Australia measures rent two ways. Advertised-rent indices — Cotality, Domain, SQM — measure the rent on newly listed tenancies. The ABS Consumer Price Index measures the rent paid across the whole occupied stock. This brief decomposes which renter each one describes.
Cotality's advertised-rent index rose 5.7 percent over the year; the ABS CPI rents component, which tracks the whole occupied stock, rose 3.7 percent. Both are rising — the gap is magnitude, not direction. One measures the new lease; the other measures every lease.
It is a sentence that lands on every renter in the country: rents rose, by a precise figure, over the year. The sentence sounds like a fact about renting in Australia. It is, more precisely, a fact about one population of renters within it — the people who signed a new lease.
Australia measures rent two ways. Advertised-rent indices — Cotality's Rental Review, the Domain Rental Report, SQM Research — measure the rent a property asks when it is newly listed. They track a flow: tenancies coming to market. The ABS Consumer Price Index rents component measures something larger — the rent paid across the whole occupied rental stock, sitting tenants included, most of them mid-lease or renewing. It tracks a stock.
This brief places the two on one sheet. The point is not that one is right. It is that the figure in the headline answers a specific question — what is a new lease costing? — and a reader who is mid-lease, reading it as what is rent doing?, has reached for the wrong number.
The advertised indices measure a small, fast-moving flow — the tenancies coming to market this quarter. The ABS CPI measures the large, slower-moving stock — every occupied tenancy. Both are rising. They rise at different speeds.
| Measure | Publisher | Samples | Annual growth |
|---|---|---|---|
| Advertised-rent index | Cotality Rental Review | Newly listed tenancies — the flow | +5.7% · yr to March 2026 |
| Asking-rent index | SQM Research | Newly listed tenancies — the flow | +7.3% · yr to ~May 2026 |
| Rental Report | Domain | Newly listed tenancies, by capital city | national houses A$680/wk, +2.3% quarter |
| CPI rents component | ABS — official | the whole occupied rental stock | +3.7% · yr to March 2026 |
Over the year to March 2026, Cotality's advertised-rent index rose +5.7%. SQM's asking-rent index, measured to May 2026, rose +7.3%. Over the same year-to-March-2026 window as Cotality, the ABS CPI rents component — the whole occupied stock — rose +3.7%. All three are rising. The divergence is one of magnitude: roughly two to three-and-a-half percentage points between the advertised-rent measures and the whole-stock measure. It is not a divergence of direction — every measure agrees rents went up.
That gap is not a contradiction to resolve. It is two true measurements of two different renter-populations: the tenant signing a lease this quarter, and the tenant who has been in place for a year or two and is only now renewing. The headline almost always quotes the first.
An advertised-rent index can only see a property the moment it is listed. The ABS CPI tracks a basket of occupied dwellings — sitting tenants included. The designs answer different questions, so they return different numbers.
“The CPI measures changes in the actual rental prices being paid by new and existing tenants. Measures of rental inflation that are based on newly advertised rental properties only measure changes in the asking or advertised price of rental properties for new tenancies.”
Neither design is the error. They sample different renters. The RBA describes the relationship between them plainly: advertised rents are a leading indicator of CPI rents. The new-lease number moves first; the whole-stock number follows behind it, lease by lease, as tenancies turn over. The space between +5.7% and +3.7% is, in effect, a pipeline — rent increases that have happened at the market's edge but have not yet reached most of the people in it.
At any given moment, most Australian renters are not on the market. They are mid-tenancy — a year, two years, into a lease, facing a renewal rather than a fresh search. The advertised-rent index does not measure them. It measures the minority who are listing or signing right now.
The number that tracks the sitting tenant is the ABS CPI rents component: +3.7% over the year to March 2026, +0.2% in the month of March. It is lower than the advertised figure not because it is more conservative by design, but because most of the stock it samples has not yet re-leased at the new market rate. As those tenancies renew, the advertised increases pass through — which is exactly why the RBA treats advertised rents as the leading indicator and CPI rents as the lagging, fuller measure.
