How Mortgage Default Insurance Affects Your Costs

If your down payment is less than 20% of the purchase price, chances are you will need mortgage default insurance to close the deal. This insurance protects the lender, not you, but it still has a direct impact on how much you pay each month and over the life of your mortgage. Understanding how it works can help you plan your down payment and budget more effectively.

What Mortgage Default Insurance Actually Covers

Mortgage default insurance protects the lender in case a borrower stops making payments. In Canada, it is offered through the Canada Mortgage and Housing Corporation (CMHC), as well as two private insurers, Sagen and Canada Guaranty. Despite what many first-time buyers assume, this insurance does not protect you as the homeowner. If you default on your mortgage, the insurer compensates the lender, and the lender can still pursue foreclosure or power of sale.

This type of insurance exists because lenders take on more risk when a borrower puts down less than 20%. By requiring default insurance on these higher-ratio mortgages, lenders are able to offer financing to buyers who might not otherwise qualify, while spreading the risk of default across the insurance system rather than absorbing it entirely themselves.

When It Is Required and When It Is Not

Under federal rules, any mortgage with a down payment of less than 20% of the purchase price is considered a high-ratio mortgage and requires default insurance. This applies to most homes purchased for less than $1 million. As of recent federal changes, some insured mortgage options have been extended to properties priced up to $1.5 million, though the specific thresholds and eligibility criteria can change, so it is worth confirming current rules with a mortgage professional.

If you put down 20% or more, your mortgage is considered conventional, and default insurance is generally not required. However, lenders may still request it in certain cases, such as with self-employed borrowers using alternative income verification, or in specific higher-risk lending scenarios. Properties over $1.5 million are not eligible for insured financing, regardless of down payment size.

How the Premium Is Calculated and Added to Your Mortgage

Default insurance premiums are calculated as a percentage of your mortgage amount, and the percentage decreases as your down payment increases. To illustrate, a mortgage with a 5% down payment could carry a premium in the range of 4% of the loan amount, while a mortgage with a 15% down payment might carry a premium closer to 2.8%. These figures are illustrative only, as actual premium rates depend on the insurer and current rules at the time of your application.

For example, on a home purchased for $500,000 with a 5% down payment, the mortgage amount would be roughly $475,000 before insurance. If the premium rate were 4%, that would add approximately $19,000 to the mortgage balance. Most lenders allow this premium to be rolled into the mortgage rather than paid upfront, which means you are also paying interest on the premium itself over the life of the loan. This is one reason a larger down payment can meaningfully reduce your long-term borrowing costs, even beyond the obvious benefit of a smaller mortgage.

Provincial sales tax may also apply to the insurance premium in certain provinces, and this portion typically cannot be added to the mortgage, meaning it may need to be paid at closing. A mortgage professional can walk through how these costs apply to your specific purchase price and location.

How Default Insurance Affects Your Overall Mortgage Costs

Beyond the premium itself, insured mortgages can come with certain trade-offs. Some lenders offer slightly different rate structures for insured versus uninsured mortgages, and insured mortgages are subject to a maximum amortization period, generally capped at 25 years, though extended amortizations of up to 30 years have become available for certain first-time buyers purchasing new builds. Uninsured mortgages, by contrast, may allow for longer amortization periods depending on the lender.

It is also worth understanding that insured mortgages still require borrowers to pass the mortgage stress test, so default insurance does not change your qualifying requirements. The main practical effect is on the upfront cost of borrowing and, in some cases, the interest rate offered. Comparing insured and uninsured scenarios with a mortgage broker can help clarify which path makes more sense depending on your down payment size and financial goals.

Key Takeaways

• Mortgage default insurance protects the lender, not the borrower, in the event of default
• It is generally required when the down payment is less than 20% of the purchase price
• Premiums are calculated as a percentage of the mortgage and decrease as the down payment increases
• Premiums can typically be rolled into the mortgage, but this means paying interest on that amount over time
• A mortgage professional can help compare insured and uninsured scenarios based on your specific situation

Disclaimer: This article is for informational purposes only and does not constitute financial, legal, or mortgage advice. Any numbers, rates, or scenarios mentioned are examples only and may not reflect current market conditions. Always consult a licensed mortgage professional or financial advisor for guidance specific to your situation.