COBRA Obligations During Mergers and Acquisitions

Mergers and acquisitions create some of the most procedurally complex COBRA compliance situations employers face, because the transaction structure—asset sale versus stock sale—determines which entity carries COBRA liability for affected workers. Failing to assign that liability correctly can expose both selling and acquiring employers to excise tax penalties under Internal Revenue Code Section 4980B and civil enforcement under ERISA Title I. This page covers how COBRA obligations attach during M&A events, how liability transfers between parties, and the decision rules that govern common transaction structures.

Definition and scope

COBRA continuation coverage obligations during corporate transactions are governed primarily by the Employee Retirement Income Security Act of 1974 (ERISA), 29 U.S.C. § 1161 et seq., and by Treasury Regulation § 54.4980B-9, which addresses M&A-specific continuation coverage rules in a structured Q&A format. The full regulatory context for COBRA administration establishes that both the Department of Labor (DOL) and the Internal Revenue Service (IRS) share enforcement jurisdiction over these obligations.

The scope of COBRA's M&A provisions covers any transaction in which a business, or a portion of a business, changes hands—including stock acquisitions, asset purchases, divisional sales, mergers, and spin-offs. The central question in each case is whether the transaction produces a "qualifying event" by causing covered employees to lose group health plan coverage, and which employer is responsible for providing or funding the continuation coverage that follows.

Treasury Regulation § 54.4980B-9 draws a foundational distinction between two employer types:

Selling group: The employer (or group of employers under common control) that transfers the business or assets.
Acquiring employer: The employer that receives the business or assets.

This distinction directly controls which entity must offer COBRA and for how long.

How it works

The mechanism for assigning COBRA liability in M&A follows a structured three-step framework under Treas. Reg. § 54.4980B-9:

Identify the transaction type. Stock sales and asset sales operate under different default rules. In a stock acquisition, the acquired entity's plan typically continues uninterrupted, and no qualifying event is triggered by the transaction itself as long as coverage is maintained. In an asset sale, employees transferred to the buyer may lose coverage under the seller's plan, which can constitute a qualifying event.
Determine whether coverage is lost. A qualifying event occurs only if a covered employee or dependent loses group health plan coverage. If the acquiring employer maintains a group health plan and extends coverage to transferred employees without a gap, COBRA is not triggered. If coverage is not offered or there is a period without coverage, the loss triggers COBRA obligation.
Assign liability by agreement or by default rule. Under Treas. Reg. § 54.4980B-9, Q&A-8, the selling and acquiring employers may allocate COBRA responsibility by written agreement. In the absence of such an agreement, the default rule places the obligation on the selling group for M&A-generated qualified beneficiaries whose qualifying events occurred before or in connection with the sale.

The IRS and DOL have jointly clarified that both entities can face excise tax exposure under IRC § 4980B (which imposes a penalty of $100 per qualified beneficiary per day of noncompliance, up to a ceiling of $200 per day per family) when responsibilities are ambiguous or contractually unaddressed.

Common scenarios

Asset sale with no successor plan
When a buyer purchases assets only and does not establish a group health plan, transferred employees lose coverage under the seller's plan. This constitutes a qualifying event. Under the default rule of Treas. Reg. § 54.4980B-9, the selling employer retains COBRA obligation for those individuals. The seller's plan must send COBRA election notices within the standard 14-day window after the plan administrator is notified.

Asset sale with successor plan
If the acquiring employer maintains a group health plan and offers coverage to all transferred employees without a gap, no qualifying event occurs for those workers. COBRA liability for any existing COBRA participants (M&A qualified beneficiaries already on continuation coverage) passes to the acquiring employer by operation of the transaction if the parties execute a written agreement under Treas. Reg. § 54.4980B-9, Q&A-8(c).

Stock acquisition
In a pure stock deal, the acquired company remains a separate legal entity. Its existing health plan typically remains in place, no qualifying event is generated by the ownership change alone, and COBRA obligations flow through the acquired company's existing plan structure without interruption.

Partial sale or divestiture
When only a division or subsidiary is sold, employees in the divested unit may lose coverage under the parent's plan. This is treated like an asset sale scenario: the selling group holds default COBRA responsibility unless a written agreement transfers it to the acquirer. The COBRA obligations during mergers and acquisitions scenario involving partial divestitures is among the most commonly litigated, because plan administrator notice chains are frequently disrupted.

Decision boundaries

The following distinctions determine which rules apply and which party bears liability:

Factor	Selling Group Liability	Acquiring Employer Liability
Asset sale, no acquirer plan	Default: seller retains	No obligation unless agreed
Asset sale, acquirer covers all employees	Seller liable for pre-close M&A QBs	Acquirer liable if written agreement executed
Stock acquisition	N/A (no qualifying event)	Plan continues; acquirer holds all obligations
Written agreement present	As specified in agreement	As specified in agreement
No written agreement	Default: seller	None (unless coverage gap created)

A critical boundary involves M&A qualified beneficiaries—individuals already on COBRA at the time of the sale. Under Treas. Reg. § 54.4980B-9, Q&A-7, these individuals must be allowed to continue COBRA for the remainder of their maximum coverage period. If the acquiring employer's plan absorbs the obligation by agreement, that plan cannot impose new preexisting condition exclusions on M&A qualified beneficiaries that would not have applied under the seller's plan.

A second boundary separates pre-sale qualifying events from transaction-triggered qualifying events. Employees who lost coverage before the closing date are subject to the seller's COBRA framework. Employees whose coverage loss occurs as a direct result of the transaction follow the M&A-specific rules of Treas. Reg. § 54.4980B-9.

Employers navigating these obligations should also review the COBRA administration home for foundational compliance context, including how plan administrator responsibilities are defined and how notice timelines interact with transaction closing schedules. A failure to address COBRA liability allocation in the purchase agreement itself—before closing—is one of the most common sources of post-close compliance disputes documented in DOL enforcement records.

References

The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)