Short-Year Form 5500 Filing Requirements For Plans Joining a PEP

Short-Year Form 5500 Filing Requirements When a Plan Joins a Pooled Employer Plan (PEP)

May 7, 2026

article summary

• ERISA § 2520.104‑50 applies only when a subsequent Form 5500 exists
• A single employer plan merging into a PEP must file a final Form 5500
• If subject to audit, the short‑year Form 5500 must include audited financials
• Audit deferral is not permitted for a plan’s final filing
• A PEP cannot include pre‑merger financial activity of participating employers
• Administrative, onboarding, or participation dates do not create audit relief

Overview

When a single employer retirement plan joins a Pooled Employer Plan (PEP) mid‑year, the plan sponsor must file a final short‑year Form 5500 for the period ending on the date legal control transfers to the PEP.

A common mistake is assuming that ERISA’s short plan year audit deferral relief applies to this final short year. It does not. As a result, some plans file incomplete Forms 5500 without the required auditor’s report, creating compliance risk.

This guidance explains why ERISA short‑year audit deferral relief does not apply when a plan merges into a PEP, clarifies filing requirements, and highlights common misconceptions auditors and plan sponsors should avoid.

Does ERISA Short Plan Year Audit Deferral Apply When a Plan Joins a PEP?

Answer: No.

ERISA’s short plan year audit deferral relief does not apply when a single employer plan merges into a PEP because:

• The single employer plan has no subsequent Form 5500 filing
• The plan ceases to exist as a separate reporting entity
• The regulatory conditions for audit deferral cannot be satisfied

What Is ERISA Short Plan Year Audit Deferral?

ERISA Regulation § 2520.104‑50 permits an audit deferral only when a plan has two consecutive plan years, one of which is a short plan year of seven months or fewer.

Permitted Situations

Audit deferral is allowed only when the short plan year occurs because the plan:

• Is established or begins operations
• Is merged or consolidated with another plan
• Is terminated
• Has a change in plan year end

Required Conditions for Audit Deferral

To defer an audit under ERISA § 2520.104‑50, both of the following must be true:

1. First Year Form 5500 Requirements

The Form 5500 for the first (short) year must:

• Be complete and accurate
• Include all required schedules, except the IQPA report
• Include an explanatory attachment stating:
  • Why the year is seven months or fewer
  • That audited financial statements for both years will be included in the next Form 5500

(Note: ERISA-required supplemental schedules, such as Schedule H Line 4i, must still be included.)

2. Second Year Form 5500 Requirements

The immediately following Form 5500 must include:

• Financial statements and schedules for both plan years
• An IQPA report covering both years
• A statement explaining any material differences between unaudited and audited information

Why Audit Deferral Does NOT Apply When a Plan Joins a PEP

When a single employer plan merges into a PEP:

• The plan files a final Form 5500 for the short year ending on the merger date
• There is no “immediately following plan year” for that plan
• The second filing required by ERISA § 2520.104‑50 cannot exist

Because the deferral framework requires two consecutive filings for the same plan, audit deferral is not permitted.

Can a PEP Include the Prior Short‑Year Financials of the Single Employer Plan?

Answer: No.

A PEP’s financial statements:

• May only reflect activity after the employer becomes a participating employer
• Cannot include financial activity from periods before the merger
• Must not combine financial data from different reporting entities or periods

Including pre‑merger activity would improperly combine:

• Two different ERISA plans
• Two different reporting periods

This violates ERISA reporting principles and audit standards.

Common Misconceptions About Short-Year Audit Relief and PEPs

Plan management may incorrectly assume that:

• “If the plan merges into the PEP before July 31, the audit can be deferred”
• “Audit deferral applies anytime a plan year is seven months or fewer”
• “The PEP audit can cover the plan’s pre‑merger short year”

All of these assumptions are incorrect.

What Do the Form 5500 Instructions Say?

The Form 5500 instructions reinforce this conclusion:

• Line 3d(2) applies only when a plan defers an audit to a subsequent filing
• The instructions explicitly require the second Form 5500 to include:
  • Audited financial statements for both years

This structure presumes continued existence of the same plan, which does not occur after a merger into a PEP.

Final Form 5500 Filing Deadline for a Plan Joining a PEP

The final Form 5500 for a single employer plan that merges into a PEP is due:

• Last day of the 7th month following the date legal control of plan assets transfers to the PEP
• Subject to applicable extensions (e.g., Form 5558)

The short plan year does not eliminate the requirement to:

• File a complete Form 5500
• Include an auditor’s report, if the plan is subject to ERISA audit requirements
  

Frequently Asked Questions About Short-Year Form 5500 Filing Requirements When A Plan Joins A Pooled Employer Plan (PEP) 

Does a single employer plan still need to file a final Form 5500 after joining a PEP?
Yes. When a plan merges into a PEP, it must file a final short-year Form 5500 covering the period up to the transfer date because the original plan ceases to exist as a separate reporting entity.

Can a plan defer the audit requirement for a short plan year when joining a PEP?
No. ERISA short-year audit deferral relief does not apply because there is no subsequent Form 5500 filing for the same plan after it merges into the PEP.

What must be included with the final short-year Form 5500 if the plan is subject to audit requirements?
The filing must include audited financial statements and the independent qualified public accountant (IQPA) report, even if the short plan year is seven months or fewer.

Can the PEP’s Form 5500 include the pre-merger financial activity of the employer’s prior plan?
No. The PEP may only report financial activity occurring after the employer officially joins the PEP and cannot combine pre-merger activity from a separate ERISA plan.

When is the final short-year Form 5500 due after a plan joins a PEP?
The filing is generally due by the last day of the seventh month following the transfer of legal control to the PEP, with extensions available through Form 5558 if needed.