Equity Compensation: A Practical Guide to RSUs, ISOs, and NSOs

If a large share of your compensation arrives as company stock, your real income is larger than your paycheck suggests, and your tax situation is more complicated. Most equity-compensated high earners discover this the hard way, usually in April, when the tax bill arrives. This guide covers the three most common equity types (restricted stock units, or RSUs; incentive stock options, or ISOs; and nonqualified stock options, or NSOs), the rules that determine when and how much tax you owe, and the planning moves that can keep equity compensation from turning into a tax problem.

This page is about the tax side of how we plan: where each dollar sits and when income lands. For HENRYs (high-earners-not-rich-yet) with a large equity-comp component, the tax decisions made between ages 30 and 50 shape retirement income 20 or 30 years later.

RSUs: Restricted Stock Units

RSUs are the most common form of equity compensation at established public companies. The mechanic:

• Your employer grants you a number of shares that vest on a schedule (typically 4 years, with a 1-year cliff and quarterly or monthly vesting after).
• At each vesting event, the value of the vested shares is treated as ordinary income, the same as your salary. Your W-2 includes it. Federal income tax, state income tax, Social Security, and Medicare all apply.
• The company typically withholds shares to cover federal tax at the 22% supplemental rate (or 37% if your year-to-date (YTD) supplemental income exceeds $1M). Your marginal rate may be higher.

The default-withholding trap: A high earner in the 35% federal bracket has 22% withheld on RSU vests. The IRS expects you to pay the 13% gap yourself. For someone with $300k of RSUs vesting in a year, that is $39,000 of tax that wasn't withheld.

The usual fix is quarterly estimated tax payments sized to the "safe harbor" (the lesser of 90% of this year's tax or 100% of last year's, rising to 110% of last year's if your prior-year adjusted gross income, or AGI, was over $150,000), supplemented by extra withholding from your salary.

Once shares vest, they sit in your taxable brokerage account at a cost basis equal to the vesting-day value. Any subsequent gain or loss is capital gain or loss when you sell.

ISOs: Incentive Stock Options (and the AMT Trap)

ISOs are a tax-favored option type granted primarily by startups and some public companies. The mechanic is structurally different from RSUs:

• You receive a grant of options (the right to buy stock at a fixed "strike price") that vest on a schedule.
• You exercise the option to buy the shares, paying the strike price.
• The difference between strike price and fair market value at exercise (the "bargain element") is not taxed as regular income, which is the ISO advantage.
• But the bargain element is added to income for the Alternative Minimum Tax (AMT) calculation. If the AMT exceeds your regular tax, you owe the difference.
• When you later sell, the gain (if held long enough) is taxed as long-term capital gain.

The AMT trap: Exercise $200,000 worth of ISOs at a low strike price (say, $20,000 cost), and you have $180,000 of "bargain element" that doesn't show on your W-2, but it does trigger AMT. Your April tax bill can include AMT you weren't expecting, on stock you haven't sold.

Worse: if the stock then drops, you may have paid AMT on a paper gain that no longer exists. There is an AMT credit you can recover in future years, but the cash-flow problem can be severe.

California residents face a second layer. California has its own AMT (top rate 7%), and the ISO bargain element counts there too, even though California does not tax ISO exercise for regular income tax.

ISO holding rules (for the capital-gains treatment to apply):

• At least 2 years from grant date.
• At least 1 year from exercise date.

If you sell before either threshold, the bargain element is reclassified as ordinary income (a "disqualifying disposition"), undoing the ISO advantage. Startup employees who exercise before an initial public offering (IPO) and then sell soon after a tender offer often trigger disqualifying dispositions inadvertently.

NSOs: Non-Qualified Stock Options

NSOs are the simpler option type, common at public companies and used alongside ISOs at startups. The mechanic:

• You receive a grant with a strike price and vesting schedule.
• When you exercise, the bargain element (fair market value minus strike) is immediately taxed as ordinary income. It shows up on your W-2.
• Withholding applies at the 22% supplemental rate, like RSUs.
• Future appreciation after exercise is capital gain when you sell.

NSOs are tax-disadvantaged compared to ISOs (no AMT-favored treatment, no long-term-capital-gains conversion of the bargain element) but they have no holding-period requirement for their tax treatment to apply.

For most high earners, the decision between "exercise and hold" and "exercise and sell same-day" depends on conviction in the stock and ability to absorb the immediate tax hit.

10b5-1 Plans: Selling Without Insider-Trading Risk

If you have material non-public information about your company (and as a senior employee you often do, even without realizing it), selling stock can create insider-trading risk. The 10b5-1 plan is the official safe harbor:

• You set up a written plan in advance with your brokerage that specifies dates, prices, and/or amounts for future sales.
• You can't modify the plan once you have material non-public information.
• Trades execute according to the plan, regardless of what you learn between now and the trade date.
• Securities and Exchange Commission (SEC) rules updated in 2023 require a "cooling-off period" between adoption and the first trade: at least 90 days for directors and officers (up to 120 days, depending on the timing of the company's quarterly report), and 30 days for other employees.

For executives and senior employees with vesting RSUs, 10b5-1 plans are how you legitimately diversify without trading windows.

