A target-date fund’s cost is only half the story — the other half is its glide path, the actual formula that decides how much of your money sits in stocks versus bonds on any given day of your working life. Our expense-ratio breakdown covers what these funds cost; this piece covers the mechanics of what you’re actually buying with that fee.
The Curve, Not a Fixed Split
A glide path is a predetermined schedule that reduces equity exposure and increases fixed-income exposure as the target date approaches. Early in a glide path, allocations commonly run 80%–90% stocks. By the time retirement is roughly two decades out, that typically eases to 70%–80% stocks, and by the target date itself, most funds land somewhere in the 30%–55% equity range depending on the provider’s philosophy.
A Real Example of the Shift
A hypothetical 2050 fund might hold around 80% equities and 20% fixed income today, shift to roughly 60% stocks and 40% bonds by 2040, and settle near 30% equities and 70% bonds at the 2050 target date itself. The slope of that curve — how aggressively it de-risks each year — is set by the fund manager, not by any external formula, and it’s rarely disclosed in the fund’s marketing name.
“To” vs. “Through”: Where the Curve Actually Stops
A “to” glide path freezes its allocation on the target date itself. A “through” glide path keeps de-risking for 10 to 20 years past that date before leveling off — meaning a “through” fund is still meaningfully more aggressive than a “to” fund on the day you actually retire, even though both carry the identical target year in their name. “To” glide paths with more conservative pre-retirement allocations have generally held up better in the years immediately surrounding a market downturn, while “through” paths have more often outperformed over a full multi-decade holding period.
Why Two “2055 Funds” Aren’t the Same Fund
Because each manager sets its own curve, a 2055 target-date fund from one provider is not the same risk exposure as a 2055 fund from another — one manager’s fund might hold roughly 30% stocks at a comparable point in the glide path where another holds over 40%, an 11-percentage-point swing in real market exposure hiding behind an identical label.
The Bottom Line
Before assuming your plan’s default target-date fund fits your risk tolerance, pull up its actual glide path illustration (every prospectus has one) and check where the curve lands at your target year — “2050” tells you nothing about whether that fund will be 30% or 45% in stocks the day you retire.
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