CMHC Mortgage Default Insurance in Canada (2026): The Premium Math

Mortgage default insurance is one of the most-misunderstood costs of buying a home in Canada. It’s not optional, it’s not protecting YOU, and the premium can add tens of thousands to your mortgage. Here’s what it actually does and what it costs in 2026.

What it is + who it protects

Mortgage default insurance protects the LENDER (your bank) if you stop making mortgage payments and they have to foreclose. The insurer pays the bank the difference between what they recover from selling your home and what you still owed. You’re the one who PAYS for the insurance, but you’re NOT the beneficiary — the bank is.

When it’s required

• Down payment under 20%: default insurance is MANDATORY (federal regulation)
• Down payment 20% or more: not required, but some banks may still want it on edge cases (low credit, self-employed without traditional income docs)
• “High-ratio mortgage”: the formal term for any mortgage with less than 20% down — these always need default insurance

If you put exactly 20% down, you avoid the requirement. This is why first-time buyers often stretch to hit 20% — saving the insurance premium adds up to real money.

The premium math (2026 rates)

The premium is ADDED to your mortgage balance (you’re not asked to pay it upfront). So on a $500K home with 5% down ($25K), you borrow $475K + $19K premium = $494K total mortgage. You pay interest on the premium amount for the life of the mortgage.

The three insurers

• CMHC (Canada Mortgage and Housing Corporation): Crown corporation, the dominant insurer historically. Strictest underwriting criteria.
• Sagen (formerly Genworth Canada): Privately owned. Often slightly more flexible than CMHC on certain edge cases. Identical premium rates.
• Canada Guaranty: Newest of the three, privately owned. Competitive on premiums + similar underwriting to Sagen.

You typically don’t choose your insurer — the bank submits your application to whichever they have the strongest relationship with, or the one most likely to approve your specific case. All three charge the same premium rates federally regulated. The differences are in approval flexibility.

Provincial sales tax on premium (Ontario, Quebec, Manitoba, Saskatchewan)

Four provinces apply PST on the mortgage insurance premium:

• Ontario: 8% PST on premium
• Quebec: 9% PST on premium
• Manitoba: 7% PST on premium
• Saskatchewan: 6% PST on premium

This must be paid UPFRONT at closing (unlike the premium itself, which is added to the mortgage). On a $19,000 premium in Ontario, that’s an additional $1,520 cash needed at closing. Many first-time buyers don’t budget for this and get surprised at the last minute.

The maximum mortgage CMHC will insure

• Maximum purchase price for CMHC-insured mortgage: $1.5 million (raised from $1M in 2024)
• Maximum amortization with CMHC insurance: 30 years for first-time buyers AND new construction (raised from 25 years in 2024); 25 years for all other CMHC-insured mortgages
• Properties NOT eligible: revenue properties (4+ units), vacation/seasonal properties, properties with significant agricultural use

If your home costs more than $1.5M, you can’t use mortgage default insurance — you MUST put 20%+ down. This rule effectively splits Canadian housing markets: Toronto/Vancouver buyers above $1.5M operate differently than buyers below.

Should you put 20% down to avoid the premium?

Not always. The math:

• Save the premium: $19K on a $500K mortgage
• Cost of waiting longer to save more: housing appreciation 3-5% annually could mean the home costs $25-50K more by the time you have 20% saved
• Opportunity cost of larger down payment: $50K extra down vs invested at 7% = $50K × 7% = $3,500/year forgone returns

For many newcomer families and young buyers in expensive markets, buying with less than 20% down + paying the CMHC premium beats waiting years to save 20%. The break-even depends on local appreciation rates + your savings velocity.

The historical context — why default insurance exists

CMHC was created in 1946 (then called Central Mortgage and Housing Corporation) to help returning WWII veterans buy homes when private lenders considered them too risky. The mandatory mortgage insurance for low-down-payment buyers was the mechanism: by guaranteeing the loans, banks would lend at reasonable rates to buyers with as little as 5% down. Without CMHC insurance, Canadian first-time buyers would historically have needed 25-30% down to qualify for any mortgage. That requirement would have priced an entire generation out of homeownership.

The downside nobody mentions

Default insurance keeps lending volumes high during good times, but it also subsidizes risk-taking. Critics argue that without mandatory insurance, banks would be more cautious about lending to marginal borrowers — which would mean fewer high-risk mortgages but also less housing market liquidity. Studies by the Bank of Canada have shown that CMHC-insured mortgages perform similarly to uninsured mortgages in normal markets but contribute to amplified housing market cycles. The system works most of the time; it stress-tests poorly during major downturns.