In Melbourne, “affordable” is everywhere. It’s in real estate listings, government announcements and planning documents. Yet thousands of families who read it can’t reach the homes it describes. Rents have climbed fast and vacancies are scarce, so the question is a fair one: why does the official meaning of “affordable” feel so far from the reality of paying rent and still putting food on the table?

This isn’t just an argument about words. When the definition is loose, the real crisis gets hidden. Single parents, older women, people on income support and their children are left closer to homelessness than the figures suggest. To see why so many Victorians are being priced out of their own city, it’s worth looking at the yardsticks meant to protect them.

The 30% rule is showing its age

For decades, Australia’s main test of housing stress has been the “30:40 indicator“. The Australian Housing and Urban Research Institute (AHURI) explains it like this: a household is in housing affordability stress if its income is in the bottom 40% and it spends more than 30% of its gross income on housing costs. The Australian Institute of Health and Welfare (AIHW) uses much the same benchmark.

The rule has real strengths. It’s simple, it lets researchers compare data over time, and the “40” part stops high earners who choose expensive homes from being counted as “stressed”. But it has two weak points that matter more each year.

First, it’s a ratio, not a measure of what people have left. 30% of a high income leaves plenty to live on. Thirty per cent of a very low income may not leave enough for groceries, power, medicine and school costs. A household paying 29% isn’t automatically fine, and one paying 31% isn’t automatically in crisis.

Second, the pressure on that 30% line has grown sharply. The National Housing Supply and Affordability Council’s State of the Housing System 2026 report found that the share of median household income needed to rent a home on a new lease had reached an all-time high of 33%. That’s for a household on a median income. For people on much lower incomes, the share is far higher.

Two meanings of one word

Much of the confusion comes from “affordable” being used in two different ways.

The first is a general idea. AIHW describes affordable housing as housing priced so that, once housing costs are paid, people can still meet their other basic living costs. That’s a sensible, human-centred idea.

The second is a specific product. AHURI separates social housing (public and community housing, mostly for people on very low incomes, often after homelessness or family violence) from affordable housing, which usually means below-market rents for low to moderate-income households. In practice, “below market” is often set as a discount on local market rent.

The problem is clear once you put the two side by side. If market rents in a suburb have risen steeply, a property let at a discount to that rent can still take a huge share of a low income. On paper it counts as “affordable”. In someone’s household budget, it isn’t.

Australia also has no single national definition. That gap has now reached Parliament. In 2026, independent MP Nicolette Boele introduced a bill for a national definition. Its explanatory memorandum describes affordable housing as housing rented to an eligible household at an affordable rent and managed by a community housing provider. Supporters say a consistent definition would finally make the shortfall measurable. 

Whether the bill passes, and in what form, is still uncertain. But the fact that it’s needed tells us a lot: when terms differ between jurisdictions, programmes and developers, it’s very hard to judge whether “affordable” homes are actually reaching the people who need them.

What the numbers miss

Headline measures count households that have a home. They can’t fully capture the people who have already been pushed out, or those holding on by giving things up.

The Salvation Army’s Homelessness Report 2026 noted that 289,000 people were supported by Specialist Homelessness Services, and stressed that much homelessness stays hidden. 

Mission Australia’s response to the 2026 Report on Government Services pointed to rising rental stress, long social housing waitlists and unmet need for homelessness support.

Behind those figures are trade-offs that a 30% ratio can’t show: skipped meals, heaters left off in winter, prescriptions not filled, a child missing an excursion. A household can meet the official affordability test and still be one car repair or one dental emergency away from rental arrears.

Who gets left behind?

While everyone is suffering from the housing and cost of living crisis, certain groups are getting hit far worse than others.

People on income support

For people relying on JobSeeker, the Disability Support Pension or other payments, the gap between “affordable” and achievable is widest. Commonwealth Rent Assistance helps, but it doesn’t close the gap in a tight Melbourne market. Discounted-market rents still assume an income many people on payments simply don’t have. For them, social housing is often the only option that’s truly affordable, and the waitlists are long.

