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Mortgage versus renting: the honest maths behind the old argument
Buying versus renting without the ideology: the real cost columns, the hidden entries on both sid
"Renting is dead money" is the most repeated sentence in personal finance and one of the least examined. Renting pays for housing; so does mortgage interest. The honest comparison is arithmetic with long columns on both sides — here are the entries that actually decide it.
The real cost of buying
The mortgage payment is the smallest confusion. The full buying column: interest (in early years, most of each payment — see the amortisation explainer), property taxes, insurance (the home-insurance guide prices this line), maintenance — a rule of thumb of around 1% of the home's value a year, and roofs do not negotiate — transaction costs on both ends (the fees explainer), and opportunity cost: the deposit and every extra payment could instead be invested, compounding at market rates. That last column is the one the "dead money" argument never prices.
The real value of buying
The buying column is not empty either. Principal repayment is forced saving — equity building whether you feel disciplined or not. Payment stability: a fixed-rate mortgage locks the biggest housing cost for decades while rents reset upward — in an inflationary decade this is worth a great deal, as the inflation guide explains from the other side. Control: no landlord, no non-renewal, and the freedom to renovate. And the price-gain upside — which cuts both ways, since prices fall too, with leverage amplifying both directions.
The few numbers that decide it
Strip the ideology and three variables do most of the work. Price-to-rent ratio: when a year's rent is far below a year's interest-plus-costs on the same property, renting wins on pure arithmetic — and vice versa. Horizon: transaction costs make buying a losing trade inside roughly five years almost anywhere; past a decade they amortise away. Stability of both: a fixed mortgage is a known quantity; your future rent and your future income are forecasts. The honest process: total both columns over your actual expected horizon with the payment calculator for the buying side, and treat any five-point difference as noise — life circumstances (mobility, space, family) should break the tie when the maths is close.
The honest summary: neither renting nor buying is generically "dead money" — each is a bundle of costs and options, and the bundle prices differently by market, horizon and interest rates. Do the arithmetic for your five-to-ten-year case, respect the transaction costs, and remember the biggest financial risk is not the wrong tenure choice but a housing cost — either kind — that leaves no room for the emergency fund.
Sources and further reading
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