Skip to content

Introduction

SECTION 2. BACKGROUND

Internal Revenue Bulletin 2008-48 · 2026-10-03 edition · updated 2026-10-04 · United States

INFORMATION

.01 Statute —Section 431(d) was added to the Code as part of a significant revision of the funding rules for qualified pension plans under § 401(a) made by the Pension Protection Act of 2006 (PPA). Parallel provisions to § 431(d) can be found at section 304(d) of the Employee Retirement Income Security Act of 1974 (ERISA). The Secretary of the Treasury has interpretive and enforcement jurisdiction over both provisions.

Section 431(d)(1) provides that if the plan sponsor of a multiemployer plan submits to the Secretary of the Treasury an application for an extension of the amortization period for any unfunded liability, and includes the certification by the plan’s actuary described in § 431(d)(1)(B), the Secretary shall extend the amortization period for the period (not in excess of 5 years) requested in the application. An extension under § 431(d)(1) is referred to as an automatic extension. In addition, § 431(d)(2)(A) provides that the plan sponsor of a multiemployer plan may submit an application for an extension of the amortization period for an unfunded liability, and the Secretary may extend the amortization period for a period of time not in excess of 10 years less the number of years of any automatic extension with respect to such unfunded liability, if the Secretary makes the determination described in § 431(d)(2)(B). An extension under § 431(d)(2) is referred to as an alternative extension. Section 431(d)(3) requires that an applicant provide notice of the extension request to each affected

party described in section 4001(a)(21) of ERISA.

Before amendment by PPA, § 412(e) of the Code and § 304(a) of ERISA provided that the period of years required to amortize any unfunded liability of any plan may, upon application by the plan sponsor, be extended for a period up to 10 years. Those provisions were replaced with new § 431(d) of the Code and new section 304(d) of ERISA, effective for plan years starting after December 31, 2007.

Effective for plan years starting after December 31, 2007, there is no provision in the Code for single employer plans to receive an extension of the amortization period for any unfunded liability.

Get a plain-English answer with a citation back to this text.

Ask AI about this code
▸Contents — Internal Revenue Bulletin 2008-48

GoCodebook provides public access, search, citation, multilingual explanation, and practical interpretation of legally adopted building regulations. It is not a substitute for the official ICC or California code publications.