How Mortgage Insurance Works for Canadian Home Buyers

Mortgage insurance protects the lender if a high-ratio borrower defaults. It is required when the down payment is under 20%, and the premium is often added.

By Promissory.ca Editorial Team Reviewed against official Canadian sources Last updated: 2026-09-16

Mortgage default insurance is a government-backed or private insurance policy that protects the lender, not the borrower, when a high-ratio mortgage goes into default. In Canada, it is most commonly required when a buyer purchases a home with a down payment below twenty per cent of the purchase price. The insurance allows federally regulated lenders to offer mortgages with smaller down payments while reducing their risk.

What Mortgage Insurance Covers — and What It Does Not

Mortgage insurance covers a lender's financial loss if a borrower defaults and the property must be sold. After a default, the lender typically takes legal steps to sell the home. If the sale proceeds are not enough to repay the outstanding mortgage balance, accrued interest, and certain costs allowed under the mortgage documents, the insurer may reimburse the lender for the shortfall, subject to the policy terms. This protection is why lenders can approve high-ratio mortgages that would otherwise be considered too risky.

The insurance does not protect the borrower's equity, credit score, or monthly budget. It does not pay the mortgage if the borrower loses a job or becomes ill. It is not mortgage life insurance or creditor insurance, which are separate products designed to pay a benefit on death or disability. Mortgage insurance also does not mean the borrower can simply hand back the keys without consequence. The borrower generally remains liable for the debt, and the lender or insurer may pursue legal remedies to recover the shortfall.

There is also an important distinction between mortgage default insurance and a mortgage insurance premium. The default insurance is the policy that protects the lender. The premium is the cost charged for that policy. Depending on the lender and insurer, the premium may be paid upfront at closing or added to the mortgage balance.

When Mortgage Insurance Is Required in Canada

In Canada, mortgage insurance is required for a high-ratio mortgage, which is generally a mortgage with a loan-to-value ratio above eighty per cent. In plain terms, that means the down payment is less than twenty per cent of the property's purchase price or value. Federally regulated lenders must obtain mortgage default insurance for these loans. The rule applies to owner-occupied homes and some other residential properties, subject to insurer and lender guidelines.

Minimum down payment rules determine when a mortgage is high-ratio. The required minimum down payment is five per cent on the portion of the purchase price up to five hundred thousand dollars, ten per cent on the portion from five hundred thousand dollars to one and a half million dollars, and twenty per cent above one and a half million dollars. If the total down payment is below twenty per cent, mortgage insurance is generally required. The maximum amortization for an insured mortgage is twenty-five years.

It is possible to have a down payment above the minimum but still below twenty per cent. For example, a buyer might put down more than five per cent but less than twenty per cent. That mortgage is still high-ratio, so default insurance is generally required. Once the down payment reaches twenty per cent, the mortgage is conventional or low-ratio, and default insurance is usually not required by the lender. Some borrowers may still be offered optional insurance products, but those are different from mandatory mortgage default insurance.

Provincial rules and lender policies can affect the details. A lender may have its own credit, income, and property requirements even when insurance is available. Federally regulated lenders also apply the mortgage stress test under OSFI Guideline B-20, qualifying borrowers at the greater of the contract rate plus two percentage points or five and a quarter per cent. This test is separate from the insurance premium, but it affects how much a borrower can qualify for.

How Mortgage Insurance Premiums Work

The mortgage insurance premium is calculated as a percentage of the mortgage loan amount. The exact percentage depends on the insurer's premium table, the loan-to-value ratio, and the amortization period. A higher loan-to-value ratio means the lender is taking more risk, so the premium rate is generally higher. A longer amortization also increases risk and usually leads to a higher premium rate. The premium is not a fixed fee that is the same for every borrower.

Loan-to-Value Ratio

Loan-to-value ratio compares the mortgage amount to the property's value or purchase price. A borrower with a very small down payment has a high loan-to-value ratio. A borrower with a down payment closer to twenty per cent has a lower loan-to-value ratio. Because the insurer's exposure is greater when the loan-to-value ratio is higher, the premium rate is typically higher in that situation. This is one reason a larger down payment can reduce the cost of mortgage insurance even before the borrower reaches the twenty per cent threshold.

