Brief Case
Pension Resource

29 C.F.R. § 4043.23

Active participant reduction.
CFR 2015 annual edition (revised as of 2015-07-01) · superseded Jul 1, 2016
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(a) Reportable event. A reportable event occurs when the number of active participants under a plan is reduced to less than 80 percent of the number of active participants at the beginning of the plan year, or to less than 75 percent of the number of active participants at the beginning of the previous plan year.
(b) Initial information required. In addition to the information in § 4043.3(b), the notice shall include—
(1) A statement explaining the cause of the reduction (e.g., facility shutdown or sale); and
(2) The number of active participants at the date the reportable event occurs, at the beginning of the plan year, and at the beginning of the prior plan year.
(c) Waivers
(1) Small plan. Notice is waived if the plan has fewer than 100 participants at the beginning of either the current or the previous plan year.
(2) Plan funding. Notice is waived if—
(i) No variable rate premium. No variable rate premium is required to be paid for the plan for the event year;
(ii) $1 million unfunded vested benefits. As of the testing date for the event year, the plan has less than $1 million in unfunded vested benefits; or
(iii) No unfunded vested benefits. As of the testing date for the event year, the plan would have no unfunded vested benefits if unfunded vested benefits were determined in accordance with the assumptions and methodology in § 4010.4(b)(2) of this chapter.
(3) No facility closing event/80-percent funded. Notice is waived if—
(i) The active participant reduction would not be reportable if only those active participant reductions resulting from cessation of operations at one or more facilities were taken into account; and
(ii) As of the testing date for the event year, the fair market value of the plan's assets is at least 80 percent of the plan's vested benefits amount.
(d) Extensions. The notice date is extended to the latest of—
(1) Form 1 extension. 30 days after the plan's variable rate premium filing due date for the event year if a waiver under any of paragraphs (c)(2)(i) through (c)(2)(iii) or (c)(3) of this section would apply if “the plan year preceding the event year” were substituted for “the event year”;
(2) Form 5500 extension. 30 days after the plan's Form 5500 due date that next follows the date the reportable event occurs, provided the event would not be reportable counting only those participant reductions resulting from cessation of operations at a single facility; and
(3) Form 1-ES extension. The due date for the Form 1-ES for the plan year following the event year if—
(i) The plan is required to file a Form 1-ES for the plan year following the event year;
(ii) The event would not be reportable counting only those participant reductions resulting from cessation of operations at a single facility; and
(iii) The participant reduction represents no more than 20 percent of the total active participants (at the beginning of the plan year(s) in which the reduction occurs) in all plans maintained by any member of the plan's controlled group.
(e) Determination of the number of active participants
(1) Determination date. The number of active participants at the beginning of a plan year may be determined by using the number of active participants at the end of the previous plan year.
(2) Active participant. “Active participant” means a participant who—
(i) Is receiving compensation for work performed;
(ii) Is on paid or unpaid leave granted for a reason other than a layoff;
(iii) Is laid off from work for a period of time that has lasted less than 30 days; or
(iv) Is absent from work due to a recurring reduction in employment that occurs at least annually.
29 C.F.R. § 4043.23 — Active participant reduction. · CFR 2015 annual edition (revised as of 2015-07-01) · https://pensionresource.website/EAMain?content=EAMain.Law&id=cfr29-4043.23&asof=2007-01-03 · printed Oct 16, 2026
On this page
  • (a) Reportable event.
  • (b) Initial information required.
  • (c) Waivers
  • (d) Extensions.
  • (e) Determination of the number of active participants
Implements
ERISA § 4043 (29 U.S.C. § 1343) Reportable events
Guidance addressing this section
PBGC
Opinion Letters
Final Rules
Proposed Rules
  • 84 FR 30666Proposed Jun 27, 2019 — Miscellaneous Corrections, Clarifications, and Improvements Comments due Aug 26, 2019 (a)(1)(a)(2)
Also cited in 4 other documents
PBGC
Proposed Rules
  • 91 FR 45739Proposed Jul 21, 2026 — Penalties for Failure To Provide Certain Notices or Other Material Information Comments due Sep 21, 2026
  • 78 FR 20039Proposed Apr 3, 2013 — Reportable Events and Certain Other Notification Requirements Comments due Jun 3, 2013
  • 75 FR 48283Proposed Aug 10, 2010 — Liability for Termination of Single-Employer Plans; Treatment of Substantial Cessation of Operations Comments due Oct 12, 2010
Final Rules
  • 80 FR 54980 Sep 11, 2015 — Reportable Events and Certain Other Notification Requirements

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Each row is a version of the text as published by the official source. Code dates are the edition/release point that first reflected the change; regulation dates are eCFR effective dates. The library checks the official sources automatically, so new versions appear here on their own; “run” opens the sync that recorded a version.

EffectiveThroughSourceAmended by
Jul 1, 1997Jun 30, 2006CFR 2005 annual edition (revised as of 2005-07-01) run 127View
Jul 1, 2006Jun 30, 2016CFR 2015 annual edition (revised as of 2015-07-01) run 127View · Redline (sign in)
Jul 1, 2016Dec 31, 2016CFR 2016 annual edition (revised as of 2016-07-01) run 127View · Redline (sign in)
Jan 1, 2017Feb 3, 2020eCFR amendment effective 2017-01-01 run 26View · Redline (sign in)
Feb 4, 2020Mar 4, 2020eCFR amendment effective 2020-02-04 run 26View · Redline (sign in)
Mar 5, 2020Jun 23, 2020eCFR amendment effective 2020-03-05 run 2685 FR 6061, Feb. 4, 2020View · Redline (sign in)
Jun 24, 2020currenteCFR editorial change effective 2020-06-24 run 285 FR 6061, Feb. 4, 2020View · Redline (sign in)
Provision-level history (blame)