What does OSFI's Guideline B-20 actually say about mortgage underwriting — and where does the official record stop? This episode runs an official-record audit on three things borrowers hear quoted constantly: renewal switches, the stress-test formula, and amortization at renewal. Using only retrieved primary OSFI and CMHC sources, we separate three layers: what the official record establishes, what falls to lender underwriting, and what is illustration. The B-20 consultation summary and the infosheet set out principles — capacity to service debt, conservative GDS and TDS, an interest rate above the contractual rate. They do not establish the twenty twenty-four straight-switch exemption, the Minimum Qualifying Rate formula, insured-file renewal-switch treatment, or a renewal amortization increase. Secondary coverage from Ratehub and The Globe and Mail describes a twenty twenty-four OSFI change. That's commentary, not the official rule, and we say so. We also work through a plain amortization illustration: a four hundred eighty thousand dollar balance renewing at four point five percent over twenty-five years versus thirty, plus what a lower appraisal does to available equity room. The takeaway is practical. Ask which document. Keep official rules, lender policy, and illustration in separate buckets. Get the requalification question answered in writing. Educational content only, not financial, legal, or tax advice. Your Mortgage Minute. Keywords OSFI B-20, mortgage underwriting, renewal switch, stress test, Minimum Qualifying Rate, amortization, mortgage renewal, CMHC, lender underwriting, Canadian mortgage, GDS TDS, official record Send us Fan Mail About Your Mortgage Minute: Your Mortgage Minute delivers straight-talk mortgage education for Canadians navigating the 2026 rate environment. Each episode breaks down one practical topic with real math, real examples, and actionable strategies—no fluff, no sales pitch, just insights you can use. Useful links: 👉 [BOOK A FREE 30-MINUTE CONSULTATION] Speak directly with an expert to run your numbers. https://onlendhub.ca/book-a-call 🚀 [APPLY ONLINE IN MINUTES] Skip the paperwork and start your mortgage strategy securely from your phone or computer. https://onlendhub.ca/apply-now/ Disclaimer: This podcast provides educational information only and does not constitute financial advice. Mortgage terms, rates, and regulations vary by lender and individual circumstances. Consult with a licensed mortgage professional before making financing decisions. AI has been used in the production of this podcast.
