The 10% Down Payment Threshold Saves You Less Than You Think
You scrape together $70,000 for a $700,000 townhouse in Kanata, hit exactly 10% down, and the mortgage broker says congratulations, you just saved yourself nine-tenths of a percentage point on the insurance premium. That sounds meaningful. It isn't.
Here's what actually changed. At 5% down, your mortgage insurance premium would run 4.0% of the loan amount. At 10%, it drops to 3.1%. On a $630,000 mortgage, that's $19,530 instead of $25,200. You saved $5,670 in premium costs by putting down an extra $35,000 in cash. The premium gets rolled into your mortgage principal, so over 25 years at 5.5%, the monthly payment difference works out to roughly $33.
Thirty-three dollars a month. That's the reward for locking up five years' worth of TFSA contributions.
Why the Next Tier Matters Even Less
The math gets worse at 15%. Moving from 10% down to 15% down cuts the premium rate from 3.1% to 2.8%, a 0.3% drop, one-third the size of the 5-to-10 move. On that same $700,000 property, you're now comparing a $19,530 premium to a $16,660 premium. The savings: $2,870. To earn that, you had to scrape together another $35,000 in cash. Your monthly payment drops by about $17.
At that point you're not optimizing. You're just moving money around.
The only threshold that materially changes the game is 20%, and not because of the premium. At 20% down, the premium disappears entirely, yes, but the real shift is access to conventional mortgage terms: 30-year amortizations, which drop monthly payments by hundreds of dollars, and the ability to buy properties over $1.5 million, which the insured market caps out at as of 2025. The 20% threshold isn't about avoiding a 2.8% fee. It's about structural flexibility.
What the Premium Structure Actually Reflects
Insurance premiums tier down because default risk tiers down. A buyer with 5% equity has less skin in the game than a buyer with 15%. The premium structure prices that risk. But the tiers were never designed to create savings incentives for individual buyers. They were designed to protect lenders while keeping the government-backed insurance system solvent.
Buyers treat the tiers like achievement levels in a video game. Industry treats them like actuarial pricing. The two perspectives don't align.
What gets lost in this is opportunity cost. That extra $35,000 you deployed to move from 5% to 10% could sit in a First Home Savings Account earning 5% to 7% tax-free, or cover the first two years of property tax and emergency repairs, or remain liquid in case one of you loses a job six months after closing. The $5,670 you "saved" on the insurance premium isn't cash back. It's a reduction in a liability you're carrying for 25 years, most of which you'll pay in interest anyway.
Sagen, Canada Guaranty, and CMHC all use the same rate card. There's no shopping around. The tiers are what they are.
The Hidden Cost Nobody Mentions
In Ontario, the 8% provincial sales tax on the insurance premium is due in cash at closing. Not rolled into the mortgage. Cash. On a $630,000 mortgage at 10% down, that's $1,562 you need to produce the day you get the keys. On the 5% down version, it's $2,016. The PST "savings" from hitting 10%: $454.
That's the part brokers forget to mention when they're congratulating you on moving up a tier.
If your household is stretching to hit 10% because the internet said it's the smart move, run the numbers on what you're actually buying with that extra cash. Because $33 a month is what a cell phone plan costs, not what financial security looks like.
You scrape together $70,000 for a $700,000 townhouse in Kanata, hit exactly 10% down, and the mortgage broker says congratulations, you just saved yourself nine-tenths of a percentage point on the insurance premium. That sounds meaningful. It isn't.
Here's what actually changed. At 5% down, your mortgage insurance premium would run 4.0% of the loan amount. At 10%, it drops to 3.1%. On a $630,000 mortgage, that's $19,530 instead of $25,200. You saved $5,670 in premium costs by putting down an extra $35,000 in cash. The premium gets rolled into your mortgage principal, so over 25 years at 5.5%, the monthly payment difference works out to roughly $33.
Thirty-three dollars a month. That's the reward for locking up five years' worth of TFSA contributions.
Why the Next Tier Matters Even Less
The math gets worse at 15%. Moving from 10% down to 15% down cuts the premium rate from 3.1% to 2.8%, a 0.3% drop, one-third the size of the 5-to-10 move. On that same $700,000 property, you're now comparing a $19,530 premium to a $16,660 premium. The savings: $2,870. To earn that, you had to scrape together another $35,000 in cash. Your monthly payment drops by about $17.
At that point you're not optimizing. You're just moving money around.
The only threshold that materially changes the game is 20%, and not because of the premium. At 20% down, the premium disappears entirely, yes, but the real shift is access to conventional mortgage terms: 30-year amortizations, which drop monthly payments by hundreds of dollars, and the ability to buy properties over $1.5 million, which the insured market caps out at as of 2025. The 20% threshold isn't about avoiding a 2.8% fee. It's about structural flexibility.
What the Premium Structure Actually Reflects
Insurance premiums tier down because default risk tiers down. A buyer with 5% equity has less skin in the game than a buyer with 15%. The premium structure prices that risk. But the tiers were never designed to create savings incentives for individual buyers. They were designed to protect lenders while keeping the government-backed insurance system solvent.
Buyers treat the tiers like achievement levels in a video game. Industry treats them like actuarial pricing. The two perspectives don't align.
What gets lost in this is opportunity cost. That extra $35,000 you deployed to move from 5% to 10% could sit in a First Home Savings Account earning 5% to 7% tax-free, or cover the first two years of property tax and emergency repairs, or remain liquid in case one of you loses a job six months after closing. The $5,670 you "saved" on the insurance premium isn't cash back. It's a reduction in a liability you're carrying for 25 years, most of which you'll pay in interest anyway.
Sagen, Canada Guaranty, and CMHC all use the same rate card. There's no shopping around. The tiers are what they are.
The Hidden Cost Nobody Mentions
In Ontario, the 8% provincial sales tax on the insurance premium is due in cash at closing. Not rolled into the mortgage. Cash. On a $630,000 mortgage at 10% down, that's $1,562 you need to produce the day you get the keys. On the 5% down version, it's $2,016. The PST "savings" from hitting 10%: $454.
That's the part brokers forget to mention when they're congratulating you on moving up a tier.
If your household is stretching to hit 10% because the internet said it's the smart move, run the numbers on what you're actually buying with that extra cash. Because $33 a month is what a cell phone plan costs, not what financial security looks like.
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