Few obligations in the multiemployer pension universe arrive as late in a transaction as the purchaser’s bond under section 4204 of ERISA. The asset purchase agreement is circulating in redline, the closing calendar is fixed, and then diligence surfaces a collective bargaining agreement and, behind it, an obligation to contribute to a multiemployer plan. At that moment the transaction ceases to be an ordinary sale of assets. It becomes, by operation of statute, a complete withdrawal, and the seller’s allocable share of the plan’s unfunded vested benefits crystallizes into an assessable liability payable on a schedule the plan sponsor determines.
Section 4204 of ERISA is the answer Congress supplied. A bona fide sale of assets at arm’s length to an unrelated party does not itself produce a withdrawal where three conditions are satisfied: the purchaser assumes an obligation to contribute to the plan for substantially the same number of contribution base units; the purchaser provides the plan a bond or escrow for five plan years in a statutorily prescribed amount; and the contract for sale imposes secondary liability on the seller should the purchaser withdraw during that period and fail to pay. The safe harbor is conditional, and the conditions are conjunctive. A transaction that closes without conforming covenants has not made a section 4204 election. It has effected a complete withdrawal with additional paperwork.
Counsel confronting that discovery needs two numbers, and needs them before the next drafting call rather than after the next underwriting cycle. The first is the penal sum of the Section 4204 bond the statute demands. The second is whether the instrument is owed at all. ERISA4204Bonds.com was built to produce both, and the tools now published there are the subject of this essay.
The First Number: The Statutory Penal Sum
The penal sum of a section 4204 bond is not a negotiated figure, and it is not a function of the purchase price. It is the greater of two measurements: the average annual contribution the seller was required to make with respect to the covered operations for the three plan years preceding the plan year in which the sale occurs, or the annual contribution the seller was required to make with respect to those operations for the last plan year before the plan year of the sale. The instrument runs for five plan years commencing with the first plan year beginning after the sale, and it is payable to the plan if the purchaser withdraws or fails to make a contribution when due at any time during that period. The surety must be one acceptable for purposes of ERISA section 412, the same qualification standard that governs plan fidelity bonding.
Three features of that formula defeat casual estimation. Measurement runs in plan years rather than in the purchaser’s fiscal years, so a seller with a June plan year and a December fiscal year will produce two different answers depending on which calendar is used, and only one of them is the statutory one. Multiplan transactions stack rather than blend: a seller contributing to four funds generates four separate calculations and four separate instruments. And the base formula is not the ceiling. Where the plan is in reorganization in the plan year in which the sale occurs, the statute doubles the requirement to two hundred percent of the computed amount.6 A separate provision reaches the sell side entirely, requiring the seller to post its own bond or escrow, measured by the present value of the withdrawal liability it would have had if it liquidates or distributes all of its assets substantially before the five-plan-year period closes.
The penal sum calculator on the homepage of ERISA4204Bonds.com runs the greater-of test directly from the seller’s contribution history, taking the most recent plan year and the two preceding it and returning the indicated statutory amount. It is deliberately narrow. It answers the question the statute asks and flags, rather than silently resolves, the multiplan stack and the reorganization multiplier, both of which are verified plan by plan against the fund’s own documents before any section 4204 bond quotation issues.
The Second Number: Whether the Section 4204 Bond Is Owed at All
The more consequential question is the one most transaction memoranda never reach. The Pension Benefit Guaranty Corporation has exercised its authority to vary the section 4204 bond and sale contract requirements, and Subpart B of 29 CFR Part 4204 excuses both where the parties inform the plan in writing of their intention that the sale be covered by section 4204 and demonstrate, to the satisfaction of the plan, that at least one of three criteria is met.
