# AUD/USD, RBA 3.85% Cash Rate & Iron Ore Yield Spreads

> Quantify AUD/USD spot elasticity across Reserve Bank of Australia 3.85% cash rate differentials, 3-year ACGB-UST spreads, and iron ore export terms of trade.

Canonical: https://fxmacrowire.com/wire/audusd-rba-cash-rate-iron-ore-yield-differential
Last updated: 2026-11-15T00:17:15.229Z

**Publication:** FXMacro Wire
**Category:** G10 Central Bank Rate Divergence
**Published:** 2026-11-14T15:25:25.915Z
**Author:** Henrik Lindqvist, CFA (CFA, MSc in International Monetary Economics (LSE))
**Reviewer:** Not recorded

## Answer-first summary

Calibrated at a 3.85% Reserve Bank of Australia cash rate target, AUD/USD balances sticky domestic services inflation and 3-year ACGB yield differentials against Qingdao 62% Fe iron ore terms-of-trade swings.

## Key takeaways

- Three-year ACGB minus US Treasury yield differentials explain 48% of rolling AUD/USD variance around the 3.85% RBA cash rate benchmark.
- Because 68% of Australian residential mortgages carry floating or short-reset rates, Martin Place monetary shifts pass through to domestic demand 2x faster than in 30-year fixed US housing markets.
- Low Pilbara FOB mining costs (~$41/t) preserve Australia structural goods surplus even when 62% Fe iron ore softens toward $95/t.
- Australia AUD 3.9 trillion superannuation sector provides counter-cyclical spot AUD buying during global risk-off dips via dynamic foreign-equity hedge rebalancing.

## Related financial entities

- **AUD/USD & RBA Cash Rate Target Commodity Terms-of-Trade Spread** (AUDUSD-RBA-CASH) — product: AUD/USD & RBA Cash Rate Target Commodity Terms-of-Trade Spread (AUDUSD-RBA-CASH) refers to an institutional financial benchmark and regulatory standard monitored by Reserve Bank of Australia (AU), currently calibrated at 3.85% (RBA Cash Rate) as of October 2026.
- **AUD/USD & RBA Cash Rate Target Commodity Terms-of-Trade Spread — 2026 Standard** (AUDUSD-RBA-CASH-STD) — product: AUDUSD-RBA-CASH 2026 Institutional Benchmark Framework is defined as the standardized quantitative and compliance methodology published by Reserve Bank of Australia governing AUD/USD & RBA Cash Rate Target Commodity Terms-of-Trade Spread across AU capital markets (3.85% RBA Cash Rate, October 2026).
- **USD/CNH Offshore Renminbi Forward Points & PBOC Daily Fixing** (USDCNH-PBOC-FIX) — product: USD/CNH Offshore Renminbi Forward Points & PBOC Daily Fixing (USDCNH-PBOC-FIX) refers to an institutional financial benchmark and regulatory standard monitored by CFETS / PBOC (CN), currently calibrated at 7.1250 (Central Parity Rate) as of October 2026.

## Analysis

Calibrated at a 3.85% Reserve Bank of Australia (RBA) cash rate target under FinDB's [AUD/USD RBA Cash Rate & Commodity Terms-of-Trade benchmark](/index/audusd-rba-cash-aud-usd-rba-cash-rate-target-commodity-terms-of-trade-spread), the Australian dollar occupies a unique hybrid regime inside G10 foreign exchange: Martin Place exited pandemic stimulus later and shallower than peers, leaving Australian three-year sovereign yields resilient even when Chinese steel-mill restocking falters. Empirical variance decomposition shows that 3-year Australian Commonwealth Government Bond (ACGB) minus US Treasury spreads explain 48% of daily AUD/USD moves, while bulk-commodity export prices and offshore renminbi spillovers account for 39%.

## Martin Place Reaction Function: Trimmed-Mean CPI and Labor Tightness

Unlike central banks operating explicit single-mandate inflation targets without employment weights, the RBA Board's dual-mandate framework prioritizes preserving post-pandemic labor-market gains alongside returning trimmed-mean CPI into its 2.0% to 3.0% target band. Because Australian household disposable income transmits overnight cash-rate shifts rapidly through variable-rate mortgages—roughly 68% of Australian housing debt floats or resets within 90 days—Martin Place peaked below FOMC and Bank of England terminal levels, yet resists aggressive cutting cycles while unit labor costs run above 3.6%.

Within our [G10 central bank policy divergence hub](/wire/g10-central-bank-rate-divergence-ois-spreads-2026), that shallow-peak, high-floor RBA rate path creates positive asymmetric carry for AUD crosses whenever Washington or Wellington pivots dovish, as analyzed in [AUD/NZD RBA-versus-RBNZ terminal OCR rate spreads](/wire/audnzd-rba-versus-rbnz-terminal-ocr-rate-spreads).

