Canada's mortgage stress test (OSFI's Guideline B-20), explained

Our US ATR/QM explainer covers the federal requirement that a US creditor make a documented, good-faith determination a borrower can actually repay a mortgage. Canada has no identical statute, but it has a functionally related idea, built and enforced very differently: a federal banking regulator's guideline requiring certain lenders to qualify a borrower against a higher, hypothetical interest rate than the one on their actual loan.

What the stress test actually requires

Under the Office of the Superintendent of Financial Institutions' Guideline B-20, a federally regulated financial institution (FRFI) — meaning a bank chartered under the federal Bank Act, not every mortgage lender in Canada — has to qualify a mortgage borrower using a minimum qualifying rate (MQR), not simply the contract rate the borrower will actually pay. As of 2026, the MQR is the greater of the borrower's actual contract rate plus 2 percentage points, or a fixed 5.25% floor. Whichever of the two produces the higher number is the one that actually applies: the 5.25% floor only binds when a contract rate is low enough that adding 2 points still lands under it (below roughly 3.25%); at today's typical contract rates, well above that level, the contract-plus-2% test is the one actually doing the qualifying — a borrower offered a 4.5% rate, for example, has to qualify as if the rate were 6.5%, not 5.25%.

Not a comment on any lender's rates — a qualification math requirement

This page describes a regulatory qualifying calculation, not any assessment of which lender offers the best rate or product — see the permanent scope note at the bottom of this page. The stress test doesn't change the interest rate a borrower actually pays; it changes the income and debt-load math a lender is required to run before approving the loan, specifically to confirm the borrower could still make payments if rates were meaningfully higher than what they're actually being offered.

How this rule arrived, in two stages

The federal government first applied a stress test to insured mortgages — those with a down payment under 20%, requiring mortgage default insurance — starting October 2016. OSFI extended a parallel stress test to uninsured mortgages (a 20%-or-more down payment) at FRFIs starting January 2018, closing what had been a gap where a larger down payment let a borrower skip the stricter qualifying math entirely. OSFI reaffirmed the current MQR formula unchanged as recently as January 2026.

Who the stress test doesn't reach

Because Guideline B-20 is an OSFI guideline, it only binds institutions OSFI actually supervises — federally chartered banks. A provincially regulated credit union, or a private lender arranging a mortgage outside the federally regulated banking system, is not itself bound by B-20, though a given credit union may voluntarily apply a similar standard, or be subject to a comparable requirement under its own provincial regulator's rules instead. A borrower who doesn't qualify at a federally regulated bank because of the stress test may still be able to qualify with a provincially regulated lender using different criteria — a real, structural gap in the rule, not a loophole specific to any one lender.

A 2024 carve-out: switching lenders at renewal

Effective November 21, 2024, OSFI removed the stress-test requirement specifically for a borrower with an existing uninsured mortgage who switches to a different federally regulated lender at renewal, without increasing the amount borrowed — a narrow exception aimed at a borrower simply shopping for a better rate at renewal, distinct from a borrower increasing their loan amount or qualifying for a new mortgage entirely, both of which still go through the full stress test.

What this page is, and isn't: an explanation of a real federal prudential qualifying-rate requirement, for general understanding — not a comparison of specific lenders' rates, underwriting standards, or approval odds, and not part of our published standard or Register, both of which remain United States-only. This site never ranks or grades a lender's rates or products; see our permanent scope note on the standard page.

What to actually check

If you're working out what you can qualify for, ask directly whether the lender you're applying with is a federally regulated bank subject to B-20, or a provincially regulated credit union or private lender that may use different qualifying math — and confirm the current MQR figure and floor directly with OSFI's own published guidance rather than an older, potentially outdated number.