Vanguard and TIAA launched a target-date series on December 3, 2025 that builds a lifetime annuity into the glide path, and plan sponsors can begin mapping it into their lineups in the second half of 2026. The Vanguard Target Retirement Lifetime Income Trusts follow the same glide path as the flagship funds until age 55, then start routing contributions into the TIAA Secure Income Account, reaching a 25% annuity allocation by age 65. It is the clearest signal yet that in-plan lifetime income is moving from a niche checkbox to a default building block of the American 401(k).
The product is the headline. The shift behind it is the story. For two decades the defined contribution system has been an accumulation machine that hands a worker a lump sum at 65 and wishes them luck. A growing roster of asset managers now wants to bolt a paycheck onto the back end, and the regulatory cover to do it already exists.
Key Takeaways
- Vanguard and TIAA’s Target Retirement Lifetime Income Trusts embed the TIAA Secure Income Account, shifting to a 25% annuity allocation by age 65, available to map into plans in the second half of 2026.
- Only 8.9% of plans offered an in-plan annuity for the 2024 plan year, per the Plan Sponsor Council of America, while MetLife’s 2026 Lifetime Income Poll found 59% of sponsors support requiring lifetime income and 54% support defaulting savings into it.
- BlackRock’s competing LifePath Paycheck grew from $9 billion in May 2024 to $25.7 billion by October 2025; other annuity-embedded target-date assets more than doubled to $3 billion.
- On a $200,000 annuity sleeve, mortality credits can lift guaranteed income roughly 70% above a 4% portfolio draw on the same money, at the cost of liquidity and inflation indexing.
- The catch nobody markets: the annuity sleeve is tied to the plan, so a participant who changes jobs often cannot roll the guaranteed-income piece to an IRA in kind.
What Did Vanguard and TIAA Actually Launch?
The Vanguard Target Retirement Lifetime Income Trusts are collective investment trusts, so they live only inside 401(k) plans, not in retail brokerage accounts. Until age 55, a participant’s money rides the same glide path as Vanguard’s standard target-date series. At 55 the trust starts steering a slice of the balance into the TIAA Secure Income Account, a fixed annuity that accumulates a guaranteed base the participant can later switch on as income for life.
By 65 the annuity reaches 25% of the portfolio. The other 75% stays invested in the usual Vanguard index building blocks. The participant then chooses whether to convert that 25% into a lifetime stream or leave it as an account balance. Nothing forces annuitization, which matters for both the behavioral and the fiduciary case.
Cost is the part Vanguard leaned on. The TIAA Secure Income Account carries no separate expense ratio, so the firm expects total costs to land at or below its standard Target Retirement Funds, where fees start at 0.08% for the mutual fund version and run lower for collective trusts at scale. “Retirement isn’t one-size-fits-all, and for those who want more predictability, guaranteed income can provide added peace of mind alongside their savings,” Vanguard’s Lauren Valente said at launch. TIAA’s Colbert Narcisse framed it as giving sponsors “a low-cost, more secure path to and through retirement.”
The design echoes the structural shift we flagged when collective investment trusts passed mutual funds in target-date assets. The CIT wrapper is doing the heavy lifting again, this time to house an insurance product the mutual fund structure handles poorly.
Why Is In-Plan Lifetime Income Suddenly Everywhere?
Three forces converged. The first is legal. SECURE 2.0 and the original SECURE Act handed plan sponsors a fiduciary safe harbor for selecting an annuity provider, which removed the liability fear that kept guaranteed income out of plans for years. A sponsor who runs the prescribed due diligence on the insurer’s financial strength is protected even if that insurer stumbles a decade later.
The second is demand data that sponsors can no longer ignore. MetLife’s 2026 Lifetime Income Poll found 90% of plan sponsors now say a defined contribution plan’s core purpose should be to generate income in retirement, a marked shift from treating it as a pure savings pot. In the same poll, 59% supported requiring 401(k) plans to offer lifetime income, and 54% backed defaulting a portion of savings into a guaranteed stream. Goldman Sachs Asset Management’s plan-sponsor work points the same way, with 79% ranking in-plan retirement income a top-three priority over the next three years.
The third is money already in motion. BlackRock’s LifePath Paycheck, the product that proved a major recordkeeper could put an annuity inside a target-date default, climbed from $9 billion in assets in May 2024 to $25.7 billion by October 2025. Assets in other annuity-embedded target-date strategies more than doubled to $3 billion over the same stretch. Vanguard, which controls the largest target-date book in the country, entering the category is the competitive answer to BlackRock’s head start.
Set against that momentum, actual adoption is still tiny. The Plan Sponsor Council of America’s 68th Annual Survey found only 8.9% of plans offered an in-plan annuity for the 2024 plan year, roughly 1,000 employers. The gap between 8.9% offering and 59% of sponsors saying plans should be required to offer is the entire commercial opportunity, and every large asset manager has now noticed it.
How Much Income Does a 25% Annuity Sleeve Actually Buy?
