Market selloff put Canada’s bank‑heavy index and future mortgage costs back in focus
Canada’s big banks sat at the centre of a sharp equity selloff on Tuesday, as a near‑4% plunge in the S&P/TSX composite index revived questions about how renewed inflation worries, rising bond yields and credit risks could filter through to mortgage borrowers.
The benchmark index was down 3.97% at 33,173.05 in morning trading, on track for its steepest single‑day loss since April 2025.
Materials names were hit hardest: the global gold index slumped about 10%, while the broader materials group dropped roughly 9%.
Miners First Majestic and AYA Gold & Silver each fell more than 13%, and Capstone Copper slid about 13% after missing profit estimates.
Energy shares edged lower even as oil prices jumped more than 16% this week, with spot gold down more than 4% and silver off more than 9% as a stronger US dollar and Middle East tensions rattled commodity markets.
Middle East escalation, funding costs and rates
The rout followed Iranian air strikes on US‑allied Gulf states and concerns the US‑Israeli war on Iran could widen, halting more energy exports and embedding a fresh inflation shock into global markets.
Investors also dumped government bonds, pushing up yields and prompting traders to pare back expectations for rate cuts by the Federal Reserve and other central banks.
“Central bankers actually need to see a protracted rise in inflation more than just a short‑term blip due to energy prices rising as a result of the conflict,” said Shiraz Ahmed, founder at Sartorial Wealth.
“If there is a longer term rise in inflation data or if we see GDP shrink as a result, that will definitely be a large impetus for the central banks to act.”
For mortgage professionals, that matters because Canadian fixed‑rate mortgages remain closely tied to government bond yields. Five‑year fixed‑rate mortgages rise if 5‑year bond yields rise, and the opposite is also true. When bond yields move higher, funding mortgages become more expensive for lenders, who typically pass on at least part of that cost through higher rates.
Big Six banks’ dominance raises mortgage stakes
The selloff also underscores how exposed Canadian borrowers are to shocks in the country’s bank‑heavy equity market.
The “Big Six” banks collectively carried hundreds of billions of dollars in residential mortgages and home‑equity loans; Royal Bank, TD, Scotiabank, CIBC, BMO and National Bank together held well over $1.4 trillion in outstanding residential mortgages by 2024, according to industry data. That balance sheet weight meant even modest percentage moves in their share prices could mask substantial shifts in market value and, over time, in funding appetites.
Meanwhile, Banks Royal Bank (RY) and Bank of Nova Scotia (BNS) were down roughly 1.7% to 2.4%. While the drop was not as steep as in mining, the sheer market cap being wiped out was what pulled the TSX down so sharply.
Insurance firms such as Manulife (MFC) and Great‑West Lifeco (GWO) saw similar 1.5–2% slides as credit spread concerns outweighed the potential benefit of higher interest rates.
Higher rates and slower loan growth have pressured earnings even before the latest geopolitical shock.
Carl De Souza, senior vice president and sector lead, North American financial institution ratings at Morningstar DBRS, described previous results as “a good year for them – and I think that’s attributable to the diversification of their business models and their geographic diversification as well,” but warned that rising impaired loans tied to mortgages renewing at higher rates remain a key risk to watch.
Implications for borrowers and brokers
Those dynamics were already being felt at the household level. Previous survey data showed Canadians wrestling with complex renewal decisions as bond‑driven rate swings pushed fixed offers into the mid‑4% range in 2025 and stress‑test hurdles stayed elevated.
Many borrowers gravitated toward shorter‑term or mid‑term fixed mortgages for “peace of mind” at renewal, trading potential savings for payment certainty as budgets tightened.
For now, the latest TSX slide and commodity spike do not guarantee another leg higher in mortgage rates. But they reinforces a familiar message for experienced brokers and lenders: global shocks could reprice Canadian funding costs quickly, even if the Bank of Canada stays on hold.
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