What a US–Iran Conflict Means for Markets and Expats

When tensions rise between the United States and Iran, it naturally creates concern—not just politically, but financially.

For investors, the key question is simple: what does this actually mean for markets, money, and everyday life?

The answer is more nuanced than headlines suggest.

Markets Move on Uncertainty, Not Just Events

Financial markets do not wait for events to happen. They react to what investors expect.

When the risk of conflict rises:

• Investors often sell riskier assets, such as shares

• Money moves into safer options, like gold and government bonds

• Market volatility can increase quickly

These market moves are often driven more by emotion than by economic fundamentals. As a result, prices can swing sharply even before there is any real economic damage.

Oil: The Critical Link Between Conflict and Markets

The single most important factor in a US–Iran conflict is oil.

Iran sits close to the Strait of Hormuz—a narrow shipping route through which roughly 25% of global oil supply passes. Any disruption here can send oil prices higher very quickly.

Why Oil Prices Matter So Much

Higher oil prices affect nearly everything:

• Transport and logistics costs rise

• Manufacturing becomes more expensive

• Inflation increases

• Consumer spending power falls

This creates a chain reaction across the global economy.

Sector Shifts: Not All Markets React the Same

Conflict does not affect all sectors in the same way. Markets often do not fall across the board—they shift.

Sectors that may benefit:

• Energy and oil producers

• Defence companies

• Gold and commodity producers

Sectors that may struggle:

• Airlines and travel businesses

• Retail and consumer brands

• Economies that rely heavily on imports

Understanding this shift is important. Market downturns are rarely even, and some sectors can rise while others fall.

A Global Ripple Effect

Even if the conflict is geographically distant, the financial impact is global.

1. Inflation Pressure

Countries like the UK are highly exposed to global energy prices. Rising oil often leads to:

• Higher fuel and energy bills

• Increased cost of living

• Pressure on household budgets

2. Interest Rates Stay Higher for Longer

If inflation rises again:

• Central banks may delay rate cuts

• Borrowing costs remain elevated

• Economic growth can slow

You can learn more about how interest rates affect your finances in our guide.

3. Currency Movements

In uncertain times, the US dollar tends to strengthen.

This can result in:

• Weaker local currencies

• More expensive imports

• Additional inflation pressure

What This Means Specifically for Expats

For expats, the impact can feel more immediate and personal.

Currency Risk Becomes More Important

If you earn in one currency but spend or invest in another:

• A 5–10% currency swing can significantly change your effective income—especially if you earn in USD but spend in GBP or AED.

• Cross-border transfers may become more expensive.

A stronger US dollar, for example, can reduce purchasing power in many regions.

Use our currency exchange calculator to get the best rate to make your money go further.

Cost of Living Abroad May Rise

Expats in oil-importing countries may notice:

• Higher fuel and transport costs

• Increased rent and food prices

• More expensive schooling or services

Plan for the future with education planning and savings to ensure you have peace of mind.   

This can particularly affect those in emerging markets or countries heavily reliant on imports.

Investment Portfolios May Shift Unevenly

Expats often hold globally diversified portfolios. During conflict:

• Energy-heavy markets (like the UK’s FTSE 100) may hold up better

• Growth-focused markets may experience more volatility

This can lead to uneven performance across regions.

Repatriation and Financial Planning Considerations

Periods of instability often prompt expats to review:

• Where their assets are held

• Currency exposure

• Long-term residency, including repatriation, or retirement plans

Financial flexibility becomes increasingly valuable.

What History Tells Us

Looking at past conflicts, including the Gulf War, can give useful perspective.

Markets have often followed a similar pattern:

• An initial drop driven by uncertainty

• Stabilisation as the situation becomes clearer

• Recovery if economic damage remains limited

The key factor is usually oil supply. If energy continues to flow, long-term market damage is often limited.

Short-Term Noise vs Long-Term Reality

In the short term, investors can expect:

• Higher volatility

• Spikes in oil prices

• Stronger gold prices

• Currency fluctuations

Over the long term, markets are driven by:

• Corporate earnings

• Economic growth

• Innovation and productivity

Geopolitical events can cause short-term disruption, but they rarely change these core drivers in a lasting way.

Practical Guidance for Investors

Periods like this test discipline. A few principles remain consistently valuable:

• Avoid panic decisions—markets often overreact early

• Maintain diversification across regions and sectors

• Be mindful of currency exposure, especially if living abroad

• Keep liquidity for flexibility if needed

• Review your plan—but don’t abandon it

For expats in particular, aligning investments with future currency needs is critical.

Should You Be Worried?

Concern is understandable—but panic is rarely justified.

A US–Iran conflict would likely:

• Increase market volatility

• Push oil prices higher

• Create short-term economic pressure

Recent events show exactly this pattern, with oil prices rising and markets becoming more volatile as tensions escalate.

However, history shows that unless energy supply is disrupted for a long period, global markets usually adjust.

Short-term shocks often fade as uncertainty reduces and supply becomes more stable.

The Bottom Line

The real risk is not the headlines—it is how investors react to them.

For both local investors and expats, the most effective approach remains the same:

• Stay diversified

• Stay disciplined

• Stay focused on long-term goals

Markets may react quickly, but they have recovered over time.

The goal is not to predict every event. It is to be prepared for them.

If you would like help reviewing your portfolio or managing your currency exposure, speak to a Holborn Assets adviser.