Investment Strategy

Portfolio Rebalancing After Six Months of Falling Prices: Buy, Hold or Sell in 2026

Oct 14, 2026

Australian dwelling values fell for a sixth consecutive month in September, yet Perth recorded annual growth of 10.1 per cent while Sydney posted a decline of 7.0 per cent over the same twelve months. That divergence is the defining characteristic of the current cycle, and it changes what portfolio rebalancing actually means. The operative question is no longer whether to adjust holdings. It is which assets are still performing against the mandate they were acquired under, and which have quietly stopped doing so.

What the September data shows

Cotality, the research house formerly known as CoreLogic, reported that its national Home Value Index fell 1.1 per cent in September, leaving dwelling values 5.2 per cent below the March 2026 peak and flat over the year at a median of $899,236. Every capital city except Darwin declined during the month.

Capital	Monthly change	Quarterly change	Annual change	Median value
Sydney	down 1.4 per cent	down 4.9 per cent	down 7.0 per cent	$1,198,596
Melbourne	down 0.7 per cent	down 3.4 per cent	down 6.2 per cent	$780,550
Brisbane	down 1.5 per cent	down 4.7 per cent	up 5.9 per cent	$1,048,880
Perth	down 1.2 per cent	down 4.7 per cent	up 10.1 per cent	$975,022
Adelaide	down 1.3 per cent	down 2.7 per cent	up 6.5 per cent	$928,560
Canberra	down 1.1 per cent	down 3.2 per cent	down 1.6 per cent	$861,744
Hobart	down 0.5 per cent	down 1.2 per cent	up 7.0 per cent	$741,496
Darwin	up 0.4 per cent	up 0.5 per cent	up 11.9 per cent	$633,431

Source: Cotality Home Value Index, September 2026, released 1 October 2026.

Breadth has widened. Cotality found that 97 per cent of capital city suburbs recorded a decline over the three months to the end of September, up from 93 per cent through winter, and its Mapping the Market analysis showed 79.5 per cent of analysed house and unit markets moving backwards over the September quarter, with 38.3 per cent now below their values from twelve months earlier. Transaction activity confirms the same picture: sales volumes sat 19.1 per cent below the previous year while total inventory rose 23.1 per cent, lifting median days on market to 39 against 23 a year ago.

Rebalancing is allocation, not timing

A broad downturn pushes investors toward two symmetrical errors: selling into thin liquidity because prices are falling, or refusing to act at all and treating every holding as though it were the same asset. Both responses ignore dispersion in the data. A portfolio that holds a Sydney house down 7.0 per cent annually alongside a Perth property up 10.1 per cent is not one portfolio facing one market. It is several positions with different economics, and rebalancing means re-testing each against its original purpose rather than reacting to a headline.

Three tests before changing anything

Test one: the cash flow test

SQM Research recorded the national rental vacancy rate at 1.4 per cent in September, up from 1.2 per cent twelve months earlier, with 42,290 vacant dwellings nationally. Sydney moved to 1.8 per cent and Melbourne to 1.9 per cent, while Brisbane held at 0.9 per cent and Perth, Adelaide, Darwin and Hobart all remained below 1 per cent.

Rent direction now differs by property type. Over the 30 days to 12 October, house asking rents rose 1.6 per cent nationally while unit asking rents fell 1.6 per cent, with declines recorded in seven of eight capitals. Cotality measured the national gross rental yield at 3.85 per cent at the end of September, its highest reading since August 2019, ranging from 3.4 per cent in Sydney to 6.5 per cent in Darwin.

A rising headline yield is not automatically a stronger asset. Where yield improvement comes from a falling denominator rather than rent growth, and where vacancy is simultaneously rising, the improvement is arithmetic rather than operational. Each holding should be tested against its net position after interest, insurance, maintenance, strata levies and vacancy allowance, not against gross yield.

Test two: the holding cost test

The cash rate sits at 4.60 per cent following the Reserve Bank's September meeting, with the next decision scheduled for 2 to 3 November and the September CPI release on 28 October as the principal input ahead of it. RBA modelling has placed scheduled mortgage payments close to their 2024 peak as a share of household disposable income.

For rebalancing purposes the consequence is timing arithmetic rather than rate forecasting. An asset listed into a market carrying a median 39 day sales period continues to absorb full holding costs until settlement completes. A disposal that takes three months to conclude can consume several thousand dollars in carrying costs before proceeds arrive, which changes whether selling at a depressed price is genuinely cheaper than holding through the quarter.

Test three: the tax status test

Assets owned or contracted before 12 May 2026 retain their existing negative gearing and capital gains treatment. From 1 July 2027, rental losses on established residential property acquired after that date are quarantined and carried forward for use only against future residential income or the eventual capital gain on sale, while new builds remain outside those restrictions.

This functions as a rebalancing constraint rather than a tax analysis. Disposing of a grandfathered asset permanently surrenders its status, and replacing it resets the position under the incoming regime. Taxation, legal and structural finance rules are highly complex during this transition, and any decision to sell, restructure or replace an asset should be verified with a Certified Practising Accountant or licensed financial planner before acting.

When holding is the correct move

Holding remains defensible where three conditions align. The position retains grandfathered tax treatment. It sits in a market still positive over twelve months with vacancy below 1 per cent, which on the published data currently describes Perth, Brisbane and Adelaide. And it produces net cash flow after all holding costs without further capital injection. An asset acquired for long horizon growth that is moving within normal cycle variance is not automatically a problem requiring intervention.

When selling makes structural sense

Disposal becomes rational where an asset fails more than one test at the same time. Unit stock in capitals where vacancy is rising and asking rents are falling, which currently applies to parts of Sydney and Melbourne, faces a softening income line alongside a longer sales period. Houses have underperformed units through this correction: nationally house values fell 1.2 per cent against 0.8 per cent for units in September, and across the capitals houses remain further below their peaks than units. An asset that requires repeated capital injections merely to hold neutral cash flow is consuming capacity that a differently positioned asset would release.

When buying fits a rebalanced portfolio

Entry discipline matters more than urgency. Perth retains the lowest median house value of any capital at $584,941 and Darwin the most affordable units at $377,432 on Cotality's Mapping the Market data, while regional markets proved comparatively resilient with the combined regional index down 0.7 per cent in September against 1.2 per cent across the capitals. New build eligibility under the post July 2027 rules is a structural consideration that favours some acquisition types over others.

A rebalanced portfolio typically funds an acquisition from three sources: released equity, disposal proceeds, or reduced holding costs on existing positions. Sequencing those sources against your investment objective, property budget and finance and purchasing timeline determines whether the next purchase expands borrowing capacity or contracts it.

A practical sequence

Classify every asset by its original mandate: income generation, growth exposure, diversification or tax efficiency.
Run the cash flow test using current vacancy and rent direction for that specific market and property type.
Confirm grandfathered status before any disposal decision is made.
Stage disposals so you are not selling and buying inside the same quarter in the same market segment.
Hold where all three tests pass, and record why, so the next review measures change rather than sentiment.

If you want an independent assessment of which holdings in your portfolio still match their original mandate, book a free Strategic Call with our team to map your investment objective, property budget and finance and purchasing timeline against current market data.