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Part 11 · Chapter 3

The Unified Plan Rule and Participating-Employer Failures

Law stated as of October 3, 2026 · Multiple-Employer and Small-Employer Arrangements

Scope and status

This chapter covers the "one bad apple" (unified plan) rule for multiple employer plans, the SECURE Act statutory exception at Code §413(e), and the operative sequence by which a plan administrator or pooled plan provider addresses an unresponsive participating employer under the proposed regulations — notices, deadlines, remedial action, employer-initiated spinoff, and the involuntary spinoff-and-distribution endgame. Scope discipline: MEP architecture and §413(c) mechanics are in the MEP structure chapter; PEP and pooled plan provider requirements are in the PEP chapter; correction of the underlying qualification failure itself runs through EPCRS and is routed to Part 21 (Plan Corrections: EPCRS, VFCP, and DFVCP). Authority caution: the operative rules in Part C are a proposed regulation.

Sections

Part A is shown in full. The other sections are listed by title; their text is available to subscribers.

Part A — The Unified Plan Rule

A1.The rule

Part 11, ch. 3, § A1

A multiple employer plan is treated as a single plan for qualification purposes, so a failure by one participating employer to satisfy an applicable qualification requirement causes the plan to fail that requirement with respect to every employer maintaining it. Final reg: Treas. Reg. §1.413-2(a)(3)(iv).

A2.What disqualification would actually mean

Part 11, ch. 3, § A2

Disqualification retroactively removes the plan's tax-favored status: the trust's income becomes taxable; employer contributions made in non-qualified years become taxable to participants as they vest (§402(b)(1)); highly compensated employees are taxed on their entire vested accrued benefit if one reason for disqualification is a §401(a)(26) or §410(b) failure (§402(b)(4)(A)), while non-HCEs escape inclusion when such a failure is the sole reason (§402(b)(4)(B)); rollovers made from the plan are invalid, and employer deductions are recharacterized. Statute: Code §§401(a), 402(b), 404(a)(5), 501(a).

A3.What the rule does not reach

Part 11, ch. 3, § A3

The unified plan rule addresses qualification under the Code. It does not make participating employers jointly liable for each other's fiduciary breaches, and it does not aggregate employers for purposes that are determined employer-by-employer under §413(c) (coverage, nondiscrimination, top-heavy, deductions); §415 is a separate rule that does count contributions from all participating employers (Treas. Reg. §1.415(a)-1(e)). Statute: Code §413(c); ERISA §§404, 405.

Part B — The §413(e) Statutory Exception

  1. B1Which plans qualify for the exceptionSubscribers
  2. B2The statutory conditionsSubscribers
  3. B3Reliance pending final regulationsSubscribers

Part C — The Proposed Regulation: Prop. Treas. Reg. §1.413-3

  1. C1What the plan document must saySubscribers
  2. C2What counts as a participating employer failureSubscribers
  3. C3The notice sequence and the clocksSubscribers
  4. C4The two ways an employer avoids the endgameSubscribers
  5. C5The endgame if the employer does nothingSubscribers
  6. C6The effect on everyone elseSubscribers

Part D — Practice Points

  1. D1The exception is not a correction programSubscribers
  2. D2The final notice is a referral to DOLSubscribers
  3. D3Put the sequence in the participation agreementSubscribers
  4. D4For the employer that receives a first noticeSubscribers

The first Part of each chapter is open to everyone. The remaining sections, with their authority and practice points, are available to subscribers and to clients of ERISA Benefits Law Group, PLLC whose engagement includes access.

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