National advertised rents hit a record $675 in September. Vacancy climbed to 1.5%, highest since February 2022

The first clear deceleration since 2022#

The September quarter marks the first unambiguous slowdown in Australian rent growth since the post-pandemic rental squeeze opened in early 2022. PropTrack's quarterly series has national advertised rents up 1.5% over the September quarter, compared with 2.3% in the June quarter. Annual growth sits at 5.5%, the softest annual print on the series since October 2025.

Cotality's independent Quarterly Rental Review ran the same month and ran the same way. National rents grew 0.5% over the September quarter, down sharply from 1.6% in the June quarter and 2.1% in the March quarter. Annual growth eased from 5.9% to 5.5%. Two different methodologies, two different medians, one direction.

The vacancy reading tells the matching story. PropTrack has national vacancy at 1.5%, up from 1.3% in the June quarter and the highest reading since February 2022. SQM Research puts September vacancy at 1.4% on 42,290 empty dwellings, up from 1.3% in August. Cotality's series goes higher again at 2.1%, the highest since January 2025.

For a landlord, the vacancy level is still extraordinarily tight by any historical reference. The 3-4% range that most Australian economists treat as balanced sits more than double the current reading. The direction, not the level, is what has changed.

Capital spreads are now the widest of 2026#

The national headline conceals a growing gulf between capital markets. The September data has one clear hot capital, one clear cold capital, and a tightening band across the rest.

• Darwin posted the fastest annual rent growth of any capital at 13.8%, taking the median to $740 a week.
• Perth rents rose 8.7% on the year, with vacancy at 0.9%.
• Hobart sits with Perth on 0.9% vacancy.
• Adelaide is at 1.0% vacancy.
• Sydney, Melbourne and Canberra are each above the national average, with SQM pinning them at 1.8%, 1.9% and 1.9% respectively.
• Brisbane remains below 1% on SQM's measure.

The split between Darwin at 13.8% and regional NSW near zero is the widest annual spread in the series this year. For a landlord, the implication is that the national CPI print is now a poor proxy for the rent-review decision. A review drafted in Darwin faces a different market than one drafted in Newcastle. A portfolio that straddles both needs to run the postcode-level comparables separately.

Capital city rents combined reached $700 a week in September, up 1.4% quarterly and 7.7% annually. Regional rents held unchanged at $600 a week, with annual growth of 3.4%. Megan Lieu, who authored the PropTrack release, noted that annual growth in regional rents is softening while the reverse is happening in capital cities.

The yield picture: 3.85% and still falling short of the loan rate#

Cotality's September 2026 Quarterly Rental Review has the national gross rental yield at 3.85%, up from 3.61% a year earlier and the highest reading since August 2019. Combined capital city yields rose from 3.40% to 3.70% over the year. Unit yields across the capitals average about 4.7%, compared with 3.4% on houses.

The yield expansion is not a demand story. It is an arithmetic one. Rents are still rising, slowly. Values are falling, faster. The ratio moves up as the denominator falls. Cotality's September Home Value Index had national dwelling values down 1.1% in September, with values sitting 5.2% below the March peak, per the firm's October release.

For a leveraged investor, the gap between gross yield and the funding cost is what matters.

• The RBA cash rate target is now 4.60% after the 29 September 2026 move.
• Standard variable investor rates at the Big 4 price above 7% on new loans.
• Discounted investor variable rates settle in the 6.60% to 6.90% band after lender pass-through.
• The CBA pass-through hit 9 October 2026. Macquarie moves on 15 October.

On a $600,000 interest-only investor loan at 6.80%, the annual interest cost is approximately $40,800. A property renting at $675 a week collects $35,100 a year in gross rent. The yield math stays negative on interest alone before rates, insurance, repairs, management or vacancy are counted.

The gap between the September gross yield of 3.85% and a 6.80% investor loan rate is 2.95 percentage points. On a 70% LVR purchase of a $700,000 property, that spread costs roughly $14,500 a year before tax. Negative gearing recovers part of that against other income, up to the marginal rate. For a top-bracket investor at 45%, the after-tax drag is about $7,975. For a 37% investor it is about $9,135.

The three forces behind the slowdown#

Rent growth has decelerated at a vacancy rate that is still inside the historically tight band. Three structural forces explain it.

First, affordability has run into the wage. Wages Price Index growth sat at 3.2% in the June quarter 2026 against five consecutive quarters of rent growth above 5.5%. Rent-to-income ratios across the capitals have pushed through the thresholds that bank serviceability models flag as stress. The pool of renters who can bid harder at listing has thinned, and listings now sit on market longer before an application is accepted. The June quarter spread of 2.7 percentage points between wage growth and rent growth is already feeding back into landlord-advertised rents through longer time-to-let on existing stock.

