Mortgage Pre-Approval in Canada: What It Locks In, and What It Does Not

A mortgage pre-approval is a lender's conditional decision on how much it will lend you, based on documents it has actually seen, combined with a rate hold for a fixed number of days. It is not a mortgage. It is a written opinion about you, issued before anyone has looked at the property you eventually buy.

That distinction is where most of the pain lives. Buyers treat the number as a guarantee, waive their financing condition, and then find out that the lender still has to appraise the house, review the status certificate on a condo, re-verify employment on the week of closing, and re-pull credit. Any one of those can change the answer. Meanwhile the pre-approval quietly ages out while a search drags on for five months.

This page covers what a pre approval actually locks in, how long each major lender holds a rate, how the stress test sets the number, what invalidates a preapproval and the underwriting reason behind each trigger, and how to tell the difference between the maximum you were offered and the payment you should actually sign for.

Signs your pre-approval is softer than you think

These are the situations that turn a comfortable pre-approval into a problem, usually with days left on a financing condition.

What is a mortgage pre-approval, and what is it not?

A mortgage pre-approval is a conditional commitment issued after a lender has reviewed your income documents, verified your down payment and pulled your credit bureau, and it usually includes a rate hold for a set number of days. It answers one question: on what we know about you today, this is the maximum mortgage and this is the rate we will honour if you buy within the hold period.

A pre-qualification answers a different and much weaker question: based on numbers you typed into a form, roughly what might you afford? No underwriter is involved, no documents are reviewed, and no rate is held. Both are often called pre-approval in advertising, which is why buyers arrive at an offer table with a document that means far less than they believe.

The practical test is simple. If a human at a lender has seen your Notices of Assessment and a written commitment exists with a rate, an expiry date and a list of conditions, you have a pre-approval. If you have a PDF with a dollar figure and no conditions listed, you have a pre-qualification with a nicer font.

Pre-qualification against pre-approval, side by side

How long does a mortgage pre-approval last? Rate holds, lender by lender

Most Canadian mortgage pre-approvals last 90 to 120 days, and the expiry that matters is the rate hold. Among the big banks the published holds are 120 days at RBC, Scotiabank, TD and CIBC, and 130 days at BMO. Broker-channel and monoline lenders generally sit in the 90 to 120 day range, and several will re-hold on request if your search runs long.

The hold is a one-way option in your favour. If rates rise during the hold, you keep the held rate. If rates fall, most lenders will float you down to the lower rate at or near funding, though the rules for that vary and are worth asking about in writing before you commit.

What expires is not just the rate. When a hold lapses, the whole file is re-underwritten: new credit pull, refreshed pay stubs, refreshed statements, and re-qualification at whatever the qualifying rate is that week. A borrower whose bonus season has passed or who has taken on a payment since March can come back with a materially smaller number.

Published rate-hold periods on mortgage pre-approvals, August 2026

When should you get pre-approved?

Get pre-approved before you start viewing, not after you find something. A 120-day hold that starts the week you begin looking covers a normal search with room to spare, and it means the first time you see a house you love is not the first time you learn your maximum. If the search runs past the hold, ask for a re-hold rather than letting it lapse silently.

How the stress test sets your pre-approval amount

Every pre-approval in Canada is calculated at the Minimum Qualifying Rate, not the rate you will pay. The MQR is the greater of your contract rate plus 2% or 5.25%. On today's best insured five-year fixed of 4.09%, you are qualified at 6.09%. On the best uninsured five-year fixed of 4.29%, you are qualified at 6.29%. On a 3.35% variable, you are qualified at 5.35%.

The lender then applies two ratio ceilings to a stress-tested payment. Gross Debt Service caps housing cost at 39% of gross income: mortgage payment at the MQR, property tax, heat, and half of any condo fee. Total Debt Service caps everything at 44%: GDS plus 3% of revolving balances monthly, car loans and leases at full payment, student loans and support obligations.

