How Do I Avoid Big Tax Mistakes With Tech Equity?
Last reviewed: July 2026
You avoid big tech equity tax mistakes by understanding three triggers before you act: the AMT hit from exercising incentive stock options, the holding-period rules that separate cheap capital gains from expensive ordinary income, and the under-withholding that ambushes RSU recipients at tax time. Most tech equity tax mistakes come from acting first and calculating later. Reverse that order and you keep far more of your equity.
Key Takeaways
- Exercising incentive stock options can trigger Alternative Minimum Tax even when you sell nothing and receive no cash.
- The 2026 AMT exemption is $90,100 for single filers and $140,200 for joint filers, per the IRS.
- Selling ISO shares too early creates a disqualifying disposition, taxing your gain at rates up to 37% instead of 20%.
- RSUs are taxed as ordinary income at vesting, and the default 22% withholding often falls short for high earners.
- Planning equity moves across multiple tax years usually beats exercising or selling everything at once.
About the Author: Jeff Judge, CFP®, AEP®, ChFC®, CLU® is Managing Partner of Chesapeake Financial Planners in Forest Hill, Maryland. He has been helping families and business owners in Harford County and the Baltimore metro area navigate equity compensation and tax planning since earning his CFP® certification in 2013, by using Chesapeake Financial Planners’ signature process, the R.U.D.D.E.R. method™. Jeff has watched more than one engineer celebrate an ISO exercise in March and panic about a phantom AMT bill in April, and the cause is almost always the same: nobody ran the numbers first.
Tech equity is one of the few places where a single decision can swing your tax bill by tens of thousands of dollars. The grant looks like free money. The tax code disagrees. Here is how the most expensive mistakes happen and how to sidestep each one.
What Is the ISO AMT Trap and How Do I Avoid It?
The ISO AMT trap is the most common tech equity tax mistake. When you exercise incentive stock options and hold the shares, you owe no regular income tax on the gain. But the Alternative Minimum Tax, a parallel tax system run by the IRS, treats the spread between your strike price and the fair market value as taxable income. You can owe a large bill on paper gains you never cashed out.
Here is the math. Say you exercise 10,000 ISOs with a $5 strike price when the fair market value is $35. The bargain element is $30 per share, or $300,000. That entire amount counts as income for AMT purposes. At a 28% AMT rate, the exposure approaches $84,000, and you have not sold a single share or received a dollar of cash.
The cruelest version: if the stock drops before you sell, you can still owe AMT on a gain that has since evaporated. Jeff Judge has seen this exact sequence cost clients real money during downturns.
To avoid the ISO AMT trap, run the calculation before you exercise. Use the 2026 AMT exemption of $90,100 for single filers or $140,200 for joint filers to gauge how much room you have. Exercise in tranches across multiple tax years to stay under the threshold where the 28% AMT rate kicks in, which the IRS sets at $244,500 for 2026. Never exercise more than you can cover with cash set aside for the tax. For the full mechanics, see What Is Alternative Minimum Tax and How Do I Avoid It?.
What Is a Disqualifying Disposition and Why Does It Cost So Much?
A disqualifying disposition happens when you sell incentive stock option shares before meeting the IRS holding requirements, which converts your favorable long-term capital gains treatment into ordinary income. To keep the preferential rate, IRS rules require you to hold the shares at least one year from the exercise date and at least two years from the grant date. Miss either window and the tax bill jumps.
The difference is stark. Qualifying ISO gains are taxed at long-term capital gains rates, topping out at 20%. A disqualifying disposition taxes the spread at ordinary income rates, which reach 37% for top earners, plus a possible 3.8% net investment income tax. On a $200,000 gain, that gap can exceed $30,000.
To avoid a disqualifying disposition, track your exercise and grant dates carefully and set calendar reminders for both qualification dates. Do not sell ISO shares inside the first year just because the price looks good. The tax savings from waiting often dwarf the short-term price move. If you are weighing the tradeoffs between option types before you exercise, What Is the Difference Between ISOs and NSOs? is the place to start.
How Are RSUs Taxed and Why Do People Get Surprise Bills?
Restricted stock units are taxed as ordinary income the moment they vest, based on the share price that day, and the surprise bills come from under-withholding. Unlike options, you do not choose when to recognize RSU income. Vesting is the taxable event whether you sell the shares or not.
The problem is the default withholding rate. Most employers withhold federal tax on RSU income at the supplemental wage rate of 22%, per the IRS. If your marginal tax rate is 35% or 37%, that leaves a gap you have to make up at filing. A six-figure RSU vest can easily produce a five-figure shortfall.
