Equity
Double-Trigger RSUs and the 2026 IPO Window: When the Second Trigger Finally Fires
Double-trigger RSUs stay untaxed until your startup exits. As the 2026 IPO window reopens, here is how the second trigger, taxes, and your 409A collide.
By 409.AI Team - 2026-08-03
# Double-Trigger RSUs and the 2026 IPO Window: When the Second Trigger Finally Fires
For years, the double-trigger RSU was a quiet promise. Employees at late-stage startups collected grants, watched them "vest" on a schedule, and felt no richer and owed no tax. The shares were real on paper and imaginary in every practical sense, because a second condition had to be met before anyone owned anything. That second condition is a liquidity event, and for a long stretch after 2021 it simply wasn't happening.
That's changing. The IPO market has come back to life, with 2025 raising more capital than any year outside the 2021 peak and a deep bench of late-stage companies now looking ready to list. If you hold double-trigger RSUs, the trigger you've never thought much about is the one about to fire, and it arrives with a tax bill that surprises people every single cycle.
Here's how the instrument actually works, what happens the day the second trigger hits, and why your company's valuation still sits underneath the whole thing.
What "double-trigger" actually means
A restricted stock unit is a promise to deliver shares in the future. It isn't stock, and that distinction drives everything that follows. A single-trigger RSU has one condition, usually time-based vesting, and settles into shares as it vests. Public companies use single-trigger RSUs because their employees can immediately sell shares to cover the tax.
Private companies can't offer that. If an RSU settled into stock while the company was still private, the employee would owe ordinary income tax on shares they couldn't sell to pay the bill. So private companies add a second condition. A double-trigger RSU requires both time-based vesting and a liquidity event, typically an IPO or an acquisition, before any shares are delivered. Both triggers have to be satisfied. Time-vesting alone does nothing.
Until that liquidity event, the units sit under what the tax code calls a substantial risk of forfeiture. Nothing is taxable while that risk is in place, which is exactly why the structure exists. The employee gets equity upside without a phantom tax bill on shares locked in a private company.
One consequence that catches people off guard: because a secondary sale or tender offer usually doesn't count as the liquidity trigger, double-trigger RSU holders often can't participate in private-market liquidity the way option holders can. If your company runs a [tender offer that resets its 409A](https://409.ai/articles/tender-offers-secondary-sales-409a-valuation), your vested-but-unsettled RSUs typically sit it out.
The tax hits at settlement, all at once
When both triggers are met, the RSUs settle and the tax arrives. Under Section 83, the fair market value of the delivered shares becomes ordinary compensation income the moment the shares are no longer subject to a substantial risk of forfeiture. Per IRS Publication 525, that value runs through your Form W-2 exactly like salary. It's subject to federal and state income tax, Social Security tax up to the annual wage base, Medicare tax, and the extra 0.9% Additional Medicare Tax on wages above $200,000.
Work a real number. Say you have 20,000 double-trigger RSUs, fully time-vested, and your company IPOs at a $30 settlement price. That's 20,000 × $30 = $600,000 of ordinary income landing in a single year, on top of your salary. If you later sell at $40, the additional $10 per share is a capital gain, and your holding period for long-term treatment starts at settlement, not at grant.
The part that stings is withholding. Employers withhold on supplemental wages like RSU income at a flat 22% federal rate, and 37% only on aggregate supplemental wages above $1 million. If you're a high earner in the 35% or 37% bracket, 22% withholding on the first million leaves a real shortfall, and you cover it the following April. On a $600,000 RSU settlement, 22% withholding is $132,000, but your actual federal tax on that income could be closer to $200,000 depending on your bracket. That gap is yours to fund.
There's no way to soften the timing the way early-stage equity holders sometimes can. You cannot file an [83(b) election on an RSU](https://409.ai/articles/the-83b-election-explained-for-founders), because there's no property to elect on at grant. An RSU is a contractual promise, not transferred stock, so Section 83's early-election mechanism simply doesn't apply. That's the sharpest line between RSUs and the restricted stock or early-exercised options that founders use. It's also why the [83(i) election](https://409.ai/articles/83i-election-qualified-equity-grant-tax-deferral), which was designed to defer tax on private-company equity, exists as a separate and narrow safety valve rather than something built into the RSU itself.
