Start with what actually happened to FX markets in the lead-up to April: there was a geopolitical shock and oil supply out of the Middle East came under pressure. The immediate reaction across currency markets was the one traders have seen before: money moved toward safety, toward yield, and away from anything that looked exposed to the disruption.
Safe-haven flows meet yield divergence
The US dollar benefited from both of those forces at once. It is a safe haven and it also carries a yield advantage that most of its peers cannot match right now. The Swiss franc picked up some of the overflow from European risk aversion. The yen, which used to attract safe-haven flows almost automatically, is stuck in a different situation altogether where the yield gap against the dollar is now so wide that safe-haven logic has been overridden by carry logic.
The currencies that had the toughest month were the ones caught in the middle: risk-sensitive, commodity-linked, or running policy rates that simply cannot compete. The New Zealand dollar is the clearest example while the Australian dollar is a messier story. Sitting underneath all of it is a repricing of 2026 rate cut expectations that central banks in multiple countries are now reassessing.
DXY context
Regained 100 on geopolitical risk
Strongest currency
USD — safe haven plus yield
Weakest currency
NZD — yield gap plus energy
Main central bank theme
Repricing of 2026 rate cut paths
Main catalyst ahead
Fed and BOJ policy meetings
Monthly leaderboard — biggest movers
01
USD
Rose sharply on safe-haven demand and higher for longer yield expectations.
Strong
02
CHF
Advanced strongly as the preferred European refuge from Middle East risk.
Up
03
JPY
Highly volatile; fell to 20-month lows before intervention commentary.
Volatile
04
AUD
Mixed; caught between domestic energy inflation and a hawkish RBA.
Mixed
05
NZD
Fell sharply; pressured by energy exposure and capital outflows.
Weak
Strongest mover: US dollar (USD)
The US dollar spent most of 2025 gradually losing ground as the Fed cut rates and the rest of the world played catch-up. That story stalled hard in late March. The Iran conflict changed the calculus, and the dollar reasserted itself in a way that reflects something real about its structural position in global markets.
The US exports oil and when energy prices rise, that is a terms-of-trade improvement, not a terms-of-trade shock. Most of the dollar's major peers sit on the other side of that equation. Add a policy rate range of 3.50% to 3.75% that now looks locked in for longer, and the dollar's advantage is both cyclical and structural at the same time. The US Dollar Index (DXY) has regained the 100 level but tThe question heading into April is whether it holds there or pushes further.
Key drivers
-
Safe-haven demand:
The Iran conflict directed flows into US assets across equities, Treasuries, and the dollar itself.
-
Yield advantage:
The federal funds rate at 3.50% to 3.75% provides a meaningful return floor relative to most peers, helping to sustain capital inflows.
-
Energy insulation:
The US position as an oil exporter creates a structural terms-of-trade benefit when oil prices rise sharply.
-
Rate cut repricing:
Market expectations for 2026 Fed cuts have been scaled back significantly, removing a key source of dollar headwinds.
What markets are watching next
The DXY's ability to hold above 100 is the near-term reference point. The 10 April CPI print is the most direct test. A reading above expectations may add further support, while a soft print could give traders reason to take some dollar positions off the table.
The main risks to the upside case are a sudden diplomatic resolution in the Middle East, which could reduce safe-haven demand quickly, or a labour market print on 3 April that is weak enough to revive recession concerns and push rate cut expectations higher again.
Weakest mover: New Zealand dollar (NZD)
If you wanted to design a currency that would struggle in the current environment, the NZD fits the brief almost perfectly. It is risk-sensitive. It is commodity-linked. It runs a policy rate of 2.25%, which sits below the Fed and now below the RBA as well. New Zealand is also an energy importer, so rising oil prices hit the trade balance and the domestic inflation outlook at the same time.
None of those things are new but the combination of all of them hitting at once, against a backdrop of a surging dollar and broad risk-off sentiment, has compressed the NZD in a way that is hard to ignore. The carry trade that once made NZD attractive has reversed as capital has been moving out, not in.
Key drivers
-
Energy import exposure:
Rising Brent crude hits New Zealand's trade balance directly and adds upside pressure to domestic inflation.
-
Yield gap:
The 2.25% Reserve Bank of New Zealand (RBNZ) policy rate sits below the Fed and the RBA, sustaining negative carry against both the USD and AUD.
-
Risk-off positioning:
As a commodity and risk currency, the NZD tends to underperform when global sentiment deteriorates.
