Finance

The 20% Down Payment Myth: Why It's Holding Buyers Back

By Georges Matar · July 25, 2026 · 5 min read

“Save 20% before you buy. Never pay mortgage insurance.” This advice gets passed down like family wisdom. It is sometimes right. It is not a universal truth, and applied without doing the math it delays buyers who would have been better off buying sooner.

Here are the numbers, and the method for deciding in your case.

The real minimum down payment in Quebec

The Canadian rule is tiered. It applies by bracket, not to the total price:

5% on the portion up to $500,000
10% on the portion from $500,000 to $1,500,000
20% on the whole price from $1,500,000 up

In practice:

Purchase price	Minimum down payment	As a percentage
$400,000	$20,000	5%
$500,000	$25,000	5%
$700,000	$45,000	6.4%
$900,000	$65,000	7.2%
$1,500,000	$300,000	20%

Many buyers assume they need 20% from the start and postpone their plans by two or three years based on a number that does not apply to them.

What CMHC insurance actually costs

Below 20% down, mortgage default insurance is mandatory. The premium is a percentage of the amount borrowed, and it depends on your down payment:

5% to 9.99% down: 4.00% premium
10% to 14.99% down: 3.10% premium
15% to 19.99% down: 2.80% premium

On a $500,000 property with 10% down, the loan is $450,000 and the premium is $13,950. It is not paid in cash: it is added to your mortgage principal.

The QST on the premium: the amount nobody budgets for

Here is the Quebec specific that surprises buyers at closing every year. The premium can be added to the mortgage, but the tax on that premium cannot. QST at 9.975% applies to the premium and must be paid in cash at closing, at the notary.

Price	Down payment	Loan	CMHC premium	QST payable in cash
$400,000	5% ($20,000)	$380,000	$15,200	$1,516
$500,000	5% ($25,000)	$475,000	$19,000	$1,895
$500,000	10% ($50,000)	$450,000	$13,950	$1,392
$500,000	15% ($75,000)	$425,000	$11,900	$1,187

That amount sits alongside the welcome tax and the notary’s fees in your closing costs. Plan for it from the start with the closing costs calculator, otherwise it arrives at the worst possible moment.

The real calculation: what waiting costs you, or earns you

The question is not “20%, yes or no”. It is: while I save, what happens to the price of the thing I want to buy?

Take a $500,000 property today, and three years of saving to move from 10% to 20%. Here is what your target becomes depending on the market. These rates are assumptions, not forecasts: use the ones that seem realistic for your sector.

Annual appreciation	Price in 3 years	20% to save	Gap versus $100,000
0%	$500,000	$100,000	none
3%	$546,364	$109,273	$9,273 more
5%	$578,813	$115,763	$15,763 more

The mechanism is this: in a rising market, the 20% target rises while you save. That is what creates the feeling of running without moving forward.

And during those three years, had you bought, that same appreciation would have worked for you: $46,364 in equity at 3%, $78,813 at 5%. Compare that to the $13,950 premium you were trying to avoid.

In a flat market the trade-off reverses completely: waiting costs nothing in lost appreciation, and avoiding the premium becomes a net gain. That is why the answer cannot be the same for everyone.

What waiting also costs, and nobody counts

Rent paid while waiting. Three years at $1,800 a month is $64,800 that builds no equity. It is not wasted money, you were housed, but it leaves nothing behind.

Principal repaid. Every mortgage payment contains a principal portion that comes back to you. In the early years of a $450,000 loan that portion is modest but real, and it adds to your equity.

The interest rate of the moment. Nobody controls it. It can move either way and it often changes the picture more than the down payment does. The mortgage calculator shows you the effect of a one point difference on your monthly payment.

The two accounts that speed up a down payment

The FHSA. Up to $8,000 per year and $40,000 lifetime. Contributions are deductible from taxable income and withdrawals for a first home are tax free. It is the best of both worlds, and it is the first account to open if you do not have one.

The Home Buyers’ Plan. It lets you withdraw up to $60,000 from your RRSP, tax free, provided you repay over fifteen years. A couple combining both plans reaches the down payment far faster than by saving in an ordinary account.

When 20% really is the right answer

The rule is not wrong, it is simply misapplied. It makes sense in these cases:

Flat or declining market. Without appreciation, waiting no longer costs you an opportunity.

Variable or uncertain income. Self employment, commissions, contracts. A larger down payment reduces the payment and gives you room to breathe.

Buying at the edge of your capacity. If the payment absorbs an excessive share of your net income, the fragility is real and the premium is not the actual problem.

Significant existing debt. Paying off high interest debt often returns more, and with certainty, than buying sooner.

The method, in four questions

What is my actual minimum down payment for the price I am targeting?
What premium and what cash QST does that imply?
How long do I need to reach 20%, and where will the price be by then?
What monthly payment do I carry comfortably, not at maximum?

The affordability calculator answers the fourth and frames the other three.

The bottom line

For a first time buyer with stable income, a solid emergency fund and realistic expectations, buying with 5 to 10% down is often better than waiting three years. For a buyer stretching to the limit or with uncertain income, waiting and consolidating is the right call.

The inherited rule does not tell those two people apart. The calculation does.

Want to model the actual numbers for your situation? Let’s run the calculation together.