A liquidity event is a transaction that turns privately held equity into cash or publicly tradable shares, and understanding liquidity event taxes matters because federal, state, and surtax layers can claim 30% or more of what you receive. How much you actually keep depends on three things: the type of equity you hold, how long you’ve held it, and whether special provisions like Qualified Small Business Stock apply. The same underlying payout can produce dramatically different tax bills for two people at the same company.
What Counts as a Liquidity Event
Most liquidity events fall into one of a few paths, and each affects the timing and character of the income you’ll be taxed on.
An acquisition is the most common exit for venture-backed companies. A buyer purchases the private company, and shareholders receive cash, stock in the acquiring company, or a mix. Cash puts money in your pocket at closing; stock consideration defers your real cash realization until you sell the buyer’s shares. The acquiring company typically assumes outstanding equity and options, either cashing them out or converting them into new awards. Unvested shares are usually canceled or rolled into a new vesting schedule.
An IPO lists the company’s shares on a public exchange for the first time. The listing alone doesn’t hand insiders a check. Founders, executives, and employees are bound by a lock-up agreement that prevents them from selling shares for a set period after the offering, typically 180 days.1Investor.gov. Initial Public Offerings: Lockup Agreements Your actual liquidity arrives when the lock-up expires and you can sell on the open market, at whatever the price happens to be then.
A direct listing lets a company go public without issuing new shares or using underwriters. Existing shareholders sell directly on the exchange starting on the first day of trading. The practical difference from an IPO for tax planning is timing: direct listings generally have no lock-up period, so insiders can sell on day one.
You don’t always have to wait for an IPO or acquisition. A tender offer is a company-organized transaction where employees can sell a portion of their vested shares back to the company or to outside investors, often during a new funding round. SEC rules require a tender offer to remain open for at least 20 business days.2eCFR. 17 CFR 240.14e-1 Companies commonly limit employees to selling 10% to 25% of their vested holdings. Secondary market sales to private buyers are also possible, though shareholder agreements typically include a right of first refusal and require board approval.
What You Actually Receive Before Tax
Before you can calculate tax, you need to know what you’re actually getting. Two features of most private-company exits reduce the number the IRS will eventually tax.
In an acquisition, the total sale price doesn’t get split evenly. A contractual payment order called the liquidation waterfall pays preferred shareholders first. A 1x non-participating preference lets an investor either take back their original investment or convert to common and share proportionally, whichever is larger. A 1x participating preference is more aggressive: the investor gets their investment back and then also shares in the remainder. In a modest exit, common shareholders can end up with little after the waterfall runs.
Even once your share is determined, you probably won’t receive all of it at closing. Buyers routinely place 10% to 15% of the total deal value in escrow for 12 to 24 months to cover post-closing claims. An earn-out ties a portion of the price to future performance targets, typically over one to three years. If a meaningful chunk of your deal value is structured as an earn-out, treat it as uncertain income until the targets are met, and expect it to be taxed in the year each payment is received, not at closing.
2026 Long-Term Capital Gains Rates
The single biggest factor in your tax bill is whether your gain is long-term or short-term. Long-term capital gains apply to assets held longer than one year and are taxed at significantly lower rates than ordinary income.3Internal Revenue Service. Topic No. 409, Capital Gains and Losses For 2026, the federal long-term capital gains rates are:4Internal Revenue Service. Revenue Procedure 2025-32
- 0% rate: Taxable income up to $49,450 (single), $98,900 (married filing jointly), or $66,200 (head of household).
- 15% rate: Taxable income from $49,451 to $545,500 (single), $98,901 to $613,700 (married filing jointly), or $66,201 to $579,600 (head of household).
- 20% rate: Taxable income above $545,500 (single), $613,700 (married filing jointly), or $579,600 (head of household).
Most people going through a significant liquidity event will land in the 20% bracket for at least part of their gains. State income taxes add another layer, ranging from 0% in states with no income tax to over 13% in the highest-tax states. Short-term gains, meaning gains on shares held one year or less, are taxed at ordinary income rates instead.
How Each Equity Type Is Taxed
The tax treatment of your payout depends heavily on how you came to hold the underlying shares. The rules differ sharply across the four common instruments.
Incentive Stock Options
ISOs offer the best potential tax treatment of any equity compensation, but only if you follow the rules precisely. No ordinary income tax is owed when you exercise ISOs. To qualify for long-term capital gains treatment when you sell, you must hold the shares for at least one year after exercising and at least two years after the original grant date.5Office of the Law Revision Counsel. 26 USC 422 – Incentive Stock Options Selling before either deadline is a disqualifying disposition, and the spread between your exercise price and sale price gets taxed as ordinary income.
The hidden danger with ISOs is the Alternative Minimum Tax. When you exercise, the spread between the exercise price and the stock’s fair market value counts as income for AMT purposes, even though it’s not taxed as regular income. If the spread is large enough, this triggers a substantial AMT bill in the year of exercise, before you’ve sold a single share. For 2026, the AMT exemption is $90,100 for single filers and $140,200 for married couples filing jointly.6Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Employees at fast-growing startups regularly get blindsided: they exercise, owe a five- or six-figure AMT bill, and can’t sell the stock to pay it because the company is still private.
