# Ratellow's AI Mortgage Answer Engine: A Personal Research Hub for Canadians and the Pros Who Advise Them

> How Ratellow uses frontier AI models to turn the Canadian mortgage canon into instant, sourced answers — and how anyone can save scenarios, FAQs, and calculators to a free Personal Research Hub.

Category: Market Commentary & Outlook
Author: Ratellow Research Team
Published: 2026-05-29T20:00:00.000Z
Updated: 2026-06-02T01:00:00.000Z
Source: https://ratellow.com/blog/ratellow-ai-mortgage-research-hub

**What if Claude, ChatGPT, or Gemini actually understood Canadian mortgages?**

That's the question we built [Ratellow](https://ratellow.com) to answer. An AI answer engine that grounds frontier models in the primary sources of Canadian mortgage policy — OSFI, CMHC, the Bank of Canada, FCAC, and every major lender's policy pages. Every answer traceable back to the source. Built for the household trying to research their own situation, and the mortgage professional answering five versions of the same question every day.

This post is the full walkthrough — what Ratellow does, where AI fits in, and how the free Personal Research Hub lets anyone save the scenarios, FAQs, calculators, and answers that matter most.

## TL;DR

- **Ratellow is the AI answer engine for Canadian mortgages** — open at [ratellow.com](https://ratellow.com), no paywall on the answers themselves. We ground frontier AI models in the primary regulator and lender canon so every claim traces back to a source.
- **Three jobs for every answer**: read the canon (Bank of Canada, OSFI, CMHC, FCAC, lender policy pages), translate specialist language into plain English, cite the source. Answers without sources don't ship — citation discipline is the product.
- **You can save anything you ask, read, or run** — scenarios, FAQs, calculators, blog posts — into a free Personal Research Hub at `/bookmarks`.
- **Brokers and consumers use it differently**: brokers as a sanity check on edge cases + a client-facing reference; consumers as research before the broker conversation, with their own saved library.
- **What it is not**: personalized advice, a lender, a quote engine, or a lead-gen funnel. No commissions, no leads sold.

## The research problem in 2026

For a Canadian household, the mortgage research stack is unforgiving:

- The qualifying rate is set by OSFI, but lenders can apply it differently on renewals than on new originations.
- CMHC, Sagen, and Canada Guaranty each set their own premium grids — and the 30-year amortization rules that came in for first-time buyers in 2024 added a fresh layer.
- Provincial closing costs vary by an order of magnitude — a $500K home costs roughly $10,000 to close in Alberta and roughly $25,000+ to close in Toronto once land transfer tax and legal stack up. (See [Past the Down Payment: The 2026 First-Time Buyer Closing-Day Cash Event](/blog/2026-fthb-closing-day-cash-event-provincial) for the worked numbers.)
- The 2026 renewal wave puts millions of borrowers in front of a rate that is materially different from the one they signed at — and the math on switching versus staying isn't obvious without running it.

For a broker, the same complexity is a daily operating cost. Most of the questions a client asks have been answered before, by the broker, in a previous email — but reconstructing the answer, the math, and the source takes time.

Here's what that looks like day-to-day:

- **If you're a Canadian mortgage broker**, you've rewritten the same client explainer three times this week. Each one from scratch. Each one with the same OSFI links at the bottom.
- **If you're a first-time buyer in Canada**, you've spent an evening trying to figure out whether your FHSA, RRSP Home Buyers' Plan, and the new 30-year amortization actually stack — and given up halfway through.

Ratellow is built for both surfaces of that problem.

## How the answer engine works — at a high level

![The Ratellow homepage at desktop width in both light and dark mode — same content, the theme follows the reader's system preference. Both surfaces are first-class.](/images/blog/ai-answer-engine/blog-05-home-desktop-ld.png)

The core experience is the Ask surface. You type a question — *Should I lock in a 3-year fixed or wait?*, *What does the stress test actually require on a straight switch?*, *How does the FHSA stack with the RRSP Home Buyers' Plan?* — and you get back a structured, sourced answer.

