Can You Rely on ChatGPT or Another AI for Your Mortgage?
An AI can help prepare your questions, but it knows neither your file nor today's rate: limits, checks and reliable tools.
In this article
You can use a conversational AI to understand mortgage vocabulary and prepare your questions, but not to decide on an amount, a rate or eligibility. A general-purpose tool cannot see your credit file, your income or the property, and its answers may rest on outdated data. Rates and rules change, and final approval belongs to the lender. Check any figure an AI provides against an official source, such as the Financial Consumer Agency of Canada (FCAC), the Autorité des marchés financiers (AMF), a lender or a broker. Used well, an AI helps you prepare. Used poorly, it gives a false sense of certainty about a decision that shapes a household budget for years.
What an AI does well
An AI can explain terms such as amortization, term, fixed rate or variable rate. It can rephrase a difficult text and suggest a list of questions for the lender. It can also help organize the documents to gather or compare the merits of an approach in general terms. Used this way, it serves as preparation, like a guide. It replaces neither a lender, nor a broker, nor a notary. Treat every answer as a research lead, not an established fact. It is especially useful for demystifying intimidating vocabulary and for helping you phrase questions you might not have thought to ask. Once the list is drawn up, the meeting with a professional provides the reliable answers, suited to your situation.
Why its numbers can be wrong
Three limits recur. First, the data: a model may rely on older information while rates, programs and rules change. Second, the context: the AI does not know your credit score, debts, income, down payment or the type of property. Third, the phrasing: an answer can sound confident even when it is inaccurate or incomplete. No rate obtained from an AI is an offer. Only a lender can offer you a rate, after reviewing your file. The tone of the answer stays the same whether it is right or wrong, and nothing in the form warns you that the substance is doubtful. If an item matters to your decision, treat it as unconfirmed until an official source says the same thing.
What to verify, and with whom
For general rules, such as the minimum down payment or preapproval, consult the FCAC pages. For professional conduct, licences and recourse in Quebec, consult the AMF. For a rate, an amount or eligibility, speak to a lender or broker and ask for the answer in writing. According to the FCAC, a lender may hold a rate for 60 to 130 days depending on the case, but a preapproval does not guarantee final approval. Always compare what you receive with at least one official source. Note, beside each check, the source you consulted and the date. This small log saves you from repeating the work and lets you show the broker where your assumptions come from.
Personal data: be careful
Avoid entering your social insurance number, account numbers, full addresses or copies of identity documents into a consumer AI tool. Describe a general case instead, with rounded or fictional amounts. Read the tool's privacy policy to learn whether your conversations are kept. A lender or broker has confidentiality obligations that a general-purpose tool does not necessarily meet. A simple description of the scenario is usually enough to get a useful explanation, and it keeps the details that identify you out of a tool whose retention practices you may not fully know.
More reliable tools for calculations
To estimate a payment or a down payment, a calculator with a published formula is more reliable than a generated answer. QuebecTaux calculators rely on formulas documented in the methodology, and their results are provided for information only, neither an approval nor a rate offer. Enter your own assumptions, test several scenarios and bring the results to the meeting with the lender or broker. If an AI and a calculator disagree, check the inputs before deciding which to believe. A calculator is also transparent: you see what you entered and can correct an assumption without rewording a whole conversation.
Quebec scenario: preparing a meeting with the broker
A couple in Gatineau asks an AI to explain the difference between a fixed and a variable rate, then to list the documents a lender usually requests. They use it to draft a list of questions. The AI also offers a reference rate, but the couple does not keep it, since they do not know its date or origin. Instead they read the FCAC page on down payments, test their assumptions in a calculator and ask the broker for a written rate suited to their file. The amounts used in the discussion are assumptions to replace with the household's own.
Checklist
- Use the AI to understand vocabulary, not to decide
- Never treat an AI-generated rate as an offer
- Verify every figure with the FCAC, the AMF or the lender
- Check the date of any information cited
- Do not enter identity or account numbers into the tool
- Run calculations in a calculator with a published formula
- Prepare a list of questions for the broker
- Ask for terms and rate in writing
- Have a lender confirm eligibility
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