Goldman and CBA Now See an RBA Hike as Soon as September

Economists at Goldman Sachs Group Inc. and Commonwealth Bank now expect the Reserve Bank of Australia to raise interest rates as early as September after a hotter-than-expected Australian CPI print, abandoning forecasts of no change for the rest of 2026.

Australia's latest consumer price index reading has done in a single morning what months of central-bank commentary could not: it has broken the consensus that the Reserve Bank of Australia was finished moving for the year. Economists at Goldman Sachs Group Inc. and Commonwealth Bank now expect another increase in the cash rate as early as September, according to Bloomberg Markets, replacing prior calls for no change across the remainder of 2026.

That is a meaningful shift in posture rather than a tweak to a decimal point. Forecasting no change for the balance of a year is a statement that the inflation problem is, in the forecaster's view, structurally resolved. Pulling that call forward to a hike at the very next meeting says the opposite — that the disinflation the RBA had been counting on is not arriving on schedule, and that the risk of waiting now exceeds the risk of acting.

Why one inflation print carried so much weight

Central-bank watchers rarely rebuild a rate path on a single data point. They do it when the data point contradicts the story the path was built on. The economists' previous stance — steady policy through year-end — implicitly assumed inflation would keep grinding lower without further help from the cash rate. A hot CPI print removes that assumption's foundation, and the fastest way to restore credibility to a forecast is to add back the hike that was taken out.

The composition of the group making the call matters as much as the call itself. Goldman Sachs is a global house whose Australian rates view feeds into cross-market positioning by offshore investors. Commonwealth Bank is a domestic institution whose economics team is read closely by Australian corporates, mortgage brokers and retail depositors. When a global bank and a major domestic lender arrive at the same conclusion in the same news cycle, the shift tends to propagate quickly through swap pricing, bond desks and the mortgage market's expectations of what happens next.

It also raises the bar for the RBA itself. A central bank that says nothing after a hot print effectively ratifies the market's new expectation. If policymakers disagree with the September framing, they will need to push back explicitly — through speeches, board commentary or guidance — before the meeting arrives. Silence would be read as consent.

The channels an Australian repricing runs through

A move in expected policy rates does not stay in the rates market. It shows up in four places, more or less in order.

• The currency. Higher expected short-term rates typically support the Australian dollar against currencies whose central banks are on hold or easing, because they widen the carry an investor earns for holding Australian assets. A firmer AUD, in turn, imports some disinflation by lowering the local-currency cost of imported goods — the mechanism the RBA would be counting on.
• Government bonds. Front-end yields respond first and hardest to a change in the near-term policy path. Longer maturities move less if investors believe the hike brings inflation back to target sooner rather than signalling a longer campaign.
• Rate-sensitive equities. Australia's listed market is heavily weighted toward banks and resources. For lenders, higher policy rates are a double-edged instrument: they can widen net interest margins while also raising the risk that borrowers fall behind, particularly in a housing market where variable-rate mortgages reprice quickly. For property trusts and other yield vehicles, higher risk-free rates raise the discount applied to future cash flows.
• Household cash flow. Australian mortgages tend to move with the cash rate faster than in markets dominated by long fixed-rate loans. Each increase lands on household budgets within a billing cycle or two, which is why domestic bank economists' forecasts get read as consumer news, not just market news.

What the reversal says about the global rate cycle

The Australian shift arrives at a moment when investors elsewhere have also been recalibrating how much inflation relief to expect. In the United States, equity benchmarks finished the session little changed. The S&P 500 tracker (NYSEARCA: SPY) closed at $766.08, up 0.02% from the prior close of $765.91 within a day range of $763.93 to $767.35, as of the last trade on Aug. 26, 2026. The Nasdaq 100 fund (NASDAQ: QQQ) ended at $711.37, up 0.09%, while the Dow 30 vehicle (NYSEARCA: DIA) closed at $534.23, down 0.19%. That is the profile of a market waiting for confirmation rather than one making a directional bet on the global inflation path.