For the renter, the practical reading is simple: the headline tells you what the market is asking; the CPI tells you what the market is, on average, still paying. Both are rising. They are not the same number, and for most renters the second is the nearer one.
AU-02 follows AU-01 inside The Australian Property Decode. The first brief decomposed how Australia measures the price of a house — three private indices, three methods, three numbers. The second decomposes how it measures the rent on one — a flow measure and a stock measure, two numbers.
The series asks one question of each published property figure: which population does this number actually describe? For the house price it was which sample of sales; for the rent it is which sample of tenants. The headline rarely says. The brief does.
General information only. The scenario below is a modelled illustration, built to make the data concrete — it is not advice, and it describes no real person, household, or transaction.
Picture a renter in a modelled outer-suburban tenancy, eighteen months in, a renewal letter due. They have been reading, all year, that rents are up nearly 6 percent — and they are bracing for it. The number has shaped how they think about the year ahead: a 6 percent rise on their rent is a real, planned-for sum.
But that 6 percent is the advertised-rent figure — the rent on a new lease, signed by someone entering the market today. It is not, mechanically, what a mid-tenancy renewal moves by. The measure that tracks tenancies like theirs — the ABS CPI rents component, the whole occupied stock — rose 3.7 percent. Both numbers are real; both describe rising rents. They simply describe different renters, and this modelled renter has been planning against the one that is not theirs.
The composite is illustrative — a modelled renter, not a survey of one. Its only purpose is to make the gap concrete: the distance between the advertised index and the CPI is not an abstraction. It is the difference between the rise a sitting tenant fears and the rise the whole-stock measure recorded. The brief offers no view on what this renter should do at renewal — only that they should know which rent number they have been reading.
If you read one thing: a rent headline almost always measures the new tenant. Before you read it as your rent, check whether it is the advertised-rent flow or the whole-stock CPI.
Australia's rent figure is not one figure. It is a flow measure — the advertised rent on newly listed tenancies, which Cotality put at +5.7% and SQM at +7.3% over the year — and a stock measure, the ABS CPI rents component, which put the whole occupied stock at +3.7%. All three are rising; they diverge by magnitude, not direction. Mirror Brief AU-02 makes one claim: the rent figure in a headline almost always measures the new tenant — read whether it is the advertised-rent flow or the whole-stock CPI before reading it as “the rent.” Every figure here is verbatim from a publisher's own release. The brief alleges nothing against Cotality, SQM, Domain, or the ABS — each measure is correct for the renter-population it samples.
Mirror format — RAOSCAFF anchors on the publishers' own released figures (Cotality, SQM, ABS, Domain), places the advertised-rent measures beside the whole-stock CPI measure, and decomposes the sampling design that makes them diverge. No primary data collection, no analyst estimate, no extrapolation.
Every figure traces to a Q1 / March-quarter / March-2026 publisher release, fetched live on 21 May 2026 by Phase 0. The ABS CPI rents component and the Cotality Rental Review were read as primary sources; the Domain Rental Report is cited via named press coverage that names the report (Domain blocks automated retrieval); SQM Research figures are cited as confirmed via named secondary coverage of the SQM release. Reference periods are labelled exactly and never blended. Full source list in the companion FACTS.md.
FACTS.md is the source-of-truth file; every figure in this report traces to it. The hero is a stock-versus-flow panel built from the publishers' verified figures. Phase 0 returned GREEN — the editorial spine, the methodology contrast, is confirmed in the ABS's own published words; one contaminated source (a Cotality URL resolving to the United States rent index) was caught and quarantined.
Domain annual rent figures are not cited (not verifiable to a primary source at the time of writing). SQM Research figures are cited as clearly-attributed secondary. City-level Cotality rent figures are not separately cited. The brief makes no forecast of Australian rents and does not adjudicate which measure is most useful — each samples a different renter.
Predict-not-recommend. Defamation-disciplined: the brief critiques what each measure samples — never the integrity or competence of any publisher or person; each measure is stated to be correct for the renter-population it samples. The Australian Bureau of Statistics, Cotality, SQM Research, and Domain are cited as the authoritative publishers of their respective series. The brief adds only the cross-measure comparison no single publisher prints.