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Underwriting5 minute read

Rent versus buy: a more honest model

The familiar price-to-rent ratio omits financing, maintenance, taxes, and the opportunity cost of capital.

The traditional ratio is only a starting point

The standard price-to-rent ratio divides a home’s purchase price by the annual rent of a comparable property. A $385,000 home renting for $2,300 per month produces a ratio of roughly 14, which can make buying appear attractive.

But almost no buyer evaluates the home as an all-cash purchase. Once financing enters the analysis, the headline ratio no longer describes the household’s actual economic choice.

Model the full cost

A more complete comparison includes mortgage principal and interest, property taxes, insurance, maintenance, transaction costs, and the return forgone on the down payment. Under a representative high-rate mortgage, those costs can make first-year ownership materially more expensive than renting even when the traditional ratio favors buying.

  • Mortgage principal and interest
  • Taxes, insurance, and expected maintenance
  • Opportunity cost of the down payment
  • Expected rent growth and holding period

Time can change the answer

A fixed mortgage payment remains comparatively stable while rents may rise. Principal amortizes, equity accumulates, and appreciation—if it occurs—compounds on the asset’s full value. The decision can therefore move from renting in the early years to owning over a longer horizon.

The useful question is not simply whether renting or buying is always better. It is when the cumulative economics cross over, how sensitive that result is to assumptions, and whether the buyer expects to remain in the property long enough to reach that point.

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