Amortization Period

The amortization period is the length of time used to pay off the mortgage through regular payments. For an insured mortgage, the maximum amortization is twenty-five years. A shorter amortization means the borrower builds equity faster and the lender's risk is reduced. As a result, a shorter amortization may lead to a lower insurance premium rate. A longer amortization, up to the maximum allowed, may increase the premium rate because the loan remains outstanding for longer.

Payment Options

Mortgage insurance premiums are usually paid in one of two ways. The borrower can pay the premium upfront at closing, or the lender can add the premium to the mortgage balance. When the premium is added to the mortgage, it is often called capitalizing the premium. The borrower then pays interest on the premium over the life of the mortgage. Paying upfront avoids interest on the premium, but it requires more cash at closing. The right choice depends on the borrower's cash flow, mortgage terms, and financial goals.

Premium Is Not Interest

The insurance premium is a cost of borrowing, but it is not the same as the mortgage interest rate. The interest rate determines the cost of the borrowed principal over time. The insurance premium is a one-time charge for the default insurance policy, though it may be financed through the mortgage. Borrowers should review both costs when comparing mortgage options. A lower interest rate may not always mean a lower total cost if the mortgage insurance premium is higher or if other fees apply.

Mortgage Insurance vs. Mortgage Life Insurance

Mortgage insurance and mortgage life insurance are often confused because both include the word insurance. Mortgage default insurance protects the lender if the borrower defaults. Mortgage life insurance is an optional product that pays a benefit to the lender or the borrower's estate when the insured borrower dies. It may also include coverage for disability or critical illness, depending on the policy. Mortgage default insurance is typically required for high-ratio mortgages, while mortgage life insurance is optional.

Another difference is who benefits. With default insurance, the lender is the beneficiary. With mortgage life insurance, the borrower or their estate is the beneficiary, and the payout is usually used to pay down or pay off the mortgage. Borrowers should not assume that having mortgage default insurance means their family is protected if they die. They may need separate life insurance or creditor insurance if that protection is important to them.

How to Reduce the Cost of Mortgage Insurance

There are several general ways a borrower may be able to reduce the cost of mortgage insurance. The options depend on the borrower's finances, the property, and the lender's rules.

• Increase the down payment. A larger down payment lowers the loan-to-value ratio and may reduce the premium rate. If the down payment reaches twenty per cent, the mortgage is no longer high-ratio, so default insurance is generally not required.
• Choose a shorter amortization. A shorter amortization may lower the premium rate because the loan is repaid faster. The maximum amortization for an insured mortgage is twenty-five years.
• Compare mortgage options. Different lenders and insurers may structure the premium differently, and some may offer different payment options. Comparing total borrowing costs, not just the interest rate, can help.
• Pay the premium upfront if cash allows. Paying the premium upfront avoids adding it to the mortgage balance and paying interest on it over time.
• Review the property and loan type. Insurer rules can vary by property type, occupancy, and loan purpose. A lender or licensed mortgage professional can explain which rules apply.

Common Misunderstandings About Mortgage Insurance

One common misunderstanding is that mortgage insurance protects the borrower. In fact, the policy protects the lender. The borrower benefits indirectly because the insurance makes high-ratio financing possible, but the borrower does not receive a payout if they default. Another misunderstanding is that mortgage insurance is always required. It is generally required only when the down payment is below twenty per cent and the lender requires default insurance. A borrower with a twenty per cent down payment usually does not need it.

Some borrowers also believe that once they pay the premium, they can walk away from the mortgage without further obligation. That is not correct. The borrower remains responsible for the debt, and the lender may take legal action to recover any shortfall. Mortgage insurance may reduce the lender's loss, but it does not erase the borrower's contractual obligations. Finally, the premium is not refundable simply because the borrower sells the home or refinances later. The terms of the insurance policy and the mortgage documents govern what happens.

What to Check Before You Buy

Before committing to a mortgage, borrowers should ask the lender whether mortgage insurance is required and how the premium will be calculated. They should ask whether the premium will be paid upfront or added to the mortgage balance. They should also ask what happens if they sell, refinance, or default. Because mortgage insurance rules involve federal, provincial, and insurer requirements, it is wise to get information from the lender and from a licensed mortgage professional. This guide is general information only and is not legal, tax, or financial advice.