Your 5% Down Payment Just Bought You a Lower Rate Than Your Neighbor's 25%
The homebuyer with $120,000 saved for a down payment on a $600,000 condo in Vancouver walked into a rate of 5.29%. The couple next door, scraping together $30,000, locked 4.89%. Same building, same lender, same week in October 2024.
The higher your down payment in Canada, past a certain threshold, the worse your rate gets. That sentence reads like a typo. It isn't.
The Insurance Nobody Wants Pays for Itself
Put down less than 20% on a Canadian residential mortgage and you trigger a hard rule: mandatory default insurance. CMHC, Sagen, Canada Guaranty. The premium runs between 2.8% and 4% of the loan amount, usually capitalized into the mortgage itself, and it protects the lender if you default. Not you. The lender.
That insurance reshapes the risk profile of your loan entirely. A $570,000 mortgage with 5% down and CMHC backing is a safer bet for the bank than a $480,000 mortgage with 20% down and no insurance. If the borrower with the insured loan stops paying, the insurer covers the loss. The borrower with 20% down? The bank eats it, or goes through the foreclosure process and hopes the sale covers the gap.
So the insured loan gets the better rate. By 20 to 50 basis points in most cases, sometimes more during periods when the uninsured space tightens up. The buyer who stretched to hit 20% down to avoid the insurance premium just bought into a higher rate for the life of the term.
The Premium is Real, But So is the Spread
The insurance premium on a $570,000 loan at 5% down runs about $22,000, folded into a new total loan of $592,000. You're paying interest on that $22,000 for as long as the mortgage runs. Over five years at 4.89%, that's real money.
But the rate advantage compounds too. A 40-basis-point spread between 5.29% and 4.89% on a $592,000 loan saves roughly $12,000 in interest over a five-year term. The premium costs more, yes. The question is what you do with the $90,000 you didn't have to put down. If it's sitting in a 4% HISA, you're behind. If it stayed invested in a balanced portfolio through the term, the math starts to tilt.
The break-even isn't automatic. But the idea that bigger down payments always win isn't either.
Why This Feels Wrong
First-time buyers grow up hearing one thing: save 20%, avoid the insurance, own more of the house. The advice made sense in a different rate environment. When five-year fixed rates sat at 2.5% and the spread between insured and uninsured mortgages was narrow, the premium was harder to justify. At today's rates, with that spread sitting closer to 40 or 50 basis points, the insured loan is often the sharper trade.
The other reason it feels backward is that we associate higher down payments with lower risk. They are lower risk, for the borrower. More equity, smaller loan, more cushion if prices drop. But lenders don't price mortgages on your comfort. They price them on their exposure. A loan backed by a Crown corporation insurer has no credit exposure. A conventional loan does.
The system rewards the structure, not the discipline.
What Doesn't Get Said
Mortgage insurance exists because it de-risks homeownership at scale for lenders, which keeps credit flowing to buyers who don't have six figures saved. It's a policy tool. The rate advantage is a side effect of that tool working exactly as designed.
The borrower still pays for it. But they pay less per month than the higher-equity buyer across the street, and they kept most of their liquidity. That's not a distortion. It's just what the insurance bought.