The first is the de minimis test: the required bond or escrow does not exceed the lesser of $250,000 or two percent of the average total annual contributions made by all employers to the plan for the three most recent plan years ending before the date of determination. The second is the net income test: the purchaser’s average net income after taxes for its three most recent fiscal years ending before the date of determination, reduced by any interest expense incurred with respect to the sale and payable in the following fiscal year, equals or exceeds one hundred fifty percent of the bond amount. The third is the net tangible assets test: the purchaser’s net tangible assets at the end of the fiscal year preceding the date of determination equal or exceed the unfunded vested benefits allocable to the seller under section 4211 with respect to the purchased operations, or, where the purchaser already contributed to the plan, the sum of the amounts allocable to purchaser and seller alike.
Three qualifications govern the arithmetic and are routinely missed. Where the transaction involves more than one plan, the tests are applied on an aggregated basis across every plan for which no bond or escrow has been posted, which means a purchaser comfortably clearing the threshold against one fund may fail against four. A purchaser that is the subject of a bankruptcy petition or an analogous state insolvency proceeding as of the earlier of the plan’s decision or the first day of the first plan year beginning after the date of determination cannot qualify under either financial test at all. And the inputs are defined terms rather than balance sheet captions: net tangible assets excludes licenses, patents, trade names, goodwill and the remaining catalogue of intangibles, subtracts liabilities other than pension liabilities, and counts encumbered assets only to the extent they exceed the encumbrance.
The variance worksheet published alongside the calculator runs all three tests, drawing the penal sum from the calculator above it or accepting a manual figure, and returns a plain statement of whether any criterion appears satisfied. Where one does, the practitioner has the beginning of a demonstration to the fund. Where none does, the practitioner has the beginning of a section 4204 bond placement.
Why the Worksheet Says “Indicative Only”
The disclaimer on the worksheet is not defensive boilerplate. It reflects three structural features of the regulation that no calculator can resolve.
The demonstration runs to the plan, not to the agency. Subpart B conditions relief on satisfying the plan sponsor, and a fund’s actuarial and legal advisors are entitled to examine the audited statements that Part 4204 requires the request to include. The arithmetic is a predicate to that conversation, never a substitute for it.
Timing is measured from the date of determination, which the regulation defines as the date the seller ceases covered operations or ceases to have the obligation to contribute as a result of the sale, and not from the date counsel happens to run the numbers. An analysis performed against stale statements, or against the purchaser’s pre-closing balance sheet rather than its pro forma post-closing position, is the single most common way a variance that looked comfortable in diligence evaporates at signing.
Relief also remains available where the tests fail. Part 4204 preserves a limited shelter during the pendency of a variance request, barring the plan from requiring the bond while the request is under consideration provided the required information was submitted before the first day of the first plan year beginning after the sale, and it permits cancellation of a bond or refund of an escrow already in place if the purchaser later satisfies either financial test. Where no criterion holds but the equities are strong, Subpart C provides for individual and class variances from the Corporation itself. Those are argued, not computed.
The Library, the Guide, and the Submission
Two numbers are a beginning. The practitioner library at ERISA4204Bonds.com carries the analysis to treatise depth across eight essays: the withdrawal liability regime and the Supreme Court authorities that shaped it, the three safe harbor covenants and the drafting failures that void elections, the Part 4204 variance tests in full arithmetic, penal sum mechanics for growing and declining contributors, the capital economics of bond against escrow, the seller’s five-year tail and its release, fund-prescribed bond forms and where negotiation actually lives, and the underwriting file itself. A Practitioner’s Guide to ERISA § 4204 Sale of Assets Bonds, 2026 edition, authored by C. Constantin Poindexter, a thirty-year veteran of the surety industry, collects the same material in nine sections and is published without charge.
The five-step submission closes the loop. Worksheet figures transmit with the file, so the desk receives a reasoned variance position rather than a request to start from nothing, and complete files are acknowledged the same business day. Where the criteria hold on verification against post-closing figures, the written response is that no bond is required, and the engagement ends there at no cost.
