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AUD FX playbook: RBA hike is priced. What comes next matters more
Key points:
- The RBA is expected to hike 25bp to 4.60% on Tuesday, with markets pricing roughly a 95% probability. That means the hurdle for a sustained AUD rally is higher than simply delivering the hike.
- Inflation is the reason the RBA remains hawkish. Core inflation is still running above the 2–3% target, while Governor Michele Bullock has warned that upside inflation risks may be materialising as high energy prices meet persistent excess demand.
- AUD/USD is sitting at an important technical test around 0.7000–0.7025. For a cleaner relative-rates expression, AUD/NZD may be more interesting, particularly if the RBA signals more tightening than the RBNZ.
Two events put AUD in the spotlight
The Australian dollar faces a concentrated run of domestic catalysts this week.
The RBA decision arrives Tuesday, 29 September at 12:30pm SGT, followed by Governor Bullock's press conference at 1:30pm SGT. The base case is increasingly straightforward: another 25bp hike, taking the cash rate from 4.35% to 4.60%. Markets recently assigned around a 95% probability to that outcome, after the RBA raised rates three times earlier this year.
That makes the decision less about whether the RBA hikes and more about whether 4.60% is the peak.
Bullock has recently said inflation risks may be materialising, pointing particularly to energy prices and excess demand. Core inflation remains at 3.6%, while unemployment at 4.5% has not weakened enough to remove inflation concerns.
So traders should listen for whether the RBA retains language suggesting another hike may be necessary.
Then comes inflation
Just 21 hours after the RBA decision comes another important test: August CPI at 9:30am SGT on Wednesday.
That creates an unusual two-stage AUD setup.
The RBA can deliver a hawkish message Tuesday, only for Wednesday's inflation numbers to reinforce, or challenge, it. July headline CPI was 3.5% y/y and stronger than expected, with core inflation also surprising higher.
For AUD, therefore, the strongest signal would not simply be a hike. It would be a hike + open door to further tightening + another firm inflation print.
AUD/USD: 0.7000 is the first battleground
AUD/USD has pulled back sharply from the September high around 0.7240 and is now testing an important support cluster.
The chart puts 0.7000–0.7025 in focus: the 61.8% retracement sits around 0.7007, the 200-day moving average near 0.7026, and the psychological 0.7000 level is just underneath.
That makes the RBA an important test of whether the broader AUD recovery survives.
Scenario | AUD/USD positioning | Levels |
Hawkish RBA + firm CPI | Scope for AUD rebound as terminal-rate expectations move higher | Above 0.7055, watch 0.7095, then 0.7150. A larger recovery brings 0.7240 back into view |
Hike, but signals peak | Classic “buy the rumour, sell the fact” risk | Failure below 0.7055–0.7095 keeps pressure on 0.7000 |
Dovish surprise / softer CPI | Break of the support cluster would weaken the technical picture | Below 0.7000, watch 0.6950, with a deeper retracement potentially towards 0.6865 |
The complication for AUD/USD is the US side of the equation. US yields remain elevated and the Fed has also turned more hawkish. So even a hawkish RBA does not automatically mean a weaker USD.
That is why AUD/NZD may offer the cleaner expression of the Australian story.
AUD/NZD: a purer RBA divergence trade?
AUD/NZD has already had a substantial run, rising from around 1.19 in August to almost 1.25, so positioning is less attractive than it was several weeks ago.
But the relative policy story remains interesting. The RBNZ raised rates to 2.75% in September, but signalled a slower tightening path than markets had anticipated. Markets still see another RBNZ hike as possible in October, but the Australian cash rate is already substantially higher and could reach 4.60% this week.
Technically, AUD/NZD remains above the 1.2355 23.6% retracement after failing around 1.2490.
A hawkish RBA and firm CPI could bring 1.2490 back into focus. A clean break would mark a fresh extension of the uptrend.
But this is also where chasing becomes risky. A break below 1.2355 would suggest the recent rally is correcting, putting 1.2270 and then 1.2200 in focus. A more substantial reversal brings the 1.2135–1.2155 moving-average cluster into view.
The trader takeaway
The biggest risk this week is assuming RBA hike = AUD higher. With a 25bp increase already heavily priced, the currency needs something more.
The bullish AUD combination is a hike, hawkish forward guidance and firm CPI, particularly if global risk sentiment remains constructive. The bearish combination is a hike accompanied by language suggesting the tightening cycle is largely complete, especially if Wednesday's CPI subsequently softens.
And there is an external wildcard: oil. Persistently high energy prices strengthen the RBA's inflation problem, but another sharp oil shock can simultaneously hurt global risk sentiment. That means the same catalyst that makes the RBA more hawkish does not necessarily translate one-for-one into a stronger AUD.
For traders wanting the cleanest distinction, AUD/USD is the global macro trade; AUD/NZD is closer to the relative central-bank trade.