Why Your Pre-Approval Isn't a Guarantee (And What to Do About It)

Getting pre-approved for a mortgage feels like crossing a major finish line. The bank looked at your income, your debts, your credit score, and your down payment, and they said yes. You have a number. You know what you can spend. You're ready to buy.

Except a pre-approval is not a mortgage. It's closer to a conditional handshake — the lender is telling you that based on the information you've provided, they're likely to lend you money for a home purchase up to a certain amount. The word "likely" is doing a lot of work in that sentence.

Understanding what a pre-approval actually is — and what can cause it to fall apart — is one of the most important things a buyer can know before they start shopping seriously.

What a Pre-Approval Actually Is

A mortgage pre-approval is an assessment of your borrowing capacity based on your current financial snapshot. The lender reviews your income, employment status, credit history, existing debts, and the size of your down payment, and they calculate the maximum amount they're willing to lend you under current conditions.

Most pre-approvals in Canada also include a rate hold — typically 90 to 120 days — which locks in the interest rate at the time of pre-approval even if rates rise before you complete your purchase. That's genuinely valuable, and it's one of the main reasons to get pre-approved before you start shopping seriously.

But a pre-approval is based on a snapshot of your finances at a specific moment in time. It is not a promise. The actual mortgage approval — the one that releases funds — happens after you have a firm offer on a specific property, and it involves a full review of both your finances and the property itself. A lot can change between pre-approval and final approval, and some of those changes can put your financing at risk.

What Can Go Wrong Between Pre-Approval and Final Approval

Your financial situation changes. This is the most common reason pre-approvals don't convert to mortgages smoothly. If your income changes — you switch jobs, go from salaried to contract work, take a leave, or are laid off — the lender will re-evaluate your application based on the new reality. Even a change that feels minor, like moving from permanent to probationary employment, can affect your approval.

Your credit changes. Between pre-approval and final approval, lenders often do a second credit check. If your credit score has dropped — because you applied for new credit, missed a payment, or increased your credit utilization — your approval terms may change, or your approval may be conditional on different terms than originally offered.

You take on new debt. This one catches buyers off guard more than almost anything else. Buying a car, financing new furniture for the home you haven't bought yet, opening a new credit card, or even co-signing a loan for someone else — all of these change your debt-to-income ratio, which is central to how lenders calculate what you can borrow. It doesn't matter that you're planning to pay it off quickly. What matters is that the debt exists at the time of your final approval.

The property doesn't appraise. Your pre-approval is for a borrowing amount, not for a specific property. When you have a firm offer accepted, the lender will order an appraisal to confirm the property is worth what you're paying for it. If the appraisal comes in below the purchase price — which can happen in competitive markets where buyers sometimes overbid significantly — the lender will only finance based on the appraised value. You'll need to make up the difference in cash, renegotiate the purchase price, or walk away.

The property has issues. Lenders are not just evaluating you — they're evaluating their security. If the property has certain characteristics (unpermitted additions, title issues, environmental concerns, or structural problems flagged in an inspection) the lender may decline to finance it, reduce the amount they'll lend, or require conditions to be met before advancing funds.

Conditions on your pre-approval aren't met. Many pre-approvals include conditions — income verification documents, a letter from your employer, proof of down payment funds being in your account for a certain period. If those conditions aren't satisfied to the lender's standards, the approval doesn't proceed.

The Stress Test: What It Means and Why It Matters

Since 2018, all federally regulated lenders in Canada have been required to qualify buyers at a stress test rate — currently the higher of the Bank of Canada's benchmark rate or your contracted rate plus two percentage points. This means you're qualifying for more than you'll actually pay, to ensure you could still carry the mortgage if rates rise.

The stress test affects how much you're pre-approved for, and it means your pre-approved amount is almost always lower than the purchase price you might assume you can afford based on your income alone. It also means that if rates rise between your pre-approval and your final approval, the stress test rate rises with them — potentially reducing your qualification amount.

What Not to Do Between Pre-Approval and Closing

This list is worth treating as a strict set of rules, not suggestions:

• Don't buy a car. Or a boat. Or a motorcycle. Or finance anything large.
• Don't open new credit cards or apply for any new credit at all.
• Don't change jobs if you can avoid it. If a job change is unavoidable, tell your mortgage broker immediately — some employment situations are manageable, but surprises are not.
• Don't make large cash deposits without documentation. Lenders will ask about unusual deposits as part of verifying your down payment, and unexplained cash raises flags.
• Don't co-sign anything for anyone.
• Don't spend your down payment. This sounds obvious, but buyers sometimes dip into their down payment savings for moving costs, furniture, or pre-possession expenses — and then discover they're short at closing.

The window between pre-approval and closing is not the time to make major financial moves. Keep everything as stable as possible until the keys are in your hand.

Work With a Mortgage Broker, Not Just Your Bank

One of the most practical things a buyer can do is work with an independent mortgage broker rather than going directly to a single bank. A broker has access to multiple lenders and can shop your application across them — which means if one lender has concerns, another may not. It also means you're getting professional advice on which product actually suits your situation rather than whichever product a single institution happens to offer.

This matters especially if your situation is anything other than completely straightforward — self-employed income, variable or commission-based pay, a recent job change, a lower credit score, a gifted down payment, or a property type that some lenders are less comfortable with.

Your REALTOR® can typically recommend mortgage brokers they've worked with and trust. That referral relationship matters — a broker who regularly works with agents in your market understands the local transaction timeline and will prioritize your file accordingly.

The Bottom Line

A pre-approval is a strong signal that you're a viable buyer, and it's an essential step before you start making offers seriously. But it's a starting point, not a guarantee. Treat it as a conditional yes, keep your finances stable and unchanged until closing, and work with professionals who can flag issues before they become problems.

The buyers who run into financing surprises at the last minute are almost never victims of bad luck. They're usually victims of things that were completely within their control to avoid.

MaxWell Realty Canada is a real estate franchise company with offices across Alberta, BC, Manitoba, Ontario, and New Brunswick. This article is intended for general informational purposes and does not constitute legal, financial, or mortgage advice. Always work with a licensed REALTOR® and qualified mortgage professional in your area.