Key takeaways
The price-to-income ratio oversimplifies housing affordability. It only compares median house prices with median household incomes, ignoring many other factors that actually influence affordability.
The “median household” doesn’t buy the median property. Different buyers compete at different price points, with first-home buyers, upgraders and high-income households all operating in separate segments of the market.
Household incomes and living patterns have changed. Most homebuyers today are dual-income households, which increases borrowing capacity and makes historical price-to-income comparisons less meaningful.
Interest rates and credit availability matter more than prices alone. Mortgage repayments depend heavily on interest rates and lending conditions, which directly influence how much buyers can borrow and afford.
Structural factors support higher price levels in Australia. Strong population growth, housing shortages, land constraints and a stable banking system mean Australia can sustain higher price-to-income ratios than many other countries.
Every time the housing affordability debate heats up, the same statistic gets wheeled out : the price-to-income ratio.
You’ll see headlines declaring that housing is now “more unaffordable than ever” because the median home price is eight or nine times the average household income.
At first glance, that sounds alarming. And it’s easy to see why people jump to the conclusion that property prices must be wildly overvalued.
But here’s the problem.
The price-to-income ratio is one of the most commonly quoted housing statistics… yet also one of the most misunderstood.
In fact, when economists and housing analysts dig deeper, they find that this single metric misses many of the forces that actually drive housing markets.
It ignores interest rates, borrowing capacity, deposits and equity.
And it ignores the way households and housing itself have changed over time.
So while the price-to-income ratio might make for a dramatic headline, it doesn’t tell the full story of what’s really happening in Australia’s housing market.
Let me explain why.
The simplicity that makes the metric misleading
The price-to-income ratio simply compares the median house price with the median household income.
For example, if the median dwelling price in a city is $900,000 and the median household income is $110,000, the ratio would be roughly eight.
The higher the ratio, the less “affordable” housing is assumed to be.
Australia’s ratio has certainly risen over time.
Cotality’s Housing Affordability Report estimates the national dwelling value to income ratio at about 8.2 at the end of last year, compared with a long-term average closer to 6.8.
But the simplicity of this measure is exactly what creates the problem.
It treats housing affordability as if it’s purely a function of prices and wages, yet in reality, housing markets are far more complex than that.
And when you start looking at the variables the ratio ignores, the picture changes dramatically.
The “median household” doesn’t actually buy the median house
A major flaw in the price-to-income ratio is that it compares the median income with the median house price.
But that’s not how real housing markets operate.
Not every household is competing for the median-priced property.
First home buyers typically enter the market below the median price. Upgraders often bring equity from an existing home. And high-income households tend to compete for premium properties.
In other words, the buyers at each price point in the market have different financial profiles.
Comparing an “average” income with an “average” property therefore creates a misleading impression of who is actually buying homes.
Household incomes have evolved
There’s another reason why simple comparisons between prices and incomes can be deceptive.
Households themselves have changed dramatically.
A generation or two ago, many households relied on a single income. Today, most homebuyers are dual-income households.
Two incomes obviously increase borrowing capacity.
So when we compare today’s house prices with historical income levels without adjusting for this shift, we’re not making a like-for-like comparison.
Homes themselves are very different today
Another often overlooked factor is that the homes Australians live in today are vastly different from those of previous decades.
Modern homes tend to be larger, better designed and more energy efficient.
They include multiple bathrooms, larger kitchens, better insulation, improved materials and often advanced appliances.
In other words, buyers today are paying for a different and generally higher-quality product than previous generations.
Comparing prices across decades without accounting for these improvements can exaggerate how much affordability has deteriorated.
Interest rates matter far more than prices
If there’s one factor that determines housing affordability more than any other, it’s interest rates.
Yet price-to-income ratios ignore them completely.
What matters to a buyer isn’t just the price of the property - it’s the size of their mortgage repayment.
And mortgage repayments are heavily influenced by interest rates.
For example, a buyer taking out a $700,000 mortgage at 3 percent interest may face a similar monthly repayment to someone borrowing about $500,000 at 7 percent.
In other words, a higher-priced home with low interest rates can actually be just as affordable as a cheaper home with high rates.
This is why economists often prefer to examine the cost of servicing a mortgage as a share of income, rather than simply comparing house prices with wages.
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When you look at affordability through the lens of repayments rather than prices, the conclusions can be very different.
Credit availability drives housing markets
Another big driver of property prices is something price-to-income ratios completely overlook is availability of credit.
Housing markets are heavily influenced by borrowing capacity, which is determined by interest rates, lending rules and bank policies.
When interest rates fall or lending standards loosen, borrowing capacity increases. Buyers can bid more, and prices tend to rise.
Conversely, when rates rise or lending restrictions tighten, borrowing capacity falls and price growth slows.
This dynamic has been clearly visible in Australia’s housing cycles over the past two decades.
Prices move with credit conditions as much as they move with incomes.
Equity and deposits change the equation
Another limitation of the price-to-income ratio is that it assumes buyers are starting from scratch, but in reality many buyers are not.
Large numbers of purchasers already own property and are upgrading using the equity from their existing homes.
Others receive assistance from the so-called Bank of Mum and Dad which has become a major source of deposits for first home buyers.
These factors mean that the simple comparison between prices and income doesn’t reflect the actual financial resources buyers bring to the market.
Supply shortages are another real driver
Another important factor missing from price-to-income ratios is supply and demand.
Australia has been experiencing a structural housing shortage for years.
Population growth, particularly through migration, has consistently outpaced the number of new homes being built.
When more people want homes than there are homes available, prices inevitably rise.
That dynamic would push prices higher even if incomes remained unchanged.
Why Australia can sustain higher price-to-income ratios than many countries
There’s another important reason the price-to-income ratio can be misleading.
It assumes every country’s housing market should operate at roughly the same ratio. But housing markets don’t work that way.
Different countries can sustain very different price-to-income levels depending on their financial systems, population growth, land constraints and housing policies.
And Australia happens to have several structural characteristics that allow for higher ratios than many other markets.
First, Australia has one of the most stable banking systems in the world, with conservative lending standards and full-recourse mortgages. This means borrowers remain responsible for their debts even if property prices fall, which reduces systemic risk in the housing system.
Second, Australia has experienced strong population growth for decades, largely driven by migration. When population growth consistently exceeds new housing supply, prices tend to rise faster than incomes.
Third, our major cities have significant geographical and planning constraints. Cities like Sydney and Melbourne are bounded by oceans, mountains, national parks and zoning restrictions that limit how quickly housing supply can expand.
These constraints mean that well-located land is inherently scarce.
Another factor is the structure of Australian households. Dual-income households are common, and the tax system encourages long-term property ownership through policies such as negative gearing and the capital gains tax discount.
Taken together, these factors mean the Australian housing market operates differently from many overseas markets.
So when commentators compare Australia’s price-to-income ratios with other countries and declare our housing “unsustainable,” they’re often missing the structural drivers that support higher valuations.
And history shows that predictions of imminent housing crashes based solely on this ratio have repeatedly proven wrong.
The real lesson for investors
If you’re serious about building wealth through property, you need to look beyond simplistic metrics and media narratives.
Successful investors don’t make decisions based on headlines. They focus on the underlying fundamentals that drive long-term capital growth.
They understand the impact of demographics, the role of supply shortages, and the importance of selecting investment-grade properties in locations with strong long-term demand.
In other words, they take a strategic approach to property investment rather than a reactive one.
And that’s exactly what we help our clients do at Metropole.
Want clarity about your next property move?
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