Mortgage Default Insurance in Canada, Explained

Mortgage default insurance protects the lender if you default, and it is required whenever your down payment is less than 20% of the purchase price. The premium is a one-time charge calculated as a percentage of the loan, and it rises in tiers as your loan-to-value ratio climbs. The single most important point is that this insurance protects the lender, not you, and you are the one who pays for it.

What mortgage default insurance is

When a buyer puts down less than 20%, the lender is taking on more risk. Mortgage default insurance transfers most of that risk to an insurer. In exchange, the lender can offer a lower rate than it otherwise would, because a default is partly covered.

Because the lender's risk is reduced, insured mortgages often carry a lower interest rate than uninsured ones at the same term. In that sense the premium buys access to a lower rate as well as to the loan itself. The trade-off is that the premium is a real cost, and it grows the smaller your down payment becomes.

It is not the same as mortgage life insurance or creditor insurance, which are optional products that pay off a mortgage if the borrower dies. Default insurance is a requirement of the lender for high-ratio loans, and the cost is passed on to you.

When you need it and who provides it

The trigger is the loan-to-value ratio, or LTV: the loan amount divided by the property's lending value. A down payment below 20% means an LTV above 80%, which is a high-ratio mortgage, and that is when default insurance applies. Federally regulated lenders must insure high-ratio mortgages.

In Canada, mortgage default insurance is provided by CMHC and by private insurers. The federal government sets the framework, and OSFI's Guideline B-20 governs the underwriting practices lenders use. The maximum insurable purchase price, the maximum amortization, and the maximum LTV all depend on current federal rules, so confirm the current limits with CMHC or your lender before you assume you qualify.

How the tiered premium is structured

The premium is not a single rate. It steps up as LTV rises, so a buyer with a large down payment pays a lower percentage than a buyer with the minimum. The bands are broadly as follows; the actual percentages are published by the insurer and change from time to time.

A non-traditional down payment means funds that are borrowed or otherwise not from your own resources, such as an unsecured line of credit. Confirm the current premium table and the exact definitions with CMHC, since the published rates are updated periodically.

How LTV and amortization affect the premium

Two variables move the premium more than any others. The first is LTV: every step down in LTV band reduces the percentage applied to the whole loan, which is why increasing your down payment can lower the premium sharply. The second is amortization: an extended amortization can carry a premium surcharge for eligible buyers, and the maximum amortization for an insured mortgage is capped by federal rules.

A smaller down payment also means a larger loan, so the premium percentage and the base it applies to both rise at the same time. That double effect is why the cost of a minimum down payment is more than the headline premium rate suggests.

Property type also matters. Owner-occupied properties with one to four units are treated differently from non-owner-occupied rental properties, and the maximum LTV is lower for three- and four-unit properties. The interaction between LTV, amortization, and property type is the reason two buyers with the same purchase price can pay very different premiums.

How the premium is paid

Most borrowers do not pay the premium in cash at closing. Instead, it is added to the mortgage balance and paid off over the amortization, which means you pay interest on it as well. That is a key reason the true cost of a low down payment is higher than the premium percentage alone suggests.

In several provinces the premium is subject to provincial sales tax, and that tax is normally paid in cash at closing rather than added to the mortgage. Ask your lender to show the premium and any tax separately, so you know exactly what you are financing and what you must bring to closing.

You can see the effect on your payment with the CMHC insurance calculator, and the minimum down payment guide explains the thresholds that trigger insurance.

What it does not cover and how to avoid it

Default insurance does not protect you if you fall behind; it protects the lender. It also does not cover your other closing costs. To avoid paying it entirely, you need a down payment of at least 20%, which is a conventional mortgage. The trade-off is that a larger down payment reduces your available cash and may slow your purchase.

If you cannot reach 20%, compare the total cost of the premium against waiting and saving more, and check whether a family gift or a first-time buyer program could close the gap. The closing costs guide lists the other upfront costs, and the borrowing guide shows how the premium affects your ratios. The stress test guide explains the qualifying rate lenders must use.