That policy invites an obvious question, and the honest answer is worth stating plainly. A desk that publishes the test excusing its own product loses the files where the test is satisfied and earns the ones where it is not, which is a favorable trade when the alternative is a market in which counsel cannot get the analysis at all. Surety One, Inc. has issued more than 25,440 ERISA bonds since 2012 against a zero loss ratio, is qualified under section 412, and is licensed in all fifty states, Puerto Rico and the United States Virgin Islands. Practitioners whose transactions also implicate plan fidelity bonding will find that instrument at ERISA-Bonds.com, and those who discover, as many do at precisely this moment in a deal, that the plan’s fiduciaries carry no personal protection will find the answer at FiduciaryLiabilityCoverage.com.
A section 4204 bond is a small instrument attached to a large liability, and the parties who need it most are usually the ones with the least time to study it. The tools at ERISA4204Bonds.com exist so that the statutory number and the exemption question can be answered on the drafting call rather than after it. Follow the ERISA Blog or any of the hyperlinked URLs for up-to-date changes in “all things ERISA”.
~ C. Constantin Poindexter, MA, JD, CPCU, AFSB, ASLI, ARe, AINS, AIS, CPLP
Bibliography
- Employee Retirement Income Security Act of 1974, Pub. L. No. 93-406, 88 Stat. 829, as amended.
- Multiemployer Pension Plan Amendments Act of 1980, Pub. L. No. 96-364, 94 Stat. 1208.
- ERISA § 412, 29 U.S.C. § 1112 (fidelity bonding; acceptable surety standard).
- ERISA § 4201, 29 U.S.C. § 1381 (withdrawal liability generally).
- ERISA § 4203, 29 U.S.C. § 1383 (complete withdrawal).
- ERISA § 4204, 29 U.S.C. § 1384 (sale of assets).
- ERISA § 4211, 29 U.S.C. § 1391 (methods of allocating unfunded vested benefits).
- ERISA § 4213(c), 29 U.S.C. § 1393(c) (unfunded vested benefits defined).
- 29 C.F.R. pt. 4204 (Pension Benefit Guaranty Corporation, Variances for Sale of Assets), subpts. A to C.
- 29 C.F.R. § 4204.2 (definitions).
- 29 C.F.R. § 4204.11 (variance of the bond, escrow and sale contract requirements).
- 29 C.F.R. § 4204.12 (de minimis transactions).
- 29 C.F.R. § 4204.13 (net income and net tangible assets tests).
- 29 C.F.R. §§ 4204.21 to 4204.22 (requests to the Corporation for individual and class variances).
- 61 Fed. Reg. 34,084 (July 1, 1996); 86 Fed. Reg. 1,270 (Jan. 8, 2021); 90 Fed. Reg. 39,328 (Aug. 15, 2025).
- Pension Benefit Guaranty Corp. v. R.A. Gray & Co., 467 U.S. 717 (1984).
- Concrete Pipe & Products of California, Inc. v. Construction Laborers Pension Trust for Southern California, 508 U.S. 602 (1993).
- Milwaukee Brewery Workers’ Pension Plan v. Joseph Schlitz Brewing Co., 513 U.S. 414 (1995).
- Bay Area Laundry & Dry Cleaning Pension Trust Fund v. Ferbar Corp. of California, 522 U.S. 192 (1997).
Practice Materials
- C. Constantin Poindexter, A Practitioner’s Guide to ERISA § 4204 Sale of Assets Bonds, 2026 ed. (Surety One, Inc., 2026), https://erisa4204bonds.com/guides/erisa-4204-guide.pdf.
- ERISA4204Bonds.com, “The 29 CFR Part 4204 Variance Tests,” https://erisa4204bonds.com/part-4204-variance-analysis.html.
- ERISA4204Bonds.com, “Calculating the § 4204 Penal Sum,” https://erisa4204bonds.com/section-4204-penal-sum.html.
- ERISA4204Bonds.com, “Bond vs. Escrow Under § 4204,” https://erisa4204bonds.com/bond-vs-escrow-4204.html.
- Pension Benefit Guaranty Corporation, Multiemployer Plan Resources for Employers and Practitioners, https://www.pbgc.gov/employers-practitioners/multiemployer.