We use **frontier AI models** to do three jobs:

1. **Read the canon.** The Bank of Canada's policy decisions and Monetary Policy Reports, OSFI Guideline B-20 and its updates, CMHC's underwriting standards, FCAC's renewal guidance, provincial land-transfer-tax rules, and the public-facing policy pages of major Canadian lenders. The corpus is what every well-informed broker would consult before answering — and the AI's job is to make sure the answer never drifts from it.
2. **Translate.** Most of the underlying material is written for professionals. The answer engine rewrites it into plain English without losing the technical precision that makes the answer correct.
3. **Cite.** Every meaningful claim links back to a primary source so you — or your broker — can verify it. Answers without sources don't ship.

We deliberately don't expose the underlying retrieval and model stack here. The point isn't which model. The point is that the answer you read is grounded, current, and traceable.

## Try a real question — on any device

![The Ask surface on mobile in both light and dark mode, with a prompt typed in. Same flow on a phone in the kitchen as on a desktop in the office — no second-class experience.](/images/blog/ai-answer-engine/blog-12-ask-typed-mobile-ld.png)

Most household research happens on a phone, between meetings or in the kitchen. The Ask surface is designed to work the same on mobile as on desktop — no missing features, no diluted answer, no dropped citations. Type your question. Get a sourced answer.

## Beyond Q&A: the Scenario Library

![A Ratellow scenario detail page on desktop in light and dark mode. Each scenario opens with a worked example, then a step-by-step framework. Save and Share controls sit at the top — anything worth keeping is one click away.](/images/blog/ai-answer-engine/blog-02-scenario-desktop-ld.png)

Not every research question is a one-off. Some are *situations* — *getting a mortgage when you're self-employed*, *switching from variable to fixed mid-term*, *financing a pre-construction condo between deposit and closing*.

For those, we ship the [Scenario Library](/scenarios): persona-by-situation worked examples, each one written like a senior broker walking a client through the path. Every scenario opens with a **worked example** (the actual dollar figures on a representative file), then a **3–4 step framework** (the decisions in order), then a list of common mistakes.

This is the part of Ratellow that brokers tend to bookmark first. The scenarios are not generic; they are the answer you'd write up if a client asked you cold.

A few high-value scenarios to start with:

- [Getting a Mortgage When You're Self-Employed in Canada](/scenarios/self-employed-mortgage-canada)
- [When to Start Shopping Your Mortgage Renewal](/scenarios/mortgage-renewal-shopping-timeline-canada)
- [Switching From Variable to Fixed Mid-Term — When It's Worth the Math](/scenarios/variable-to-fixed-switch-mid-term)
- [Refinancing to Fund Home Renovations — Your Options Compared](/scenarios/refinance-for-renovations-canada-options)

## From a question to deep research: the Guide stack

![The Ratellow guides index on desktop in light and dark mode — a categorized library of long-form research guides covering renewal, qualification, financing, and regulatory topics.](/images/blog/ai-answer-engine/blog-06-guides-desktop-ld.png)

A scenario is a worked example. A **guide** is the deep version — the research piece you read once and refer back to for months. The [Guides library](/guides) covers the 2026 Renewal cycle, OSFI stress-test mechanics, FHSA + HBP stacking, fixed-versus-variable strategy, GDS/TDS qualifying ratios, self-employed mortgages, and dozens of other situations every broker handles weekly.

![A long-form Ratellow guide on mobile in light and dark mode — full tables, worked numbers, and decision frameworks render the same on phone as on desktop. No mobile-only summary, no truncated content.](/images/blog/ai-answer-engine/blog-07-guide-mobile-ld.png)

Guides are written for both audiences in the same page — the institutional context a broker needs to sign off on the recommendation, and the plain-English summary a household needs to decide. The [2026 Canadian Mortgage Renewal Guide: 120–180 Day Rate Strategy & OSFI Rules Explained](/guides/renewal-180-day-window) is a strong entry point.

## Run the numbers: calculators built on the same canon

![Ratellow's Affordability Calculator — same OSFI-compliant qualification rules and provincial closing-cost data the lender's underwriter would use, surfaced in a worked report you can save.](/images/blog/ai-answer-engine/blog-09-affordability-desktop.png)

Research is one thing. Plugging your numbers in is another. Every Ratellow calculator — [affordability](/mortgages/affordability-calculator), payment, renewal payment-shock, land-transfer tax — runs the **same OSFI-compliant qualification rules** we cite in the guides. Change a province and the closing costs update; toggle a stress-test mode and the qualifying number moves with it. The math isn't a marketing approximation; it is the same math an underwriter would run.