The broader lesson for investors is about the fragility of "on hold" as a forecast. Through this cycle, the assumption that policy has peaked has been reversed more than once by data that refused to cooperate. An RBA that hikes in September would be a reminder that terminal rates are estimates, not commitments, and that the last leg of disinflation is where forecasting error concentrates.

What to watch between now and the September meeting

Three things will decide whether the new consensus survives contact with the RBA.

First, official commentary. Any explicit reference by policymakers to inflation persistence, or to the risk of expectations drifting, would validate the September call. Language emphasising patience and lags would undercut it.

Second, the labour market. Wages and employment determine whether a hot goods-and-services print is a one-off or the leading edge of something more durable. A tight jobs market makes a hike easier to justify; visible cooling gives the RBA cover to wait.

Third, whether other forecasters follow. Two prominent houses changing their view creates a talking point; a broad migration across the sell side creates a market price. If swap markets settle on a September move, the RBA faces a choice between meeting that expectation and absorbing the volatility of disappointing it.

For investors positioned in Australian assets, the practical implication is that duration and currency exposure now carry more event risk into September than they did a week ago. For everyone else, it is a data point in a larger argument: the inflation fight is not over simply because forecasters had stopped writing hikes into their spreadsheets.

Key facts

• New forecast: RBA rate hike as early as September 2026
• Forecasters: Goldman Sachs Group Inc. and Commonwealth Bank economists
• Prior view: No change in the cash rate for the remainder of 2026
• S&P 500 tracker (SPY): $766.08, +0.02%, at the last trade Aug. 26, 2026, 20:00 GMT

Frequently asked questions

What changed in economists' RBA forecasts?

Economists at Goldman Sachs Group Inc. and Commonwealth Bank moved from expecting no change in Australia's cash rate for the rest of 2026 to forecasting another interest-rate increase as early as September. The trigger was a hotter-than-expected Australian consumer price index reading, which undermined the assumption that inflation would keep falling without further policy tightening.

Why does one CPI print change a whole rate forecast?

A forecast of no change assumes inflation is already on a reliable path back to target. A hot CPI print contradicts that assumption directly, so the forecast has to be rebuilt rather than adjusted. Economists respond by adding back the rate increase they had previously removed, because the risk of the central bank waiting too long has risen.

How would an RBA hike affect the Australian dollar?

Higher expected short-term interest rates generally support a currency, because investors earn more for holding assets denominated in it relative to currencies where central banks are on hold or cutting. A firmer Australian dollar also lowers the local-currency cost of imports, which itself helps cool inflation — part of the mechanism a rate rise is meant to trigger.

Which Australian equities are most sensitive to a rate rise?

Banks and property-linked stocks react most. Higher policy rates can widen lenders' net interest margins but also increase the chance borrowers fall behind, especially where variable-rate mortgages reprice quickly. Real estate trusts and other yield-oriented vehicles tend to fall because a higher risk-free rate reduces the present value of their future cash flows.

What did US markets do on the same day?

US benchmarks closed nearly flat. As of the last trade on Aug. 26, 2026, the S&P 500 tracker ended at $766.08, up 0.02% from a prior close of $765.91. The Nasdaq 100 fund closed at $711.37, up 0.09%, and the Dow 30 vehicle finished at $534.23, down 0.19% — a market waiting for confirmation rather than taking a view.

What signals would confirm or kill the September hike call?

Three things matter: explicit RBA commentary about inflation persistence would validate it, while language stressing patience and policy lags would undercut it. Labour-market data showing continued tightness supports a hike. And whether other forecasters and swap markets converge on September determines whether the call becomes a market price the RBA must respond to.

Sources

• Economists See RBA Rate Hike as Early as September After Hot CPI — Bloomberg Markets

Photo: Dương Nhân · Pexels Licence — source