The Adelaide Housing Divide, 1980–2026

The earlier version of this brief estimated historical incomes by scaling the 2011 Census back with national earnings. The actual Census medians are higher in the early years ($27,849 a year in 1991), so the 1990 ratio is about 3.6×, not 4.1×. The real rise is steeper than first estimated. Two independent series bracket this brief’s 2026 estimate of 10.2×: Cotality puts Adelaide houses at 9.8× income in September 2025, and Demographia’s 2026 edition at 11.2×.[28, 29]

This brief uses Cotality’s September 2026 Adelaide house median of $990,531, rounded to $991,000. Other measures sit a little lower: the SA Valuer-General’s September-quarter sales median was $950,000, ABS transfers put the June quarter at $975,000, and Cotality’s October figure eased to $977,551 as values came off their May peak.[56, 2, 48, 30]

The standard rate was 17% from June 1989 to March 1990, ten months in all. It was below 12% by early 1992 and under 10% by August 1992. A June 1990 buyer started with repayments of about 48% of household income. Rates fell and wages rose (average hourly earnings grew 8.5% in the year to June 1990), so within three years the same loan took under 28%.[9, 32]

A 2026 buyer of the median house starts at 64% of income and, on a steady 3.4% wage path, is still paying 46% after ten years. Inflation is lower now, so it erodes the debt more slowly. The 6.70% rate is the August 2026 average for new variable loans (6.2%) plus the RBA’s two 0.25-point rises since, on 30 September and 3 November, which took the cash rate to 4.85%.[9, 31]

In 1990, 16% rates put the median house beyond a median household’s reach. As rates fell, reach caught up by 1994, pulled clearly ahead from 1997 and stayed ahead until 2002. Then prices rose through it. The gap closed only once, in 2020, when rates hit record lows; prices then rose 17% in 2021 and 36% over two years. Today the median household can service a purchase of about $468,000; the median house is $991,000.

This matches RBA research. In 2003 the Bank noted that lower rates had let households borrow about 3.7 times income, against about 2 times in the mid-1980s, and named borrowing capacity as the main driver of prices.[33] RBA modelling finds a sustained 1-point fall in rates raises prices by about 17% in the long run, and that lower real rates explain most of the post-2011 boom.[34]

$991,000 less a $198,200 deposit leaves a $792,800 loan, or $5,116 a month at 6.70%. For that to be 30% of gross income takes about $204,631; at 40%, about $153,473. The estimated median Adelaide household earns about $96,600 before tax, so the repayment would take 64% of it.[5, 7, 9, 56]

Median new-lease rent rose from $345 to $580 a week between June 2020 and June 2026, an extra $12,220 a year. Over the same period the SA wage index rose 20%. Cotality now ranks Adelaide the least affordable capital to rent in: median rent takes about 35.5% of median household income, up from 26.9% in March 2020.[37, 29]

The fall is steepest for young people on lower incomes: among 25–34-year-olds in the lowest income fifth, ownership dropped from 63% in 1981 to 23% in 2016, while the highest fifth fell only from 62% to 55%. That pattern points to price, not preference. Renting among 25–39-year-olds rose from 30% in 1991 to 43% in 2021.[50, 11]

Buyers are also older and more reliant on family. The median first home buyer was 27 in 1981–82 and 32 by 2000–01; by 2017–18 the average was 35–36. The share of first home buyers helped by family rose from about 6% in the 1970s to about 14% by 2011–15, and a $10,000 parental transfer raises the chance of buying a first home by about 90%.[53, 50, 55]

The 1990 buyer who kept paying $1,073 a month spent on average 44% of gross income on the mortgage for ten years, and owned the house outright by mid-2000. A 2026 buyer of the median house spends 55% on average over the same ten years and still owes about $675,000, or 85% of the loan. Copying the 1990 strategy by paying 20% above the minimum would take 76% of a median household’s gross income in the first year, which is not realistic.

Paying off at 40 left about 27 working years before Age Pension age with no housing cost: years to build super, invest, help children, cut hours or retire early. A first home buyer at 36 on minimum repayments is still paying at 66. Paying 20% extra would clear the loan at about 55, if the household could find 76% of its income to do it.

The 1990 median house bought for $97,200 is now worth about $991,000. That $893,800 gain, about $731,000 after inflation, equals 9.3 years of today’s median household income. It came from timing, not from work: a family home is generally exempt from capital gains tax and is not counted in the Age Pension assets test. Investing the freed repayments would have turned $338,000 of contributions into about $697,000 more.

The advantage passes down. Housing equity is what funds the “bank of mum and dad”: the share of first home buyers helped by family rose from about 6% in the 1970s to about 14% by 2011–15, and a $10,000 parental transfer raises the chance of buying a first home by about 90%. Children of renters do not get that help. The Productivity Commission found people aged 60 and over held 31% of the wealth of adults aged 30 and over in 2002, and projects 67% by 2048.[50, 55, 57]

Missing out has a cost in old age too. Australia’s retirement system assumes people own their home by retirement, yet the number of households aged 65 and over who rent rose from about 140,000 in 1984 to about 440,000 in 2019–20.[12]

These are scenarios. They assume the household kept its income and its home; the early-1990s recession cost many households both. A 1990 median house is used as a proxy for today’s median, and past price growth says nothing certain about the future.

