Competitive PRT Cost Falls Below ABO: Decision Framework for DB Plan Sponsors in 2026

Single-employer defined benefit plan sponsors can now buy out pension liabilities at below their GAAP balance sheet value. Milliman’s Pension Buyout Index for May 31, 2026 puts competitive annuity pricing at 99.7% of accumulated benefit obligation, the first sub-100% print in three years, while the Milliman 100 funded ratio hit 109.6%, its highest level since July 2001 (Milliman Pension Funding Index, June 2026). That combination changes the actuarial framing for plan termination.

The ABO Threshold: Why Sub-100% Changes the P&L Calculus

The accumulated benefit obligation is the present value of all pension benefits the plan has already accrued, discounted at current high-quality corporate bond yields, with no allowance for future salary growth. For frozen or terminated plans, the ABO and PBO converge because neither calculation assumes future compensation increases. For plans with active participants still accruing benefits, the PBO exceeds the ABO by the present value of projected future salary-driven benefit growth. When competitive PRT pricing sits at 99.7% of ABO, it is below the minimum GAAP accounting liability for all plan categories: frozen, terminated, and active alike.

The accounting consequence flows from ASC 715 (the SFAS 87 successor governing pension settlement accounting). When a plan settles a pension obligation at a price below its carrying accounting value, the difference is recognized immediately as a settlement gain on the income statement, provided the settlement amount exceeds the applicable corridor under the standard. For most frozen or retiree-only populations, the relevant accounting floor is the ABO, not the PBO. A transaction priced at 99.7% of ABO clears that floor and records a gain.

The magnitude is not trivial. For a $300 million frozen plan with an ABO of $280 million, a buyout at 99.7% of ABO costs $279.2 million against a $280 million accounting liability, producing a $0.8 million settlement gain before any recognition of the funded surplus above the ABO. Add the excess assets held above that liability, and the transaction economics for CFOs look categorically different from any PRT completed when pricing ran 101% to 103% of ABO over the prior three years. Those transactions required sponsors to absorb a settlement loss. This one does not.

May 2026 Funded Status: What Drove the $116 Billion Surplus

The Milliman 100 corporate DB plans ended May 31, 2026 with $1.324 trillion in assets, $1.208 trillion in projected benefit obligation, and a $116 billion aggregate surplus (Milliman Pension Funding Index, June 2026). The funded ratio of 109.6% is the highest reading since the 109.9% mark at the end of July 2001. The improvement came primarily from asset performance: plans returned 2.22% in May alone, adding $22 billion to asset values. Liabilities declined modestly as the FTSE Above Median AA discount rate edged down 4 basis points to 5.62%. Funded status improved by $18 billion in the single month of May.

The 12-month picture is equally striking. From June 2025 to May 2026, the Milliman 100 funded ratio climbed 5.4 percentage points (from 104.2% to 109.6%), funded status improved by $65 billion, and plan assets generated a 13.15% cumulative return (Milliman Pension Funding Index, June 2026). Discount rates moved only 9 basis points lower over that window, so the improvement was almost entirely asset-side. A plan that was modestly funded a year ago now holds roughly 10 cents of surplus per dollar of projected liability. That surplus is the financial fuel for a PRT transaction; it is also the cushion that absorbs the one-time costs of plan termination (actuarial fees, legal fees, PBGC filing, and participant notice administration) without touching ongoing plan assets.

Five Paths at 109.6%: Mapping Options Against the Current Pricing Window

The combination of 99.7% ABO pricing and a 109.6% funded ratio maps differently onto each of the five standard de-risking paths. The actuarial value in advising sponsors at this inflection is not running a spreadsheet; it is diagnosing which path the plan’s specific characteristics actually support and what the critical path looks like for each.

Full plan termination buyout. This is the only path that simultaneously locks in the settlement gain, eliminates both the PBGC flat-rate and variable-rate premium permanently, transfers longevity and interest rate risk to the insurer, and releases excess assets to the plan sponsor. The IRC Section 4980 excise tax (50% on reversion to employer) or the SECURE 2.0 transfer-to-qualified-replacement-plan provision governs how surplus exits the plan tax-efficiently. The administrative path is real and not short: IRS determination letters for terminating plans routinely take six to twelve months, and ERISA Section 204(g) participant notices and benefit calculation audits must be completed before distributions begin. At a 109.6% funded ratio with pricing at 99.7% of ABO, the economics justify beginning that administrative path now.

