Target Date Fund Glide Path: “To” vs “Through” and the 10-Point Equity Gap at Retirement
Two funds. Same target year. Same ticker family, even. One holds 40% stocks the day you retire and never moves again. The other holds 50% and keeps cutting for seven more years until it lands at 30%. That 10-to-20-point spread is not a rounding error — on a $600,000 balance it is $60,000 to $120,000 of equity exposure, and almost nobody who owns one of these funds knows which version they have.
The difference has a name: the target date fund glide path, and specifically whether it is built “to” retirement or “through” it. This article explains what separates the two designs, shows you how to find out which one your fund uses in about five minutes, and gives you three decision rules for choosing between them. By the end you will know whether the fund you have been auto-enrolled into actually matches the retirement you are planning.
This matters more than it used to. Vanguard’s How America Saves 2025 found that the share of defined contribution participants whose balances sit in a professionally managed allocation — overwhelmingly target date funds — hit an all-time high of 69%. Morningstar’s 2026 Target-Date Landscape put total target-date assets at $4.8 trillion at the end of 2025, up 20.3% in a single year. Most people did not choose these funds. They were defaulted into them.
The Two Target Date Fund Glide Path Designs, Side by Side
The Department of Labor’s guidance for plan fiduciaries defines the split cleanly. A “to” approach reduces equity exposure over time to its most conservative point at the target date. A “through” approach reduces equity exposure through the target date, so the fund does not reach its most conservative point until years later.
Put plainly: a “to” fund treats your retirement date as the finish line. A “through” fund treats it as a waypoint.
| Feature | “To” glide path | “Through” glide path |
|---|---|---|
| Most conservative point | At the target date | 10–20 years after the target date |
| Typical equity at target date | ~40% | ~50–55% |
| Equity 10 years into retirement | Same as at the target date (flat) | Roughly 25–50%, still declining or newly settled |
| Assumed participant behavior | Rolls out, annuitizes, or spends down early | Stays invested and withdraws gradually for decades |
| Primary risk it manages | Sequence risk in the years right around retirement | Longevity risk — outliving the money |
| Chart shape after target date | Flat line | Continues sloping down, then flattens |
Two of the largest series in the country sit on opposite sides of this line, and their published numbers make the gap concrete. BlackRock’s LifePath Index series is a “to” design: it is anchored at an equity “landing point” of 40%, recently raised from 38%, and that allocation holds constant throughout retirement for anyone who stays in the fund. Vanguard’s Target Retirement series is a “through” design: it holds 90% equity until roughly 25 years from retirement, arrives at 50% equity at the target date, and keeps gliding to a 30% equity stake about seven years later, at which point the fund merges into Vanguard Target Retirement Income.
So a 65-year-old in a LifePath fund and a 65-year-old in a Vanguard Target Retirement fund are 10 points apart on day one — and 10 points apart in the other direction by age 72, since the Vanguard investor has dropped to 30% while the LifePath investor is still at 40%. Same “retire in 2026” label, two materially different portfolios.
Where the 2010 Funds Went Wrong — and What Actually Changed
This debate is not academic, and it has a specific origin date. In 2008, the 31 mutual funds carrying a 2010 target date — funds explicitly marketed to people about to retire — lost an average of nearly 25%. The range was the shocking part: returns ran from –3.6% to –41%, with Oppenheimer’s Transition 2010 fund down 41.3% for the year. Investors two years from retirement, holding funds with the same number on the label, experienced outcomes that differed by nearly 38 percentage points.
The fallout was immediate. The SEC and the Department of Labor held a joint hearing on target date funds on June 18, 2009, examining whether the industry needed regulatory changes or disclosure reform. The core finding was not that equity exposure was inherently wrong near retirement. It was that nobody — including many plan sponsors — could tell you what a given fund’s glide path actually was.
What changed afterward was disclosure, not design. Glide paths are now published, but dispersion across providers remains wide, and the DOL’s own fiduciary guidance still warns that “there are considerable differences among TDFs offered by different providers, even among TDFs with the same target date.” The burden of knowing which design you own shifted onto you.
Want to see what a 10-point difference in equity exposure does to a 30-year balance?
The Case for “Through”: Longevity Is the Bigger Threat
The argument for staying in stocks past the target date is straightforward. Retirement at 65 is not an event, it is a 25-to-30-year holding period, and a portfolio that goes defensive at 40% equity and stays there has to fund three decades of withdrawals with limited growth. Inflation compounds against you the entire time.
The industry has been moving in this direction on the front end, too. Morningstar’s 2026 landscape data shows the median equity allocation for investors 45 years from retirement reached 93% at the end of 2025, up from 89% a decade earlier. Managers have concluded that young savers were under-allocated to stocks, and the same logic — long horizon, time to recover — applies to a healthy 65-year-old with a 30-year horizon.
There is a behavioral argument as well. “Through” designs assume you will stay put and draw down gradually, which is what most people actually do; rolling an entire balance out at 65 is the exception, not the rule. A fund that keeps adjusting for you removes a decision you would otherwise have to make annually, which matters if the alternative is the do-nothing default we cover in our piece on calendar versus threshold rebalancing.
