Every investor eventually learns that a price held artificially still is a price about to move. That is exactly the setup building in Canadian mortgage markets right now, and readers who ignore it will be caught off guard by financing costs in the coming weeks.
Government of Canada bond yields, the true engine behind fixed rate mortgages, have surged 92 basis points since February, with the 5-year yield hitting 3.65 percent, its highest level since May 2024. Under normal conditions, mortgage rates track that move closely. This time they have not. National Bank senior economists Daren King and Kyle Dahms found that mortgages have only priced in about 40 basis points of that increase. Someone is absorbing the difference, and it is not the bond market.
That someone is the lender. The spread between the benchmark bond yield and the mortgage rate charged to borrowers, normally around 135 basis points based on recent history, has compressed to just 75 basis points. Lenders have been quietly eating roughly 60 basis points of margin to keep credit demand alive. For investors, this is the part of the story that matters most: compressed spreads are a temporary subsidy, not a structural feature of the market. National Bank called it plainly, warning that such a narrow spread puts pressure on lender margins and is unsustainable in the long run.
What this means practically is that the 11 quarter run of affordability improvements, driven by softer prices, cheaper financing, and rising real incomes, is expected to end in the third quarter of this year. National Bank projects affordability eroding by 1.1 percentage points by the fourth quarter as lenders rebuild the margin they have been giving away.
Mortgage rates are therefore likely to rise in the coming weeks, marking the first deterioration in affordability in three years.
This is where the bank calls start to diverge, and where the opportunity for a disciplined investor lies in reading the disagreement rather than picking a side. RBC has pointed to firming home prices as a sign the market has bottomed, though it is worth noting this marks their eighth attempt at calling a bottom in four years. BMO takes a more grounded position, expecting home prices to stay under pressure given rising financing costs and softening income growth tied to trade uncertainty.
Both views can be true at once. If financing costs rise faster than home prices adjust downward, the market becomes less efficient, and that inefficiency tends to show up as slower transaction volume rather than a clean price correction. For investors, the practical takeaway is straightforward: variable rate exposure and near term renewals deserve fresh scrutiny now, before lenders finish repricing risk. Locking in strategy ahead of a margin rebuild has historically been worth more than reacting after the fact.
Source: Better Dwelling, “Canadian Mortgage Rates Set To Rise As Lender Margins Collapse”.