Retiree-only lift-out. A partial buyout covering only the retiree population reduces total plan liability and demographic complexity without requiring plan termination. The settlement gain is recognized under ASC 715 only if the dollar amount transferred exceeds the settlement corridor. Because retirees are the standard pricing population for group annuity insurers, the 99.7% ABO competitive pricing applies most directly here. Deferred vested participants and active employees remain in the plan, preserving optionality but also preserving administrative overhead and PBGC premiums on the residual population.

Lump sum window. Offering terminated vested participants a one-time lump sum using current IRS 417(e) minimum lump sum rates transfers interest rate risk to departing participants but does not produce an accounting gain relative to ABO in most rate environments. Lump sums are faster to execute than an insurer buyout (no group annuity contract required) and reduce headcount and plan complexity, but the economics are less compelling than the current group annuity pricing environment for sponsors evaluating aggregate de-risking impact.

Buy-in. A pension buy-in purchases a group annuity contract that exactly matches plan benefit payments to covered retirees, but the insurer contract is held as a plan asset rather than constituting a settlement. The pension liability remains on the balance sheet. A buy-in does not generate a settlement gain under ASC 715, but it effectively defeases the covered liability, removing longevity and reinvestment risk without the administrative burden of plan termination. Buy-in volume surged 372% year-over-year in 2025 as sponsors navigated economic volatility and litigation risk while still moving to reduce exposure (LIMRA, 2026). A buy-in can serve as the first stage of a multi-step termination, with the same insurer converting the contract to a buyout in a subsequent transaction.

Hold. Maintaining the 109.6% funded ratio and investing the surplus in excess return strategies is defensible if the sponsor has the governance appetite, the PBGC premium capacity, and confidence that the rate environment will hold long enough for the window to remain open. The risk is quantified in the rate sensitivity analysis below.

Competitive Bidding at 2.8%: What the Spread Tells You Now

Milliman Pension Buyout Index co-author Jake Pringle said of the May data: “The competitive MPBI fell below 100%, while both indices reached three-year lows -- all of which is great news for plan sponsors” (Milliman, June 23, 2026). The competitive price in the May index is 99.7% of ABO; the average across all nine insurers tracked in the index is 102.5%. The 2.8-percentage-point spread between those two numbers is the quantified value of running a structured, multi-insurer competitive process versus a bilateral or single-carrier negotiation.

That 2.8% spread is narrower than the 3.3% spread in the April 2026 reading, when competitive pricing stood at 100.1% of ABO and the average was 103.4%. The compression as the index crossed below par is expected: when underlying liability-matching economics improve uniformly across insurers, the competitive pricing cluster tightens, because all participating carriers are working from similar hedging costs on the same yield curve. For plan actuaries advising on process structure, the narrowing spread signals that the absolute level of competitive pricing now matters more than the relative benefit of competition itself. Both figures are favorable. The priority for most sponsors is whether their funded ratio and administrative readiness support capturing the absolute price before the rate environment shifts.

For a $400 million frozen plan, the 2.8% competitive premium over an average single-carrier result is $11.2 million. The actuarial investment in a well-structured competitive process, including data remediation, benefit form analysis, and insurer prequalification, rarely approaches $1 million on a mid-size transaction. The cost-benefit is not close.

Rate Sensitivity: The Case Against Waiting on the Fed

The FTSE Above Median AA discount rate as of May 31, 2026 is 5.62%, down 4 basis points from April and 9 basis points over the trailing 12 months (Milliman Pension Funding Index, June 2026). If the Federal Reserve delivers rate cuts in the second half of 2026, the effect on pension accounting and PRT pricing operates through different transmission channels on different timelines.

For a frozen plan with average liability duration of 12 to 14 years, a 50-basis-point decline in the AA discount rate increases the ABO by approximately 6% to 7%. That is a larger ABO denominator, which mechanically pushes the PRT-cost-to-ABO ratio down. That initial effect sounds favorable. But insurer annuity pricing moves in the same direction: lower available asset yields mean insurers must charge more to deliver the same guaranteed payout stream. In short-duration rate cuts driven by Fed policy on the short end, the long AA corporate curve and insurer new-money rates do not fall in lockstep. Insurer pricing tends to reprice faster on new-money yields than the long AA curve moves, particularly in the first three to six months after a cut. The net effect in that window: insurer annuity costs rise relative to the ABO, pushing the MPBI ratio back toward or above 100%.

