According to realestate.com.au, Australian borrowers are being assessed at a stress-tested rate of 9.73% just to swap into home loans that would actually lower their monthly repayments. Canstar data insights director Sally Tindall says a new type of mortgage prisoner has emerged, one whose own falling equity — not just rising rates — is now the barrier to a cheaper deal.
The Mechanics of Mortgage Prison
Tindall explains the bind plainly: a borrower who took out a loan five years ago at an average rate of 2.59% was assessed back then at a seemingly prudent 5.59%. But the "4.75 per cent of rate hikes we've seen" since October 2021 — when APRA lifted its mandatory buffer from 2.5 to 3 percentage points — has swallowed that cushion whole, according to realestate.com.au. With new owner-occupier variable rates now averaging 6.73%, the standard 3 percentage point buffer pushes the stress test to 9.73%. Even where banks apply a reduced 1 percentage point buffer, as some lenders began doing from 2023, the test still sits at 7.73%.
Related reading: REAStats Australian property market intelligence.
The cruelty of the mechanism is that it ignores the actual outcome of the refinance. A borrower whose new repayment would be lower than their current one can still fail the test, because the bank is required to check they could service a rate roughly three points higher than whatever they're applying for — not whatever they're currently paying. Westpac, NAB and ANZ moved in 2023 to offer reduced buffers of 1 or 2 percentage points for borrowers who met other strength metrics, but Tindall notes this concession "can still prove difficult" once base rates sit at levels not seen since 2008.
There is a second, newer complication layered on top. Tindall says falling property values are now locking out a fresh cohort of borrowers who bought more recently. Refinancers generally need at least 20% equity to avoid lenders mortgage insurance on the new loan, and LMI can wipe out any financial benefit of switching. Because equity is measured against current valuations, and prices have been sliding in most capital cities, some borrowers who once sat comfortably above that 20% line now find themselves below it.
Why Falling Prices Are Making This Worse, Not Better
Normally, falling interest rates or falling repayment burdens would be good news for stretched borrowers. Here, the opposite dynamic applies: falling property values are actively working against people trying to escape expensive loans. Tindall attributes this partly to rate-driven softness and partly to "the federal government's property tax changes," without specifying further detail. Either way, the effect is the same — a borrower's loan-to-value ratio moves the wrong way even if they haven't missed a single repayment.
This creates a double trap for anyone who bought with a thin deposit in the last few years. Not only did they start closer to the 20% equity threshold, they are now watching valuations erode that buffer further, according to the same analysis. Someone who "previously owned 20 per cent of their property" may now own less in proportional terms purely because the denominator — the home's assessed value — has shrunk. Borrowers in this position are stuck servicing whatever rate their existing bank offers, with limited ability to walk and limited leverage to negotiate, because the bank knows they can't easily leave.
A borrower refinancing today can be rejected for a loan that would cut their monthly repayment, because the bank's 3 percentage point buffer tests serviceability against a hypothetical rate rather than the lower rate actually on offer.
What Borrowers Can Actually Do
Tindall's practical suggestions are limited but concrete. Borrowers can try negotiating directly with their existing bank, though she concedes this is "a tough ask without much leverage if you can't actually leave." A second option is actively rebuilding borrowing capacity — closing unused credit cards, reducing credit limits, cutting discretionary spending and paying down other debts before reapplying. A third is accepting lenders mortgage insurance on the new loan if the maths still works out ahead despite the added cost.
Anyone assessing whether a refinance still clears the hurdle should understand exactly how LVR thresholds and LMI interact — see LVR and LMI Explained. Borrowers weighing structure changes as a stopgap might also compare Interest Only vs Principal and Interest repayment options, or look at Offset Account vs Redraw Facility differences to squeeze more value from the loan they're stuck with. None of these options change the underlying constraint: the stress test is applied to the new loan's rate plus buffer, not to the saving the borrower would actually realise.
This article was produced with AI assistance and reviewed for accuracy. Content is for informational purposes only and does not constitute financial or property investment advice.
