MSCI World Hedged or Unhedged ETFs: which should I choose?

What differs between the two versions

Unhedged MSCI World ETFs are the most popular, and their return includes the USD/GBP exchange-rate effect: when the dollar strengthens against sterling, the return in GBP improves, and vice versa. GBP Hedged ETFs, on the other hand, hedge out the currency risk: the return reflects only the equity performance of the index, stripping out the currency effect. Both versions remain ISA-eligible.

The cost of currency hedging

Currency hedging carries an implicit cost linked to the interest-rate differential between GBP and USD, embedded in the effective TER of the hedged ETF but not always visible from the TER shown on the factsheet alone. During periods of high US interest rates relative to UK rates, hedged ETFs can significantly underperform their unhedged equivalents: the total effective hedging cost can be higher than the stated TER.

Why the hedging cost isn't fixed

The hedging cost comes from what's known as covered interest rate parity: to neutralise currency risk, the fund enters forward contracts whose cost roughly reflects the gap between short-term interest rates in the two currencies involved. When US rates are higher than UK rates — as has been the case at various points recently — the hedging cost for a UK investor is positive and adds to the management TER; when the relationship flips, the cost can shrink, disappear, or in theory even turn negative.

This means the hedging cost isn't a fixed percentage you can budget for once and forget: it moves over time with the monetary policy of the two currency areas, and it's hard to forecast precisely over a long horizon.

Currency effects over the long run: do they really average out?

An argument often made in favour of the unhedged version is that, over very long horizons, USD/GBP swings have historically tended to average out, reducing the net impact on overall return. That's a reasonable observation based on history, but not a guarantee: even multi-year stretches of sustained appreciation or depreciation of one currency against the other have happened before and can happen again, meaningfully affecting the return over a given period — especially if that period coincides with when you need to draw down the money.

For someone with a very long investment horizon (20 years or more) with no need for scheduled withdrawals any time soon, the currency exposure of the unhedged version tends to have a proportionally smaller impact on the final outcome than the cumulative cost of years of hedging. For shorter horizons, the calculation changes — see the next section.

Which one to choose

For most UK investors starting out, the unhedged version is the simpler and cheaper choice: no extra hedging cost, and over the long run the currency effect has historically tended to average out. The GBP Hedged version mainly makes sense if you want to isolate the pure equity performance from the currency effect, or if you have a shorter horizon where currency volatility could disproportionately affect the result — for instance later in drawdown, when scheduled withdrawals leave less time for swings to even out.

Common mistakes

• Treating hedging as "free" protection: the hedging cost is real and variable, not simply a safety bonus with no trade-off.
• Looking only at the stated TER: the TER on a hedged ETF often doesn't fully reflect the actual hedging cost over a given period, which depends on the current interest-rate differential.
• Choosing hedged for "safety" with no specific reason: if your horizon is long and you have no specific reason to isolate equity performance from the currency effect, the cumulative cost of hedging over time can outweigh the perceived benefit.
• Ignoring the impact on a multi-ETF portfolio: if you hold several ETFs with different currency exposures, mixing hedged and unhedged versions without a clear rationale can make it harder to assess your portfolio's overall currency risk.

How to spot which version you're buying

The most reliable way to identify an ETF's version is to read the fund's full name and its KID/KIID document: hedged ETFs typically show "GBP Hedged", "Hedged to GBP" or the abbreviation "(H)" in the official name, alongside an ISIN different from the unhedged version of the same index — these are two genuinely distinct instruments, not two share classes of the same fund. The market ticker often carries a specific suffix too (for example "H" or "HGBP") to mark the hedged version.

Before buying, always check these details on your broker's fund page or the provider's website, rather than relying solely on the shortened name shown in a trading app, which sometimes truncates important information.

Practical checklist

• If you have a long horizon (20 years or more) and no specific need, the unhedged version is generally the simpler choice.
• Don't treat the stated TER as the full cost of currency hedging: the actual cost varies with the GBP/USD interest-rate differential.
• Consider the hedged version mainly if you have a shorter horizon or are in later-stage drawdown with scheduled withdrawals.
• Always check the ISIN and full fund name before buying, to be sure which version you're choosing.
• If you hold several ETFs, assess your overall currency exposure, not just that of each instrument on its own.