Federal borrowing is running above $50 billion this financial year, wage growth is tracking below inflation, and mortgage holders are carrying record debt-to-income ratios. The claim that fiscal mismanagement is pushing rates higher and breaking household budgets sounds simple. The actual transmission mechanism is not.
Here’s what the data shows about how deficits, inflation expectations and central bank policy interact, and where the real pressure on mortgage holders is coming from.
The fiscal-to-mortgage channel: theory versus mechanics
In theory, larger government deficits mean more bond issuance, which can push up yields and borrowing costs across the economy, including mortgage rates. In practice, the RBA sets the cash rate based on inflation and employment, not the deficit level. Commercial banks price mortgages off the cash rate plus their own funding costs and margin decisions.
Over the past 18 months, the cash rate moved from 0.10 per cent to 4.35 per cent. That increase tracked inflation running above the RBA’s 2-3 per cent band, not a change in fiscal settings. Government bond yields did rise, but global rate moves (the US Federal Reserve lifted rates faster and further) explain most of that shift. Domestic fiscal policy added some upward pressure on demand, which kept inflation elevated longer, but the RBA’s response was the direct cause of higher mortgage costs.
The trade-off: tighter fiscal policy earlier might have meant smaller rate rises, but the Commonwealth was running stimulus through 2021-2022 to support recovery from lockdowns. Whether that was the right call depends on your view of inflation risk versus employment protection at the time.
What’s actually driving mortgage stress right now
Mortgage stress is real and measurable. Around 1.5 million households are now spending more than 30 per cent of income on housing costs, according to recent estimates. The drivers are layered:
- Interest rates went from historic lows to a 12-year high in 16 months. A $600,000 mortgage at 2.5 per cent costs roughly $2,370 a month in principal and interest; at 6.5 per cent it’s $3,790. That’s an extra $17,000 a year.
- Wage growth has been running at 3.5-4.0 per cent while CPI peaked above 7 per cent and is still around 3.5 per cent. Real incomes fell for most of 2022 and 2023.
- House prices rose 28 per cent nationally between mid-2020 and early 2022, so buyers who entered the market in that window are carrying larger loans at higher rates.
- Savings buffers built during lockdowns have been drawn down. Mortgage holders who could absorb the first few rate rises are now hitting cashflow limits.
Fiscal policy sits in the background of that picture. Government spending added to demand when inflation was already rising, which extended the rate-hiking cycle. But the household pain comes from the combination of high debt levels, rapid rate increases and weak real wage growth, not directly from the deficit number.
Key numbers
- Cash rate: 4.35 per cent, up from 0.10 per cent in May 2022
- Median mortgage holder repayment increase: roughly $1,400 per month since mid-2022 (on a $600,000 loan)
- Households in mortgage stress: approximately 1.5 million (spending over 30 per cent of income on housing)
- Federal deficit projection: $52 billion for 2024-25
- Real wage growth: negative through most of 2022-2023, now barely positive
The counterfactual: would tighter fiscal settings have kept rates lower?
If the federal government had run smaller deficits in 2021-2023, demand would have been weaker, inflation might have peaked lower, and the RBA might have stopped raising rates sooner or not lifted them as far. That’s the argument.
The complication: inflation was largely driven by global energy and goods prices, supply-chain disruptions and a post-lockdown surge in services demand. Domestic fiscal tightening would have reduced some of that demand pressure, but not the imported component. The US, UK and Europe all saw similar inflation spikes despite very different fiscal settings.
The RBA’s own commentary points to tight labour markets and strong consumer spending as reasons for holding rates higher for longer. Fiscal restraint would have cooled both, so there’s a plausible link. The question is scale: would a $20-30 billion smaller deficit have shaved 0.25-0.50 percentage points off the peak cash rate, or less? The data doesn’t give a clean answer, because fiscal and monetary policy don’t operate in isolation.
Who gets hit hardest
Mortgage stress is not evenly distributed. Borrowers who bought in 2020-2022 with high loan-to-value ratios are most exposed. First home buyers using government deposit schemes to enter the market with smaller buffers are feeling the strain now. Households in outer suburbs where prices rose sharply during the pandemic, then stalled or fell, are carrying debt against falling equity.
Renters are hit differently: vacancy rates below 1 per cent in most capitals mean rents are rising faster than wages, with no rate relief in sight. The rental supply shortage is structural, not a short-term rate cycle issue.
Investors with interest-only loans rolling onto principal-and-interest are refinancing or selling. That adds supply to the sales market but tightens rental stock further, which pushes rents higher and increases the number of renters in housing stress.
What could change the pressure
Three scenarios over the next 12 months:
- Base case: inflation stays around 3.0-3.5 per cent, RBA holds rates steady through mid-2025, then cuts 0.25-0.50 percentage points by year-end. Mortgage stress persists but stabilises as buffers adjust and wage growth catches up slowly.
- Upside: inflation falls faster than expected, RBA cuts earlier and deeper, relief arrives by late 2025. Requires weaker demand or a sharper slowdown than current data suggests.
- Downside: inflation proves sticky, RBA holds or lifts again, unemployment rises, forced sales increase. Fiscal tightening in this scenario would deepen the slowdown and hurt employment without delivering faster rate cuts.
The fiscal policy response matters most in the downside case. If unemployment rises sharply, the case for counter-cyclical spending (even if it adds to the deficit short-term) gets stronger. The trade-off between inflation control and employment protection is live again.
Practical take for mortgage holders
If you’re in stress now, the policy debate doesn’t change your next decision. Start here:
- Check your current rate against the market. Fixed rates are sitting around 5.8-6.2 per cent; if you’re rolling off a 2.0-2.5 per cent fix onto a 6.5 per cent variable, refinancing or negotiating could save $100-200 a month.
- Stress-test your cashflow at 7.0 per cent. If that breaks your budget, consider extending the loan term to reduce monthly repayments (costs more long-term, buys breathing room short-term).
- If you’re borderline, contact your lender now before you miss a payment. Hardship arrangements are easier to negotiate early.
- If you’re thinking of selling, compare the cost of holding (negative cashflow, opportunity cost of equity tied up) against transaction costs and where you’ll live next. Mortgage stress hotspots often see distressed listings cluster, which can push local prices down further.
For those still deciding whether to buy, the question of whether prices are falling matters less than your serviceability buffer at current rates. Don’t assume rates will fall soon enough to fix a tight budget.
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General info, not financial advice.
