Canada's 5-year government bond yield has climbed approximately 35 to 40 basis points since the Iran conflict began in late February, according to rate tracking by Mortgage Sandbox and True North Mortgage. On Tuesday, the Canada 10-year yield reached 3.74%, a two-year high, as the global bond selloff intensified with the US 30-year Treasury yield touching 5.2%. For the roughly one million Canadian homeowners renewing mortgages this year, that yield move is not an abstract market event. It is landing in their mortgage statements.
The best available 5-year fixed mortgage rates now range from 4.0% to 4.6% depending on lender and insured status, compared to pandemic-era rates of 1.5% to 2.0% that many borrowers locked in during 2021. Desjardins macro strategist Tiago Figueiredo has estimated that five-year fixed-rate borrowers renewing this year face monthly payment increases of roughly 20%, while five-year variable-rate borrowers with fixed payments could see increases near 40%. For a household carrying a $500,000 mortgage balance, a 20% payment increase translates to several hundred dollars per month in additional after-tax cash outflow.
The chart above shows the Canada 5-year government bond yield from January 2024 through May 2026, against the best available 5-year fixed insured mortgage rate, illustrating the direct mechanical relationship between the two and the sharp repricing since the Iran conflict began on February 28, 2026.
The GoC 5-year bond yield drives fixed mortgage rate pricing with a lag of days; the 35 to 40 basis point rise since the Hormuz closure has pushed best available 5-year fixed insured rates from near 3.7% to the 4.0% to 4.6% range, reversing the brief relief borrowers had hoped to carry into 2026 renewals.
The Asset Location Problem This Creates
The bond selloff has a second-order planning implication that is less visible than the mortgage payment increase but potentially more consequential over five years. When bond yields rise, the attractiveness of holding fixed income inside a non-registered account increases in one respect (higher current yield) and worsens in another (interest income is fully taxable). The tax efficiency question that mattered less when GIC rates were 1.5% now matters considerably when GIC rates are tracking toward 4.0% to 4.5% for 5-year terms.
The standard asset location guidance remains intact: interest-bearing fixed income belongs inside an RRSP or TFSA wherever possible, because interest income is taxed as ordinary income at marginal rates, while capital gains are taxed at inclusion rates and Canadian-eligible dividends receive the dividend tax credit. A client in a 46% marginal tax bracket earning 4.2% on a GIC inside a non-registered account keeps roughly 2.3% after tax. Inside a TFSA, they keep 4.2%. Inside an RRSP, they keep 4.2% on a deferred basis, reducing the current year's taxable income by the contribution amount.
What the Hormuz-driven rate environment changes is the urgency of acting on that guidance. At 1.5% GIC rates, the difference between registered and non-registered held a GIC was worth roughly 0.8% after tax per year for a top-bracket investor. At 4.2% rates, the same spread is worth roughly 1.9% per year. On a $100,000 fixed income position, that is the difference between $800 per year and $1,900 per year in tax leakage. Over five years compounded, the after-tax shortfall from poor asset location roughly triples.
How Mortgage Renewal Intersects with TFSA and RRSP Decisions
The planning conversation becomes sharper when the client facing a 20% to 40% mortgage payment increase is also sitting on TFSA or RRSP contribution room they have not used. These are not separate decisions. Every dollar deployed into a registered account reduces the pool available for increased mortgage payments, while every dollar left in a savings account earning taxable interest compounds the tax leakage problem identified above.
The RRSP limit for 2026 is $33,810, and the TFSA annual limit is $7,000 with a cumulative maximum of $109,000 for those eligible since 2009, according to TD Canada Trust and WealthNorth. Clients who have deferred registered contributions in recent years while carrying mortgage debt at sub-2% rates were making a reasonable decision then. At 4.0% to 4.6% mortgage rates, the calculus changes, but not uniformly. An RRSP contribution still makes sense when the tax refund it generates can be applied toward the renewal payment increase. A TFSA contribution makes sense for clients who want to preserve flexibility, since TFSA withdrawals do not trigger income-tested benefit clawbacks and the room is restored in the following calendar year.
The FHSA remains available for eligible clients: up to $8,000 annually with a $40,000 lifetime limit, contributions are tax-deductible and qualifying first-home withdrawals are tax-free. For clients who are renters watching mortgage rates move against their purchase timeline, this week's yield moves change the FHSA deployment calculus as well. Locking more into the FHSA at current GIC rates of 4.0% to 4.2% while waiting for fixed mortgage rates to stabilize is a strategy worth modelling explicitly.