Oil prices are soaring, and so are fixed mortgage rates. Should you go variable?

Five-year insured fixed mortgage rates have risen to 4.09% from 3.79% since early March (+30 bps), costing a borrower with a $500,000 mortgage about $80 more per month and ~$7,064 more in interest over five years. The five-year Government of Canada yield has stayed above ~3.1% (3.08% on Thursday) amid bond sell-offs driven by higher oil prices and Iran war risk, widening the fixed-variable spread to 74 bps (fixed 4.09% vs variable 3.35%). Variable-market share increased to >30% of deals (vs 19% in December), but the Bank of Canada could still need ~75 bps of hikes (three 25-bp moves) to close the gap, creating downside risk for variable borrowers and ongoing upward pressure on mortgage pricing.

Analysis

The geopolitical shock to energy has re-priced duration and real-rate expectations, and that repricing transmits to mortgage economics through the long-end funding channel rather than retail credit risk. That mechanism favors originators and distribution channels that can re-price quickly or reallocate into floating-rate pools, while creating a growing cohort of households with concentrated short-rate exposure and limited buffers.

Second-order effects will bifurcate the housing ecosystem: transaction volumes and discretionary renovation/ownership-related spend are likely to soften, pressuring intermediaries (brokers, builders, home services) before mortgage book losses appear. For banks, incremental new-origin NIM can improve as fixed spreads re-set, but asset–liability duration mismatch and potential prepayment/policy-response volatility will raise funding and capital planning complexity.

Key catalysts and timelines are stacked: near-term moves will be driven by conflict newsflow and oil, measurable in days–weeks via sovereign yield swings; policy reaction and credit feedback loops take months to crystallize through labour/cashflows and central bank decision lags. Tail scenarios include a rapid geopolitical de-escalation that snap-backs yields lower, or a persistent energy shock that forces outsized policy tightening and higher delinquencies over quarters.

The consensus framing — that borrowers should simply “choose variable” to save today — underweights optionality loss and systemic concentration risk. If a material share of borrowers shift to floating and rates rise, the macro response may not be symmetric; regulators or the central bank could intervene to stabilize credit, capping upside in rates but raising moral‑hazard and political risk. Hedging and selective exposure are therefore preferable to blanket directional bets.

Key Decisions for Investors

• Short Canada 5y sovereign futures (or buy 5y payers via futures) — horizon 1–3 months around geopolitical windows; target a 10–25bp adverse-yield move as stop; asymmetry: a further risk-premium repricing should be >2x the funded carry cost if conflict persists.
• Buy 6–12 month CAD payer swaptions (near‑ATM) to hedge BoC upside — horizon 3–9 months; limited premium cost but large payoff if policy tightens; breakeven if 2–3 policy moves materialize before expiry.
• Pair trade: long variable-rate–weighted originator (EQB.TO or HCG.TO) / short large diversified bank (RY.TO) — horizon 3–12 months; isolates origination/repricing benefit while shorting steady deposit franchises that suffer duration mark losses; size modestly and monitor NIM and credit indicators weekly.
• Buy CAD rate cap (short-term, 12 months) to protect mortgage book or client portfolios — horizon 6–12 months; conservative hedge alternative to swaptions with clearer payoff if short rates move sharply higher, accept cap premium as insurance expense.