At the end of 2025, $4.8 trillion sat in target-date funds, a 20.3% jump in one year, according to Morningstar’s 2026 Target-Date Fund Landscape. Most of the people who own one never chose it. They were auto-enrolled in a 401(k), the plan had a default investment, and the default handed them the fund whose year sat closest to their 65th birthday. That is where how target date funds work stops being a trivia question. The number on the label is not a product specification. It is a convention, and the real investment decision lives behind it.
A target-date fund is one decision sold as a product
Strip away the branding and a target-date fund is a fund that owns other funds, usually stock and bond index funds, in proportions that shift automatically as the year on the label approaches. You buy it once. It rebalances without being asked. It gets more conservative on a schedule you never have to remember.
That bargain is genuinely good, and the price has collapsed. Morningstar found the asset-weighted average expense ratio for target-date mutual funds fell to 0.27% in 2025, down from 0.55% a decade earlier, with the cheapest options now charging 4 basis points. A saver with $150,000 is paying about $405 a year at the industry average and about $60 at the low end.
What went the other way is less obvious. How much of your money sits in stocks, and how fast that share falls as you age, is the single choice that shapes most of a forty-year outcome, and it now belongs to a committee at an asset manager your employer picked from a shortlist. Outsourcing it is reasonable. Not knowing what was chosen is a different thing.
How target date funds work: the glide path is the entire product
The schedule is called a glide path, and it is the thing you actually bought. It sets what share of the portfolio sits in stocks at every distance from the target year, and it moves in one direction as that year gets closer.
Glide paths have gotten bolder. Morningstar’s data shows the median equity allocation for savers 45 years from retirement stood at 93% at the end of 2025, up from 89% a decade before. The reasoning managers give is structural rather than tactical: interest rates stayed low enough through the 2010s and early 2020s that bonds looked unattractive by comparison, and life expectancy has trended up, which lengthens retirement and raises the risk of outliving a balance. More stock is their answer to both.
So the fund does two separate jobs. It rebalances you back to the schedule when markets pull you off it, and it moves the schedule itself, year by year, without telling you.
The same year on two labels can mean 34 percentage points of stock
No regulator defines what a 2050 fund must hold. Two firms can print the same year on the cover and build entirely different portfolios underneath it, and nothing requires them to be comparable.
Morningstar measured it. The median gap in equity exposure between the most aggressive and the most conservative target-date series was 34 percentage points in 2025, and that is the narrowed figure. In 2015 the gap was 49 points. The convergence has happened mostly at the young end, where nearly everyone now starts at 90% stock or more. During the middle saving years and at retirement itself, managers still disagree sharply, because they disagree about how fast a fifty-year-old should be taking risk off the table.
Real examples make the range concrete. BlackRock’s LifePath Index Growth series, which Morningstar brought under coverage in 2025 with a Gold rating, holds 50% equity at retirement and keeps holding it afterward, a deliberately more aggressive posture than the firm’s own flagship LifePath Index lineup. At the other extreme, John Hancock’s Preservation Blend series started at 82% equity and fell all the way to 8% at retirement. It liquidated in 2023 after nine years, which tells you something about how the market rewarded that choice.
Now put money on it. Imagine $250,000 in a fund at your retirement date. At 50% equity, $125,000 of that is in stocks. In a fund 34 points lower on the glide path, roughly 16% equity, only $40,000 is. A 20% stock market decline in your first year of retirement takes $25,000 out of the first portfolio and $8,000 out of the second. Same balance, same year printed on the cover, $17,000 of difference in a single bad year. Repeat the exercise with a 20% gain and the aggressive fund wins by the same amount. That is the trade, and it was made for you.
You may not be able to look up what you own
There is a second layer of opacity, and it is newer. Target-date collective investment trusts passed mutual funds as the dominant vehicle in 2024 and reached 54% of all target-date assets by the end of 2025.
A collective investment trust is a bank-administered pooled vehicle available only inside retirement plans. It usually costs less than the equivalent mutual fund, which is why plan sponsors keep converting: Morningstar’s top five managers alone reported $54.3 billion of mutual fund to CIT conversions in 2025. The catch is that a CIT has no ticker, files no prospectus, and does not appear on Morningstar.com or any other public fund database. If the target-date fund in your plan is a CIT, you cannot go look up its holdings the way you can with a mutual fund. Your only source is the plan’s own fund fact sheet.
Five firms hold 80% of all target-date assets, and Vanguard alone runs $1.8 trillion of it, roughly 37% of the market, which means your employer’s choice was made from a very short menu.
To and through are two answers to the same question
The other axis managers disagree on is what happens after the target year. As FINRA explains it, a “to” glide path stops moving at the retirement date and holds that mix from then on, while a “through” glide path keeps de-risking for another ten, fifteen, or twenty years past it.
The disagreement is real, and it is about which of two risks frightens you more. A “to” design protects against sequence-of-returns risk, the damage a market drop does when it lands in the first few years of withdrawals, when you have the most money and are starting to spend it. A “through” design protects against longevity risk, the chance you live another thirty years and needed the growth after all. BlackRock’s case for holding 50% equity at and beyond retirement is exactly that longevity argument, and Morningstar notes in the same breath that it raises sequence risk. Two funds can hold identical assets today and part ways completely at 66.
The default is being rebuilt again, and private assets are next
In August 2025 an executive order titled Democratizing Access to Alternative Assets for 401(k) Investors directed the Department of Labor to revisit its fiduciary guidance under ERISA and report back by February 2026. The Department proposed a rule in March 2026 creating a safe harbor for fiduciaries who evaluate alternative investments against six documented factors: risk-adjusted performance, fees, liquidity, valuation, benchmarks, and complexity. More than 46,000 comments came in.
Product followed policy. BlackRock announced a target-date fund holding private credit and private equity alongside stocks and bonds, built with Great Gray Trust and slated for 2026. Larry Fink has floated 50/30/20 as the new standard mix, with that last slice in private assets. Research from Georgetown’s Center for Retirement Initiatives, cited by the Department in its own analysis, found that allocations of 15% to 20% to alternatives could lift retirement income by 6% to 8% net of fees in a 2022 study, and a 2025 follow-up covering five worker profiles put the improvement at 7% to 8%.
Notice that two of the Department’s six factors are liquidity and valuation. Those are there because a target-date fund prices every day and pays out every day, while the assets being added to it do neither. That tension is the open question, and it will be answered inside a fund most participants were defaulted into rather than one they picked.
Which brings the whole thing back to a single page. Understanding how target date funds work means reading your plan’s fund fact sheet, finding the glide path chart, and looking at one number: the equity allocation at the target year. If it says 50% and you expected 30%, the fund is doing what it promised. It just never promised you the number you assumed. While you are in there, the expense ratio on the sheet is worth the same ten seconds, and if you are carrying an old plan from a former employer, the rollover rules decide whether you get to choose a different glide path at all.