Every pay packet buys less house. In 1990 a full-time worker on the minimum wage needed 6 years of gross pay to match the median Adelaide house; now it takes 19. A registered nurse at the top of the first grade went from 3.7 years to 9.2, and a teacher at the top of the classroom scale from 2.5 to 8.0. The average South Australian full-time wage went from 3.6 years to 9.7. A house one earner could once buy now needs close to two incomes.

A household that started saving in mid-2020 and put away 20% of its gross income every year, while paying rent, would have about $102,000 by mid-2026. That is more than the whole 2020 deposit of $98,600. But the deposit on the median house is now $198,200, so the household is still about $96,000 short, the same gap it started with. The deposit grew by about $16,600 a year, roughly everything the household saved.

The cash needed up front has tripled relative to income. A 20% deposit plus stamp duty on the median house took about 10 months of median household income in 1990. It now takes about 31 months, more than two and a half years, before any other costs.

Stamp duty is part of that. South Australia’s lower duty brackets were set in 1985, higher rates were added in 2002, and none of the thresholds has moved since. Duty on the median house went from $2,732 in 1990 (2.8% of the price, about five weeks of household income) to $48,335 now (4.9%, about six months). About half of the rise in the rate is bracket creep alone: the 1990 scale applied to today’s price would charge 3.9%. A 2022 federal parliamentary committee urged the states to fix “decades of stamp duty bracket creep”.[74, 75, 78]

First home buyers have lost their break on established homes. In 1990 a South Australian first home buyer paid duty only on the value above $80,000, with no price cap, so a first buyer of the median house paid about $602. Today a first home buyer pays nothing on a new home but the full $48,335 on an established one.[76, 77]

Building a new house is no way out. The cost of building a house in South Australia rose 65% from early 2020 to late 2026, more than twice as fast as consumer prices (28%). Full-time earnings rose 29% and median household income about 26%, while the median house price doubled.

Pay is falling behind again now. Adelaide consumer prices rose 4.7% in the year to September 2026, while the national Wage Price Index rose 3.2% in the year to June 2026. The RBA expects real wages to fall about 1% over 2026.[10, 7, 31]

More people now reach retirement still paying off the house. In 1990 about 14% of home owners aged 55–64 still had a mortgage. By 2015 it was 47%, and ABS figures for 2019–20 put it at 54%; among owners aged 65–74 it was 16%. The median age at which Australians finish paying off their mortgage rose from 52 in 1981 to 62 in 2016.[64, 65, 66]

The debts are bigger too. Older mortgagors owed about $33,000 on average in 1990 and $186,000 in 2015 (both in 2015 dollars), which went from less than one year of their disposable income to more than two. In 2022–23, about a third of recent retirees who took a superannuation lump sum spent at least part of it paying off, improving or buying a home.[63, 67] That ties back to the head start above: the 1990 buyer was debt-free at 40, while a 2026 first home buyer on minimum repayments is still paying at 66.

Stress is back near its worst. Roy Morgan’s survey put 24.3% of South Australian owner-occupiers at risk of mortgage stress in late 2025, before this year’s rate rises, and modelled 26% after the first two. Nationally the share reached 32.5% in July 2026, the highest since 2008, and was 31.8% in September.[59, 60]

Renters are worse placed. In 2025, 35.9% of South Australian households on Rent Assistance still paid more than 30% of their income in rent after the assistance, and 39.3% in Greater Adelaide. Adelaide’s Rental Affordability Index fell from 127 in 2020 to 101 in 2024 and 2025, its lowest on record: the median rent now takes about 30% of a median renting household’s income, and far more for a single person on a pension or benefit.[61, 62]

None of these stress measures goes back to 1990. They show how hard the last few years have been, not the long-run change.

A household that bought when a home cost three to four times income took on less debt relative to earnings, saw the debt shrink quickly as rates and inflation fell, and then rode the price rise. Those advantages depended on buying, keeping the home and making the payments, and plenty of households in every generation did not.

Policy is part of the context. The May 2026 federal budget limits negative gearing to new builds and replaces the 50% capital gains discount with inflation indexation and a minimum tax, both from 1 July 2027; Treasury modelling, as reported, expects prices about 2% lower.[15, 45] The 5% Deposit Scheme’s Adelaide price cap is $900,000, below the median house.[46] South Australia has abolished stamp duty for first home buyers of new homes, but not established ones.[26]

The strongest conclusion: the mortgage rate is one part of the story, and in 1990 it was the part that fixed itself. The price-to-income gap is the part that has not.

Incomes. Median gross household income from each Census: Adelaide Statistical Division 1991 ($27,849 a year), 1996 and 2001 (interpolated within published ranges, about $576 and $697 a week), 2006 ($924 a week); Greater Adelaide 2011 ($1,106), 2016 ($1,265), 2021 ($1,548). Between Census years, geometric interpolation; 1990 is the 1991 figure less one year of earnings growth; 2022–26 extend 2021 by national full-time earnings growth. SA earnings grew faster than national, so the 2026 income may be understated by about 4%.

Loans. Monthly rate = annual rate ÷ 12; interest = opening balance × monthly rate. Payment = P × r ÷ (1 − (1 + r)⁻ⁿ). The 1990 burden path resets the minimum repayment over the remaining term at each RBA rate change. Duty applies SA residential brackets to the price rounded up to the next $100.

Limits. The price series changes source in 2003 and again in 2023–26, and Census boundaries changed in 2011. A median house and a median household are not the same buyer and home. National measures (debt, ownership, land share) describe a wider population than Adelaide. Nothing here is personal financial advice or a forecast.