To avoid an RSU surprise, estimate your true marginal rate and plan to cover the difference between that rate and the 22% withheld. Some employers let you elect additional withholding or sell-to-cover at a higher rate. If not, set aside the gap in a separate account or make a quarterly estimated payment to the IRS. Jeff often tells clients with large RSU grants to treat every vest as a taxable event in real time, not a year-end cleanup problem. For a deeper walkthrough, see How Do I Avoid Surprise Tax Bills When My RSUs Vest?.
How Should I Plan Equity Moves Across Tax Years?
You plan equity moves across tax years by spreading exercises and sales so no single year pushes you into the AMT zone or a higher bracket. Concentration is the enemy. Exercising every ISO in one year, or selling a full RSU position alongside a bonus, stacks income and inflates the rate you pay on the top dollars.
The fix is sequencing. Exercise ISOs in tranches sized to stay under your AMT threshold. Time RSU sales and option exercises around lower-income years, such as a sabbatical, a job transition, or a year before a big raise. Coordinate with capital loss harvesting elsewhere in your portfolio to offset gains.
This is where a defined process helps. The R.U.D.D.E.R. Method™ is Chesapeake Financial Planners' six-step planning process: Review and Recognize, Uncover and Understand, Design and Develop, Discuss and Decide, Execute and Empower, and Reassess and Refine. Applied to equity, it forces you to map every grant, model the tax in advance, and decide before a deadline forces your hand. For the broader timing framework, see What is a year-round tax planning calendar for retirees and pre-retirees?.
Frequently Asked Questions
Does exercising incentive stock options trigger taxes if I do not sell?
Yes, exercising incentive stock options can trigger Alternative Minimum Tax even if you never sell the shares. The spread between your strike price and the fair market value counts as income for AMT purposes. You can owe a substantial tax bill on paper gains while receiving zero cash from the transaction.
What happens to my stock options if I leave my company?
When you leave your company, you typically have a limited window, often 90 days, to exercise vested options before they expire worthless. Some agreements use shorter windows of 30 days. Read your specific plan document, mark your final day, and count forward so you do not forfeit valuable vested equity by missing the deadline.
Why do I owe more tax on my RSUs than my employer withheld?
You owe more because employers typically withhold federal tax on RSU income at the supplemental rate of 22%, while your actual marginal rate may be 35% or 37%. RSUs are taxed as ordinary income at vesting. The gap between what was withheld and what you owe shows up as a balance due when you file.
How long do I have to hold ISO shares to get the lower tax rate?
To qualify for long-term capital gains treatment on incentive stock options, you must hold the shares at least one year from the exercise date and at least two years from the grant date. Meeting both requirements keeps your gain taxed at rates up to 20% instead of ordinary income rates up to 37%.
Can I owe AMT on stock that later loses value?
Yes, this is one of the harshest tech equity tax mistakes. If you exercise ISOs and hold while the stock drops, you can still owe Alternative Minimum Tax on the original paper gain at exercise. The tax is calculated on the spread at exercise, not the later, lower value. Planning exercises carefully prevents this outcome.
Is it better to exercise all my options at once?
Usually not. Exercising all your options in a single year can stack income, trigger Alternative Minimum Tax, and push you into higher brackets. Spreading exercises across multiple tax years often lowers your total tax. The right approach depends on your strike prices, current income, and cash available to cover the tax.
Equity compensation rewards people who plan three steps ahead and punishes those who react to deadlines. At Chesapeake Financial Planners, we model these decisions with tech employees before the exercise window opens or the vest hits, not after the tax bill arrives. If you are sitting on options or RSUs and want a second set of eyes on the timing, a conversation costs you nothing. Visit chesapeakefp.com to learn more.
Want to go deeper? Our Tech Equity Tax Traps Guide walks through this step by step.
Disclosures
The information provided is for educational purposes only and should not be construed as investment advice. Investment strategies should be tailored to individual circumstances, risk tolerance, and goals. Past performance doesn't guarantee future results. Consult with qualified financial professionals regarding your specific situation.
This information is not intended to be a substitute for specific individualized tax, investment or legal advice. We suggest that you discuss your specific situation with a qualified tax, legal or financial advisor.
Advisors associated with Chesapeake Financial Planners may be either (1) LPL Financial Registered Representatives offering securities through LPL Financial, Member FINRA and SIPC, and investment advisor representatives offering investment advice through Great Valley Advisor Group; or (2) solely investment advisor representatives offering investment advice through Great Valley Advisor Group and not affiliated with LPL Financial. Great Valley Advisor Group, and Chesapeake Financial Planners are separate entities from LPL Financial.
