Ottawa Mortgage Blog

Is Mortgage Default Insurance Really a Bad Deal?

May 19, 2026 | Posted by: Jamie Small - Ottawa Mortgage Broker

Ask many Canadians working toward homeownership about mortgage default insurance, and you’ll likely hear a groan. It’s widely seen as an extra cost — a penalty, almost, for not having a large enough down payment. Many buyers will go to great lengths to avoid it, delaying their purchase by years just to cross the 20% threshold. But in 2026’s lending environment, that strategy may be costing you far more than you think.

Let’s take an honest look at what mortgage default insurance actually is, how much it costs — and why, for many buyers, it might genuinely work in your favour.

What Is Mortgage Default Insurance?

Mortgage default insurance — sometimes called CMHC insurance, after the Canada Mortgage and Housing Corporation — is a type of insurance required by law for any home purchase with a down payment of less than 20%. In Canada, it is provided by three approved insurers: CMHC, Sagen (formerly Genworth Canada), and Canada Guaranty.

Here’s the part that catches many buyers off guard: the insurance doesn’t protect you. It protects your lender. If you were to stop making your mortgage payments and your lender suffered a loss, the insurer steps in to cover it. From the bank’s perspective, the mortgage is essentially risk-free.

How Much Does It Cost?

The premium is calculated as a percentage of your mortgage amount, based on your down payment size. The less you put down, the higher the premium — though the scale is not as punishing as many people assume.

Mortgage Default Insurance Premium Rates

5% down payment
- Loan-to-value: 95%
- Premium rate: 4.00%

10% down payment
- Loan-to-value: 90%
- Premium rate: 3.10%

15% down payment
- Loan-to-value: 85%
- Premium rate: 2.80%

20%+ down payment
- Loan-to-value: 80% or less
- Premium rate: Not required

The good news: you don’t pay this premium out of pocket. It’s added directly to your mortgage balance and amortized over the life of the loan. On a $600,000 home with a 10% down payment, the insured mortgage would be $540,000, and the 3.10% premium adds $16,740 to your balance.

What people often overlook is the benefits the insurance premium provides.

The Real Reason Many Buyers Delay — And Why It Often Backfires

The thinking is logical on the surface: if I can reach 20% down, I avoid the insurance premium entirely. For many buyers, that means renting for another two or three years, saving every extra dollar, and waiting for the right moment to enter the market.

But there’s often a cost associated with waiting.

Canadian home prices have historically increased by roughly 5.5% year-over-year in the past 50 years. If we use an ultra conservative assumption of 2% value increase year-over-year, if the home you’re targeting today is priced at $600,000, a two-to-three year delay could see that property appreciate to $625,000–$636,000. That’s an increase of $25,000 to $36,000 — the same premium you were trying so hard to avoid, and then some. You’d also need to save a larger down payment just to hit the same loan-to-value ratio on a more expensive property.

The delay strategy can feel responsible. But the numbers often work against it.

The Rate Advantage You May Not Know About

In 2026, insured mortgages in Canada consistently attract better interest rates than uninsured ones — and the gap can be significant.

There are two key reasons for this. First, because the lender bears zero credit risk on an insured mortgage, they can price that mortgage more aggressively. Second, insured mortgages qualify for lower-cost funding channels in capital markets precisely because they carry the implicit federal government guarantee — making them highly attractive to institutional investors. That lower funding cost can be passed on to borrowers.

In practical terms, the rate differential between an insured and uninsured mortgage can be 0.25% or more. On a $540,000 mortgage, that is not a rounding error. It translates to thousands of dollars over each five-year term.

And critically: once your mortgage is insured, it stays insured — through renewal after renewal — unless you refinance. That means the interest rate benefit doesn’t just apply to your first term. It follows your mortgage for its entire insured life.

Running the Numbers: A Real-World Example

Let’s put some concrete figures around this. Consider a $600,000 home purchase today with a 10% down payment.

INSURED MORTGAGE (BUY NOW, 10% DOWN)

• Down payment: $60,000
• Mortgage balance: $540,000
• Insurance premium: $16,740
• Total mortgage balance: $556,740
• Rate benefit: ~0.25% lower

UNINSURED (WAIT 2–3 YEARS FOR 20% DOWN)

• Estimated new price: $625,000–$636,000
• Required down payment: $125,000–$127,000
• Mortgage: ~$500,000–$509,000
• Insurance premium: $0
• Rate: ~0.25% higher

And, here are the long-term interest savings projected at a 0.25% rate advantage:

→ After Term 1 (5 Years)
Estimated interest savings: $6,445
Remaining insurance cost: $10,295

→ After Term 2 (10 Years)
Estimated interest savings: $12,056 cumulative
Remaining insurance cost: $4,684

→ After Term 3 (15 Years)
Interest savings exceed the original premium
Net savings begin

After two full 5-year terms, the net cost of default insurance is only $4,684. By the third renewal, the cumulative interest savings exceed the premium entirely — and from that point forward, every term is pure savings.

Rethinking the Conventional Wisdom

The conventional wisdom — that default insurance is a cost to be avoided at all costs — was formed in an era when the rate differential between insured and uninsured mortgages was smaller, and when the goal was simply to minimize the total amount borrowed. That calculus has shifted.

Today, if you are in a position to buy with 5–19% down, you may actually be better served entering the market sooner, accepting the insurance premium, and capturing both the lower interest rate and the price appreciation of a home you already own — rather than watching from the sidelines while the market moves further out of reach.

This isn’t a universal recommendation. Your specific situation, timeline, and local market conditions all matter. But the blanket assumption that insured mortgages are a financial loss deserves serious scrutiny.

For more guidance, contact me, Jamie Small your Ottawa, Ontario Mortgage Broker today.

This post is intended for general informational purposes only and does not constitute financial or mortgage advice. Mortgage default insurance premiums, qualifying rules, and lender rate policies are subject to change. Always consult a licensed mortgage broker or financial advisor for guidance specific to your circumstances.

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