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DIY vs. done-for-you
Mechanically, almost the same portfolio. A target-date fund is a US stock fund, an international stock fund, and a bond fund bundled into one ticker, with an automatic glide path that shifts the mix for you and a fee for the privilege. A three-fund portfolio is the same three ingredients, held separately, at your own risk of forgetting to adjust them. Neither one is the wrong answer — the real choice is cost versus effort, not diversification.
The classic three-fund portfolio — a US total-market fund, an international fund, and a bond fund — touches three of the 15 real asset-class buckets in Portfolio Lab’s own overlap check (see how many funds should I own), which treats a target-date or balanced fund as one bucket for the same reason: it already blends those same three ingredients internally. The part a three-fund portfolio doesn’t do on its own is the glide path. Per Portfolio Lab’s own bond-allocation guide, a typical target-date fund runs roughly 90% stocks when the target date is decades away, gliding down to roughly 30–50% stocks by the date itself.
Using the representative low-cost funds Portfolio Lab’s own planner assigns to each asset class — VTI at 0.03%, VXUS at 0.05%, BND at 0.03% — a 60/30/10 three-fund mix blends to roughly 0.04%/yr. A target-date fund holds similar underlying index funds but adds a management layer for the glide path and rebalancing, so its published expense ratio typically runs higher than that. It isn’t usually a dramatic gap, but expense ratios compound for as long as you hold the fund — see expense ratio impact over 30 years for what even a fraction of a point costs over decades.
Less than it sounds like it should. Portfolio Lab’s own regression tests on a classic 60/40 mix show a portfolio rebalanced annually and one left to drift completely untouched differ by under 2 percentage points of CAGR over the full available history — see how often should I rebalance. A target-date fund’s internal rebalancing removes the risk that you never actually get around to it yourself, which has real value, but the site’s own numbers don’t show it adding return beyond what a once-a-year habit already captures.
Build the glide path yourself
Portfolio Lab’s planner runs the same logic a target-date fund or robo-advisor uses — time horizon, risk capacity, diversification — and outputs specific funds and weights you can inspect and backtest, instead of a mix packaged inside a ticker.
Plan an allocation →Functionally, close. Portfolio Lab's own asset-class map treats a target-date or balanced fund as a single bucket because it already blends US stocks, international stocks, and bonds inside one ticker (see how many funds should I own). The difference is that a three-fund portfolio's split stays wherever you set it until you change it; a target-date fund's split shifts on its own every year.
Building it yourself is usually cheaper. A 60/30/10 VTI/VXUS/BND mix using this site's own representative expense ratios (0.03%, 0.05%, 0.03%) blends to roughly 0.04%/yr. A target-date fund wraps similar underlying index funds with a management layer on top, so its published expense ratio is typically higher than the DIY version. It's rarely dramatic, but run the actual number through the expense-ratio impact page to see the 30-year dollar effect.
Not by ticker. Portfolio Lab's asset-class map is built for funds with a fixed weight, and a target-date fund's mix changes every year by design, so it isn't in that map. Build the three-fund equivalent instead — VTI, VXUS, and BND at roughly your fund's current stock/bond split — and backtest that, or use the planner below to generate the same glide path a target-date fund would.
Educational, not advice. Expense ratios and glide-path figures reflect Portfolio Lab’s own representative funds and planner logic, not any specific target-date fund’s actual prospectus — check your fund’s current fact sheet for its real expense ratio and glide path.