Put Down 8% and You'll Beat the Rate Your Neighbour Got With 25%
The government backstop just saved someone putting down 8% about forty basis points versus the person who scraped together 25%. That's roughly $8,000 over five years on a $600,000 property in Greater Victoria. Nobody tells you this when you're draining your TFSA trying to hit the 20% threshold.
Here's what actually happens. A mortgage with less than 20% down in Canada requires default insurance. CMHC, Sagen, or Canada Guaranty. The premium runs between 2.8% and 4% of the loan amount, depending on how thin your down payment is. Most people finance it into the mortgage. It feels like a penalty. It reads like a penalty in every first-time buyer guide published since 2005.
It isn't.
The Insurance Creates the Discount
From the lender's perspective, an insured mortgage is a different product. If you default, the insurer pays out the claim. The bank doesn't eat the loss. That government-backed guarantee makes the loan lower-risk than a conventional uninsured mortgage, where the lender carries the full downside. So banks compete on rate to win insured volume. As of late 2024, insured five-year fixed rates in BC sit around 4.64%. Uninsured mortgages for the same term, same property, same borrower profile, often price 20 to 50 basis points higher. Sometimes more.
Put down 19%. You pay the insurance premium, roughly $17,000 on a $600,000 purchase, but you lock a 4.64% rate. Put down 25%. You avoid the premium but your rate climbs to 4.94%. Over a five-year term, the rate difference alone costs about $8,200. The premium starts to look like what it actually is: the price of accessing a structurally cheaper cost of funds.
Why Conventional Mortgages Cost More
Uninsured mortgages carry credit risk that the lender prices in. No backstop. If the borrower walks and the property sells for less than the outstanding balance, the bank absorbs the shortfall. That risk shows up in the rate. It also shows up in how lenders treat those files. Insured mortgages move through underwriting faster. Uninsured files get more scrutiny on income verification, property type, amortization.
The quirk gets sharper when you look at portfolio lenders versus the big banks. A monoline lender who securitizes insured mortgages and sells them into the Canada Mortgage Bond market has almost no balance-sheet risk and can price very tightly. A bank holding an uninsured mortgage on its own books for twenty-five years has to reserve capital against it under OSFI rules. That cost gets passed to the borrower.
The Trade-Off Most Buyers Miss
The insurance premium is real money. It's also a one-time cost for access to a lower rate that compounds over the entire term. If you're planning to stay in the property and rates don't collapse in year two, the math consistently favors the insured loan for buyers who can't comfortably exceed 20% without liquidating long-term savings.
Where it flips: refinances. You can't add insurance to an existing uninsured mortgage. Once you're above 20% equity, you're in the conventional pool, paying conventional rates. The discount was a first-purchase advantage. It doesn't follow you.
The other miss: portability. If you move and your equity has climbed above 20% of the new purchase price, your insured mortgage becomes uninsured mid-term and the rate advantage disappears on any additional funds you need to borrow.
So the buyer who stretched to 25% down to avoid the premium often paid more, not less, in total cost of borrowing over five years. The system is backwards by design. The insurance exists to protect lenders and expand access to credit. The rate discount is a byproduct of that risk transfer. It just happens to benefit the borrower with less cash on hand.
That's the part nobody mentions when they're congratulating you for clearing the 20% line.
