Severance After Acquisition / Change of Control — Single-Trigger vs Double-Trigger

Who this applies to#

When your company is acquired or merges with another entity, your severance and equity rights may change dramatically depending on two variables: whether your equity is single-trigger or double-trigger, and whether the total value of your contingent CIC compensation pushes you into the IRC § 280G golden parachute regime. This page focuses on the single-trigger vs double-trigger decision framework and the § 280G excise tax calculation. For a broader introduction to § 280G basics and the $1M+ withholding cliff that applies to all executive severance, see the related page on executive severance above $1 million. The stakes are highest for vice presidents, senior directors, and above who hold significant unvested equity. A VP with $500,000 in unvested RSUs and a $350,000 base salary may find that a change of control pushes their total contingent compensation well past the 3× trigger — generating a 20% non-deductible excise bill on the excess and leaving the acquirer unable to deduct much of the payout. Understanding the structure of your awards before a deal closes is essential.

What changes for you#

The § 280G calculation has two distinct thresholds, and confusing them is a costly mistake. The trigger threshold — the point at which the golden parachute rules engage at all — is 3× the executive's base amount (the average annualized W-2 compensation from the company over the five taxable years preceding the year of the CIC). Until total contingent CIC payments reach 3× the base amount, § 280G simply does not apply. But once that line is crossed, the excise tax under § 4999 applies to every dollar above 1× the base amount — not just to dollars above 3×. For example: if your base amount is $200,000 and your total contingent CIC payment is $700,000, the trigger is met (3× base = $600,000; $700,000 exceeds it). The excise applies to $700,000 minus $200,000 (1× base) = $500,000 of "excess parachute payments" at 20%, generating a $100,000 non-deductible excise obligation stacked on top of ordinary income tax. Single-trigger vs double-trigger determines when unvested equity vests — and therefore when its value must be included in the § 280G calculation. Under a single-trigger structure, all unvested shares vest automatically at deal close, regardless of whether you are retained by the acquirer. The fair market value of that accelerated equity is a contingent payment for § 280G purposes, counted in the 3× threshold calculation. Single-trigger awards are common in older equity plans and in some private-company option grants; institutional proxy advisors (ISS and Glass Lewis) now advise against approving new single-trigger grants at public companies as a governance concern. Under a double-trigger structure, unvested equity accelerates only if two events occur: (1) a qualifying change of control and (2) a qualifying termination of employment within a specified window (typically 12 to 24 months after deal close). A qualifying termination usually means involuntary termination without cause or a constructive dismissal — defined as a material reduction in salary, title, responsibilities, or a forced relocation beyond a defined distance. If the acquirer retains you in a comparable role, your double-trigger awards do not accelerate and you receive nothing extra from the CIC. This is good for the acquirer (you stay working) but creates risk for you if the acquirer gradually reduces your role without triggering the formal constructive-dismissal definition. Treasury Regulation 26 CFR § 1.280G-1 defines change in control for § 280G purposes using three categories: (1) change in ownership (one person or group acquires more than 50% of the total fair market value or voting power of stock), (2) change in effective control (one person or group acquires 20% or more of the voting power within a 12-month period — the parallel § 409A change-of-control regulation under 26 CFR § 1.409A-3(i)(5)(vi)(A) uses a higher 30% threshold — or a majority of the board is replaced in a 12-month period without incumbent-board approval), and (3) change in ownership of substantial assets (acquisition of 40% or more of the gross fair market value of all corporate assets within a 12-month period). These are the same categories that trigger § 409A's permissible-distribution event for CIC payments, which is why § 280G and § 409A must be analyzed together for executives with deferred compensation. SEC Item 402(j) of Regulation S-K requires that public company registrants quantify in their annual proxy statement (DEF 14A) the payments and benefits each named executive officer would receive upon termination, including in connection with a change of control. This disclosure must separately identify and value single-trigger and double-trigger payments and must be made on an assumed termination date of the last business day of the fiscal year.

Decision tree#

1. If Your equity award agreement says shares vest "upon a Change in Control" without requiring any additional event

   Then → You have single-trigger acceleration. All unvested shares vest at deal close. Add the fair market value of those shares to your total contingent CIC payment for § 280G analysis.

   Else: Your agreement likely requires double-trigger — verify that both a CIC and a qualifying termination (defined in the plan or award) are required.

2. If Your total contingent CIC compensation (severance cash + accelerated equity + benefits + any retention bonus) reaches or exceeds 3× your 5-year average W-2 compensation

   Then → § 280G is triggered. Every dollar above 1× your base amount is an "excess parachute payment" — non-deductible to your employer and subject to the 20% excise tax under § 4999. Model a cutback to just below 3× if the excise exceeds the value of the extra dollars.

   Else: § 280G does not apply. Your CIC payments are taxed at ordinary income rates with supplemental withholding only.

3. If You are a senior executive at a public company and your CIC payments will be disclosed in proxy

   Then → SEC Item 402(j) of Reg S-K requires quantified disclosure of all termination and CIC payments in the annual proxy statement (DEF 14A). This disclosure is public and will be reviewed by institutional proxy advisors (ISS, Glass Lewis). Structure your agreement accordingly.

   Else: Private company — Item 402(j) disclosure does not apply, but acquirer due diligence and representations in the merger agreement will identify all CIC obligations.

4. If Your CIC severance includes deferred compensation or installment payments that extend beyond the short-term deferral window

   Then → IRC § 409A applies. Change in control is a permissible distribution event under § 409A, but it must satisfy the Treasury's definition of a "change in the ownership or effective control" (substantially the same as § 280G triggers). A plan that relies on the CIC distribution trigger must be structured to match the § 409A regulatory definition — otherwise distributions are not permissible and a forced distribution would trigger the 20% § 409A penalty plus interest.

