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Rent vs. buy is the wrong question

The classic rent-vs-buy calculator stages a duel: project both paths, compare terminal net worth, declare a winner. It's a fine exercise, and this site's model runs it internally. But as the question that decides whether you buy a specific house at a specific price, it misleads in three distinct ways.

It answers on average, and you don't live on average

"Buying beats renting in 62% of scenarios" sounds decisive. It says nothing about the other 38% — and, crucially, nothing about how bad they are or when they bite. Renting's bad futures are mostly "you end up with a somewhat smaller portfolio." Buying's bad futures include "a layoff lands in a crash two years after closing and you sell the house into a down market." Averaging across futures hides exactly the asymmetry a buyer should care about. The decision-grade question is about the tail: at this price, what fraction of futures break the plan, and what breaks them?

The verdict flips with the price — so price on the verdict

Rent-vs-buy is framed as a tenure choice, as if "buy" were one option. But buy what? For most households, buying at $450,000 handily beats renting while buying the $750,000 version of the same decision loses badly — same city, same rate, same household. The tenure comparison collapses this whole spectrum into a binary. Inverted, the question becomes useful: find the price at which buying stops being safe, and treat that as your ceiling. That's a number you can act on — see how it moves across price and salary combinations.

Net worth is the wrong scoreboard

Terminal net worth treats a dollar of home equity as equal to a dollar of index funds. For the thing most people are actually protecting — the option to stop working — they aren't equal: you can't spend the house without moving out of it. A housing-aware independence target counts what you can actually draw on: investable assets, scored against a threshold that, while you own, also covers property taxes, insurance, and upkeep — and drops once the mortgage is gone. That reframing captures the real long-term appeal of owning that rent-vs-buy tallies blur: a paid-off house permanently shrinks the portfolio you need, because rent — which grows forever — leaves your retirement budget, replaced by carrying costs alone. Owning is partly insurance against rent growth, and it prices like insurance: you accept worse tail risk early (see sequence risk) for a cheaper, more predictable later life.

The question worth asking

Not "does buying beat renting?" but: at what price does this purchase keep my odds of financial independence by my target age acceptably high — and how does it break when it breaks? That's the question the simulator is built around. Rent-vs-buy survives inside it as a secondary lens — useful context, wrong headline.

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