This is where the brochure goes quiet and the planning math earns its keep. Take a participant who reaches 65 with $800,000 in the trust. The 25% annuity sleeve is $200,000. The question every advisor should be able to answer is what that $200,000 buys as guaranteed income versus leaving it in the portfolio.
In the 2026 rate environment, a single-life income annuity for a 65-year-old pays in the neighborhood of 6.9% a year, so $200,000 floors roughly $13,800 of guaranteed annual income for life. Draw that same $200,000 inside the portfolio at a 4% rate and it supports about $8,000 a year. The annuitized slice produces close to 70% more spendable income, and the reason is mortality credits: the payout blends return of principal, interest, and the pooled funds of annuitants who do not live as long. No invested portfolio can manufacture that pooling effect, because it is not an investment return at all.
Stack the pieces and the household picture changes. The annuity floors about $13,800. The remaining $600,000 drawn at 4% adds about $24,000. Total spendable income lands near $37,800, against roughly $32,000 if all $800,000 were drawn at a flat 4%. That is close to 18% more income, with the floor portion guaranteed regardless of how long the client lives or how markets behave.
The trade is real and belongs in the conversation. The annuity payout is largely level, so it does not climb with inflation the way a 4% rule withdrawal is designed to. The $200,000 also stops being a liquid, inheritable asset once converted. A client who values bequest and inflation protection over a higher guaranteed floor may want a smaller sleeve, which is exactly why the design lets the participant decline conversion. For the decumulation toolkit around this decision, the QLAC carve-out that defers RMDs past 85 solves a related but distinct problem on the IRA side.
The Portability Catch Nobody Markets
Here is the structural snag the marketing skips. The annuity sleeve is welded to the plan. The TIAA Secure Income Account is an institutional contract held inside the employer’s 401(k), and the guarantee is priced and administered there. A participant who changes jobs, the median American worker holds 12 over a career, cannot simply roll the guaranteed-income piece into an IRA in kind and keep the accrued payout terms.
This is the same friction that haunts the broader move into collective trusts. A CIT has no ticker, no prospectus, and no retail share class, so when a participant leaves, the recordkeeper typically liquidates the position to cash and the worker rebuilds at retail. Layer an annuity on top and the problem compounds: the accrued annuity base, the locked-in payout rate, and any interest credited may not travel cleanly to the next plan or to an IRA. Portability provisions exist and are improving, but they are contract-specific and far from the seamless rollover savers assume.
For a worker who stays put, the in-plan annuity is a genuine pension substitute. For the job-hopper, the guaranteed-income value can leak every time they move, unless the plan and the provider support a true in-kind transfer of the annuity. Advisors fielding rollover questions in 2026 need to ask whether a departing client holds one of these sleeves before reflexively recommending a rollover, because cashing out the annuity base can forfeit value the participant paid for.
Will the Annuitized TDF Become the New Default?
The real prize is the qualified default investment alternative. Target-date funds already dominate 401(k) defaults because auto-enrollment funnels new hires straight into them. If an annuity-embedded target-date series qualifies as a QDIA, every auto-enrolled worker could drift toward guaranteed income without lifting a finger, which is precisely what the 54% of sponsors favoring a default want.
The fiduciary calculus is heavier than for a plain index TDF. A sponsor defaulting workers into a product with an insurance component must document the annuity-provider selection under the SECURE safe harbor, monitor the insurer’s strength over decades, and weigh cost and portability against the income benefit. That is more work than rubber-stamping a 0.08% index glide path, and it is why adoption will lag demand even as products multiply.
The likely path is gradual. Large plans with dedicated investment committees move first, smaller plans follow once recordkeepers package the diligence and the pricing falls. The annuity sleeve sizing, 25% in the Vanguard-TIAA design, is conservative by intent, enough to floor essential spending without converting the whole balance into an illiquid stream. Expect that to become a design standard rather than an outlier. The 2026 contribution and limit picture, including the $24,500 deferral cap and SECURE 2.0 catch-up rules, sets how much a worker can push into these vehicles on the accumulation side.
Three Questions Plan Sponsors and Advisors Should Be Asking
The in-plan income wave rewards the advisor who reads the contract, not the press release. Three questions belong on the agenda before any client maps into one of these series or rolls out of one.
1. Does the in-plan annuity travel if the participant leaves, and on what terms? Confirm whether the provider supports a true in-kind transfer of the accrued annuity base and payout rate to an IRA or successor plan. If the answer is liquidation to cash, the guaranteed-income value is conditional on staying with the employer, and that changes the rollover advice for every departing client who holds one.
2. Is the 25% sleeve the right size for this client’s bequest and inflation goals? A higher guaranteed floor comes at the cost of liquidity and inflation indexing. Size the annuity allocation to the income the client needs floored, not to the default percentage, and use the opt-out for clients who value heirs and purchasing power over the higher payout.
3. For a plan sponsor, does the insurer pass the safe-harbor diligence today and on an ongoing basis? The SECURE annuity safe harbor protects a documented selection, not a one-time decision. Build the monitoring cadence for the insurer’s financial strength into the investment policy statement before defaulting a single auto-enrolled worker into guaranteed income.
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