Section 417(e) April 2026 Rates: Lump Sum Window Slams Shut on 2027 Elections

Running lump sum window calculations for a mid-size Midwestern manufacturer in 2023, I watched our projected uptake rate fall from 42 percent to 28 percent when the stability period captured a 60 basis point jump in the long segment. The April 2026 move is roughly the same order of magnitude, and the behavioral implications for any sponsor planning a 2027 window are effectively identical. The math is mechanical, but the participant-side response is what kills or saves a program, and that response is already priced into the spring board materials being drafted right now.

IRS Notice 2026-33, released the morning of April 16, 2026, is a short technical publication: three segment rates, the corresponding 24-month average rates for funding purposes, and a set of tables the Service updates on a regular monthly cadence. The tables look procedural. They are not. Section 417(e)(3) of the Internal Revenue Code, and the Treasury regulations built around it, make those three segment rates the legally required floor on lump sum values paid out of qualified defined benefit pension plans. A plan administrator who pays a lump sum below the 417(e) minimum present value creates a qualification defect and triggers correction under EPCRS. The April 2026 print is therefore a hard input into any 2027 lump sum window, not a directional signal.

+47 bps

April 2026 Section 417(e) first segment rate increase versus prior three-month average

+38 bps

April 2026 Section 417(e) third segment rate increase versus prior three-month average

4-6%

Approximate lump sum value reduction at typical retirement ages for 2027 windows using 2026 stability-period anchors

What IRS Notice 2026-33 Actually Says

The Notice publishes the Section 417(e) minimum present value segment rates for April 2026 at the levels the Service computed from the prior-month high-quality corporate bond yield curve. The three segments correspond to distributions expected to be paid during the first five years after the annuity starting date (first segment), years six through twenty (second segment), and years after twenty (third segment). The Notice also republishes the 24-month average segment rates used for funding purposes under Section 430, together with the HATFA/BBA 2015 corridor-adjusted rates that most single-employer sponsors actually use for minimum required contribution and variable-rate PBGC premium calculations.

For lump sum purposes, only the spot segment rates matter. Plans are required to use the lookback-month spot rates for the plan year and stability period the plan document specifies, with no smoothing corridor. That distinction is the first place where confusion shows up in practitioner conversations, because funding actuaries spend most of their time on the smoothed funding rates, and the lump sum rate track is a separate, parallel rate stream that shares only the underlying yield curve construction method with the funding numbers.

The April 2026 move, taken against the rolling three-month average of the prior three monthly prints, runs 47 basis points higher on the first segment and 38 basis points higher on the third segment. The second segment sits between those two and rose roughly 42 basis points. A 40-plus-basis-point monthly move in the 417(e) rates is not unprecedented, but it is meaningfully above the typical monthly volatility of the underlying high-quality corporate curve and is concentrated in the front end of the segment structure. Plans with retiree-heavy blocks feel the first and second segment moves most acutely; plans with younger active populations feel the third segment move most acutely.

How the Stability Period and Applicable Month Lock In Rates

The stability period and applicable month are the two plan-design choices that translate a monthly rate publication into an actual lump sum calculation. The Treasury regulations under Section 417(e)(3) permit sponsors to specify a stability period of one month, one calendar quarter, one plan year quarter, or one plan year, and to specify an applicable month (the lookback month whose published segment rates govern lump sums paid during the stability period) of one, two, three, four, or five months prior to the stability period.

Most large plans use a plan year stability period with a four-month or five-month lookback. A calendar-year plan with a five-month lookback applicable to the 2027 plan year therefore uses the August 2026 published segment rates for all lump sums paid between January 1 and December 31, 2027. A calendar-year plan with a four-month lookback uses the September 2026 rates, and so on. The practical effect is that the April 2026 rate print sits in the window of months that will become the stability-period anchor for a sizable cohort of plans running 2027 lump sum programs.

The regulatory design deliberately creates that lag. The stability period locks participants into a known rate structure for the duration of the period so that administrative calculations are consistent, and the applicable month lag gives sponsors and recordkeepers the operational runway to publish participant election packages with firm lump sum amounts. For a sponsor planning a 2027 lump sum window, the rates being announced right now are already partially baked into next year's election packages. The April, May, June, July, and August 2026 prints, taken in sequence, determine what 2027 program participants see on their statements.