Second, the apartment pipeline has delivered. Dwelling approvals have run below the Housing Accord cadence for most of 2026, but the completions that were approved in 2023 and 2024 are landing now, concentrated in Sydney and Melbourne apartment stock. SQM's higher vacancy prints for Sydney and Melbourne reflect that drop. The pipeline-into-vacancy effect is strongest where approvals were strongest two years ago, which is why Perth and Darwin, with thinner apartment pipelines, remain tight.

Third, migration has stepped down. Net overseas migration has eased from the FY24 peak. The reduction trims marginal rental demand without changing the structural shortage. The result is a modest loosening at the edges of the market rather than a reset of the base case.

The three drivers are enough to halve quarterly rent growth from 2.3% to 1.5% while vacancy remains below two-thirds of the balanced level.

What landlords should do with this data#

The September release is a signal, not a crisis. For a self-managing landlord with an existing tenant, four decisions follow directly from the numbers.

1. Draft rent reviews against local comparables, not the national CPI print#

The national median moved $10 a week in the September quarter. The Darwin market moved roughly $90 a week on the year. Picking a national or state average as the anchor for a rent review will leave money on the table in Darwin and Perth and will push a Melbourne or Sydney tenant into contestation. Pull the postcode-level comparables for the same bedroom count on the day the review is drafted. In most state tenancy frameworks, a review that cites specific comparable properties will survive a tribunal challenge where a review that cites CPI alone will not.

2. Confirm the state rent-review rule before issuing a notice#

Each state has its own rent-review architecture. NSW caps rent increases to once a year. Victoria has mirror provisions through its rental reforms. Queensland's limit now applies to the property, not the tenancy, so turnover does not reset the clock. The ACT has a prescribed CPI-plus formula. Western Australia and the Northern Territory have the lightest regimes. The right first step is the state's own fair trading or consumer affairs page, not generic market commentary.

3. Pull every deductible forward into the current income year#

Cotality's gross yield at 3.85% is a before-cost number. The after-cost figure for a leveraged landlord is a long way below it. The most reliable way to protect the after-tax position is to make sure every deductible is in the correct income year.

• Interest on the investment loan is deductible to the extent the loan funded the acquisition or improvement.
• Rates, land tax and body corporate fees are deductible when incurred.
• Insurance premiums are fully deductible in the year paid.
• Repairs are deductible immediately. Capital improvements are depreciated.
• Depreciation under Division 40 for plant and equipment and Division 43 for the building continues to apply, subject to the second-hand asset rules introduced in 2017.

For a landlord with a quantity surveyor's report prepared more than two years ago, Q4 is the right time to refresh it. Rebuild costs have moved materially since the last cycle.

4. Diarise the leasing timing against the Q1 2027 window#

The historical pattern is that the January to March window carries the lowest vacancy and the strongest asking rent of the year, as university lease cycles and migration refresh the demand base. A fixed-term lease due to expire in Q4 2026 is better rolled to a Q1 2027 anchor than re-signed on the current soft number. For a lease expiring in Q1 2027 already, the next review is where the national data lands against the local comparables.

The 2027 overlay: negative gearing and the new-build boundary#

The September rental data arrives six months after the May 2026 federal budget cut-off for the negative gearing changes that commence 1 July 2027. Established dwellings exchanged on contracts dated after 12 May 2026 lose negative gearing treatment from that date. New builds keep both the deduction and the 50% CGT discount.

For a landlord weighing a Q4 2026 acquisition, the overlay matters. A purchase that settles on a pre-12 May contract maintains the current rules on the current rental yield math. A new acquisition on a post-12 May contract carries the 1 July 2027 reset. The yield gap, now 2.95 percentage points at a 6.80% loan rate, will widen rather than close for the stock that falls on the wrong side of that boundary.

The lesson from the September data is that the rent-growth cushion that has absorbed four RBA hikes, 14.78% insurance renewal increases and a 10.4% rise in household mortgage interest since the start of 2026 has started to thin. It has not disappeared. It is thinner. For a portfolio that has run on the assumption that strong rent growth was carrying the cash flow, the September print is the first clear data point that the carry is weakening.

Sources and primary data#

• Mortgage Professional Australia, PropTrack September 2026 Rental Report coverage
• Broker News, record $675 rent and vacancy edging higher
• Elite Agent, capital city rental growth shifts as regions slow
• Your Investment Property Magazine, Cotality yields hit a seven-year high
• SQM Research national vacancy rates
• RBA cash rate target
• ATO rental expenses, residential rental properties

---

Running an investment property into Q4 2026 means watching four lines at once: the rent, the loan rate, the renewal premium and the deductible stack. Propkt's mortgage calculator runs the loan-rate math on investor serviceability, and the expense tracker keeps every deductible categorised against the ATO's rental schedule so nothing moves out of the year it belongs in. Rent management keeps the lease, review date and asking-rent anchor in one place, which is what a decelerating rent market now rewards.