-
Trade uncertainty:
Ongoing tariff related uncertainty continues to weigh on export sector confidence.
Risks and constraints
Any unexpected hawkish commentary from the RBNZ or a sharp decline in oil prices could provide some relief. A broader improvement in global risk appetite would also tend to benefit the NZD, given its sensitivity to sentiment shifts.
But the structural yield disadvantage is not going away quickly, and that may continue to limit the pair's recovery potential.
USD/JPY
USD/JPY is the pair that most clearly illustrates what happens when a currency's safe-haven status gets overridden by carry logic. The yen used to be the first port of call for traders looking for protection during geopolitical stress. That dynamic has been suppressed, and the reason is straightforward: you give up too much yield to hold yen right now.
The Bank of Japan (BOJ) policy rate sits at 0.75% while the Fed's sits at 3.50% to 3.75% and that gap does not encourage safe-haven flows. It encourages borrowing in yen and deploying elsewhere. So while the dollar rose on geopolitical risk, the yen fell on the same event. That is not how it is supposed to work, but it is how the maths works out when yield differentials are this wide.
USD/JPY is sitting near 159, which leaves it not far from the 160 level that Japan's Ministry of Finance has consistently flagged as a line requiring attention. The BOJ meeting on 27 and 28 April is now a genuinely live event.
Key events to watch
-
Tokyo CPI, 30 March (AEDT):
March inflation data. A strong read may build the case for BOJ action at the April meeting.
-
BOJ meeting, 27 and 28 April (AEST):
Markets are treating this as a live event. The quarterly outlook report may include updated inflation forecasts that shift rate hike timing expectations.
-
Intervention watch:
Japan's Ministry of Finance has been explicit about the 160 level. Actual intervention, or a credible threat of it, could trigger a sharp and fast reversal.
What could shift the outlook
A hawkish BOJ, actual FX intervention, or a softer US CPI print that reduces dollar support could all push USD/JPY lower from current levels. On the other side, a dovish hold from the BOJ combined with continued dollar strength could see the pair test 160 and potentially beyond, which would likely intensify the intervention conversation in Tokyo.
For traders watching AUD/JPY and other yen crosses, the BOJ meeting on 27 and 28 April carries similar weight. A hawkish shift tends to compress yen crosses broadly, not just USD/JPY.
Data to watch next
Four events stand out as the clearest potential FX catalysts in the weeks ahead. Each has a direct transmission channel into rate expectations, and rate expectations are driving much of the move in FX right now.
Key dates and FX sensitivity
Tokyo CPI
JPY pairs, USD/JPY · AEDT
A strong read may strengthen the case for a more hawkish BOJ at the April meeting.
US labour market (NFP)
USD pairs, AUD/USD, NZD/USD · 10:30 pm AEDT
A weak result could revive recession concerns and alter Fed pricing.
US CPI - March
USD/JPY, EUR/USD, gold · 10:30 pm AEST
The most direct test of whether inflation is easing fast enough to reopen the rate cut conversation.
BOJ meeting and quarterly outlook report
JPY crosses, AUD/JPY · AEST
The key policy event for yen crosses. Updated inflation forecasts may shift rate hike timing expectations.
Key levels and signals
These are the reference points that traders and policymakers are watching most closely. Each one represents a potential trigger for a shift in positioning or an official response.
-
◆
DXY 100.00
A psychologically and technically significant support level. Holding above it may sustain the dollar's current run across major pairs. A break below it would likely signal a broader sentiment shift.
-
◆
USD/JPY 160.00
Japan's Ministry of Finance has consistently referenced this level as a threshold requiring attention. Actual intervention, or a credible threat of it, has historically been capable of producing sharp and fast reversals in the pair.
-
◆
Brent crude US$120
A move to this level would likely intensify risk off behaviour across FX markets, putting further pressure on energy importing currencies including the NZD, EUR, and JPY.
-
◆
AUD/USD 0.7000
This level has historically attracted buying interest and may act as a near term directional reference for positioning in the pair.
Bottom line
The FX moves heading into April were shaped by a combination of geopolitical shock, yield divergence, and a repricing of central bank expectations that few had positioned for at the start of the quarter. The dollar's dual role as a high yielding and safe haven currency has put it in an unusually strong position, but that position is not unconditional.
One soft CPI print, one diplomatic breakthrough, or one labour market miss could change the tone quickly. Currency moves may remain highly data dependent and sensitive to overnight news flow from the Middle East, where developments can gap markets before the next session opens.
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