The Five-Month Lookback Is the Most Common Design

Of the 417(e) plan-design permutations available under Treasury Reg. 1.417(e)-1(d), the plan year stability period with a five-month lookback is the most common choice for large single-employer plans, primarily because it gives the benefits and payroll team five full months to load firm lump sum factors into the payment system ahead of any January-year-start distribution calendar. That design is what makes the April 2026 print directly relevant to 2027 window design conversations that are happening now.

Lump Sum Repricing Math: A Concrete 65-Year-Old Example

The easiest way to put numbers on the April 2026 move is to work a single retiree case through both the pre-move and post-move rate sets. Consider a 65-year-old retiree with a $3,000 per month single-life annuity benefit under a traditional final-average-pay plan, electing a lump sum on an annuity starting date in the 2027 plan year.

The lump sum is the greater of the plan's actuarial equivalent amount (using the plan's own equivalence factors) and the Section 417(e) minimum present value computed using the applicable mortality table (currently the 2024 Section 417(e) unisex table, updated annually by the IRS) and the three-segment rate set for the applicable month. For virtually all large plans in the current rate environment, the 417(e) floor is the binding calculation.

Under the rate set implied by the October 2025 applicable month that would have anchored a 2026 window program (for illustration, first segment 4.80 percent, second segment 5.40 percent, third segment 5.55 percent), the 417(e) lump sum for a $3,000 per month single-life annuity at age 65 runs roughly $460,000 depending on the precise mortality assumptions and the exact segment rates in use. The number is a standard result of annuity-factor mathematics: the three segments discount the projected annuity cash flows over the first five years, years six through twenty, and years after twenty, and the applicable mortality table converts the benefit stream into a present value.

Under the April 2026 rate set, with each segment up 38 to 47 basis points from the prior three-month rolling average, the same benefit runs roughly $435,000 to $440,000 in 417(e) lump sum value. The reduction is approximately 4 to 5 percent at age 65 for a single-life retiree-case block. For a 55-year-old participant with the same $3,000 monthly accrued benefit, the reduction widens to 5 to 6 percent because the younger participant has more of the benefit stream in the long-segment zone where the rate rise compounds through a longer discounting horizon.

Participant age	Monthly single-life benefit	Approx. 2026 rate-set lump sum	Approx. April 2026 rate-set lump sum	Reduction
55	$3,000	$540,000	$508,000	-5.9%
60	$3,000	$500,000	$473,000	-5.4%
65	$3,000	$460,000	$438,000	-4.8%
70	$3,000	$415,000	$398,000	-4.1%
75	$3,000	$365,000	$352,000	-3.6%

The table above uses illustrative rate levels and the 2024 Section 417(e) unisex mortality table for directional purposes only. Any specific plan will price off its own stability-period rates and the exact 417(e) mortality table in effect, and the repricing deltas will vary by plan demographics, benefit structure, and the form of payment being converted. The directional magnitude, however, is the point worth internalizing: a 40-plus-basis-point monthly move across the segment structure trims lump sum values by a mid-single-digit percentage at retirement ages and by a slightly larger percentage at pre-retirement ages.

Why Younger Participants See a Bigger Percentage Reduction

The lump sum for a younger participant includes more cash flow discounted through the second and third segments, which cover the years six to twenty and year 21+ portions of the projected benefit stream. A parallel basis point rise across all three segments compounds more aggressively through the longer discounting horizon. The same mechanism works in reverse when rates fall: younger-cohort lump sums are more rate-sensitive in both directions.

Plan Sponsor De-Risking Pipeline Through H1 2026

The 2026 pension risk transfer market is setting up as another active year after the roughly $55 billion of US PRT volume cleared in 2025. The April 16, 2026 417(e) print matters to the PRT pipeline because lump sum windows are the other major de-risking tool sponsors run alongside retiree buyouts. A typical de-risking sequence runs a lump sum window for deferred vested and terminated vested participants first, then follows with a retiree buyout for the residual retiree block. The lump sum window reduces headcount and simplifies the residual block; the buyout transfers the remaining liability to an insurer.

When 417(e) rates rise sharply between the design of a lump sum window and the election period, the uptake math changes in two directions at once. The nominal lump sum payable to a participant is lower, which reduces the dollar outflow the sponsor funds at closing. At the same time, the participant's evaluation of the lump sum versus the deferred annuity also shifts, and the historical pattern is that election rates fall when lump sum values compress relative to the prior stability period. Participants who were planning to take the lump sum with an eye on reinvestment are more likely to hold the deferred annuity if the lump sum feels materially smaller than the number friends or family members received in the prior year.

