BMO has brought back stress-test qualification for some uninsured mortgage switches in Canada, which means a borrower who wants to move an existing uninsured mortgage to BMO may need to prove they qualify at a higher test rate, not only at the offered contract rate. This matters most at renewal, when homeowners often shop for a better rate without increasing their loan amount. The practical takeaway is simple: before switching lenders, ask whether the new lender will treat the file as a straight switch, a refinance, or a newly underwritten mortgage.

What changed

For Canadian borrowers, the key issue is not whether the mortgage is fixed or variable. It is whether the switch is uninsured and whether the lender requires a new stress-test assessment.

An uninsured mortgage usually means the borrower has at least 20 per cent equity and does not have mortgage default insurance. A switch, sometimes called a transfer, usually means moving the mortgage from one lender to another at renewal without increasing the principal, extending the amortization beyond what remains, or adding new borrowing.

OSFI’s B-20 guideline governs federally regulated lenders and sets expectations for residential mortgage underwriting, including minimum qualifying-rate rules (OSFI, 2026). If a lender applies the stress test, the borrower may need to qualify at the greater of the contract rate plus a buffer or a prescribed floor. That can reduce how much debt the lender is willing to carry, even when the borrower has made all payments on time.

Why this matters at renewal

The Canadian mortgage system is built around terms and amortization. Your term might be 1, 3, or 5 years, while your amortization is the longer payoff schedule, often 25 or 30 years. At the end of a term, you can renew with your current lender, switch to another lender, or refinance.

The Financial Consumer Agency of Canada explains that renewing or changing a mortgage can involve comparing rates, reviewing prepayment terms, and understanding fees or penalties (FCAC, 2026). If a new lender applies a stress test to an uninsured switch, some borrowers may find that staying with their current lender is easier, even if another lender advertises a lower rate.

That does not mean switching is impossible. It means the approval gate may be tighter, especially for borrowers whose income has changed, debt has increased, or amortization is already stretched.

Read also: OSFI’s Stress Test Change for Uninsured Mortgage Switches in Canada

How to check your own situation

First, confirm whether your mortgage is insured or uninsured. A mortgage with less than 20 per cent down at purchase usually required mortgage default insurance, while a mortgage with 20 per cent or more down is often uninsured.

Second, ask the lender or broker how the application will be classified. A straight switch is different from refinancing. If you increase the loan amount, consolidate debt, add a HELOC, or reset the amortization, the lender will usually treat it as a refinance.

Third, compare the full cost, not only the rate. Look at discharge fees, appraisal fees, legal fees, title insurance, prepayment penalties, and whether the old lender has an interest rate differential calculation on a fixed-rate closed mortgage.

Finally, remember that rates are tied to broader market conditions. The Bank of Canada’s policy rate influences variable rates and lender funding conditions, but mortgage pricing also depends on lender competition and bond yields (Bank of Canada, 2026). As of July 2026, rates change frequently, so verify current terms with a licensed mortgage professional before deciding.

Bottom line

BMO’s move is a reminder that switching lenders at renewal is not always a simple rate-shopping exercise. For uninsured borrowers, the stress test can affect whether a new lender will approve the transfer, even when the mortgage balance is not increasing.

This article is general educational information only, not personalized financial, lending, legal, or tax advice, and not an offer or commitment to lend. Mortgage rules, the OSFI stress test, mortgage default insurance, land transfer tax, and available programs vary by province or territory, lender, product, and personal circumstances. Confirm your options with a licensed mortgage broker, your financial institution, the FCAC, or a qualified tax professional for your situation.