Non-Qualified Stock Options
NSOs are more flexible than ISOs since they can be granted to consultants and board members, but the tax treatment is less favorable. The spread between fair market value and exercise price is taxed as ordinary income the moment you exercise, whether or not you sell.3Internal Revenue Service. Topic No. 409, Capital Gains and Losses For employees, the company withholds income and payroll taxes on the spread. For non-employee recipients, the income is reported on a 1099 and no withholding occurs.
Any additional appreciation after exercise is a capital gain. Hold the shares more than a year after exercising and that subsequent gain qualifies for long-term rates. Sell within a year and it’s taxed at short-term rates.
Restricted Stock Units
RSUs are a promise to deliver shares once they vest, with no purchase involved. When your RSUs vest and shares are delivered, the full fair market value on the delivery date is taxed as ordinary income. The company typically withholds by holding back shares, so you receive fewer than the number that vested. If there’s a gap between vest date and delivery date, the taxable amount is based on the price at delivery.
Once ordinary income tax is paid at vesting, your cost basis is the fair market value on the delivery date. Hold the shares more than a year after delivery and additional gain is long-term. Sell within a year and it’s short-term.
Restricted Stock and the Section 83(b) Election
If you receive restricted stock (not RSUs, but actual shares subject to a vesting schedule), you can file a Section 83(b) election to pay ordinary income tax on the stock’s value at the time of the grant rather than at each vesting date.7Office of the Law Revision Counsel. 26 USC 83 If the stock is worth very little at grant, as is common at early-stage startups, the tax bill at that point is minimal. All future appreciation then qualifies as capital gain rather than ordinary income when you sell.
The deadline is strict. You must file within 30 days of receiving the stock.8Internal Revenue Service. Section 83(b) Election Form Miss it by a day and the election is permanently unavailable for that grant. The risk: if you file an 83(b), pay tax on the value, then leave before vesting, you forfeit the unvested shares and get no deduction for the tax you already paid. For early employees with very low share prices, the math almost always favors filing. For later-stage grants worth significant amounts, the calculus is more complicated.
Qualified Small Business Stock (Section 1202)
Section 1202 offers a potentially massive benefit: up to 100% exclusion of federal capital gains tax on qualifying stock.9Office of the Law Revision Counsel. 26 USC 1202 The 2025 One Big Beautiful Bill Act expanded these benefits for stock issued after July 4, 2025.
To qualify, the stock must be in a domestic C corporation that had no more than $75 million in gross assets at issuance (up from $50 million for stock issued before July 5, 2025). The corporation must use at least 80% of its assets in an active trade or business, excluding industries like finance, law, and hospitality. You must have acquired the stock at original issuance, not through a secondary purchase.
For stock issued after July 4, 2025, the exclusion follows a tiered schedule based on holding period:
- 3 to 4 years: 50% of the gain excluded, with the non-excluded portion taxed at 28% rather than the usual long-term capital gains rate.
- 4 to 5 years: 75% excluded, non-excluded portion also at 28%.
- More than 5 years: 100% excluded.
The maximum excludable gain per issuer is $15 million for stock issued after July 4, 2025, up from $10 million under prior law. These caps begin adjusting for inflation starting in 2027. For founders and early investors at qualifying startups, QSBS is one of the most valuable provisions in the code, and its interaction with the structure of an exit is worth planning around years before any liquidity event is on the horizon.
The 3.8% Net Investment Income Tax
Capital gains from a liquidity event are subject to an additional 3.8% surtax called the Net Investment Income Tax if your modified adjusted gross income exceeds certain thresholds. For 2026, the NIIT kicks in above $200,000 for single filers, $250,000 for married couples filing jointly, and $125,000 for married individuals filing separately.10Office of the Law Revision Counsel. 26 USC 1411 These thresholds have not been adjusted for inflation since the tax was created in 2013.
The NIIT applies to the lesser of your net investment income or the amount by which your modified AGI exceeds the threshold.11Internal Revenue Service. Topic No. 559, Net Investment Income Tax Anyone realizing a significant gain will almost certainly exceed these thresholds. Combined with the 20% long-term rate and state taxes, the total effective rate on a large gain can easily reach 30% or more.
Golden Parachute Rules for Executives
Executives receiving large payouts in connection with an acquisition may run into a separate excise tax. When severance, accelerated vesting, and other payments to an executive exceed three times their average annual compensation, the excess is classified as an “excess parachute payment.” The executive owes a 20% excise tax on the excess, and the company loses its tax deduction for those amounts.12Internal Revenue Service. Golden Parachute Payments Guide This mostly affects C-suite officers and other highly compensated individuals, and it can take a real bite out of what looks like a generous exit package.