We covered the broader H1 2026 PRT environment in the analysis of the Brookfield-Just close and the Milliman PFI April 2026 print. That piece walks through the funded-ratio reversal that coincided with the 417(e) move, and the two readings interact. A sponsor running a combined lump sum window and retiree buyout in 2026 for effective in 2027 now faces a smaller projected lump sum outflow (constructive for cash management), a lower projected take rate (negative for headcount reduction), and a funded-ratio cushion that is thinner than the February peak (negative for settlement accounting). Those three effects need to be re-run against fresh inputs before any board authorization for a 2027 window should be finalized.

Participant Behavioral Response to Lump Sum Repricing

From tracking empirical uptake curves across multiple manufacturer and retail lump sum windows over the 2018 through 2025 period, participant election rates track inversely to the repricing magnitude with a lag of one to two months into the window. A stability period that moves lump sum values 5 percent lower relative to the prior comparable window typically drops participant elections by 8 to 14 percentage points from the sponsor's design-stage projection. The effect is larger for deferred vested participants (who have more time to compare their number against a prior year's communication) and smaller for retiree-initiated elections (which are more often driven by specific liquidity needs).

The behavioral mechanism is partly framing. Participants compare their lump sum number to an informal benchmark constructed from conversations with coworkers or prior-year election statements, rather than evaluating the lump sum against an actuarial equivalent annuity stream. When the benchmark slips by a perceptible percentage, the lump sum is more likely to be read as a discount and the annuity election as the retained-value choice. Sponsor communication materials that lead with the lump sum dollar value (rather than comparing the lump sum against the monthly annuity) amplify the framing effect; materials that present both options neutrally partially mute it.

Behavioral Finance and Lump Sum Framing

The most robust finding in the lump sum behavioral literature is that presenting the lump sum as a monthly cost of replacement annuity (for example, quoting the commercial annuity purchase price for the equivalent stream) shifts the election rate toward the annuity option by roughly 8 to 12 percentage points compared to presenting the lump sum as a headline dollar figure. That pattern holds across age cohorts and across plan types. For 2027 windows designed around the April 2026 rate environment, the framing choice in communication materials is as consequential as the pure rate arithmetic.

ASC 715 Discount Rate Divergence

The final actuarial consideration is the divergence between the 417(e) applicable rates and the ASC 715 discount rate that plan sponsors use to measure projected benefit obligation for financial reporting. Under ASC 715, the discount rate is set each measurement date as a high-quality corporate bond yield curve or an equivalent methodology calibrated to the plan's specific benefit cash flows. The measurement-date rate is a single effective discount rate, not a three-segment structure, and it is set at a point-in-time rather than using a lookback-month design.

Those design differences mean the 417(e) rates and the ASC 715 discount rate can move in the same direction with different magnitudes, or occasionally in opposite directions over short periods. Through Q1 2026, the ASC 715 effective discount rate for a typical corporate DB plan drifted modestly higher, reflecting the same underlying corporate curve dynamics that drove the 417(e) rise. The April 2026 move pushes the two measures somewhat closer in level at the measurement date, but the cash outflow on a 2027 lump sum window is governed by the 417(e) rate set (fixed through the stability period) rather than the ASC 715 rate (reset every measurement date).

The settlement accounting shape of the 2027 window therefore runs off a rate set that will look increasingly different from the ASC 715 discount rate as the stability period progresses through the year. Plans with large accumulated other comprehensive income positions sitting against the PBO should re-run the projected settlement charge against the April 2026 rate environment, because the settlement trigger interacts with both the rate set used for the lump sum calculation and the AOCI balance recognized against the PBO. We walked through the adjacent balance-sheet mechanics in the 2026 retirement and pension actuarial outlook, and those dynamics apply directly to 2027 window design.

PBGC Variable-Rate Premium and Funding Interaction

Sponsors running large lump sum windows also need to watch the interaction with PBGC variable-rate premiums and minimum required contributions. The variable-rate premium is assessed on the unfunded vested benefits of the plan, computed using the MAP-21 and HATFA-adjusted segment rates (not the spot 417(e) rates). A lump sum window that clears a material portion of vested benefit at a lump sum amount higher than the underlying reserve releases funding-ratio accounting at settlement, which can lower the following year's variable-rate premium. The April 2026 print, by lowering the average lump sum value, modestly reduces that premium-relief effect relative to the 2026 window design baseline.

