Two Funds, Same 500 Stocks, One Big Difference
Buy a Canadian-listed S&P 500 ETF and you are making two bets at once: one on US stocks, and one on the US dollar. The unhedged version gives you the market's return plus or minus whatever the USD/CAD exchange rate does. The hedged version quietly cancels the second bet, aiming to deliver the market's return as if the exchange rate never moved.
What Currency Hedging Actually Is
A hedged ETF holds the same US stocks as its unhedged sibling. On top of that, it sells US dollars forward: contracts agreeing to exchange a set amount of US dollars for Canadian dollars at a rate fixed today, typically one-month forwards reset every month.
If the US dollar falls, the stocks lose value in Canadian-dollar terms — but the forwards gain by roughly the same amount. If the US dollar rises, the stocks gain — and the forwards lose. Either way, the currency move is largely cancelled.
BMO's pair shows the structure plainly: ZUE, the hedged BMO S&P 500 ETF, holds the unhedged BMO S&P 500 Index ETF (ZSP) and hedges the dollar exposure back to Canadian dollars. Same stocks — with an insurance policy stapled to them.
The $10,000 Test: What Hedging Does to Your Return
Say you invest $10,000, the market goes nowhere, but the US dollar falls 5% against the loonie. Unhedged, your stocks are worth about $9,500 — the market did nothing and you still lost roughly 5%. Hedged, the forward contracts gain what the currency took away, and you stay near $10,000, minus the small cost of the hedge.
Now the market rises 10% in US dollars while the dollar falls 5%. Unhedged: $10,000 × 1.10 × 0.95 = $10,450 — currency ate half your gain. Hedged: you keep close to the full market return, about $11,000 minus hedging costs.
Flip it once more — US dollar up 5% on a flat market — and the unhedged investor gets a free boost to roughly $10,500 while the hedged investor gets nothing extra. The forwards hand that gain back.
That symmetry is the point most marketing skips: hedging removes currency return in both directions. It trades away the good currency years along with the bad ones. What you get in exchange is a smoother ride that tracks the stock market itself, not the foreign-exchange market.
What the Hedge Costs (It Is Not the MER)
The surprise: the sticker price is often identical. On BMO's official factsheets dated September 30, 2026, ZSP (unhedged) and ZUE (hedged) both show a management fee of 0.08% and a MER of 0.09%.
The real cost hides in the forward contracts. A forward rate is not the spot rate — it is set by the interest-rate gap between the two countries. When US rates sit above Canadian rates, selling US dollars forward locks in a rate a bit worse than today's spot rate, and that gap — roughly the Canada–US interest-rate differential — becomes a steady drag on the hedged fund. When Canadian rates are higher, the math can run the other way. Add a little slippage, because the hedge resets monthly while markets move daily: same MER, plus or minus the rate differential, plus small tracking friction.
One Thing Hedging Does Not Touch: Dividend Withholding Tax
Pick hedged or unhedged and the tax picture does not change. Under the Canada–US tax treaty, US dividends paid to a Canadian recipient face withholding of 15% in the standard portfolio case (Article X of the Convention) — and a Canadian-listed ETF, hedged or not, receives its US dividends net of that withholding inside the fund.
Do not confuse this with the RRSP exemption. The treaty also exempts income earned by organizations operated exclusively to provide pension and retirement benefits (Article XXI) — an account-level rule about retirement plans, not a feature of any ETF. Choosing the hedged twin changes your currency exposure. It does not change your withholding tax.
Who Each One Suits
- Hedged tends to fit shorter horizons and money earmarked for Canadian-dollar spending: a home purchase in two years, tuition, near-term retirement withdrawals. When the bill comes due in loonies, a 5% currency swing in the wrong month can hurt more than a decade of returns helps.
- Unhedged tends to fit long horizons. Over 20 or 30 years, currency swings have historically gone both ways, the forward-cost drag compounds quietly, and US dollar exposure can itself act as a shock absorber — the greenback often strengthens in global crises, cushioning a Canadian portfolio when stocks fall hardest.
Neither choice requires a view on where the loonie goes next — nobody forecasts currency reliably. It is simply a decision about which risk you would rather live with.
The Twikup Take
Hedging is a volatility decision, not a return decision. It makes your US holdings behave like US holdings — no more, no less. Spending the money in Canadian dollars soon? That calm is worth paying for. Investing for decades? The unhedged version's currency swings are the price of admission, and history suggests they wash out.
The best hedge is the one matched to when you will spend, not to where you think the dollar is headed.
Image: AI-generated illustration.