Finance

Mortgage Pre-Approval: The Limits

By Georges Matar · July 6, 2026 · 6 min read

Plenty of buyers treat a pre-approval as a finish line. You get a number, you start visiting, and you assume the financing is settled. It works the other way around: a pre-approval is the opening of the file, not its conclusion.

Here is what it actually is, what it does not cover, and what makes it fall apart. I am a real estate broker, not a lender. This is general information drawn from the public sources named in the text.

What FCAC actually says

According to the Financial Consumer Agency of Canada, a pre-approval does two things: it tells you the maximum mortgage amount you could qualify for, and it lets you estimate your payments. It also lets you lock in an interest rate.

And the agency adds a sentence that should be printed in bold on every pre-approval letter: this process does not guarantee your approval for a mortgage.

In plain terms, it is a conditional commitment based on the information you provided, at one moment in time, before any property has even been identified.

The validity window, and why it matters

FCAC states that a pre-approval lets you lock in an interest rate for 60 to 130 days, depending on the lender. That is a window, not forever.

For a sense of market pace: in the Montreal census metropolitan area in August 2026, the average selling time for a single-family home was 42 days, according to QPAREB. A serious search, a few rejected offers and a closing delay can easily run past your rate window.

Two moves: put the expiry date in your calendar, and ask your lender whether you automatically get the lowest rate if rates drop while you are pre-approved. FCAC explicitly recommends asking that question.

If the search runs long, renew the pre-approval before it lapses rather than after. An expired file has to be rebuilt with fresh documents, and it is rebuilt against the rates and the rules of that day, not the ones you started with.

Pre-approval and final approval are two different steps

A pre-approval is about you. A final approval is about you and one specific property.

That distinction is the expensive one to miss. FCAC is direct about it: the lender will verify that the property you want meets certain standards, and it can refuse the loan even after pre-approving you. It can also propose something else: a lower amount, a higher rate, a larger down payment, or a co-signer.

A condo building with a thin contingency fund, a property with major work announced, an unusual zoning: the file can stall right there, with a perfect buyer attached to it.

The appraisal that stops everything

A lender does not lend against the price you agreed to pay. It lends against the value it recognizes for the property.

If the appraisal comes in below the purchase price, the gap does not disappear. It becomes cash you have to find, on top of the down payment you already planned. In a bidding war market, that is the most underestimated risk in the transaction. Deal with the question before you write an offer, not after.

This is also why the financing condition in a promise to purchase deserves care. It gives you a delay to obtain a firm answer from the lender on that specific property. Dropping the condition to make an offer more attractive, while the financing is not confirmed, means carrying the risk of a refusal alone. Discuss it with your broker before signing, not during the delay.

The numbers behind your number

Three public rules frame the calculation, and knowing them prevents bad surprises.

Debt service ratios. CMHC caps an insured loan at 39% gross debt service, meaning principal, interest, taxes and heat against gross income, and 44% total debt service, which adds your other debts. FCAC uses the same thresholds.
The stress test. OSFI sets a minimum qualifying rate for uninsured mortgages: the greater of the contract rate plus 2% or 5.25%. You do not borrow at that rate, you have to show you could carry it.
Credit and down payment. For a CMHC insured loan, at least one borrower or guarantor needs a credit score of at least 600. On the down payment, under federal rules, as explained by FCAC, the minimum is 5% up to $500,000, then 10% on the portion above that, and 20% from $1.5 million.

Run your own figures through the affordability calculator before you meet anyone.

What makes a pre-approval collapse

The lender re-verifies your situation before the money moves. Anything that changed since you applied can reopen the file.

Changing jobs. Even for better pay. A probation period or a move to self-employment changes how your income reads.
Buying a car. A new monthly payment lands straight in your total debt service ratio.
Adding debt. Credit card, line of credit, financed furniture, personal loan: same logic.
A late payment. Payment history sits at the centre of your credit file.
Moving large sums around. The lender has to trace where your down payment came from.

The rule is simple: between pre-approval and the keys, no major financial moves.

The credit check, without the myths

FCAC puts it plainly: when you apply for a pre-approval, the lender likely runs a credit check. Hard inquiries appear on your credit report and they affect your credit score, unlike the soft inquiries you make yourself, which do not.

The agency recommends applying for credit only when you need it and avoiding multiple applications at once or too close together, because too many inquiries close together may make lenders think you are urgently seeking credit. Shopping your mortgage is not a fault, but do it in a short, deliberate stretch rather than spread over months. For the rest, see what your credit score actually changes.

The pre-approved amount is not your budget

It is a ceiling built from ratios, not a life goal. It ignores your plans, your emergency cushion and a good share of the real costs: municipal and school taxes, condo fees, insurance, maintenance, and the amounts due at the notary.

Estimate them with the closing costs calculator and the list of hidden homeownership costs. A buyer who uses 100% of the ceiling also buys permanent stress.

Build the file before you apply

FCAC lists what the lender will ask for: identification, proof of employment, proof of your down payment and closing cost funds, information about your other assets, and information about your debts and financial obligations.

Gather all of it before the first meeting. A clean file does not win you a better rate on its own, but it prevents the back and forth and the last minute surprises. On the rate itself, see what gets decided before the rate, and for the wider view, the first-time buyer mortgage guide.

Five questions for your lender

Exactly what date do my pre-approval and my rate hold until?
If rates drop before then, do I get the lower rate?
Which conditions remain to be cleared for a final approval?
What kind of property could be a problem in my case?
What happens if the appraisal comes in below the purchase price?

The answers in writing are worth more than an impressive number on a letter.

Planning a purchase in Greater Montreal and want your file checked before you write an offer? Reach out and we will look at your situation together.