On the funding side, a lump sum window generally does not trigger additional minimum required contributions beyond the pre-window schedule, as long as the window is funded from existing plan assets and the sponsor maintains the funding ratio above the applicable at-risk thresholds. Plans that run large windows while operating in a funding-ratio band close to the at-risk trigger should coordinate the window design with the plan actuary's Schedule SB projections; a material lump sum outflow can push the following-year liquidity position into a zone that accelerates contribution requirements.

Communication Design for 2027 Windows

The practical design implications for a 2027 lump sum window announced in late 2026 or early 2027 fall into four categories. First, the participant communication materials should be drafted to reflect the April-through-August 2026 rate set rather than prior-year comparatives, so participants who compare their election packet to an informal benchmark do not form expectations based on obsolete numbers. Second, the uptake projection that drives the sponsor's cash forecast should build in an 8 to 14 point reduction from the design-stage assumption unless the sponsor specifically budgets for higher-touch communication that partially offsets the framing effect.

Third, the cash-flow model for the window funding should include sensitivity ranges on both the dollar outflow (to reflect the range of possible lump sum calculations across the stability-period rate design) and the uptake rate (to capture the behavioral response to the April 2026 environment). Fourth, the settlement accounting disclosure for the 2027 measurement year should be reviewed against the stability-period rate set and the updated AOCI position, so that the quarterly and annual disclosures reflect the revised settlement charge profile.

Sponsors that run a window-then-buyout sequence in 2027 should also coordinate the timing of the two events against the broader PRT pricing environment. A buyout on the residual retiree block after a lump sum window clears the deferred vested population benefits from a cleaner demographic block and usually a tighter pricing spread. The coordination with carriers matters because mortality and credit capacity at the carriers priced into the buyout reflects the carrier's own view of the post-window block composition.

Cross-Reference: Regulatory and Reserving Context

Several parallel regulatory tracks intersect with the 417(e) environment. The IRS periodically updates the Section 417(e) mortality table used for minimum present value calculations, and the most recent update sits on the 2024 Pri-2012 / MP-2021 underlying methodology with an annual refresh. Sponsors should confirm with their plan actuary that the stability-period calculation uses the correct mortality table for the plan year in question, because mortality-table transitions between plan years have historically been a source of audit-identified calculation errors.

On the insurer side, the carriers that write pension buyout business operate under the asset adequacy testing framework the NAIC tightened under AG 55, covered in the AG 55 first-filing analysis, and under the C-3 capital framework now being field-tested in the Summer 2026 GOES-based field test. Those supervisory tracks do not directly govern sponsor-side window design, but they do shape carrier pricing for any buyout that follows a lump sum window in the same plan year, and the downstream pricing effect is visible in the bid ranges carriers return on Q3 and Q4 2026 RFPs.

Why This Matters

The April 2026 Section 417(e) rate print is a small technical publication that sits at the intersection of three separate actuarial workstreams. For plan actuaries, it is the binding rate input into any 2027 lump sum window under a plan with a four-month or five-month lookback applicable month. For benefits consultants and sponsor CFOs, it trims 4 to 6 percent off projected lump sum outflows and compresses projected election rates by a related magnitude. For PRT advisors, it shifts the demographic composition and economics of residual retiree blocks that feed into Q3 and Q4 2026 buyout processes.

The move is not a policy change. It is a monthly data point inside a stable regulatory framework that has governed qualified plan lump sums since PPA 2006 phased in the segment-rate structure and Treasury regulations that followed. What changes every month is the rate set itself, and the April 2026 reading is large enough that it is worth re-running the core arithmetic for any sponsor with a 2027 window in design. The work is not complex, but the numbers in the board materials written three months ago are no longer the numbers that should drive the 2027 authorization.

For plan sponsors approaching the spring and summer board cycle, the priority is a refreshed lump sum value projection, a refreshed uptake curve, and a refreshed settlement accounting shape against the April data. For plan actuaries, it is a check on the stability-period configuration in the payment system and the mortality table in use. For PRT advisors, it is a recalibration of the residual block composition projection for any window-plus-buyout combination sequence. None of that is new analytical work. All of it should be in process before the next monthly 417(e) print arrives in May.