If you also hold options, the taxation is a different animal. Worth understanding both, since many employees carry a mix; the [ISO versus NSO breakdown](https://409.ai/articles/iso-vs-nso-how-stock-options-are-taxed) covers how option grants get taxed and why the rules diverge so far from RSUs.
Why Section 409A quietly shapes the whole design
This is where valuation and structuring meet, and where a lot of plans get into trouble. Double-trigger RSUs are deferred compensation, so they live in the shadow of Section 409A, the same regime behind [nonqualified deferred compensation plans](https://409.ai/articles/409a-nonqualified-deferred-compensation-plans).
The catch is that an IPO is not a permissible payment event under Section 409A. The statute allows payment only on a fixed date or schedule, separation from service, death, disability, an unforeseeable emergency, or a change in control. An IPO is none of those, and it doesn't qualify as a change in control. So a plan can't simply say "we'll pay when we go public" and leave it there.
Most companies solve this by fitting the RSUs inside the short-term deferral exemption, which keeps them outside 409A entirely. To qualify, the plan must settle the units no later than the 15th day of the third month after the year in which the substantial risk of forfeiture lapses. In plain terms, once the liquidity event removes the forfeiture risk, the shares have to be delivered within roughly two and a half months. That's why RSUs frequently settle right around the IPO date or shortly after the lockup, rather than on some open-ended future date.
There's a second-order problem. If the liquidity event never comes, the forfeiture risk never lapses, and the units could theoretically hang around forever, which threatens the whole exemption. To keep the structure clean, many plans give double-trigger RSUs a fixed outside term, often seven years, after which unsettled units expire. It's not a detail employees usually notice, but it's the reason your grant may quietly vanish if your company stays private long enough.
If a plan instead settles on a fixed date, say six months after an IPO once the lockup ends, the RSUs are no longer exempt and must comply with 409A's payment rules directly. Both approaches are legitimate. Both require care, and getting it wrong exposes employees to a 20% additional 409A penalty tax, which is precisely the outcome the structuring is meant to avoid.
The valuation underneath it all
Every one of these mechanics runs on a fair market value number, and for a private company that number comes from a defensible [409A valuation](https://409.ai/articles/what-is-a-409a-valuation-a-comprehensive-guide). If your RSUs settle in an acquisition while the company is still private, the ordinary income you recognize is measured against the deal price and the company's FMV, not a public quote. Even at IPO, the last private 409A frames the runway leading up to the offering, which is why 409A timing matters to anyone holding equity into a listing.
The company has its own accounting to manage. Under ASC 718, an RSU conditioned on a liquidity event carries a performance condition that generally isn't considered probable until the event actually occurs. So no compensation expense gets recognized while the company is private, and a large catch-up charge lands in the period the IPO or acquisition closes. Finance teams modeling that hit lean on the same equity and valuation inputs, which is why [ASC 718 expensing](https://409.ai/articles/asc-718-stock-based-compensation-startup-guide) and the 409A are so tightly linked. Employees feel the tax; the company feels the expense; both trace back to the settlement-date value.
If you want to see what your equity is actually worth before the trigger fires, the mechanics of [409A value for employees](https://409.ai/articles/understanding-409a-valuation-for-employees) are the right starting point. The headline number on your grant is a promise. The real figure is whatever the shares are worth the day they settle.
What to do before your second trigger fires
If your company looks like a 2026 or 2027 listing candidate, treat the liquidity event as a tax event you can plan for, not a windfall you react to. Add up your time-vested double-trigger RSUs and multiply by a realistic settlement price to estimate the ordinary income you'll recognize in that year. Assume the 22% withholding will fall short if that income pushes you into the top brackets, and set aside cash for the April gap. Check your plan document for the settlement window and any outside term, because those two clauses decide when and whether you get paid. And remember that the day the shares settle is the day your capital-gains clock starts, so a decision to hold for long-term treatment is a decision to keep public-market risk.
The second trigger has been dormant for a lot of people for a long time. As the IPO window reopens, it's about to become the most consequential line in your equity package. Understanding it now, while it's still theoretical, beats meeting it for the first time in a settlement statement.
*Sources: IRS Publication 525 (taxable and nontaxable income); Internal Revenue Code Sections 83, 409A, and 3401 supplemental wage withholding rules; FASB ASC 718; public guidance from Baker McKenzie and Skadden on Section 409A treatment of double-trigger RSUs. This article is educational and not tax or legal advice.*