to ordinary income. That sounds bad, but it can be better than triggering a massive AMT bill on shares you haven't sold.

The math: if your ordinary income marginal rate is 32% and your LTCG rate would be 20%, the qualifying disposition saves 12 percentage points on the spread. But if a qualifying disposition means holding through AMT calculation, paying a 26–28% AMT rate now, and waiting years to recover the credit — a disqualifying disposition that converts the gain to ordinary income (paid immediately, no AMT) may cost less overall. The comparison depends on your specific income, the bargain element size, and the timeline for AMT credit recovery.

Same-year exercise and sale. Exercising ISOs and selling in the same calendar year is always a disqualifying disposition, but it eliminates the AMT preference item — because you never "held" the shares past year-end. If you're concerned about large AMT exposure, this can be a clean way to capture the gain at ordinary income rates without the AMT credit recovery wait.

NSOs: simpler, no AMT, ordinary income at exercise

Non-qualified stock options are straightforward. When you exercise an NSO, the spread (FMV minus exercise price) is ordinary income — subject to federal income tax at your marginal rate, and FICA taxes if you're an employee.6 Your cost basis in the shares is the FMV at exercise. Post-exercise appreciation held 12+ months qualifies for LTCG treatment at sale.

NSOs have no $100K annual grant limit (ISOs do), no AMT complication, and can be granted to non-employees — so they're common for contractors, advisors, and directors. The tax planning is simpler: time exercises to lower-income years when your marginal bracket is lowest, spread large exercises across calendar years to avoid bracket stacking, and pair with harvested losses to offset the ordinary income where possible.

ESPP: the 15% discount is just the beginning

Employee Stock Purchase Plans let employees buy company stock at a discount — typically 10–15% — through after-tax payroll deductions. A qualifying ESPP offers a 15% discount with a lookback to the beginning of the offering period, meaning the effective discount can be much larger if the stock rose.

The tax treatment depends on holding period:

For high earners at $1M–$5M, the ESPP mechanics matter less than the concentration risk. An ESPP automatically increases your employer-stock concentration every six months. If you're already holding significant RSUs or options in the same company, ESPP shares compound the single-stock exposure. The standard advice: sell ESPP shares on the purchase date (disqualifying disposition, full ordinary income) to capture the guaranteed discount and immediately diversify, rather than holding for the LTCG treatment while accumulating more concentration.

Planning framework: what to do with equity comp at $1M–$5M

RSUs: sell to diversify, then invest deliberately

RSUs vest as ordinary income regardless of what you do next. There is no tax reason to hold RSU shares after vest unless you have strong conviction in the company. Holding vested RSUs is a new investment decision — you're choosing to hold a concentrated single-stock position with after-tax dollars. If you wouldn't buy that much of the stock today with cash from your bank account, you shouldn't hold it in RSU form. See our concentrated stock guide for tax-efficient ways to unwind a position that has grown.

ISOs: model before exercising

The ISO decision requires running the actual AMT numbers before acting. Key questions:

  1. What is my projected full-year AMTI (other income + bargain element)?
  2. After the phaseout, how much AMT exemption do I have left?
  3. Does the tentative minimum tax exceed my regular tax — and by how much?
  4. How long will it take to recover the AMT credit?
  5. Is the LTCG benefit of holding worth the AMT cost and the stock price risk?

Early in the year, projecting these numbers is easier because you know your salary and can estimate your vest schedule. Q4 exercises after the stock has moved are harder to model. Use the calculator above for a directional answer; a fee-only advisor who works with equity-comp clients will model this precisely before you act.

TLH pairing: offset ordinary income gains

RSU vest income and NSO exercise gains are ordinary income — capital losses cannot directly offset them. But capital losses reduce capital gains, which reduces taxable income, which may shift you into a lower bracket for RSU/NSO income. If you're harvesting losses in your taxable account (see our tax-loss harvesting guide), coordinate the timing with major vesting events to maximize the bracket-management benefit. In a year with a large RSU vest pushing you into 35%, a $50,000 harvested capital loss eliminates $50,000 of other capital gains, which frees up bracket room — saving up to 22 percentage points on that $50K compared to holding the position.

Charitable giving: donate appreciated shares, not cash

If you have RSU or ESPP shares that have appreciated since vest, donating them directly to a donor-advised fund (DAF) eliminates the capital gains tax on the appreciation. You get a deduction for the full FMV at the time of contribution (subject to the 30% AGI limit for publicly traded stock). This is always more tax-efficient than selling the shares, paying LTCG tax, and donating cash.

Related tools on this site. Equity comp creates concentrated positions — see Concentrated Stock Diversification for the full playbook. RSU income can be offset by tax-loss harvesting strategy. Large exercise years interact with asset location decisions. A fee-only advisor integrating all of these is the right call when equity comp is driving your wealth trajectory.

Get matched with a fee-only advisor for equity comp planning

ISO AMT modeling, RSU withholding gaps, concentrated-stock unwinding — these require a specialist who has run these numbers before. A fee-only advisor who works with $1M–$5M equity-comp clients will have a framework for this and won't have a reason to recommend you hold more of your employer's stock.

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Sources

  1. IRS Publication 525 — Taxable and Nontaxable Income; RSU income recognized at vesting as ordinary compensation income equal to FMV of shares at vest date: irs.gov/pub/irs-pdf/p525.pdf.
  2. IRS Publication 15 (Circular E), §7 — Supplemental wages withholding: flat 22% on supplemental wages up to $1 million; 37% above $1 million aggregate supplemental wages in the year: irs.gov/publications/p15.
  3. IRS Rev. Proc. 2025-32 — 2026 income tax bracket thresholds and standard deduction ($32,200 MFJ / $16,100 single): irs.gov/pub/irs-drop/rp-25-32.pdf. 24% bracket begins at $211,401 taxable income for MFJ ($105,701 single); 32% begins at $403,551 MFJ ($201,776 single).
  4. IRC §1222 — Holding period requirements for long-term capital gain treatment (12+ months). 2026 LTCG rates 0%/$98,900 / 15%/$613,700 / 20% above for MFJ per IRS Rev. Proc. 2025-32. NIIT 3.8% on NII above $250,000 MFJ / $200,000 single per IRC §1411.
  5. IRC §422 — Incentive stock options: qualifying disposition requirements (2-year/1-year holding periods), $100,000 annual exercisability limit, employee-only eligibility, no regular income at exercise, AMT preference item treatment of bargain element: law.cornell.edu/uscode/text/26/422.
  6. IRC §83 — Property transferred in connection with performance of services: NSO spread at exercise is ordinary income equal to FMV minus exercise price; employer withholding required for employees; basis equals amount included in income: law.cornell.edu/uscode/text/26/83.
  7. IRS 2026 AMT exemption amounts per IRS inflation adjustments for tax year 2026 (IRS newsroom, IRS Rev. Proc. 2025-67): $90,100 single / $140,200 MFJ. Phaseout thresholds reset to $500,000 (single) / $1,000,000 (MFJ) per One Big Beautiful Bill Act (P.L. 119-21, July 2025); phaseout rate 50%. AMT rates: 26% on first $244,500 of net AMTI / 28% above. See also IRS Topic No. 556: irs.gov/taxtopics/tc556.

RSU and NSO tax treatment verified against IRC §§ 83, 422 and IRS Pub. 525. AMT exemption and phaseout values verified against IRS 2026 inflation adjustments and OBBBA. 2026 ordinary income brackets verified against IRS Rev. Proc. 2025-32. Values current as of May 2026.