The Oil Rally That Backfired on the Loonie: What's Really Driving USD/CAD

The Canadian dollar just touched a one-week low against the greenback — 1.3885 per U.S. dollar, or 72.02 U.S. cents, after sliding 0.4% in a single session — and then the U.S. dollar bulls paused. The pause is the telling part. A currency pinned near its low while the other side catches its breath is a market waiting for one signal to move, and every other input into USD/CAD has already been absorbed.

That's the puzzle worth unpacking, because on the surface the loonie should be climbing. Canada has an oil rally, a labor market that added 75,000 jobs in July, unemployment at a two-year low of 6.4%, and an economy tracking 3.4% annualized growth in the second quarter — a strong rebound after two quarters of little or no growth. In the textbook, that's a recipe for a stronger currency. Instead the loonie sits near 1.39 and the dollar is the one taking a breather.

The textbook gets the direction right and misses the chain. Rising crude should help the currency of an oil exporter, and crude did rise — a war rally, with WTI whipped from the mid-$50s at its 52-week low to near $118 at its peak, and back to roughly $82 today as Iran and Oman talk. But a war-driven oil spike does two things the simple "oil up, loonie up" rule overlooks. It reignites inflation on both sides of the border, and it reaches the currency through each central bank's reaction. That's where the loonie's luck ran out.

The engine is the gap between two policy rates. The Federal Reserve holds at 3.50%–3.75% and has now left rates there for five straight meetings; last month's vote was 9–3, with three members on record wanting a quarter-point hike. The Bank of Canada, meanwhile, is at 2.25% and done cutting. That leaves roughly 1.3 percentage points of extra yield in the dollar's favor — and money follows yield. When one central bank pays more than the other, cash migrates to capture the spread and bids that currency up, mechanically and relentlessly. That differential alone would keep USD/CAD elevated even if everything else were quiet.

Now the cruel part: the very spike that should have cheered the loonie did the opposite, because it travelled through the Fed. Canada's own inflation hit 3.0% in July, driven by gasoline up 25.7% year over year. But the numbers that move this pair are American. Core PCE — the Fed's preferred gauge — ran 3.3% over the year in July, with headline at 3.7%. That is what turned 2026 expectations on their head: markets began the year pricing at least one rate cut, and the energy shock flipped them to debating a hike at the September meeting. It's the same force behind the dollar's 2026 comeback after a weak 2025, when it reclaimed the 100 level in June for the first time in over a year.

Notice what the dollar is not telling you. It isn't strong because the U.S. economy is booming — payrolls actually slipped in July. It's strong because the Fed's posture on inflation hardened. That's a positioning story, not a growth story, and positioning is exactly what moves currency spreads. It also means the Canadian carry advantage the oil rally should have created got swallowed whole: higher crude raised U.S. inflation expectations, kept the Fed tight, and handed the yield gap to the dollar.

Then the policy shock landed on top of the cyclical one. The U.S. imposed 50% tariffs on roughly $20 billion of Canadian goods after bilateral talks collapsed, and Ottawa is retaliating dollar-for-dollar — duties of 15% to 50% on more than 700 American products starting September 8. Strategists say the dispute "capped the currency's recent recovery by reviving concerns over exports, investment and business confidence". This is the supply-side event that can override a cyclical read: it taxes the export channel that would otherwise lift the currency, keeps exporters hesitant, and gives the Bank of Canada a reason to stay cautious on an economy with a trade millstone around it.

So the near-term verdict is a stalemate, and the market is pricing the two triggers that break it. The FOMC on September 15–16 is roughly one-in-three priced for a hike, and new chair Kevin Warsh delivers his first Jackson Hole speech this week amid higher yields and a positioned market — a hawkish tilt pushes the pair toward and beyond the 1.40 mark, a dovish one lets today's pause turn into a real pullback. The other test lands within days: Canada's official second-quarter GDP, which tells you whether the 3.4% rebound survives the tariff shock it was running into.

Where this leaves a U.S. investor is simpler than the charts make it look. A strong dollar right now is not a U.S. growth signal — it's a liquidity signal, the same force that has left bitcoin trading roughly a third below its 52-week high and pressurized risk assets the world over. When the Fed refuses to cut or threatens to hike, it drains liquidity from everything priced elsewhere, Canadian assets included. The offset is that much of this is already in the price. Five major banks — NBC, TD, Desjardins, BMO and CIBC — all project the loonie recovering over the coming year, from an average of 1.40 in Q3 to 1.38 in Q4 and into the mid-1.36s by 2027. But every one of those forecasts is conditioned on the same three things: oil holding its gains, the tariffs easing, and the Fed not following through on the hike talk.

Watch those three, not the candles. The trade didn't hand you a target; it handed you both central banks' postures in a single number, and the list of what has to change if you expect that number to move.