For a broker doing a back-of-the-envelope on a client call, that means the number you read out is the number the lender will calculate when the file goes in.

## Save it all: the Personal Research Hub

![The Personal Research Hub sign-up modal on mobile in both light and dark mode — one free account, anything you save lives in a personal library that follows you between devices.](/images/blog/ai-answer-engine/blog-03-save-modal-mobile-ld.png)

A research tool you can't return to is a worse research tool. So on every scenario, FAQ, calculator, and article on Ratellow, there is a **Save** button.

Click Save (on any device, on the main `ratellow.com` domain — no special subdomain required) and you get prompted to create a free Personal Research Hub. Once signed in, anything you save lives at [ratellow.com/bookmarks](https://ratellow.com/bookmarks), filterable by type:

- **Scenarios** — for the worked examples you keep referring back to.
- **FAQs** — for the short-form answers (Ratellow currently ships nearly 300, across renewal, qualification, regulatory, strategy, and product topics).
- **Calculators** — affordability, payment, renewal payment-shock, land-transfer tax, with the inputs you ran last time still there.
- **Articles & guides** — long-form research like the [2026 Renewal Guide](/guides/renewal-180-day-window) or the [Fixed vs. Variable Strategy Guide](/guides/lock-in-fixed-vs-variable).
- **Custom collections** — bundle them however you want. A broker might keep one collection per recurring client situation; a household might keep one per decision they're working through.

The sign-up is the only gate, and it's there for a clean reason: your library lives on your account so it follows you between devices. No account, no library. With one, the hub is genuinely yours.

## What this looks like for the two audiences

**For mortgage professionals.** The use case we hear most is *sanity check, then share*. A broker pulls up a scenario like *Co-Signer vs Guarantor on a Canadian Mortgage* to make sure their explanation matches current OSFI and CMHC treatment, then sends the link to the client. The client lands on a sourced, plain-English page that doesn't oversell — and the broker keeps a curated collection of the scenarios they trust.

**For consumers.** The use case here is *research before the conversation*. Before sitting down with a broker, a borrower asks the questions they were afraid to ask, runs the calculators on their actual numbers, and saves a small library of the answers that map to their situation. They show up better-prepared, and the broker conversation gets a lot shorter.

## What we deliberately don't do

A few things to be clear about, because the AI-in-finance space has earned the skepticism:

- **No personalized advice.** Ratellow is a research surface. It tells you what the rules are and what a representative file looks like; it does not tell you what to do with your specific file. That conversation belongs with a licensed broker or your bank.
- **No lender relationships, no commissions.** We don't sell leads and we don't sell a quote.
- **No black-box answers.** If an answer isn't sourced, it doesn't ship. The citation discipline is the product.

## Bottom line

The Canadian mortgage canon — regulation, lender policy, provincial rules, current pricing — already exists. The friction has always been that turning it into the answer to *your* question takes time, and the language is unforgiving.

Ratellow is the layer that does that work. Open the [Ask page](https://ratellow.com/ask), type the question you actually want answered, and follow the citations. When something is worth keeping, save it. Over time, what you save becomes a personal research library that maps to the decisions in front of you.

For mortgage pros — the same library, used as a sanity check and a client-facing reference, takes a real amount of work off the desk.

The answers are open. The hub is free. Start with a question.

## Sources
- Guideline B-20: Residential Mortgage Underwriting Practices and Procedures — https://www.osfi-bsif.gc.ca/en/guidance/guidance-library/residential-mortgage-underwriting-practices-procedures-guideline-b-20
- Monetary Policy at the Bank of Canada — https://www.bankofcanada.ca/core-functions/monetary-policy/
- CMHC Mortgage Loan Insurance — https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/mortgage-loan-insurance/cmhc-mortgage-loan-insurance-cost
- Renewing your mortgage — https://www.canada.ca/en/financial-consumer-agency/services/mortgages/renew-mortgage.html
- Ratellow — AI-powered mortgage research for Canadians — https://ratellow.com