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BMO mortgage book reaches $164 billion as 90-day delinquencies climb to 0.56%
Bank of Montreal set aside more money for troubled mortgages in Q3 while adding $164.2 billion in new residential lending, a combination that reveals how the bank is reading the current moment: growth is back, but so is risk.
The 90-day delinquency rate hit 0.56% of the portfolio, up from the pandemic-era lows that hovered near 0.15% in late 2021. That figure sits well below the 1-2% range common in U.S. markets, but the direction matters more than the level. Provisions for credit losses on impaired mortgages have climbed in tandem, signaling that BMO's risk desk expects the trend to continue through at least the next two quarters.
The two-year lag in delinquencies
The uptick arrives nearly two years after the Bank of Canada began raising rates in early 2024. This is the lag effect in action. Borrowers who locked in five-year fixed terms in 2021 at rates near 1.8% are renewing now at rates closer to 4%. The payment shock doesn't hit when policy rates change. It hits when the mortgage contract itself resets.
Employment softness compounds the issue. Canada's real GDP grew at just 0.8% annualized in Q2 2026, according to Statistics Canada. Delinquency rates track unemployment more closely than interest rates alone, and the labor market has been cooling since mid-2025. A borrower who could manage a higher payment in theory often cannot manage it when their hours are cut or their industry contracts.
Variable-rate mortgages with fixed payments created a second failure mode. As rates climbed, more of each payment went to interest and less to principal. Some borrowers hit the trigger point where their payment no longer covered the interest due, and the shortfall capitalized into the principal balance. When those loans come up for renewal, the balance owed is higher than it was at origination, and the new payment reflects both the rate increase and the larger loan.
The portfolio is growing because the worst is near
Banks do not grow their mortgage books when they expect rising losses to accelerate. They grow when they see an opportunity to acquire high-quality borrowers at attractive spreads. The $164.2 billion expansion suggests BMO believes the worst of the default cycle is near its peak.
The housing market in major centers like Toronto and Vancouver has stabilized after the 2024-2025 correction. Prices are no longer falling, inventory has normalized, and transaction volumes are recovering. For a bank, that environment supports growth even if a subset of existing borrowers is struggling. The new loans being originated in 2026 are being underwritten at current rates with current stress tests. They carry less refinancing risk than the 2021 vintage now defaulting.
This creates a bifurcated book: new borrowers with strong credit entering at sustainable rates, and older borrowers renewing into payment levels they cannot sustain. The portfolio grows while delinquencies rise because the two populations do not overlap.
What the provisioning increase actually means
Impaired loan provisions are forward-looking. They reflect the bank's internal forecast of defaults, not just the defaults already visible in the delinquency rate. When BMO increases those provisions, it is embedding an assumption that more borrowers will miss payments in the coming months.
The bank is not provisioning for catastrophic losses. High home equity in most major markets means that even when a borrower defaults, BMO can recover most or all of the loan balance through a power-of-sale process. The provisions are for the cost of managing the default, the carrying cost of the non-performing asset, and the incremental losses on borrowers whose equity has eroded.
The 0.56% delinquency rate is still historically low. But the combination of rising delinquencies, rising provisions, and resumed growth tells a specific story: the bank expects another two quarters of stress among marginal borrowers while the broader market returns to normal. The bank is setting aside reserves for the pain it sees coming in the next two quarters.
Bank of Montreal set aside more money for troubled mortgages in Q3 while adding $164.2 billion in new residential lending, a combination that reveals how the bank is reading the current moment: growth is back, but so is risk.
The 90-day delinquency rate hit 0.56% of the portfolio, up from the pandemic-era lows that hovered near 0.15% in late 2021. That figure sits well below the 1-2% range common in U.S. markets, but the direction matters more than the level. Provisions for credit losses on impaired mortgages have climbed in tandem, signaling that BMO's risk desk expects the trend to continue through at least the next two quarters.
The two-year lag in delinquencies
The uptick arrives nearly two years after the Bank of Canada began raising rates in early 2024. This is the lag effect in action. Borrowers who locked in five-year fixed terms in 2021 at rates near 1.8% are renewing now at rates closer to 4%. The payment shock doesn't hit when policy rates change. It hits when the mortgage contract itself resets.
Employment softness compounds the issue. Canada's real GDP grew at just 0.8% annualized in Q2 2026, according to Statistics Canada. Delinquency rates track unemployment more closely than interest rates alone, and the labor market has been cooling since mid-2025. A borrower who could manage a higher payment in theory often cannot manage it when their hours are cut or their industry contracts.
Variable-rate mortgages with fixed payments created a second failure mode. As rates climbed, more of each payment went to interest and less to principal. Some borrowers hit the trigger point where their payment no longer covered the interest due, and the shortfall capitalized into the principal balance. When those loans come up for renewal, the balance owed is higher than it was at origination, and the new payment reflects both the rate increase and the larger loan.
The portfolio is growing because the worst is near
Banks do not grow their mortgage books when they expect rising losses to accelerate. They grow when they see an opportunity to acquire high-quality borrowers at attractive spreads. The $164.2 billion expansion suggests BMO believes the worst of the default cycle is near its peak.
The housing market in major centers like Toronto and Vancouver has stabilized after the 2024-2025 correction. Prices are no longer falling, inventory has normalized, and transaction volumes are recovering. For a bank, that environment supports growth even if a subset of existing borrowers is struggling. The new loans being originated in 2026 are being underwritten at current rates with current stress tests. They carry less refinancing risk than the 2021 vintage now defaulting.
This creates a bifurcated book: new borrowers with strong credit entering at sustainable rates, and older borrowers renewing into payment levels they cannot sustain. The portfolio grows while delinquencies rise because the two populations do not overlap.
What the provisioning increase actually means
Impaired loan provisions are forward-looking. They reflect the bank's internal forecast of defaults, not just the defaults already visible in the delinquency rate. When BMO increases those provisions, it is embedding an assumption that more borrowers will miss payments in the coming months.
The bank is not provisioning for catastrophic losses. High home equity in most major markets means that even when a borrower defaults, BMO can recover most or all of the loan balance through a power-of-sale process. The provisions are for the cost of managing the default, the carrying cost of the non-performing asset, and the incremental losses on borrowers whose equity has eroded.
The 0.56% delinquency rate is still historically low. But the combination of rising delinquencies, rising provisions, and resumed growth tells a specific story: the bank expects another two quarters of stress among marginal borrowers while the broader market returns to normal. The bank is setting aside reserves for the pain it sees coming in the next two quarters.
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