Tuesday’s 25-basis-point rate increase pushed the cash rate to 4.6%, its highest level since 2011. For a $731,000 loan at a typical variable rate of 6.2%, that adds roughly $119 to monthly repayments now sitting around $4,477. The number itself is manageable for many. The question is how many borrowers have already exhausted every adjustment available before this hike arrived.
The gap between inconvenience and genuine constraint is narrower than most policy commentary suggests. Streaming services, takeaway meals, annual holidays are the first budget lines to go. After that comes the harder trade-off: a stay-at-home parent returning to work, bulk buying from wholesalers, skipping car servicing, delaying dental checkups. The final stage is when those options have all been exercised and repayments still exceed available cashflow.
The mechanics of running out of room
A household with a $345,900 loan paying $625 per week in repayments, including a $100 voluntary buffer, faces a straightforward calculation. Stripping that buffer drops the minimum to $525, buying temporary relief. Cutting discretionary spending might recover another $150 to $200 per week. Adding a second income adds more, but childcare costs and the loss of family support hours mean the net gain is smaller than the gross.
Once those levers are pulled, further rate increases hit with no remaining slack. A borrower already paying 35% or 40% of household income toward the mortgage has no room to absorb another $30 per week without missing other essential bills. The pattern shows up in arrears data with a lag: borrowers exhaust savings and credit card limits before a mortgage payment is missed, so the headline stress measurement arrives months after the actual constraint began.
The catch
The Reserve Bank’s own household survey shows roughly 5% of variable-rate mortgage holders report being unable to meet repayments from current income without drawing on savings or selling assets. That share has been rising slowly since mid-2023, but the trailing nature of arrears data means the true number of households now operating without remaining adjustment capacity is higher than reported stress metrics suggest.
What the distribution looks like
Not every borrower is in the same position. A household that locked in a fixed rate in 2020 and rolled onto a variable rate in 2023 has absorbed the full cumulative increase of 425 basis points over two years. Someone who bought in 2019 with a 20% deposit and minimal other debt may still have discretionary room. Someone who bought in 2022 with a 5% deposit, maximised their serviceability at application, and now faces a $200-per-week repayment increase from rate rises alone has no buffer left.
The cohort most likely to cross the threshold: loans originated between 2020 and 2022, high loan-to-value ratios at purchase, single-income or recently dual-income households where the second income is new and unstable, and borrowers in outer suburbs where transport and childcare costs are high and wage growth has lagged inner-city markets.
CoreLogic data shows Sydney’s outer west and Melbourne’s growth corridors have seen the sharpest increases in median repayment-to-income ratios over the past 18 months. These are the same areas where household savings buffers were thinnest to begin with.
The arrears question no one’s answering precisely
Arrears remain historically low, sitting below 1.5% for most lenders. That sounds reassuring until you account for two offsetting forces. First, forced sales and hardship arrangements move loans out of the arrears count before they show up as defaults, so the published figure understates the number of households under genuine stress. Second, the lag between when a household exhausts its capacity to adjust and when it misses a mortgage payment can stretch six to nine months, meaning today’s arrears data reflects conditions from early 2025, not now.
The governor’s comments after Tuesday’s decision acknowledged the trade-off: rate increases hurt mortgage holders and businesses, but inflation unchecked hurts everyone, especially those without assets. That framing is technically correct but doesn’t address the distribution question. If 5% to 8% of mortgage holders are now operating without remaining capacity, further rate increases don’t change their behaviour, they just accelerate the path to arrears or forced sale. The policy impact then falls entirely on the remaining 92% to 95%, who carry the demand-dampening load.
Who crosses the line next
Another 25-basis-point increase would add roughly $120 per month to the average mortgage. For borrowers already at the constraint threshold, that’s the difference between staying current and falling behind. The share of households in that position is hard to measure precisely, but combining RBA survey data, lender hardship arrangement volumes, and mortgage broker reports suggests somewhere between 8% and 12% of variable-rate borrowers are now within one or two rate moves of genuine distress.
That doesn’t mean mass defaults are imminent. Unemployment remains low, wage growth is running above 3%, and most borrowers still have equity buffers that allow refinancing or downsizing before a forced sale. But it does mean the sensitivity of arrears to further rate increases is rising. Each additional move will push a larger share of the borrower base over the line, and the economic cost of those moves, in terms of consumption foregone and household stability lost, is higher than it was 12 months ago.
What to watch over the next six months
Three indicators will show whether this threshold is widening or holding. First, 30-day arrears by origination year and geography. If outer-suburb loans from 2021 and 2022 start ticking up faster than the aggregate, that confirms the cohort analysis. Second, hardship arrangement volumes reported in lender results. A jump there precedes the arrears rise by two to three months. Third, auction clearance rates and median days on market in those same outer suburbs. Borrowers selling before missing payments show up in price weakness and volume, not arrears.
The base case from here: one more rate increase in the next six months, then a hold through mid-2026. That would push the cash rate to 4.85%, adding another $120 per month to the average mortgage, and likely move the share of genuinely constrained borrowers from 8-12% to 12-15%. Arrears would rise from current levels below 1.5% toward 2% to 2.5% by late 2026, still well below the stress thresholds seen in previous cycles, but materially higher than the past three years.
The downside scenario: inflation stays elevated, the RBA adds two more increases instead of one, and unemployment ticks up from current levels. That combination would push a significantly larger share of borrowers into distress and likely trigger a meaningful rise in forced sales and price correction in the most leveraged segments of the market.
Bottom line for anyone carrying mortgage debt now
If you’re still operating with discretionary room, the immediate risk is low. If you’ve already stripped every non-essential cost and added a second income or extra shifts to stay current, you’re at the threshold, and another rate rise puts you in the distress zone. The practical move: calculate your true minimum serviceability, pressure-test it against one more $120-per-month increase, and if the numbers don’t work, start the hardship conversation with your lender now rather than after you’ve missed a payment. Selling or refinancing before you’re forced to gives you more control over timing and price.
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General info, not financial advice.