This is why two households with identical incomes get different pre-approvals. The one with a $600 car payment is not carrying $600 less of house. At a 6.09% qualifying rate over 25 years, that payment costs about $93,000 of mortgage. The table below shows the same $130,000 household with and without one vehicle payment.

• Every $100 a month of debt payment costs roughly $15,500 of mortgage at a 6.09% qualifying rate over 25 years.
• A $9,400 credit card balance is counted at 3%, or $282 a month, which is about $43,700 of mortgage.
• An $800 vehicle lease removes about $124,000 of borrowing power, whether or not you can comfortably pay it.
• A 30-year amortization raises the maximum by roughly 7% to 8% because the stress-tested payment drops.
• Yes, you must pass the stress test to be pre-approved. The only broad exemption is an uninsured straight switch at renewal with no increase in amortization or loan amount, which is not a purchase.

Pre-approval maximum on a $130,000 household, $400 property tax and $125 heat per month

Does a mortgage pre-approval affect your credit score?

Yes, a real pre-approval requires a hard credit inquiry, and a hard inquiry typically costs a small number of points. A single mortgage inquiry is a minor event on a healthy file. What causes damage is applying separately at four banks over six weeks, because each application generates its own inquiry and the pattern reads as credit-seeking.

Canadian credit bureaus generally group multiple mortgage inquiries made within a short shopping window and treat them as a single event for scoring purposes. The window varies by scoring model, so the safe approach is to do your rate shopping inside a couple of weeks rather than spreading it across a quarter.

A brokerage sidesteps most of this. We pull your bureau once and submit that same file to multiple lenders, so you are comparing offers across banks, monolines and credit unions without collecting a hard inquiry from each one. If your score is close to a lender tier boundary, that difference alone can be worth a better rate.

• One broker application, one credit pull, many lenders considered.
• Do your mortgage shopping in a tight window, not spread over months.
• Do not open new cards, close old cards, or ask for a limit increase during a pre-approval.
• Keep revolving balances under 30% of the limit, since utilization moves scores fastest.
• A soft check for your own records does not affect your score at all.

What invalidates a mortgage pre-approval, and the underwriting reason for each

A pre-approval is conditional on your circumstances staying the same. Lenders re-verify income and re-pull credit shortly before funding, and any material change reopens the file. The changes below are not rare. They are the ordinary business of life, which is exactly why they catch people.

The order of operations that saves deals is boring: sign nothing, buy nothing, quit nothing and move nothing until the lawyer has funded. If something must change, tell your broker first. A lender that hears about a job change from you can often re-underwrite around it. A lender that discovers it during a funding-day employment call usually cannot.

The table below pairs each trigger with what the underwriter is actually testing, so you can judge which changes are survivable and which are not.

What invalidates a pre-approval, and why the lender cares

Your pre-approval amount is not your budget

A pre-approval is a ceiling set by ratio rules on gross income. It knows nothing about daycare, tuition, a parent you support, a self-employed spouse's variable months, or how much you actually want to spend on a life outside the house. Buying to the ceiling is a decision to hand the entire gap between your ratios and your reality to a lender.

The exercise that helps is not more forecasting. It is one subtraction. Take your actual net monthly income, subtract the full housing cost including property tax, heat, condo fees and insurance, and look at what is left against what you currently spend. If the remainder makes you uncomfortable, the number is too big regardless of what the commitment says.

There is also a strategic reason to keep room. A file at the top of its ratios has nothing left for a rate increase at renewal, a property tax reassessment or a special assessment on a condo. Buyers who leave 10% of headroom below their maximum tend to renew calmly five years later. Buyers who use every dollar of it tend to arrive at renewal looking for a refinance.

• Ask what your payment looks like at the qualifying rate, not the contract rate. That is your renewal stress test in advance.
• Add property tax, heat, insurance and 50% of condo fees to the payment before you judge affordability.
• Budget 2% to 4% of purchase price for closing costs, on top of the down payment.
• Keep three months of full housing cost liquid after closing, not zero.
• Telling your realtor your maximum is optional. Telling them your target is usually more useful.

