Research Desk

Ratellow Research Team

The Ratellow Research Team is the institutional research desk behind Ratellow — a group of researchers, editors, and domain specialists who translate OSFI, CMHC, Bank of Canada, and Department of Finance Canada primary sources into the verified Mortgage Canon that powers every answer, guide, FAQ, and briefing on Ratellow.

Verified guides
70
FAQ entries
298
Primary sources
OSFI · CMHC · BoC · DoF
Review cadence
Continuous

Editorial standards

Every piece published under the Ratellow Research Team byline follows the same pipeline as the Ratellow Answer Engine: retrieval over our verified Mortgage Canon, drafting, and an editorial audit against primary sources — OSFI, CMHC, the Bank of Canada, and the Department of Finance Canada. Nothing ships without a verification date and explicit citations.

We do not publish individual author bylines because every piece is a product of this pipeline — not a single contributor. This matches how institutional research desks at banks and rating agencies attribute their work.

Corrections and updates are issued whenever a regulatory primary source changes — for example, the November 2024 OSFI straight-switch rule or the December 2024 increase of the CMHC insurable maximum to $1.5M. See our About page for the broader Ratellow editorial charter.

Primary sources we cite

Every numeric claim published under this byline traces to one of these regulators or rate-setting bodies — not to comparison-site copy.

OSFI
Guideline B-20 underwriting rules and the federally mandated stress test.
Bank of Canada
Policy Rate decisions, Prime transmission, and 5-year GoC bond yields.
CMHC
Insured-mortgage rules, insurable maximums, and default-insurance pricing.
Sagen · Canada Guaranty
Private default-insurance pricing and eligibility for both insurers.
Department of Finance Canada
Federal mortgage policy. Budget-tabled HBP, FHSA, and LTT cap changes.
CRA
Tax treatment of mortgage interest, plus FHSA and HBP repayment schedules.
CREA · Statistics Canada
National and regional housing-market data and MLS HPI benchmarks.
Provincial authorities
Land-transfer tax rates, first-time buyer rebates, and rent controls.

Correction policy

Material corrections are not silent. When OSFI, CMHC, the Bank of Canada, or another primary source changes a rule or figure, we re-verify the affected pages and stamp a new lastVerified date.

Report an error to research@ratellow.com. We check the claim against the primary source and update the page when it does not hold.

Recent research guides

All guides →
Refinance

2026 Canadian Mortgage Refinance Guide: Costs & Break-Even Math

The 2026 guide to refinancing a mortgage in Canada: what it actually costs (prepayment penalties, IRD vs. three months' interest, legal and appraisal fees), the OSFI stress test and 80% LTV cap, the 90% CMHC secondary-suite refinance, refinance vs. renewal, and the break-even math that shows whether it's worth it.

Verified Research
Investor

BRRRR Mortgage Rules Canada 2026: OSFI B-20, CMHC & Refinance Strategy for Investors

Master the BRRRR (Buy, Rehab, Rent, Refinance, Repeat) strategy under Canada's 2026 mortgage rules. This guide covers OSFI Guideline B-20 stress test requirements, CMHC mortgage insurance eligibility, 30-year amortization access for investors, rental income qualification rules, and maximum loan-to-value (LTV) limits for refinancing — everything Canadian real estate investors need to execute the BRRRR cycle successfully.

Verified Research
Renewal

2026 Guide: Variable Mortgage Trigger Points & Trigger Rates in Canada

Discover how variable-rate mortgage trigger points and trigger rates work in Canada in 2026. Learn the difference between a trigger rate (when your payment no longer covers interest) and a trigger event (when your lender requires action), with real numeric examples, OSFI rule context, and renewal strategies for homeowners facing rising prime rates.

Verified Research
Renewal

1 and 2 Year Fixed Mortgage Terms: Smart Renewal Strategies for Canadians in 2026

Millions of Canadians are renewing their mortgages in 2025–2026, many for the first time at significantly higher rates. This guide explains why a 1- or 2-year fixed mortgage term may be the smartest strategic choice for 2026 renewals — offering flexibility to benefit from potential rate cuts without locking in long-term. We cover the November 21, 2024 stress test exemption for uninsured borrowers switching lenders, the key differences between CMHC-insured and uninsured renewal eligibility, a rate comparison across short and long terms, and actionable steps to help you shop confidently and manage your payments.

Verified Research
Strategy

Fixed vs. Variable Mortgage Canada: 25-Year Rate Comparison & 2026 Guide

Should you lock in a fixed rate or ride the variable wave? This in-depth guide compares fixed vs. variable mortgage rates in Canada over 25 years, updated for 2026 market conditions. Explore historical rate trends, the latest Bank of Canada (BoC) prime rate, current stress test rules, CMHC (Canada Mortgage and Housing Corporation) insurance thresholds, and expert tips for first-time buyers — so you can make a confident, informed mortgage decision.

Verified Research
Strategy

Financing Garden Suites & Multi-Generational Co-Buying in Canada (2026 Guide)

Discover how Canadian families can finance garden suites and co-buy homes in 2026. This guide covers updated CMHC (Canada Mortgage and Housing Corporation) insurance limits, accessory dwelling unit (ADU) construction financing, co-ownership legal structures, and how projected rental income can boost your borrowing power — all explained in plain language for homeowners and mortgage professionals.

Verified Research

Recent briefings

All briefings →

Areas of coverage

  • OSFI Guideline B-20 and the mortgage stress test
  • CMHC, Sagen, and Canada Guaranty insurance rules
  • Bank of Canada policy rate transmission to Prime
  • Mortgage renewal mechanics and the 2025–27 renewal cliff
  • Refinance break-even math and IRD penalties
  • First-time buyer programs (HBP, FHSA, LTT rebates)
  • Readvanceable mortgages, HELOCs, and collateral charges
  • Fixed vs. variable strategy under the current rate path