Most target date funds hold a meaningful allocation to non-US equities. Since the eventual spending is in dollars, the reasoning behind that allocation is worth setting out.
The diversification argument
Economies and markets do not move together perfectly. Holding companies exposed to different demand conditions reduces the chance that one country's downturn dominates a portfolio.
The benefit depends on correlation being less than complete. When markets fall together in a global shock, the protection is smaller than the long-run average suggests.
Proponents argue the case still holds over a working lifetime, because the periods of divergence are long even if crises synchronize.
Why market weight is one starting point
Global equity indexes weight countries by market value. On that basis, a substantial share of listed company value sits outside the United States.
A fund that held only domestic shares would therefore be making an active bet against a large part of the world's listed equity, whether or not it framed it that way.
Some fund families use global market weights directly; others deliberately hold less foreign exposure than market weight, and both approaches are defended publicly.
What home bias reflects
Investors in almost every country hold more of their own market than its global weight would imply. This pattern is consistent and long-standing.
Explanations include familiarity, tax and account structures, currency matching with future spending, and lower costs of holding domestic securities.
Whether the tilt is a rational response to liabilities or a behavioral artifact is genuinely disputed, and fund providers land in different places on it.
How currency exposure enters
An unhedged foreign holding combines the local return with the change in the exchange rate. Both contribute to the dollar return a US investor experiences.
Over short periods currency movement can dominate. Over long horizons its contribution to average return has historically been smaller, while still adding variability.
Hedging removes much of that variability at a cost, and practice varies: many funds hedge foreign bonds while leaving foreign equity unhedged.
Why the allocation shifts with the glide path
A target date fund reduces equity as the target year approaches, and the foreign portion usually shrinks with it rather than being cut separately.
The reasoning is that variability matters more as the horizon shortens, and that a retiree's spending is in dollars, so currency exposure is less comfortable near the end.
Comparing two funds with the same target year often reveals materially different foreign weights, which is a design choice disclosed in the prospectus rather than a mistake.