Renting vs. Buying a Home: The Actual Math
"Rent is throwing money away" is one of the most repeated — and most incomplete — sentences in personal finance. Owning a home also throws money away, just through different channels: interest, taxes, insurance, maintenance and transaction costs. The honest comparison is not rent vs. mortgage payment; it is rent vs. the unrecoverable costs of owning. Here is how to run that comparison properly. 01 . The costs owners actually never get back A mortgage payment mixes two very different things: principal (which builds equity — genuinely yours) and interest (gone forever). On top of interest, an owner pays property tax, homeowner's insurance, possibly PMI, and maintenance that industry rules of thumb put at 1–2% of the home's value per year. On a $400,000 house, those unrecoverable costs can easily total $20,000–28,000 a year — $1,700–2,300 per month — before a single dollar of equity is built. The renter's unrecoverable cost is simpler: the rent. If comparable homes rent for less than the owner's unrecoverable monthly cost, renting is — mathematically, that month — the cheaper way to put a roof over your head, and the difference can be invested. 02 . The price-to-rent ratio Divide a home's price by the annual rent of a comparable home. Below about 15, buying tends to win decisively; between 15 and 20 the decision is genuinely close and depends on your horizon and rate; above 20, renting usually wins on pure cash flow. In many prime metros the ratio sits above 25, which is why high earners in expensive cities often rent by choice, not necessity. 03 . Two factors that flip the answer Time horizon dominates. Buying and later selling costs roughly 8–10% of the home's value in fees, so short stays rarely recover them: under five years the odds favor renting, past seven to ten years they increasingly favor owning as fixed payments meet rising rents and equity accumulates. Opportunity cost is the silent variable. A $80,000 down payment invested at 7% grows to about $157,000 in ten years. Any honest rent-vs-buy model must credit the renter with returns on the capital they did not lock into a house — and credit the owner with the home's appreciation, historically around 3–4% per year in the U.S., on the full (leveraged) home value. 04 . What the slogan gets right anyway A fixed-rate mortgage is also a forced savings plan and a hedge against rent inflation: the payment is frozen for thirty years while rents drift upward. Behaviorally, many households save more as owners than they ever would as renters, and that discipline has real value even when the spreadsheet is a toss-up. The point of the math is not that renting is secretly better — it is that neither answer is automatic. Takeaway: Compare rent against the unrecoverable costs of owning — not against the whole mortgage payment. Plan to stay five-plus years, check the price-to-rent ratio, and account for what your down payment could earn elsewhere. Then the right answer is usually obvious.