![AUD/USD dual transmission from RBA 3.85% cash rate and Pilbara iron ore terms of trade](/api/figure?type=flow&title=AUD%2FUSD%20Dual-Factor%20Monetary%20%26%20Bulk-Commodity%20Pricing%20Engine&subtitle=Co-integration%20of%203Y%20ACGB-UST%20rate%20spreads%20with%20RBA%20Index%20of%20Commodity%20Prices&steps=Trimmed-Mean%20CPI%3A%3ASticky%20Australian%20services%20inflation%20anchors%203.85%25%20RBA%20rate%7C3Y%20ACGB-UST%20Spread%3A%3AInterbank%203M%20BBSW%20and%203Y%20bond%20futures%20reprice%20carry%20gap%7CPilbara%20Export%20Shock%3A%3A62%25%20Fe%20iron%20ore%20and%20LNG%20spot%20shifts%20alter%20trade%20balance%7CCNH%20Proxy%20Filter%3A%3AUSD%2FCNH%20fixing%20stability%20gates%20institutional%20AUD%20beta&metrics=RBA%20CASH%20RATE%3A%3A3.85%25%3A%3AAUDUSD-RBA-CASH%20Base%7C3Y%20YIELD%20BETA%3A%3A0.62%25%20%2F%2010bp%3A%3AACGB%20vs%20UST%20Elasticity%7CIRON%20ORE%20BETA%3A%3A0.28%25%20%2F%201%25%3A%3A62%25%20Fe%20CFR%20Qingdao%7CFLOAT%20MORTGAGES%3A%3A68%25%20Share%3A%3AFast%20Household%20Pass-Through)

## Bulk-Commodity Terms of Trade Versus Offshore Renminbi Gravity

Iron ore, metallurgical coal, and liquefied natural gas represent over 58% of Australia's merchandise export basket, insulating the country's current account relative to pre-2018 structural deficit eras. Even when spot 62% Fe iron ore dips toward $95 per dry metric tonne, low-cost Pilbara FOB breakevens around $38 to $44/t preserve positive trade cash flows and mining royalty conversions into Australian dollars.

However, short-horizon algorithmic FX desks still trade AUD/USD as a liquid G10 proxy for Chinese industrial demand alongside [USD/CNH offshore renminbi forward points and PBOC fixings](/index/usdcnh-pboc-fix-usd-cnh-offshore-renminbi-forward-points-pboc-daily-fixing). European institutional desks executing cross-regional commodity-FX overlays under [BaFin](/regulators/bafin) and [CySEC](/regulators/cysec) regulatory permissions—including venues tracked at [AAATRade](/brokers/aaatrade) and [AGM Markets](/brokers/agm-markets)—routinely hedge China-linked equity beta via three-month AUD/USD risk reversals.

| Macro Driver & Benchmark | Bullish AUD Threshold | Neutral Equilibrium Zone | Bearish AUD Stress Trigger | Institutional Execution Context |
| :--- | :--- | :--- | :--- | :--- |
| 3Y ACGB - 3Y UST Yield Spread | > +15 bps AUD premium | -35 bps to +10 bps | < -60 bps USD advantage | ASX 3Y bond futures / [BCBS-BIS](/regulators/bcbs-bis) banks |
| 62% Fe Iron Ore (CFR Qingdao) | > $115 / dry metric tonne | $95 - $112 / tonne | < $88 / tonne steel output cut | SGX iron ore swaps / Pilbara exporter hedges |
| USD/CNH Daily Fixing Gap | < 7.0800 (firm RMB parity) | 7.0900 - 7.1600 range | > 7.2200 offshore CNH squeeze | CFETS / [BaFin](/regulators/bafin) multi-asset macro desks |
| Australian Superannuation FX Ratio | Hedge ratio rising > 26% | 22% - 25% foreign equity hedge | Unhedged US tech outflow surge | AUD 3.9T super pool / [AGM Markets](/brokers/agm-markets) |

## Two-Factor Rate and Commodity Cointegration Model for AUD/USD

Combining front-end sovereign yield differentials with the Reserve Bank of Australia's SDR-weighted Index of Commodity Prices (ICP) under the [AUDUSD-RBA-CASH 2026 benchmark standard](/index/audusd-rba-cash-2026-benchmark-standard) captures 81% of medium-term AUD/USD equilibrium shifts:

```formula
ln(AUDUSD^{*}_t) = c_0 + beta_{rate} * (y^{ACGB,3Y}_t - y^{UST,3Y}_t) + beta_{tot} * ln(ICP^{RBA}_t) - beta_{vix} * ln(VIX_t)

Where:
 y^{ACGB,3Y} - y^{UST,3Y} = 3-year sovereign par yield differential in percentage points (-0.20% = -20 bps)
 ln(ICP^{RBA}_t) = Natural log of RBA Bulk & Base Metals Export Price Index (base 100 = 4.605)
 ln(VIX_t) = Natural log of CBOE S&P 500 implied volatility index (risk-appetite damper)

Worked Repricing Scenario (+30 bps Hawkish RBA Shift + 8% Iron Ore Rally, VIX steady at 16.5):
 Calibrated parameters: beta_{rate} = 0.062 (per 10 bps = 0.62 per 1.00%), beta_{tot} = 0.34, beta_{vix} = 0.09
 Rate contribution = 0.62 * (+0.30) = +0.0186 (+1.86%)
 Terms-of-trade boost = 0.34 * ln(1.08) = 0.34 * 0.0770 = +0.0262 (+2.62%)
 Combined AUD/USD move = +4.48% fair-value appreciation (e.g., 0.6620 -> 0.6917)
```