What you need to get pre approved, and how long it takes

A complete pre-approval package is usually assembled in a day and underwritten in 24 hours to three business days. Files stall for one reason far more often than any other: the borrower can produce pay stubs but not Notices of Assessment, or can show a down payment balance but not 90 days of history behind it.

For a salaried borrower the core list is two pieces of government photo identification, two recent pay stubs, a letter of employment stating position, salary, start date and guaranteed hours, two years of T4s, two years of Notices of Assessment, 90 days of statements for every account holding the down payment, and written consent to pull credit.

Self-employed borrowers replace the T4s and letter with two years of T1 Generals and matching Notices of Assessment, plus business registration or articles of incorporation, and often business bank statements. Commission and bonus income needs two years of history to be averaged. Newcomers without a Canadian bureau file use an international credit report, a landlord letter with utility confirmation, or 12 months of bank statements instead.

• Two pieces of government photo identification
• Two recent pay stubs and a letter of employment with guaranteed hours
• Two years of T4s and two years of Notices of Assessment
• 90 days of statements for every account holding down payment funds
• A signed gift letter and the donor's proof of funds, if any of it is gifted
• Statements for every debt: cards, lines of credit, car loans, student loans
• Written consent for the Equifax or TransUnion pull

Can you be denied a mortgage after pre-approval?

Yes. A pre-approval underwrites you; it does not underwrite the house. Once you have an accepted offer, the lender orders an appraisal, reviews the property type and its marketability, and on a condo reads the status certificate or the strata documents. Any of those can produce a decline or a reduced loan amount on a file where the borrower was never in question.

The most common property-level problems are an appraisal below the purchase price, which cuts the mortgage because lending is based on the lower of price and value; a condo corporation with a weak reserve fund, ongoing litigation or a pending special assessment; a property with unusual characteristics such as a very small unit, agricultural zoning, a former grow operation, oil tank, or well and septic issues; and non-standard construction or a rural location with limited comparable sales.

This is exactly why waiving a financing condition is a real risk even with a strong pre-approval. If you must waive to win in a competitive market, do it with your broker's eyes on the specific property first. We run an automated valuation model on the subject address before an offer goes in, so a value gap is a conversation on Saturday rather than a crisis on the Tuesday your condition expires.

Where deals fail after a pre-approval

How Lendmax builds a pre-approval that holds up

A pre-approval is only as good as the underwriting behind it. Our goal is a commitment that survives an appraisal, a re-pull and a funding-day employment call, not a large number that impresses your realtor and then moves.

The sequence matters. Credit first, because it constrains which lenders are even available. Income second, because how it is calculated is worth more than rate. Property last, because that is where the surprises live.

1. One credit pull, read with AI assistance — We pull a single bureau and run an automated review of it: revolving utilization, balances counted at 3%, accounts near a lender tier boundary, stale collections and inquiries that need an explanation. Anything fixable is addressed before the file goes anywhere.
2. Calculate your income under several lender policies — Bonus, overtime, commission, shift premiums, self-employment and rental income are treated differently by every lender. We compute your qualifying income under multiple policies and use the highest figure that is fully documentable, then verify the down payment across 90 days.
3. Compare and hold across 30+ lenders — The same file is priced at banks, monolines and credit unions at once, weighing rate against amortization, prepayment privileges and penalty formula. We hold a rate for 90 to 120 days and re-hold if your search runs long, so a slow market does not re-price your purchase.
4. Value the property before you write the offer — We run an automated valuation on the subject address and flag condo, zoning or marketability risks while you can still add a condition. Commitment, conditions and signatures are handled digitally, and we work directly with your lawyer through to funding.

This page covers: mortgage pre approval, how to get pre approved for a mortgage canada, how long does a mortgage pre approval last, pre approval vs pre qualification, does mortgage pre approval affect credit score, mortgage pre approval online canada, 120 day rate hold mortgage, can you be denied a mortgage after pre approval, how long does mortgage pre approval take, mortgage preapproval letter canada, best bank for mortgage pre approval canada, mortgage pre approval self employed canada, what not to do after mortgage pre approval.