Is the RBA's Fifth Rate Hike to 4.85% Justified?

The Reserve Bank lifted the cash rate target by 25 basis points to 4.85% on Melbourne Cup day, its fifth increase this year. The decision was not unanimous. Six members voted for the increase and three voted to leave the rate at 4.60%. The board's stated concern is inflation that is both high and broad.

Headline CPI rose 4.3% in the year to September 2026, up from 4.0% in August. Trimmed mean inflation, the RBA's preferred measure of underlying trend inflation, rose to 3.6% from a revised 3.5%. Trimmed mean is the number that matters most here because it strips out volatile items and shows what is happening across the broader economy.

The RBA also pointed to rising global cost pressures and signs that the Australian economy is running closer to its capacity limits. In plain terms, businesses have more room to pass on costs and workers have more bargaining power, which keeps price growth elevated even after the initial shock fades.

The RBA's own forecasts show inflation staying above 3% until late 2027. That single line is the reason the board moved now rather than waiting for a clearer picture.

The strongest argument for the hike is that inflation has become embedded rather than temporary. When trimmed mean inflation is still rising and sits well above target, the risk is that price and wage expectations adjust upward, making the problem harder to unwind later.

The labour market is the second pillar. The RBA cited signs of greater capacity constraints in the economy, which means firms are struggling to find workers and supply is stretched. In that environment, demand-driven price pressure is harder to dampen without a tighter policy stance.

The governor, Michele Bullock, framed the decision explicitly as a trade-off: "some pain now will prevent even worse pain down the track." That is the logic of acting early. A smaller increase today is argued to be cheaper than a larger one required after inflation becomes entrenched.

The supporting case is strongest for anyone who believes central banks lose credibility when they wait too long. The 1970s offer the cautionary example that economists keep returning to.

The strongest counterargument is timing. Five hikes this year have been delivered in quick succession, and monetary policy works with long lags. Much of the tightening from earlier moves has not yet reached household budgets, particularly for borrowers who fixed rates before the cycle began and are now facing resets.

Household debt sits at the centre of the concern. Australian households carry high mortgage balances relative to income, so each increase transmits quickly into repayments. Reddit's r/AusFinance threads on the decision are dominated by this worry, with dual-income households describing extra repayments eating into disposable income.

Those anecdotes are not data, but they reflect a real squeeze that the aggregate figures can hide. The third argument is that not all inflation responds to interest rates. Much of the recent price growth reflects global cost pressures and supply conditions, which rate hikes cannot fix directly.

Raising rates to suppress demand can overshoot, slowing the economy more than the inflation problem requires. The board's own split is the clearest signal of how close the call was. Three members wanted to hold, and the post-meeting statement dropped its explicit reference to further hikes.

Economists at UBS read that omission as "clearly dovish." The RBA may have judged that one more move was enough.

For a variable-rate mortgage holder, a 25 basis point rise adds roughly the cost of a small monthly bill on each loan. Consider a $600,000 variable loan over 25 years. At a 6.00% rate, the monthly repayment is about $3,866. Moving the rate up 0.25 percentage points to 6.25% lifts the repayment to about $3,947, an increase of around $81 a month, or roughly $970 a year.

The practical advice is to plan for a higher-for-longer cash rate rather than a quick reversal. Build a buffer equal to at least one or two rate rises into your budget, and check whether your lender will pass on the full move or absorb part of it. Savers benefit more directly.

Term deposit and high-interest savings rates tend to follow the cash rate with a lag, so it is worth comparing offers now rather than rolling over at the old rate. Our recommendation: if your repayments would become unaffordable at another 0.5 percentage points, act now by refinancing to a lower rate or building an offset balance.

If you have room in your budget, the RBA's signal that further hikes are less likely is a reasonable basis for holding steady.

The hike is justified. The inflation data, particularly trimmed mean at 3.6% and a forecast path above 3% into late 2027, gave the board a credible reason to act, and the governor's framing of acting early to avoid greater pain is sound central bank logic.

But the margin for error is thin. A split board, a dovish reading of the statement, and five hikes still working their way through household budgets all suggest the RBA is close to the point where further tightening could overshoot. The Reserve Bank is right to act, and right to avoid promising more.