The AUD/USD pair has been under sustained pressure through March, and while there are multiple factors at play, one thread keeps surfacing in every analysis: US trade policy. The latest round of tariff adjustments announced by the US administration is creating knock-on effects that hit the Australian dollar from several directions simultaneously.

Let me walk through the mechanics.

The Direct Trade Channel

Australia’s direct trade with the United States isn’t massive relative to its total trade volume — the US accounts for roughly 5% of Australian goods exports. So you might expect US tariffs to be a secondary concern for AUD traders. But that framing misses the bigger picture.

The tariffs announced in early March 2026 target a broad range of manufactured goods, including steel, aluminium, and processed minerals. While Australia has historically been exempt from some US steel tariffs, the new measures expand coverage and reduce exemption thresholds. More importantly, they signal a broader protectionist stance that affects global trade flows.

According to the Reserve Bank of Australia, trade uncertainty is one of the key downside risks identified in their February Statement on Monetary Policy. That uncertainty is now materialising in ways that make RBA rate decisions more complicated.

The China Transmission Effect

This is where the real AUD impact comes from. China buys roughly 35% of Australia’s total exports — iron ore, coal, LNG, and agricultural products dominating the mix. When US tariffs target Chinese goods, China’s export sector slows, factory output drops, and demand for Australian raw materials weakens.

The World Trade Organization estimated in its latest trade monitor that each 10-percentage-point increase in average US tariffs on Chinese goods reduces Chinese GDP growth by approximately 0.3-0.5 percentage points over 12 months. That translates directly into weaker commodity demand and, by extension, a weaker AUD.

We saw this dynamic play out clearly in 2018-2019 during the first US-China trade tensions. The AUD fell from roughly 0.78 to 0.67 over an 18-month period as trade uncertainty mounted. The current episode isn’t identical — China’s economy is structured differently now and has more domestic demand buffers — but the transmission mechanism is the same.

Risk Sentiment and the Carry Trade

The AUD is classified as a risk-on currency. When global uncertainty rises, investors tend to reduce exposure to higher-yielding currencies like the AUD and move toward safe havens — the USD, JPY, and CHF. Tariff escalation is inherently uncertainty-generating, even before the actual trade effects materialise.

The VIX index, which measures expected US equity market volatility, has risen from around 16 in mid-February to over 22 as of mid-March. That’s not panic territory, but it’s elevated enough to discourage new carry trade positions in AUD.

For retail forex traders, this means the interest rate differential that normally supports the AUD (the RBA cash rate currently sits above the Fed funds rate in real terms) is being offset by risk premium demands. You’re getting paid to hold AUD, but you’re also being exposed to potential capital losses that exceed the carry.

What the Options Market Is Saying

One useful signal for AUD direction comes from the options market. The 25-delta risk reversal for AUD/USD — which measures the difference in implied volatility between puts and calls — has shifted decisively toward puts in March. This means options traders are paying more to protect against AUD downside than to speculate on AUD upside.

As of last week, the 1-month risk reversal sat at roughly -1.8 volatility points, compared to -0.5 in early February. That’s a meaningful shift suggesting that institutional players are positioning for further AUD weakness, or at least hedging against it.

The Team400 research team has noted that options market data often leads spot FX moves by several weeks, making risk reversals a particularly useful early indicator for directional bias.

Practical Implications

If you’re an Australian importer paying in USD, the current environment argues for increasing your hedging coverage. The combination of tariff uncertainty, China transmission risk, and institutional positioning against the AUD suggests that the path of least resistance is lower, at least through to the next major catalyst — likely the RBA’s April meeting or any US-China trade negotiation developments.

If you’re an exporter receiving USD, the weaker AUD is actually positive for your revenue in local currency terms. But don’t get complacent — tariff-driven currency moves can reverse quickly if negotiations produce unexpected outcomes.

For speculative traders, the signal is mixed. The fundamental case for AUD weakness is clear, but the AUD is already at relatively depressed levels around 0.62-0.63, which means much of the bad news may already be priced in.

What to Watch

Three things will determine AUD/USD direction over the coming weeks. First, any escalation or de-escalation in US-China trade rhetoric. Second, Chinese economic data — particularly the March PMI readings due at month-end. Third, whether the RBA adjusts its forward guidance at the April meeting in response to deteriorating global conditions.

The tariff situation is fluid, and the FX market is pricing in continued uncertainty. That’s not a prediction of collapse — it’s a pricing of risk. And right now, the risk is tilted to the downside for the Australian dollar.