What Is a Conventional Mortgage? Definition, Rules & FAQs for Ontario Buyers (2026)
What Is a Conventional Mortgage?
A conventional mortgage is a home loan where the borrower has made a down payment of at least 20% of the purchase price, resulting in a loan-to-value (LTV) ratio of 80% or less. Because the lender's exposure is capped at that threshold, no mortgage default insurance from CMHC, Sagen, or Canada Guaranty is required under Canadian regulations. That absence of mandatory insurance is the single defining feature that separates a conventional mortgage from an insured (or high-ratio) mortgage.
It's worth being precise about the term itself. In the United States, "conventional loan" refers to any non-government-backed mortgage regardless of how much the borrower puts down. In Canada, the term carries a specific regulatory meaning tied to the 20% down payment threshold and LTV ratio, so US-sourced definitions don't apply directly here.
Conventional mortgages are available from a wide range of lenders in Ontario, including major chartered banks, credit unions, monoline lenders, and trust companies. Our Mortgage Companies in Ontario: Types and Differences guide breaks down what each lender type offers and how they compare. Whether you work directly with a bank or go through a broker (and our Mortgage Broker vs Bank in Ontario: Which Is Cheaper? article explains that trade-off in detail), the conventional mortgage product itself works the same way.
One more rule to know: as of 2024 regulatory changes, any property purchased above $1.5 million is automatically ineligible for an insured mortgage. That means buyers above that price point must provide a conventional-sized down payment regardless of their preference. And because no default insurance premium gets added to the loan balance, conventional borrowers avoid a charge that ranges from 0.60% to 4.00% of the mortgage amount on insured loans, a meaningful saving over the life of a mortgage.
How Conventional Mortgages Work in Ontario: Key Rules, Qualifications, and Comparisons
Qualifying: The Stress Test and Debt Ratios
All conventional mortgage applicants in Canada must pass the federal mortgage stress test, qualifying at the higher of the Bank of Canada's benchmark rate (currently 5.25% as a floor) or their contracted rate plus 2%. This rule applies regardless of whether you're borrowing from a bank, credit union, or monoline lender.
Beyond the stress test, lenders review your Gross Debt Service (GDS) ratio and Total Debt Service (TDS) ratio. Under standard Canadian lender guidelines, your GDS should not exceed 39% and your TDS should not exceed 44%. Because conventional mortgages carry no default insurance, the lender absorbs the full credit risk if you default. That reality means lenders typically apply close scrutiny to your credit score, employment history, and income stability before approving a conventional loan.
Our First-Time Home Buyer Mortgage Advice in Ontario guide walks through how these qualification standards play out in practice for buyers who are approaching the 20% threshold for the first time.
Self-Employed Borrowers
Self-employed applicants seeking a conventional mortgage in Ontario typically need to provide two years of Notices of Assessment from the CRA and may face additional documentation requirements compared to salaried employees. Lenders want to see stable, verifiable income before extending a conventional loan. How Self-Employed Borrowers Qualify for a Mortgage in Ontario covers the specific documentation strategies that help self-employed buyers demonstrate qualifying income.
Amortization: Up to 30 Years
One practical advantage of a conventional mortgage is the longer amortization available. Conventional mortgages in Ontario can be amortized for up to 30 years. By contrast, most insured mortgages are capped at 25 years (with a 30-year option available only for first-time buyers purchasing new builds under 2024 federal rule changes). A longer amortization lowers your regular payment amount, which can improve cash flow, though it does mean paying more interest over the full term.
Your payment frequency also affects total interest costs significantly. Whether you choose weekly, bi-weekly, semi-monthly, or monthly payments, Mortgage Payment Frequency and Savings shows how each schedule affects what you'll pay over the amortization period.