Concentrated Stock Position: Diversifying Without a Tax Bomb

After a few years of vesting at a successful company, a HENRY may end up with 60% to 80% of their net worth in a single stock. This is concentration risk: a single company's misfortune can wipe out years of compensation. The right answer is almost always to diversify. The problem is the tax bill on selling appreciated stock.

Options for unwinding a concentrated position:

1. Sell in tranches. Set a multi-year diversification schedule. Pair each tranche with tax-loss harvesting elsewhere in the portfolio to offset gains.
2. Donor-advised fund. Donate appreciated stock directly to a donor-advised fund (DAF). You get a deduction at fair market value (subject to limits based on AGI; starting in 2026, only the portion of an itemizer's charitable deductions above 0.5% of AGI counts), you avoid the capital gains tax, and the DAF distributes the gift over time on your schedule. Most efficient form of charitable giving for high earners with appreciated stock.
3. Exchange fund. A pooled-investment vehicle where you contribute concentrated stock and receive a diversified basket in exchange. Tax-deferred. Typically requires a 7-year hold and accredited-investor or qualified-purchaser status, depending on the fund. Useful for very large concentrated positions but illiquid.
4. Charitable remainder trust (CRT). Donate appreciated stock to a CRT, which sells tax-free, pays you an income stream for life or for a term of up to 20 years, and gives the remainder to charity. Complicated but powerful for very large positions.

The right answer depends on the size of the position, your charitable intent, and your time horizon. For most HENRYs, option 1 (tranched selling, with tax-loss harvesting to offset) is the right starting point.

How This Fits the Doctrine

Equity compensation sits squarely in tax planning. The decisions you make in your 30s and 40s (how aggressively to exercise ISOs, when to diversify, where to put proceeds) shape the tax picture you carry into retirement decades later.

Equity compensation can build wealth fast, and it builds it in one place. The work is to spread that growth across multiple wrappers (taxable, Roth, tax-deferred) and multiple holdings before your retirement income depends on it.

Frequently Asked Questions

Should I exercise ISOs as soon as they vest?

It depends on the AMT picture, your conviction in the stock, your ability to absorb the tax bill, and the 2-year/1-year holding requirements. The default-best move is usually to exercise just enough each year to stay under the point where AMT would exceed your regular tax, then sell after the qualifying-disposition window passes. For reference, the 2026 AMT exemption is $90,100 single / $140,200 married filing jointly, phasing out (at 50 cents per dollar) above $500,000 / $1,000,000 of AMT income.

What's the difference between ISO exercise & hold vs. ISO exercise & sell same-day?

Exercise & hold (followed by qualifying disposition): bargain element triggers AMT, but the eventual sale is long-term capital gain. Exercise & sell same-day: the sale within a year is a disqualifying disposition, the bargain element becomes ordinary income, and you've forfeited the ISO advantage. Same-day-sale ISOs are essentially NSOs with extra paperwork.

Are RSUs taxed twice?

No, but it can feel that way. The vest is taxed as ordinary income (correct). The subsequent sale generates a capital gain/loss based on the change in price since the vest (also correct). The cost basis equals the value at vest, so you are not double-taxed. If you don't track basis correctly, though, your 1099-B may overstate the gain.

What if my stock drops after I exercise ISOs?

You may have paid AMT on a bargain element that no longer exists in real dollars. You can recover the AMT via the AMT credit over future years (it can take a decade or more), but the cash-flow hit in the year of exercise can be severe. That risk is the strongest argument for cautious exercise spread over several years.

Should I sell at IPO or hold?

Start with your concentration risk at IPO and your multi-year unwind plan. Hold the high-conviction portion; diversify the rest on a deliberate schedule.

Can I do a Roth conversion with equity-comp money?

Not directly, because equity comp lands in taxable accounts. But equity-comp income raises your bracket, which can make a Roth conversion in the same year less attractive. Coordinate the two: convert in the lowest-bracket year you can find and steer clear of vesting-heavy years.

What to Do Next

What decides this for you. What share of your net worth sits in one company's stock, and whether that same company signs your paycheck. Those two facts together are the whole risk. A 40% position in a company you do not work for is a diversification problem. A 40% position in your employer is a diversification problem stacked on top of your income, your health insurance and your next promotion, all correlated to one earnings report.

Where it goes wrong. People treat the vest as the decision and the tax as paperwork that follows it. The costly mistakes are almost all timing. Default withholding on a vest is 22%, so a high earner in the 35% bracket is underwithheld by 13% and finds out in April. Exercising incentive options creates alternative minimum tax on a paper gain that may never turn into cash, which is how people end up owing tax on stock they still hold and cannot sell. And the most common one: deciding to finally diversify, then selling the whole position in a single tax year, which stacks every dollar of gain into the top bracket when it could have been spread across several.

Worth a conversation if single-company stock is more than roughly 25% of your net worth, you hold options you have not exercised, or you have a vest landing in the same year as anything else large. The sequencing across tax years drives the outcome, and it has to be planned across all your grants together. Book a call and bring your grant summary.

The information provided is for educational purposes only and does not constitute investment, legal, or tax advice. Tax law changes frequently, so verify current rules before acting. Consult with qualified professionals for guidance specific to your situation.