What is a 409A change in control? Definition, how it works and examples
When an acquisition counts as a payment event under 409A — the ownership, effective-control and asset tests, and why plan wording has to match them.
The short answer
A 409A change in control is one of three corporate events — a change in ownership, a change in effective control, or a change in ownership of a substantial portion of the assets — that Treasury Regulation §1.409A-3(i)(5) allows to trigger payment of deferred compensation. A deal that misses those tests is not a payment event, whatever the deal documents call it. For founders and employees of a private company, this is the definition that decides whether a deferred bonus, a retention award or a transaction bonus is paid when the company is sold.
How does a 409A change in control work?
The statute lists a change in control as one of six events on which Section 409A lets deferred pay be paid, but only “to the extent provided by the Secretary”. The regulation supplies the detail, and it sets three conditions before the tests are even applied. Objectively determinable The event must be a fact anyone can check. If a committee must certify that it happened, the certification has to be purely ministerial, with no discretion.
The 409A definition of change in control: three tests
Change in ownership A change in ownership happens on the date one person or group acquires stock that, with what they already hold, is more than 50% of the total fair market value or the total voting power of the corporation. A holder who is already over 50% and buys more does not cause another one. The test applies only where the company’s stock stays outstanding after the deal; a sale of the business’s assets is measured by the third test instead.
409A change in control definition vs Section 280G, as of October 2026
Deal lawyers meet a second definition of “change in control” in the same transaction: Section 280G, the golden-parachute rule. The two look alike and are not. A deal can be a 280G change without being a 409A payment event — see the sale of 35% of assets in the example below.
Example of a 409A change in control: five deals, five answers
A private company’s chief financial officer has $600,000 of deferred bonus payable “on a change in control event within the meaning of Section 409A”. The company has $1 billion of gross assets. Here is what happens to her payment under five different transactions. Had the division sale been $450 million — 45% of gross assets — it would have been a change in control and her bonus would be paid. When the answer is no, the money is not lost: it stays deferred until the next permitted event in the plan, such as a fixed date or her separation from service.
Key risks and common mistakes
Borrowing a broader definition An employment agreement that pays deferred amounts on “a sale of 25% of the assets” or “a change of the CEO” uses an event the regulation does not recognise. That is a plan failure, not a generous term. Mixing up 409A and 280G A deal can be a parachute event under 280G and not a payment event under 409A. Each clause has to cite the right one.
The terms this page uses
Change in control event Any of the three events in Treas. Reg. §1.409A-3(i)(5): change in ownership, change in effective control, or change in ownership of a substantial portion of assets. Group Persons who act together in a merger, acquisition or similar transaction with the company. Buying at the same time or in the same offering is not enough. Gross fair market value The value of assets without deducting the liabilities attached to them — the basis of the 40% test.
What people ask about 409A change in control
Is an IPO a 409A change in control? Normally not. Investors who buy in the same public offering are not treated as a group, so no person crosses the thresholds. An IPO matters to 409A for a different reason: it switches on the six-month delay for specified employees. Can my plan define change in control more broadly than the regulation? No, not for a payment of deferred compensation. It may pay on fewer kinds of event, or set higher thresholds, but every event it uses must meet the regulation’s test. Does a large venture round count?
Is an IPO a 409A change in control?
Normally not. Investors who buy in the same public offering are not treated as a group, so no person crosses the thresholds. An IPO matters to 409A for a different reason: it switches on the six-month delay for specified employees.
Can my plan define change in control more broadly than the regulation?
No, not for a payment of deferred compensation. It may pay on fewer kinds of event, or set higher thresholds, but every event it uses must meet the regulation’s test.
Does a large venture round count?
Only if one investor or a group acting together reaches more than 50% of value or voting power, or 30% of voting power within 12 months. A typical round spread across several investors does not.
What if the deal is not a change in control?
The deferred amount is not paid on the deal. It stays in the plan until the next event the plan permits, such as a fixed date, separation from service or death.
Is the 409A definition the same as in my option agreement?
Not necessarily. Option and RSU vesting clauses often use their own definition, which is fine for vesting. It is the payment of deferred compensation that has to follow the 409A definition.
Where every rule on this page comes from
Every threshold was checked against the statute and the Treasury regulations on 2 October 2026. The full text of the three tests is in Treas. Reg. §1.409A-3(i)(5). The example is illustrative, not market data.