Asymmetric Finance

Asymmetric Finance

The 5% Rule

your house is an expense

Aug 12, 2026
∙ Paid

A few days ago I argued about this with a friend (I wrote about it). He’s convinced buying is the only sane move. I tried to explain why the numbers, when you actually look at them, don’t always agree.

He didn’t buy it.

Then over lunch I told my father-in-law I was considering renting a bigger place with Elena instead of buying another property. The reply came without thinking.

“But son, renting is throwing money away. Yours, at least, is savings.”

I nodded. But that sentence is where the problem starts. It contains a mistake. An expensive one.

Rent is money that leaves and never comes back. True. What almost nobody calculates is that buying a home also has a portion of money that leaves and never comes back. And in most major-city markets, that portion is bigger than the equivalent rent.

Canadian portfolio manager Ben Felix put numbers on that invisible portion. He called it the 5% Rule.

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