The Case for “To”: Sequence Risk in the Fragile Decade
The counterargument is about timing, not averages. The five years before and after retirement are when a portfolio is simultaneously at its largest and first subject to withdrawals — the worst possible moment for a deep drawdown, because shares sold into a downturn never participate in the recovery. We walk through the arithmetic in detail in our explainer on sequence of returns risk, and the short version is that two portfolios with identical average returns can produce wildly different outcomes depending purely on the order those returns arrive.
A “to” glide path is a deliberate bet that protecting the fragile decade is worth giving up some long-run growth. In volatile markets, lower equity allocations around the target date generally hold up better in the first years of retirement — which is precisely the window where damage is hardest to undo.
The honest framing is that neither design is wrong. They are solving for different failure modes. “Through” is optimized against running out of money at 90. “To” is optimized against a 35% drawdown at 66. Which failure would hurt you more depends on facts about your situation, not about the market.
How to Find Your Target Date Fund Glide Path in Five Minutes
- Pull the fund’s fact sheet or summary prospectus. Search the exact fund name plus “glide path.” Nearly every major provider publishes a glide path chart.
- Find the equity percentage at the target date. If it is near 40%, you are probably looking at a “to” design. Near 50–55%, probably “through.”
- Look at what the line does after the target date. Flat means “to.” Still sloping down means “through.” This single visual is the whole answer.
- Check whether the fund merges into an income fund. Language like “will be merged into the Retirement Income Fund approximately seven years after the target date” is a hallmark of a “through” design.
- Note the expense ratio while you are there. Index-based target date series often run a fraction of the cost of actively managed ones, and that gap compounds — see what fund structure and tax drag do to a taxable balance over time.
One shortcut: if your fund’s name contains “Index” it is usually cheaper, but the word tells you nothing about the glide path. Providers offer both “to” and “through” designs in index wrappers.
Which One Fits You: Three Decision Rules
Rule 1 — Ask what happens to the balance at 65. If you plan to roll the 401(k) to an IRA and build your own allocation the month you retire, the post-target-date portion of the glide path is irrelevant to you. Optimize for the years before the target date instead, and pick on cost and equity exposure at 60 to 65. Our comparison of index funds versus target date funds covers when it is worth building the allocation yourself.
Rule 2 — Count your guaranteed income first. If Social Security plus a pension covers most of your fixed expenses, your portfolio is largely a growth and legacy asset, and the higher equity of a “through” path is defensible. If the portfolio has to cover the majority of your spending from day one, a “to” path’s lower volatility does real work.
Rule 3 — Do not judge the target date fund glide path in isolation. A target date fund is a single-account solution living inside a multi-account life. If you also hold a taxable brokerage account and a Roth IRA, your household equity exposure is what matters, not the label on one fund — and the placement of bonds across those accounts has its own tax consequences, which we unpack in our guide to asset location and where to hold bonds.
A Note From Chris
I am a software engineer, and my instinct with anything defaulted is to open the configuration file and read it. I held a target date fund in an old employer plan for about four years before I ever looked at the target date fund glide path behind it, which is embarrassing given that I read release notes for libraries I will never touch. When I finally pulled it up, it was a “through” design — fine for me, but I had been holding it while separately running a tax-advantaged index fund allocation that was already equity-heavy. My real household allocation was nowhere near what I assumed.
The behavioral economics piece here is the part I find most interesting. A default is not a neutral setting; it is a recommendation with enormous stickiness, and the research on that is not subtle. I do my own planning without an advisor, which means the cost of not reading the fact sheet falls entirely on me. It took eleven minutes. That is the whole story.
Frequently Asked Questions
Is a “through” glide path riskier than a “to” glide path?
In the years immediately around retirement, yes — it holds more equity, typically 50 to 55% versus roughly 40%, so it will fall further in a market decline. Over a 30-year retirement the risk framing flips: the lower-equity path carries more risk of the balance failing to keep pace with inflation and spending. They manage different risks rather than different amounts of risk.
Can I tell which type my fund uses from the name alone?
No. Fund names encode the target year and sometimes the share class or whether it is index-based, but never the glide path design. You have to look at the fact sheet or prospectus. The fastest tell is the shape of the published glide path chart after the target date: flat means “to,” still descending means “through.”
What happens to my money at the target date itself?
Nothing sudden in either design. The fund does not liquidate or convert. With a “to” design the allocation simply stops changing. With a “through” design it keeps shifting for another decade or two; several providers then merge the fund into a standing retirement income fund — Vanguard does this roughly seven years past the target date, landing at 30% equity.
Should I pick a fund with a different year than my actual retirement date?
Some investors do this deliberately to dial exposure up or down — choosing a 2050 fund at age 60 to hold more equity, or a 2030 fund to hold less. It works mechanically, but it is a blunt instrument, and it breaks if the provider changes its glide path. If you want a specific allocation, holding index funds directly gives you precise control; our walkthrough of building a three-fund portfolio covers the setup.
Does the glide path matter if I am 30 years from retirement?
Much less. Most series are 90%-plus equity that far out, and the median allocation for investors 45 years from retirement was 93% at the end of 2025 — there is little room for providers to differentiate. Cost and the equity allocation in your 50s and 60s matter far more than the post-retirement design when your horizon is that long. Revisit the question around age 50.
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