Australian property investors face three different pressures: higher borrowing costs, falling lender valuations and changed future tax rules. Together, they can make refinancing harder even when the mortgage is being paid and the property still has positive equity. That's the risk behind the latest forecast downgrade — not proof that every owner is heading for a forced sale.
NAB's October 2026 Housing Monitor now forecasts an 8% fall across the eight capital cities during 2026, revised from 6%, and an approximately 11% peak-to-trough decline, with a floor in the second quarter of 2027. Those are bank forecasts, not falls that have already happened and not a prediction for your individual home.
Our September housing-market report covered how widely the downturn had spread. This is the next question: what happens when your property loses value, your repayments rise, and the seemingly obvious exits — refinance, draw equity or sell — each come with a different catch?
The forecast got worse. Your equity can move faster than the headline
NAB reports that combined-capital dwelling prices fell 1.2% in September and were 6.4% below their March 2026 peak. It puts Sydney 8.6% below its recent peak, Melbourne 7.2%, Perth 6.0% and Brisbane 5.4%. These are market-index measurements, not bank valuations of every property.
Keep the geography straight: the combined-capital 6.4% decline is not the same series as the national 5.2% decline discussed in our earlier article. And NAB's expected 8% calendar-year fall is not interchangeable with its 11% peak-to-trough forecast. Different starting dates and market coverage produce different numbers.
The unsettling part is leverage. A percentage change in a property's value can create a much larger percentage change in the owner's equity because the loan balance does not automatically fall with the market.
Consider an illustrative $1 million property with a $750,000 loan, keeping the debt unchanged. The middle row applies NAB's recorded combined-capital decline purely as a stress-test assumption; the last applies its forecast as a hypothetical scenario. Neither is a valuation of this property.
| Illustrative value change | Property value | Owner's equity before selling costs | Loan-to-value ratio | Headroom at an assumed 80% lending limit |
|---|---|---|---|---|
| No fall | $1,000,000 | $250,000 | 75.0% | $50,000 |
| 6.4% fall | $936,000 | $186,000 | 80.1% | $0 |
| 11% fall | $890,000 | $140,000 | 84.3% | $0 |
An 11% value fall cuts the starting equity by 44% in this example: $110,000 disappears from $250,000. Yet the owner still has $140,000 of positive equity before costs. That is not negative equity — it is a thinner safety margin.
The assumed 80% limit is a modelling choice, not a universal lender rule. Headroom here means the positive amount remaining after subtracting the existing debt from 80% of the value. At $936,000, that calculation is actually $1,200 below zero; at $890,000, it is $38,000 below zero. Higher-LVR products may exist, but eligibility, insurance, pricing and fees vary. Serviceability can restrict borrowing even where equity headroom remains.
You can be locked out of refinancing without missing a payment
The RBA raised the cash rate to 4.60% on 29 September. Its statement identified stronger-than-expected inflation, much higher global energy prices and domestic cost pressures, while acknowledging that housing prices had fallen in most capitals and new housing loans had declined noticeably.
That produces two separate hurdles for someone seeking a cheaper loan:
- The valuation hurdle: a lower lender valuation raises the loan-to-value ratio on an unchanged balance. A loan that once fit comfortably into one pricing or eligibility band may no longer fit.
- The repayment hurdle: a new lender checks income, expenses and other debts against its assessment criteria. Being able to pay the current mortgage does not automatically mean passing a new application.
APRA's guidance on housing lending standards explicitly recognises both problems: borrowers may fail serviceability requirements because of higher rates and living costs, or have less equity following housing-price declines. The guidance also describes limited, prudently managed exceptions assessed case by case. It is a regulatory explanation of the mechanism, not a new October forecast or a promise that your bank will waive its rules.
So “mortgage prison” does not have to mean the debt exceeds the value of the home. It can mean the current loan is manageable but switching to the loan you want is no longer straightforward. Our borrowing-power explainer explains why lending assessments and actual repayments are different tests.
The Budget changes the tax calculation — but not everyone's in the same boat
The property-tax changes are not merely a campaign threat. The ATO's reform summary, updated 29 June 2026, says “These measures are now law”, with changes applying from 1 July 2027.
The official Budget tax explainer sets out the distinctions investors need to keep separate:
- Properties held before the announcement at 7:30pm AEST on 12 May 2026 are exempt from the negative-gearing changes. Do not assume that every existing landlord loses the ability to offset rental losses against wages next July.