   Else: Payments within the § 409A short-term deferral safe harbor (2½ months after close of the taxable year in which the right vested) are not subject to § 409A timing rules.

Calculate your numbers#

Inputs default to federal assumptions; adjust to your specifics.

Action steps#

• Pull every equity award agreement and identify whether each grant is single-trigger or double-trigger. Look for language like "upon a Change in Control" (single) versus "upon a Change in Control and a qualifying termination" (double).
• Calculate your § 280G base amount: sum your W-2 Box 1 compensation from the five most recent taxable years before the CIC year and divide by 5. If you have fewer than 5 years, use your actual years of employment.
• Add all contingent CIC payments: severance cash, accelerated equity at fair market value, COBRA subsidy, any retention bonus, and any deferred compensation triggered by the CIC. Compare the total to 3× base amount. If total exceeds 3×, model the 20% excise on amounts above 1× base.
• Negotiate a cutback clause or gross-up before signing. A cutback reduces your total payment to just below 3× base to avoid triggering the regime. A gross-up pays you additional compensation to offset the excise — but gross-ups are increasingly disfavored by ISS/Glass Lewis and rare in new agreements.
• If you have double-trigger equity, read the constructive dismissal definition carefully. Negotiate to include: salary reduction of more than 10%, material reduction in target bonus or equity grant, title or reporting-structure reduction, or forced relocation of more than 35 miles. A narrow constructive-dismissal definition is the acquirer's tool to retain you without triggering acceleration.
• Confirm § 409A compliance for any deferred or installment CIC payments — the change-in-control distribution event must satisfy 26 CFR § 1.409A-3(i)(5), which uses the same three-category framework as § 280G but with specific percentage thresholds.
• Have an executive compensation attorney or tax advisor experienced in M&A conduct a § 280G calculation before deal close — post-close corrections are extremely difficult and are often addressed in the merger agreement representations and warranties.

FAQ#

What is the difference between the § 280G trigger and the § 4999 excise base?

These are two distinct thresholds. The 3× base amount is the trigger: if your total contingent CIC payments stay below this number, § 280G does not apply at all. Once total payments equal or exceed 3× base, the excise tax under § 4999 applies — but to amounts exceeding 1× the base amount, not just to amounts above 3×. So if your base amount is $200,000 and you receive $650,000 in CIC payments, the regime is triggered (3× = $600,000 < $650,000) and the 20% excise applies to $650,000 - $200,000 = $450,000 in "excess parachute payments."

My stock plan says it is double-trigger but the constructive dismissal definition is narrow. What can I do?

Negotiate the definition before signing. Common constructive dismissal triggers include: (a) base salary reduction of more than 10%, (b) target annual bonus opportunity reduced below a set percentage, (c) material reduction in equity grant level, (d) material diminution in title, authority, or responsibilities, (e) requirement to relocate more than 35 miles. If your plan definition is narrower — for instance, limited to termination without cause and excluding constructive dismissal entirely — ask to amend it in the merger agreement side letter or change-in-control agreement.

Is a retention bonus paid at deal close included in the § 280G calculation?

Yes, if payment is contingent on the change of control. A retention bonus that is paid at deal close or within a defined period after close is a "contingent payment" for § 280G purposes and is counted toward the 3× threshold. If the retention bonus would be owed regardless of the CIC (e.g., it was promised before any acquisition was contemplated and has no CIC-contingent clause), it may not be contingent — but the burden is on you to prove it would have been paid absent the CIC.

Does a change of control at a private company trigger § 280G?

Yes, unless the company is eligible for the shareholder approval exception. Privately held companies whose stock has not been readily tradable on an established securities market may be able to avoid § 280G excise by obtaining shareholder approval for the excess parachute payments pursuant to the procedure in § 280G(b)(5). This requires a vote by more than 75% of the voting power of all outstanding stock (excluding shares held by the executive or related parties). Many private-company CIC transactions include a § 280G shareholder approval vote for this purpose.

What is the SEC required to disclose about my CIC payments?

Item 402(j) of Regulation S-K (17 CFR § 229.402(j)) requires public-company registrants to provide a table in their annual proxy statement (DEF 14A) quantifying all payments and benefits each named executive officer would receive upon various termination scenarios — including termination in connection with a change of control, both single-trigger and double-trigger. The disclosure must be made as of the last business day of the fiscal year and use the stock price as of that date for equity valuation.

Can I negotiate a gross-up for the § 4999 excise tax?

Technically yes, but in practice gross-ups are increasingly rare. ISS (Institutional Shareholder Services) and Glass Lewis, the leading proxy advisory firms, recommend against approving new change-of-control agreements with § 280G gross-up provisions, and most public companies have eliminated them from new executive agreements following heightened shareholder scrutiny. Gross-ups are somewhat more common in private company CIC agreements where proxy-advisor pressure is absent.

My employer cut my title and moved my reporting line after the acquisition. Does that trigger my double-trigger CIC benefits?

It depends on how "constructive dismissal" is defined in your award agreement or change-in-control agreement. If the agreement specifies that a material reduction in authority, duties, or title constitutes Good Reason or a constructive termination, and if you followed the required notice and cure procedures, you may have a double-trigger acceleration event. Most agreements require you to provide written notice of the constructive dismissal within 30–90 days of the triggering change and allow the company a 30-day cure period. Failure to follow procedure will usually waive the claim.

Sources#