Renting vs. Buying: The Opportunity Cost Myth

It's one of the most repeated phrases in personal finance: 'renting is throwing your money away.' But rent buys you something real — shelter, for a fixed and known cost, with none of the obligations of ownership. The real question isn't whether renting has a cost. It's whether buying is actually cheaper once every cost is counted.

Buying a home requires a down payment — often tens of thousands of euros — that could otherwise be invested in a diversified portfolio. If that capital would have earned a 7% average annual return in the market, that forgone growth is a real cost of buying, even though no invoice is ever issued for it.

This is the opportunity cost myth in reverse: renters aren't the only ones giving something up. Buyers give up the market returns on their down payment, every single year they own instead of rent.

Mortgage interest is only the beginning. Property tax, insurance, maintenance (typically 1–2% of home value annually), and closing costs on both purchase and sale all erode the apparent advantage of 'building equity' instead of 'paying rent.'

None of this means buying is wrong — only that the comparison has to be run honestly, with both sides' true costs on the table.

The only reliable way to know which option wins in your specific city, at your specific price point and time horizon, is to model it directly — comparing total cost of ownership against rent plus the invested opportunity cost of the down payment, over your expected holding period.