The timing asymmetry is the critical actuarial point. A sponsor in the final stages of a transaction, with a committed insurer price and a signed group annuity contract, captures the May 2026 window regardless of subsequent rate moves. A sponsor beginning the administrative prerequisites today faces 12 to 18 months of execution lead time. A 50-basis-point rate cut in Q3 or Q4 2026 could close the below-ABO pricing window before the transaction closes, even if the ABO itself grows. Sponsors who understand this asymmetry begin the administrative workstream now; those who wait for a further pricing improvement risk losing the window to the rate cycle.

Volume Lag and the 2025 Data: Why History Points to a 2026-to-2027 Surge

US single-premium pension risk transfer buyout volume fell 35% in 2025 to $31.3 billion, from $51.8 billion in 2024 (LIMRA, 2026). The 2025 trajectory was sharply uneven. Second quarter volume collapsed to $4.1 billion (down 64% from Q1) as litigation risk around investment manager selection in PRT transactions surfaced in high-profile state fiduciary actions and economic volatility from tariff uncertainty elevated CFO caution. Fourth quarter volume recovered to $28 billion, a 132% sequential jump, as sponsors who had deferred mid-year activity completed transactions ahead of year-end.

The 2025 pattern confirms a well-documented characteristic of PRT pricing cycles: plan sponsors do not respond instantaneously to pricing inflections. The administrative prerequisites for a full plan termination -- IRS determination letter, benefit calculations audited to participant level, PBGC reporting, and participant notices -- require 12 to 18 months of sustained effort even after the board’s decision to transact has been made. At prior inflection points (late 2012 and the 2018 rate spike), buyout volume accelerated sharply in the 12 to 18 months following the first sustained below-par pricing readings, as boards gained confidence that the favorable window would persist and administrative workstreams reached completion.

The May 2026 reading at 99.7% of ABO is the first sustained below-par print since 2023. Tracking the Milliman Pension Buyout Index monthly across the rate cycle since 2023, the pairing of a three-year pricing low with a funded ratio not seen since July 2001 is historically unusual; prior pairings of this quality have preceded the volume surges that followed in 2013 and 2019. If the historical 12-to-18-month lag applies, the acceleration would land in mid-2027, assuming rates hold. Plan actuaries who surface this historical pattern to plan sponsors now, before the administrative preparation begins, are delivering the timing advice that has the most impact on whether sponsors capture the window or miss it.

Year	US Single-Premium PRT Volume	Source
2024	$51.8B (buyouts $48.1B, buy-ins $3.7B; 794 contracts)	LIMRA, 2025
2025	$31.3B buyouts (down 35%); buy-ins surged 372% YoY	LIMRA, 2026
2025 Q2	$4.1B (down 64% from Q1; litigation and tariff uncertainty)	LIMRA, 2025
2025 Q4	$28.0B (up 132% from Q3; year-end acceleration)	LIMRA, 2026

PBGC Premium Arithmetic: The Recurring Cost of Each Year of Deferral

The 2026 flat-rate PBGC premium for single-employer plans is $111 per participant, up from $106 in 2025, $86 in 2021, and $35 as recently as 2012 (PBGC, 2026). For a plan with 2,000 participants, the flat-rate assessment is $222,000 per plan year, paid regardless of funded status. The variable-rate premium adds $52 per $1,000 of unfunded vested benefits (PBGC, 2026); a plan carrying even modest unfunded vested benefit exposure from plan amendment timing or actuarial assumption changes pays that variable component on top of the flat-rate assessment.

A full plan termination buyout eliminates both premiums entirely, in perpetuity. For the same 2,000-participant plan at $111 per participant, the flat-rate premium stream alone represents $1.1 million in cumulative cost over five years at current rates, before any future increases. The flat-rate premium has tripled since 2012 with no statutory ceiling constraining the trend. That trajectory provides no basis for projecting a reversal.

For the plan actuary presenting termination economics to a plan sponsor, the PBGC premium stream is the simplest quantification of the cost of deferral that requires no market assumption to calculate. It compounds annually, at a rate the sponsor does not control, on a headcount that declines slowly as participants die or begin benefits. Sponsors who defer in 2026 and 2027 will pay $222 per 2,000-participant plan in the flat-rate premium over the two-year period at current rates, before any future increases Congress or PBGC may enact. That number is not a projection; it is a current-law certainty.

The plan actuary who can put the settlement gain from a 99.7% ABO transaction, the one-time administrative cost, the PBGC premium stream avoided, and the rate sensitivity of the window into a single coherent economic summary is giving the sponsor committee exactly what it needs to make a timing decision with appropriate confidence. The pricing window is open. The funded status supports it. The administrative clock starts now.