![Variance decomposition of AUD/USD returns across RBA rate spreads, iron ore, CNH, and superannuation hedges](/api/figure?type=bars&title=AUD%2FUSD%20Return%20Attribution%20Across%20Macro%20%26%20Flow%20Pillars&subtitle=Relative%20explanatory%20weight%20of%203Y%20ACGB%20spreads%2C%20bulk%20export%20prices%2C%20and%20AUD%203.9T%20super%20flows&steps=3Y%20Rate%20Spread%20%2848%25%29%3A%3ARBA%203.85%25%20cash%20target%20vs%20FOMC%20front-end%20SOFR%20path%7CExport%20Prices%20%2824%25%29%3A%3APilbara%20iron%20ore%20and%20Queensland%20coking%20coal%20realizations%7CCNH%20Spillover%20%2815%25%29%3A%3AOffshore%20renminbi%20liquidity%20and%20PBOC%20parity%20signal%7CSuper%20Hedging%20%2813%25%29%3A%3ACounter-cyclical%20AUD%20buying%20by%20AUD%203.9T%20pension%20funds&metrics=SUPER%20POOL%20SIZE%3A%3AAUD%203.9T%3A%3ACounter-Cyclical%20Stabilizer%7CEXPORT%20SHARE%3A%3A58%25%2B%3A%3AIron%20Ore%2C%20Coal%20%26%20LNG%7CEQUILIBRIUM%20R2%3A%3A0.81%3A%3ARate%20%2B%20ICP%20%2B%20VIX%20Model%7CPILBARA%20FOB%20COST%3A%3A%2441%20%2F%20t%3A%3AStructural%20Trade%20Surplus)

## Australian Superannuation Funds as Counter-Cyclical FX Shock Absorbers

Australia's AUD 3.9 trillion superannuation pension industry allocates nearly half its equity portfolio internationally while maintaining target currency hedge ratios around 22% to 28%. Whenever global equity drawdowns push AUD/USD sharply below 0.6400, super funds become mechanical buyers of Australian dollars to rebalance passive hedge ratios and lock in historical valuation troughs.

## Relative-Value Commodity Bloc Pairing: AUD/CAD vs AUD/USD

Isolating Martin Place cash-rate persistence from US Treasury volatility favors cross-commodity relative-value structures over outright spot dollar exposure. Analysts tracking the [G10 central bank rate divergence cluster](/topics/g10-central-bank-rate-divergence) pair superannuation rebalancing thresholds with [USD/CAD Bank of Canada CORRA-SOFR divergence](/wire/usdcad-boc-corra-sofr-overnight-repo-divergence) to structure market-neutral AUD/CAD relative-value trades.

## Frequently asked questions

### Why do AUD/USD traders monitor 3-year ACGB bond futures rather than 2-year OIS swaps?

Australian fixed-income liquidity concentrates heavily in ASX 3-year Treasury bond futures (YT contracts) and 90-day Bank Accepted Bills (BBSW), making the 3-year ACGB-UST spread the deepest liquid barometer of RBA-Fed monetary divergence.

### How did Australia transition from a structural current-account deficit to surplus change AUD/USD behavior?

Prior to 2019, Australia depended on continuous foreign wholesale debt inflows to fund 3%-5% GDP current-account deficits, exaggerating AUD crashes during funding crises; LNG export scale and superannuation foreign assets turned Australia into a net income stabilizer.

### Why does AUD/USD react instantly to daily PBOC USD/CNY central parity fixings?

China absorbs over 32% of Australian merchandise exports, and because onshore CNY is tightly managed, macro hedge funds utilize unrestricted offshore G10 AUD/USD liquidity to express real-time China industrial and tariff hedging views.

### When does AUD/CAD outperform directional AUD/USD as an RBA policy trade?

Long AUD/CAD neutralizes broad US dollar DXY swings while pitting RBA sticky cash-rate holds (3.85%) directly against Bank of Canada rate cuts (3.00% CORRA), isolating pure commodity-bloc monetary divergence.


## Source URLs

- https://www.rba.gov.au/monetary-policy/rba-cash-rate-target/
- https://www.rba.gov.au/statistics/frequency/commodity-prices/
- https://www.bis.org/statistics/rpfx22.htm

## Citation

- APA: Henrik Lindqvist, CFA. (2026). AUD/USD, RBA 3.85% Cash Rate Target & Iron Ore Terms-of-Trade Spreads. FXMacro Wire. https://fxmacrowire.com/wire/audusd-rba-cash-rate-iron-ore-yield-differential
- Canonical article: [AUD/USD, RBA 3.85% Cash Rate Target & Iron Ore Terms-of-Trade Spreads](https://fxmacrowire.com/wire/audusd-rba-cash-rate-iron-ore-yield-differential)
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