The Reserve Bank's decision to raise the cash rate to 4.10 per cent on 17 March dealt a blow to Australia's first-home buyers just as government support schemes were set to unlock thousands of new entrants to the property market. The move, decided by the narrowest margin (5-4) in months, marks the second rate rise this year and threatens to unwind the gains from policy reforms introduced only six months ago.
The numbers speak for themselves. Mortgage stress, measured by Roy Morgan as the share of borrowers spending more than 30 per cent of income on housing, sat at 23.9 per cent in January 2026—the lowest level in three years. But the RBA's February and March hikes have begun to reverse that improvement. Roy Morgan forecasts that if rates climb again by May, the share of mortgage holders in stress will jump to 28.9 per cent, affecting more than 1.4 million Australians.
First-home buyers face particular danger. The government expanded the 5 per cent Deposit Scheme on 1 October 2025, removing income caps, wait lists, and the need to pay lenders mortgage insurance. The expanded scheme was designed to pull forward as many as 20,000 additional buyers into the market and push annual first-home buyer numbers from 110,000 toward 150,000. Yet higher rates directly shrink the amount these buyers can borrow, regardless of how little deposit they hold.
Here's the mechanism at work. A first-home buyer with a 5 per cent deposit carries a high loan-to-value ratio; their equity buffer is thin. When interest rates rise, banks respond by tightening affordability calculations. The same buyer who could borrow $600,000 at 5.50 per cent can now borrow perhaps $560,000 at 6.00 per cent. That shrinkage happens immediately, even if the buyer qualifies under the government scheme. Property prices, meanwhile, continue to climb. Real Estate Institute forecasts suggest Sydney median values will reach $1.92 million by year end, Melbourne $1.17 million. The window for first-home buyers narrows.
The geographic impact is uneven. Roy Morgan's state breakdown shows Tasmania facing the worst mortgage stress, with 29.8 per cent of borrowers at risk in January, set to rise to 32.6 per cent if rates climb again. Victoria follows at 27.2 per cent, climbing to 29.9 per cent. These states—where affordability was already stressed—absorb the sharpest pain from rate hikes.
The banks aren't done hiking either. Commonwealth Bank and National Australia Bank both forecast a 0.25 per cent rise in May, with further moves possible if Middle East energy shocks persist and inflation doesn't cool. For borrowers on variable rates—which includes most recent first-home buyers—each hike bites directly into repayment capacity.
The paradox is stark. The government's October reforms were designed precisely to solve the first-home buyer problem: remove barriers, cut costs, expand access. But those reforms assumed a stable rate environment. The inflation surge of late 2025, turbocharged by fuel price shocks from Middle East tensions, has forced the RBA into tightening mode just as policy was designed to loosen entry conditions. It's a mismatch that the government's scheme, however well-designed, cannot bridge. Higher rates affect all borrowers equally.
For investors monitoring Australian household finances, the signal is clear. Mortgage stress is about to accelerate. The first-home buyer surge that policymakers expected to arrive in 2026 may yet arrive, but on far weaker terms—smaller loans, fewer buyers competing for properties, or many simply stepping back until rates stabilise. The government support is real and useful. The rate environment is now stronger.