The price-to-rent ratio, and what it tells you about buying

Price-to-rent is a property's price divided by the annual rent it would command. A house worth $400,000 that would rent for $2,000 a month has an annual rent of $24,000 and a ratio of about 16.7.

It is the most useful single number for comparing buying against renting in a specific place, because both sides come from the same local market.

Reading the number

There are no hard thresholds, and anyone quoting them precisely is overreaching. But the broad picture holds:

• Low ratios, roughly under 15. Buying is cheap relative to renting. Rent covers a lot of the cost of ownership. Common in areas with slower price growth, higher property taxes, or weaker demand.
• Middle ratios, roughly 15 to 20. Buying and renting are broadly comparable once all costs are counted, and the decision turns on how long you will stay and how you value control.
• High ratios, above roughly 20. Renting is cheap relative to buying. Owning only wins if prices keep appreciating, because current rent is not covering the cost of ownership. This is the situation in most expensive coastal cities, and it means buying there is a bet on appreciation, not a hedge against rent.

A high price-to-rent ratio does not mean do not buy. It means be clear that you are buying appreciation, not cash flow, and that the bet can go wrong.

What it captures that rules of thumb do not

Affordability rules, three times income, twenty-eight percent of gross, tell you what you can borrow. They say nothing about whether buying is a good deal in that particular market. Price-to-rent does, because it prices the same shelter two ways in the same place at the same time.

It also travels well. It works in Manchester and in Phoenix without adjustment, which is unusual for a property metric.

What it leaves out

Quite a lot, and the omissions matter.

• Interest rates. The same ratio is very different at 3% and at 7%, because the cost of ownership is largely the cost of money. A ratio compared across time without accounting for rates will mislead you.
• Property taxes and running costs, which vary enormously and fall entirely on the owner. A ratio of 16 in a high-tax jurisdiction can be worse than 19 in a low-tax one.
• Transaction costs. Buying and selling costs, several percent each way, are why short holding periods usually favour renting regardless of the ratio.
• Leverage. A mortgage magnifies both appreciation and loss, and the ratio is silent on it.
• Everything non-financial. Security of tenure, the freedom to change things, and not being asked to leave. These are worth real money to most people and appear nowhere in the arithmetic.

How to use it honestly

Calculate it for the specific property you are considering, using a realistic rent for that property rather than an area average. Compare it against the same figure for the same area a few years ago, and against other areas you would consider.

Then use it to name your bet. If the ratio is low, you are broadly paying to own something that also roughly covers its costs. If the ratio is high, you are paying a premium now in exchange for expected appreciation and for the things ownership gives you that renting does not. Both can be sensible. Only one of them survives a flat decade in prices, and it is worth knowing which one you signed up for.