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.

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.

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.

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.

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 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.

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Here is the situation as April begins. A war is affecting one of the world's most important oil chokepoints. Brent crude is trading above US$100. And the Federal Reserve (Fed), which spent much of 2025 engineering a soft landing, is now facing an inflation threat driven less by wages, services or the domestic economy, and more by energy. It is watching an oil shock.

The Fed funds rate sits at 3.50% to 3.75%. The next Federal Open Market Committee (FOMC) meeting is on 28 and 29 April and the key question for markets is not whether the Fed will cut, it is whether the Fed can cut, or whether the energy shock may have shut that door for much of 2026.

A heavy run of major data releases lands in April. The March consumer price index (CPI), non-farm payrolls (NFP) and the advance estimate of Q1 gross domestic product (GDP) are the three that matter most. But the FOMC statement on 29 April may be the release that sets the tone for the rest of the year.

Growth: Business activity and demand

Think about what the US economy looked like coming into this year: AI-driven capital expenditure (capex) was a major part of the growth narrative, corporate investment intentions looked firm and the One, Big, Beautiful Bill Act was already in the mix. On paper, the growth story looked solid.

Then the Strait of Hormuz situation changed the calculus. Not because the US is a net energy importer, it is not, and that structural insulation matters. But what is good for US energy producers can still squeeze margins elsewhere and weigh on global demand. The 30 April advance Q1 gross domestic product (GDP) estimate is now likely to be read through two lenses: how strong was the economy before the shock, and what it may signal about the quarters ahead.

Labour: Payrolls and employment

February's jobs report was, depending on how you read it, either a blip or a warning sign. Non-farm payrolls (NFP) fell by 92,000, unemployment edged up to 4.4% and the official line was that weather played a role. That may be true but here is what also happened. The labour market suddenly looked a little less convincing as the main argument for keeping rates elevated.

The 3 April employment report for March is now genuinely consequential. A bounce back to positive payroll growth would probably steady nerves and a second consecutive soft print, particularly against a backdrop of higher energy prices, would start to build a very uncomfortable narrative for the Fed. It would be looking at slower jobs growth and an inflation threat at the same time. That is not a comfortable place to be.

Inflation: CPI, PPI and PCE

Here is the uncomfortable truth about where inflation sits right now. Core personal consumption expenditures (PCE), the Fed's preferred gauge, was already running at 3.1% year on year in January, before any oil shock had fed through. The Fed had not fully solved its inflation problem, rather, it had slowed it down. That is a different thing.

And now, on top of a not-quite-solved inflation problem, oil prices have moved sharply higher. Energy prices can feed into the consumer price index (CPI) relatively quickly, through petrol, transport and logistics costs that can eventually show up in the price of nearly everything. The 10 April CPI print for March is probably the most important single data release of the month, it is the one that may tell us whether the energy shock is already showing up in the numbers the Fed watches.

Policy, trade and earnings

April is also the start of US earnings season, and this quarter's results carry an unusual amount of weight. Investors have been pouring capital into AI infrastructure on the basis that returns are coming. The question is when. With geopolitical volatility driving a rotation away from growth-oriented technology and towards energy and defence, JPMorgan Chase's 14 April earnings will be read as much for what management says about the macro environment as for the numbers themselves.

Then there is the FOMC meeting on 28 and 29 April. After the early-April run of data, including NFP, CPI and producer price index (PPI), the Fed will have more than enough information to update its language. Whether it signals that rate cuts could remain on hold through 2026, or whether it leaves the door slightly ajar, may be the most consequential communication of the quarter.

Geopolitical volatility has already pushed investors to reassess growth-heavy positioning. The estimated US$650 billion AI infrastructure buildout is also coming under heavier scrutiny on return on investment. If earnings season disappoints on that front, and if the FOMC signals a prolonged hold, the combination could test risk appetite heading into May.

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Asia-Pacific markets start April with a focus on how prolonged disruption in the Strait of Hormuz feeds through to inflation, trade flows, and policy expectations. China's 15th Five-Year Plan shifts attention toward artificial intelligence and technological self-reliance, with knock-on effects for supply chains and regional growth. Japan and Australia both face the challenge of managing imported energy inflation while gauging how far they can normalise policy without derailing domestic demand.

For traders, the mix of elevated energy prices and policy divergence may keep volatility elevated across regional indices and currencies.

China

Lawmakers in Beijing have approved the 15th Five-Year Plan (2026-2030), placing artificial intelligence (AI) and technological self-reliance at the centre of the national agenda. The government has set a growth target of 4.5% to 5.0% for 2026, the lowest in decades, as it prioritises quality of growth over speed.

Japan

The Bank of Japan (BOJ) faces increasing pressure to normalise policy as energy-driven inflation risks a resurgence. While consumer prices excluding fresh food slowed to 1.6% in February, the recent oil price spike may push the consumer price index (CPI) back toward the 2% target in coming months.

Australia

The Australian economy remains in a state of two-speed divergence, with older households increasing spending while younger cohorts face significant affordability pressures. Following the Reserve Bank of Australia's (RBA) rate increase to 4.10% in March, markets are highly focused on upcoming inflation data to assess whether additional tightening may be required.

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