Double-Trigger RSUs and an IPO

Your company has just filed its S-1, and the RSUs in your offer letter are suddenly close to becoming real. Most pre-IPO grants use "double-trigger" vesting, which means the vesting schedule you have been tracking is only half the story — nothing is delivered, and nothing is taxed, until a second condition is met as well. This article explains what double-trigger vesting means, when the tax bill actually arrives once your company goes public, what a sell-to-cover at settlement looks like, and how the lock-up period that follows should change how you plan.

What does double-trigger vesting mean?

A double-trigger RSU grant has two separate conditions that both have to be satisfied before you actually own anything: a time-based vesting condition, which works like a normal multi-year vesting schedule, and a liquidity-event condition, typically defined as the company completing an IPO or being acquired. Meeting the time-based condition alone does not deliver shares and does not create a tax event — it only means that portion of your grant is "vested" in the scheduling sense, waiting on the second condition. Private companies use this structure specifically to avoid a problem double-trigger vesting was designed to solve: without a liquidity condition, ordinary single-trigger vesting would create taxable compensation income years before you have any way to sell shares to pay the tax, since there is no market for private stock. By tying the tax event to an actual liquidity event, double-trigger vesting keeps your tax bill lined up with the first moment you could realistically raise cash to pay it. Until both conditions are met, you have not received property for tax purposes at all — you simply hold a promise that becomes real only when the company goes public or is acquired.

When do I owe tax if my company goes public?

Tax is not triggered by the IPO announcement, the S-1 filing, or the first day of public trading by itself — it is triggered by settlement, the moment your double-trigger RSUs actually convert into shares you own. Exactly when settlement happens depends on how your specific plan defines the liquidity-event condition: some plans settle immediately at the IPO for units that already passed their time-based vesting date, some settle on a delayed schedule shortly afterward, and others are written to settle only once the post-IPO lock-up period expires. Whenever settlement happens, the fair market value of the shares on that settlement date is ordinary compensation income, reported on your W-2 exactly like a normal RSU vest — there is no special IPO tax treatment that reduces or defers it further. Because settlement can land on a date you do not fully control, and because a newly public company's share price is often volatile in its first weeks of trading, the dollar amount of income you recognize can differ significantly from what you estimated while only watching the S-1 process. Check your specific plan documents for the exact settlement trigger rather than assuming the IPO date itself is the tax date.

What is a sell-to-cover at IPO, and can I opt out?

When your double-trigger RSUs settle, your employer still owes the same withholding obligation it would owe on any other RSU vest, and at a newly public company that almost always means a mandatory sell-to-cover: the plan automatically sells a portion of your newly settled shares on your behalf and remits the proceeds as withholding, then deposits the remaining shares into your brokerage account. A handful of plans instead withhold shares directly rather than selling them (net share settlement), which produces the same after-tax result through a slightly different mechanism. In either case, expect materially fewer shares to land in your account than the number that technically settled, and that gap is not a mistake — it is the withholding your employer is required to collect. Employees rarely get a genuine opt-out of this process at a newly public company, because the administrative and cash-flow burden of collecting withholding any other way is significant, and because trading in the stock immediately around settlement is often restricted anyway. If your plan documents describe an alternative such as paying withholding from other funds, confirm the mechanics and deadline directly with your equity administrator well before your expected settlement date, since the default sell-to-cover happens automatically if you take no action.

How does the lock-up period change my planning?

A lock-up period is a contractual restriction the underwriters impose on company insiders and employees, typically written into the IPO underwriting agreement, that prevents you from selling shares on the open market for a period set by that agreement even though you already own them. This is entirely separate from the tax question: your tax bill on double-trigger RSUs is fixed at settlement, based on the share price on that date, regardless of whether the lock-up allows you to sell that day or months later. That separation cuts both ways. If the stock rises after settlement, you already paid tax on the lower settlement-date value and simply have a larger unrealized gain waiting for the lock-up to lift. If the stock falls, you already paid tax on a value you can no longer fully realize by selling, since the price has moved and you were not free to sell during the gap. Because you cannot control the stock price on the day the lock-up expires, the more useful planning question is what you intend to do the moment you can sell — decide before the lock-up lifts, rather than in the middle of whatever the market is doing that week.

What if the liquidity event never comes?

Not every double-trigger grant results in an IPO or acquisition — a company can stay private indefinitely, be wound down, or restructure its equity plan entirely, and in any of those outcomes the liquidity-event condition may simply never be satisfied. Because both conditions must be met before you own anything, RSUs whose time-based condition has been satisfied but whose liquidity condition never occurs are not taxed at any point along the way — there is no partial ownership and no partial income to report for the time-vested-but-unsettled portion. If your employment ends, or the company's equity plan expires or is terminated, before the liquidity condition is met, those units are typically forfeited outright rather than paid out, and forfeiture of an already-taxed asset is not what happens here, since nothing was ever taxed. One planning move that is not available to you here is an 83(b) election: that election applies to actual property you have received subject to a substantial risk of forfeiture, and an unsettled double-trigger RSU is not property you have received at all — it is only a contractual promise — so there is nothing to elect on.

Key numbers (2026)

• Flat withholding rate on supplemental wages — the IRS sets a flat 22% federal withholding rate for supplemental wages, including RSU settlements, up to $1,000,000 of supplemental wages in the calendar year (IRS Pub 15).
• Mandatory rate above $1,000,000 — once your cumulative supplemental wages for the year cross $1,000,000, the excess must be withheld at a mandatory flat rate of 37%, the top individual income-tax bracket, instead of the standard 22% (IRS Pub 15).
• When RSU income is taxed — at settlement, when both vesting conditions are met, not at grant; §83(b) is unavailable before settlement because you have not yet received property (IRS Pub 525).
• Long-term holding period — a later sale of settled shares qualifies for long-term capital gains treatment once you have held them for more than one year from settlement (IRS Topic No. 409).
• Social Security wage base — Social Security withholding stops once your year-to-date wages cross the 2026 Social Security wage base of $184,500 (IRS Pub 15).

Current as of 2026-09

Sources

• IRS Publication 15 (Circular E), Employer's Tax Guide — https://www.irs.gov/publications/p15
• IRS Publication 525, Taxable and Nontaxable Income — https://www.irs.gov/publications/p525
• IRS Topic No. 409, Capital Gains and Losses — https://www.irs.gov/taxtopics/tc409

Sample content for demonstration purposes — not financial advice.