- For established residential investment properties purchased from that announcement time, the new rules from 1 July 2027 restrict losses to offsets against residential property income, including capital gains; excess losses can be carried forward. The reforms preserve negative gearing for new builds, subject to the applicable rules.
- For individuals, trusts and partnerships, the 50% CGT discount is replaced by cost-base indexation and a 30% minimum tax rate on capital gains, with the reforms applying to gains accruing after 1 July 2027. That is not a 30% tax on the property's sale price, nor a retrospective charge on all earlier gains.
These are high-level summaries. Ownership structure, acquisition timing, exemptions and transition arrangements matter; ask a registered tax adviser to apply the law to your circumstances. Our Federal Budget property-investor guide provides additional context, but official guidance should govern an individual decision.
The practical connection to rates is after-tax cash flow: higher interest costs increase the cash needed to hold a leveraged property, while the treatment of rental losses depends on which rules apply to it. The connection to selling is a separate CGT calculation.
Neither connection proves the Budget caused a particular percentage of the housing downturn. The RBA identifies inflation and energy pressures; NAB records weaker prices and lending. The available figures do not isolate a precise tax-policy contribution. Nor is “sell before July” a universal solution: transaction costs, the transition rules, your holding plans and individual tax position all matter.
Is Australia uniquely in trouble compared with the developed world?
Australia's headline policy rate is higher than several major peers in the latest verified September decisions: 4.60% here, compared with the US Federal Reserve's 3.75–4.00% target range, the euro area's 2.50% ECB deposit rate and Canada's 2.25% overnight target.
But “Australia hikes while everyone else cuts” is not an accurate description of those September meetings. The Fed raised its range by a quarter point, the ECB raised its three key rates by a quarter point, and Canada held. Australia has the higher level in this selected comparison, but it is not alone in facing renewed inflation pressure. Our international rate comparison explains why a selected group also cannot establish the highest rate in every advanced economy.
There is another important limit: policy rates are not mortgage rates, and they are not house-price rankings. Fixed-rate terms, refinancing arrangements, household debt and taxes differ between countries. A US borrower on a long-term fixed loan and an Australian borrower facing variable-rate repricing do not experience the same policy-rate change in the same way.
For actual international house-price comparisons, the OECD housing-price indicators distinguish nominal prices, real prices and price-to-income measures. A defensible comparison needs the same quarter and definition across countries. We could not verify a current, like-for-like multi-country price table for this article, so we cannot claim Australia's housing fall is the developed world's worst. Australia's refinancing squeeze is a real issue without that unsupported superlative.
Five checks before deciding to refinance, hold or sell
- Ask what value the lender will actually use. An online estimate, your purchase price and a lender's valuation are not interchangeable. Model a lower valuation as well as your central estimate.
- Separate equity from usable borrowing capacity. Record the loan balance, LVR, fees and any cash contribution needed. Then ask a broker or lender to test serviceability rather than assuming that positive equity guarantees approval.
- Get the existing lender's repricing offer too. Compare the total cost of staying against switching: rate, application and discharge fees, potential insurance and any fixed-rate break costs. An advertised rate is not an approval.
- Map each property's tax position separately. Record acquisition timing, ownership structure and the relevant transition rules. Do not apply one portfolio-wide assumption about negative gearing or CGT to every asset.
- Stress-test the cash needed to hold. Include actual repayment notices, rates, insurance, maintenance and vacancy. Our negative gearing calculator is useful for an illustrative cash-flow check, but do not assume it models every new Budget transition rule; confirm tax treatment independently.
Bottom line: NAB's revised forecast is a warning, not a guaranteed crash. The more useful warning for a leveraged owner is that refinancing options can shrink before equity reaches zero. Rates, valuations and tax rules interact, but each needs its own calculation. Check your numbers before turning a national headline into a decision about one property.
Sources checked 7 October 2026 UTC; article dated 8 October in Brisbane. NAB forecasts are scenarios, not recorded outcomes. The equity table is illustrative and excludes selling costs, tax, loan repayments and lender-specific conditions. General information only, not financial, credit or tax advice. Header image is an AI-generated Australian streetscape illustration, not a photograph of a property discussed in this article.
