When 20% Down Isn't the Smart MoneyA Calgary business owner's down-payment decision

A client came to me ahead of a $724,000 home purchase. Like most people, he'd absorbed the rule of thumb that you put 20% down to avoid CMHC mortgage insurance, and on paper he had the net worth to do it. In reality the picture was more complicated — and the “obvious” move would have quietly cost him a fortune.

As of early May 2026, his capital sat across four buckets:

• Cash — ~$23,600
• TFSA — ~$64,600
• RRSP — ~$124,300
• Corporation — ~$72,700

Twenty percent down on a $724,000 home is $144,800. He had more than that in total, so where's the problem? The problem was liquidity, not net worth.

Only a portion of his capital was actually free to deploy, and we used everything that wasn't tied up: about $21,600 of cash and $36,400 of liquid TFSA, for a $58,000 down payment — roughly 8%. The rest of his TFSA was invested in holdings that couldn't be cashed in time for closing.

That left two buckets that looked available but came with strings attached: the RRSP and the corporation.

The corporate investments were locked instruments too — but with one important difference. A buyer was willing to purchase those holdings at par. He could exit them at full value, with no penalty and no capital loss to break them. That clean exit is the only reason “use the corporation” was even on the table; the TFSA holdings were stuck, but the corporate holdings were genuinely realizable.

So the real decision was how to bridge from $58,000 to $144,800 — an extra $86,800:

1. Accept CMHC and finance the premium. Put down 8%, insure the mortgage, and roll the premium into the loan.
2. Withdraw from the RRSP. Fully taxable as income, with the contribution room gone forever.
3. Break the corporate investments. A clean exit at par with no sale loss — but the capital leaves the corporation.

I told him to take the first route: put down the $58,000, accept the CMHC premium, and leave the RRSP and the corporation alone.

Here's the math behind the call. The CMHC premium worked out to about $26,640 — 4% of the insured loan — and it gets financed into the mortgage rather than paid in cash. There's no provincial sales tax on it in Alberta, carrying it adds only a modest amount per payment, and it shrinks every year as the loan is paid down.

Now compare that to the cost of “saving” it. The RRSP route would have triggered tax on a large withdrawal and permanently destroyed contribution room he could never rebuild — at a realistic marginal rate, funding the gap would have consumed nearly his entire RRSP after tax. The corporate route, even with a clean exit at par, pulls roughly $73,000 of capital out of a tax-deferred corporate structure where it had been compounding, and the corporation on its own couldn't even cover the full gap.

The premium was a one-time, financed cost of about $26,640. The alternative was sacrificing the long-term compounding on roughly $197,000 of registered and corporate capital — money that, left alone, has decades to grow. Saving the insurance simply wasn't worth what it would cost to save it. And the fact that the corporate money could be broken cleanly didn't change the answer: a clean exit still removes the capital from the runway that makes it valuable in the first place.

Advice like this is easy to say and harder to feel. So I built the whole comparison into an interactive model — the one embedded below — and stood it up on the site so he could see it for himself: the premium sitting beside the tax bill, and the two capital paths diverging over the years. Within the same conversation he went from “but everyone says 20%” to seeing, plainly, that paying the insurance was the sound choice.

That's the difference between a rule of thumb and a plan — and being able to show it, on the spot, is a big part of how I work.

This is a real planning scenario presented for illustration, with client details anonymized. The figures are specific to this client's circumstances and are not a recommendation for any reader. CMHC premiums, mortgage rates, and tax outcomes change and depend on your own situation — speak with a qualified advisor before acting. Maple Groove Financial · Calgary, Alberta.