Fixed vs. Variable Rate
Conventional mortgages are available at both fixed and variable rates. A fixed rate locks in your payment for the term (typically one to five years), giving you predictability. A variable rate fluctuates with your lender's prime rate, which can work in your favour when rates fall but increases uncertainty. One practical consideration: breaking a fixed-rate conventional mortgage early often triggers a larger prepayment penalty than breaking a variable-rate mortgage, so your plans for the property matter when choosing between them.
Advantages and Drawbacks
The biggest advantage of a conventional mortgage is straightforward: you don't pay a default insurance premium. On a $700,000 mortgage, a 4.00% CMHC premium would add $28,000 to your loan balance, and you'd pay interest on that premium for the entire amortization. Avoiding that cost is one of the main financial reasons to save toward the 20% threshold.
The main drawback is the upfront capital requirement. On a $900,000 Ontario home, the 20% minimum means accumulating at least $180,000 before you buy. That bar is high, particularly for first-time buyers in the GTA and Southern Ontario markets. First-time buyers can use the RRSP Home Buyers' Plan Ontario Guide to withdraw up to $35,000 per person ($70,000 per couple) tax-free to help reach that threshold. Repeat buyers and move-up buyers often find the conventional threshold easier to clear because their home sale proceeds typically cover the 20% requirement on the next purchase.
Investment Properties
Real estate investors in Ontario almost always need a conventional mortgage. CMHC default insurance is not available for non-owner-occupied residential purchases, which makes the 20% down payment a hard requirement for most investment property financing. Our Investment Property Mortgage Strategies in Southern Ontario guide explains how investors structure their financing and what lenders look for on rental property applications.
Renewals and Refinancing
Conventional mortgages are written in terms (most commonly one to five years), after which the balance comes due for renewal or refinancing. At renewal, you can stay with your existing lender or shop for a better rate elsewhere. Refinancing lets you restructure the loan, access built-up equity, or change your amortization. Mortgage Renewal vs Refinancing in Ontario clarifies the difference between these two paths, and Best Refinance Mortgage Rates in Ontario covers what to look for when you're ready to refinance an existing conventional loan.
Conventional Mortgage FAQs
What does "conventional mortgage" mean?
In Canada, a conventional mortgage means a home loan where the down payment is 20% or more, so no CMHC mortgage default insurance is required. The LTV ratio is 80% or below, which reduces the lender's risk to the point where default insurance is not legally mandated. This definition is specific to Canada. The US definition of a conventional loan refers to any non-government-backed mortgage regardless of down payment size, so that framing doesn't apply here.
What is a conventional mortgage loan?
A conventional mortgage loan is a standard residential mortgage between a borrower and an approved lender (a bank, credit union, or monoline lender) in which the borrower provides at least 20% of the home's value as a down payment. The lender does not require default insurance, and the borrower repays principal and interest through regular scheduled payments over an amortization period of up to 30 years. For help evaluating the loan terms lenders offer, see How to Compare Mortgage Loan Offers in Ontario, and for context on how banks and other lenders differ, Bank Loan vs Mortgage Company in Ontario is a useful starting point.
Is a conventional mortgage good or bad?
It depends entirely on your situation. A conventional mortgage is beneficial for borrowers who can afford the larger down payment, since it avoids costly default insurance premiums and allows longer amortization periods of up to 30 years. For buyers who can't yet reach 20%, a high-ratio insured mortgage gets them into the market sooner, even though it adds the insurance premium to the loan. Neither structure is universally better. The RRSP Home Buyers' Plan Ontario Guide describes one government-backed way to build toward the 20% threshold if you're not quite there yet.
Do you have to pay back a conventional mortgage?
Yes. A conventional mortgage is a loan, not a grant or subsidy, and must be fully repaid. You make regular scheduled payments covering both principal and interest over your agreed amortization period. If payments stop, the lender can initiate power of sale or foreclosure proceedings on the property.
If you're buying, renewing, or refinancing in Ontario and want to understand whether a conventional mortgage fits your situation, we're happy to walk through the numbers with you. Reach out to Burns Mortgages for straightforward, no-pressure advice.