Single parents

A single parent pays the same market rent as a couple, on one income. They also face limits that rarely show up in affordability calculations. They need to stay near their children’s school, childcare, work and support networks. Moving further out to save on rent can mean higher transport costs, longer days and less time with the children. Where a home is located is part of what it costs, but the 30% rule doesn’t count that.

Many single parents, mostly mothers, are also leaving family violence. For them, safe and stable housing is often what decides whether leaving is possible at all. When “affordable” options are out of reach, some women face an impossible choice between safety and shelter.

Older women

Women over 55 are among the fastest-growing groups experiencing homelessness in Australia, as reporting connected with Launch Housing has highlighted in 2026. The causes build up over a lifetime: the gender pay gap, years out of paid work for caring, lower superannuation, and separation or widowhood later in life. Many have never been homeless before. Their homelessness is often hidden, in spare rooms, on friends’ couches or in cars, so they’re easy to miss in the statistics and slow to reach services.

Children

Children don’t sign leases, but they live with the results. Frequent moves can mean changing schools, losing friendships and losing trusted teachers. Overcrowding makes homework and sleep harder. Financial stress at home is hard to hide from children. Housing insecurity in childhood can affect learning, health and wellbeing long after a family finds stable housing again. That’s why prevention matters so much.

A better question is, what’s left after the rent?

Many researchers and advocates argue for adding a residual income approach to how affordability is measured. Instead of asking “What share of income goes on housing?”, it asks “After housing costs, does this household have enough for a basic, decent standard of living?”

Here’s a simple, made-up example to show the difference. Two households each spend 30% of their income on rent. One earns a comfortable salary and has plenty left for food, bills and savings. The other lives on a low fixed income and, after rent, can’t cover groceries, power and transport. The ratio says they’re in the same position. The residual income test shows they clearly aren’t.

The approach has its own problems. Someone has to decide what counts as a “basic” budget, and that involves judgement. Costs differ by household size, health needs and location. It also needs more detailed data than a simple ratio. These are real issues, but they can be worked through. Researchers already build budget standards for different household types. The bigger point is that a measure built around what people need to live will show hardship that a measure built around market rents can hide.

Why the definition matters for homelessness

How housing affordability is defined affects where money goes, what gets built and whose needs are counted. If “affordable” mostly means a discount on market rent, programmes can report success while people on the lowest incomes see little change. If affordability is linked to incomes, especially the incomes of people on payments, single-parent families and older renters, shortfalls are harder to ignore.

Homelessness is often seen as a sudden event. For many people it’s the end of a long squeeze: rent rises that outpace income, a lease that ends, a move that disrupts a child’s schooling, a relationship that becomes unsafe. Each step is a chance to step in. Honest measures help services and governments spot those chances earlier.

What this means for Melburnians

For readers, there are a few practical points to take away:

• Ask what “affordable” means each time you see it. Is it social housing, a discount on market rent, or a rent linked to income? The answer makes a big difference.
• Look past the ratio. When you read about housing stress, ask what households have left after paying rent.
• Get help early. Anyone in Victoria worried about losing their home can contact specialist housing and homelessness services before things reach crisis point. Early support with rent arrears, tenancy rights or family violence can often keep people housed.
• Join the conversation. Public consultations, submissions to inquiries and local council planning processes all shape how affordable housing is defined and delivered.

“Affordable” should be a promise in Australia. In a wealthy city, a family on a modest income can keep a safe, stable home and still live with dignity. At the moment, the word too often describes a price point rather than a life someone can actually manage.

Changing the definition won’t build a single home. But it would make the gap impossible to hide, and that’s where real progress starts. Measuring affordability by what people have left after the rent, and putting the lowest incomes at the centre of housing policy, would bring Melbourne closer to a system where no child, parent or older woman has to choose between a roof and a meal.

Supporting MOSS

We’re MOSS, and since 1989 we’ve supported vulnerable Victorians experiencing homelessness or housing vulnerability. As a not-for-profit, community-based service, we help men, women and children find stable housing, keep their tenancies and build connections that leave them feeling welcomed, secure and supported.

You can help us end homelessness. Every donation over $2 is tax-free, and helps us run programs for people who are experiencing homelessness or are at risk of it. You can also volunteer your professional skills or set up payroll giving through your workplace. To find out how you can get involved, contact us today!