The renewed conflict between the United States and Iran may appear geographically distant from Australia, but the involvement of Yemen’s Houthi forces brings the risk much closer to global trade routes, fuel markets and Australian business costs.

The immediate concern is no longer confined to the Strait of Hormuz.

The Houthis have threatened shipping near the Bab el-Mandeb Strait, the narrow entrance connecting the Red Sea with the Gulf of Aden. Tankers carrying Saudi crude have reportedly changed course following Houthi threats, while insecurity around the Strait of Hormuz has already reduced shipping activity and increased risks for vessels.

For Australian businesses, this creates several interconnected risks.

Oil prices are only the beginning

Australia does not need to purchase oil directly from Iran to be affected by the conflict.

Crude oil and refined fuels are traded through international markets. When tankers are delayed, redirected or exposed to attack, the cost of transporting and insuring energy shipments rises.

Brent crude moved above US$91 a barrel following the latest escalation, according to Reuters. The International Energy Agency has also warned that disruption to Middle Eastern oil and gas flows has major implications for energy security, affordability and the global economy.

Australian businesses may therefore experience higher diesel, petrol and aviation fuel costs even when physical supplies remain available.

Fuel-intensive industries would feel the pressure first:

Transport and logistics companies face higher fleet expenses.

Farmers and contractors face increased machinery and freight costs.

Airlines and tourism operators may face higher aviation costs.

Construction businesses may pay more to transport materials and operate equipment.

Retailers and manufacturers may face higher distribution and supplier charges.

The cost may begin at the fuel pump, but it does not end there.

Freight routes become longer and more expensive

The Red Sea is an important route between Asia, Europe and the Mediterranean.

When shipping companies consider the area unsafe, vessels may be diverted around the Cape of Good Hope at the southern end of Africa. This can add substantial distance, fuel consumption and time to a voyage.

The Houthis do not need to stop every ship to disrupt trade. A credible threat may be enough for shipping companies, insurers and crews to avoid the region.

The Bab el-Mandeb route accounts for a material share of world trade, and a prolonged disruption could increase shipping costs across industries that have no direct connection with Iran or the Middle East.

Australian importers could consequently face:

Longer delivery times.

Higher container and freight charges.

Additional insurance costs.

Less predictable arrival dates.

Greater pressure to hold more inventory.

These problems can be particularly difficult for smaller businesses, which generally have less purchasing power, less warehouse capacity and fewer alternative suppliers than major corporations.

Diesel may become the critical business issue

Public attention commonly focuses on petrol prices, but diesel can be more important to the wider economy.

Diesel powers trucks, agricultural machinery, mining equipment, generators and many commercial vehicles. It is also embedded in the cost of moving almost every physical product sold in Australia.

Current market pressure is not limited to crude oil. Refined fuel supplies and refining margins can also tighten, meaning diesel and petrol prices may rise more quickly than the underlying crude price.

This distinction matters to business owners.

A reduction in the headline oil price does not necessarily produce an immediate or equivalent reduction in the wholesale price of diesel.

Higher costs may be difficult to pass on

A business facing higher fuel or freight expenses has limited choices.

It can absorb the cost and accept a lower margin.

It can increase prices and risk losing customers.

It can reduce services, deliveries or operating hours.

It can renegotiate contracts with customers and suppliers.

Larger companies may have fuel hedging arrangements, long-term freight contracts or sufficient market power to pass on additional costs. Smaller businesses are more likely to purchase fuel and transport services at prevailing market prices.

That creates the possibility of uneven pressure across the Australian business sector.

A major retailer may negotiate lower freight rates. A small independent retailer importing the same category of goods may not.

Another inflation problem

Higher transport and energy costs can spread through the economy.

Suppliers increase prices to recover their expenses. Freight companies add surcharges. Businesses then pass some of those increases to consumers.

This can contribute to inflation even when domestic demand is weak.

For the Reserve Bank of Australia, imported energy inflation presents a difficult problem. Higher interest rates cannot reopen a shipping route or increase Middle Eastern oil production, but sustained fuel-related price increases may still influence inflation expectations and monetary policy.

For businesses already managing high borrowing costs, the combination of expensive fuel and restrictive interest rates would be particularly unwelcome.

What businesses can do

Australian businesses cannot control the conflict, but they can examine their exposure.

Operators should identify which costs are directly linked to fuel, freight or imported materials. They should also determine whether supplier contracts permit surcharges or sudden price adjustments.

Businesses dependent on imported stock may consider alternative suppliers or larger inventories, although holding additional stock also ties up working capital.

Freight-dependent businesses may need to review delivery schedules, minimum order sizes and the profitability of distant customers.

Contracts should also be checked carefully. Fixed-price agreements can become loss-making when transport and input costs rise unexpectedly.

The objective is not to predict the course of the conflict. It is to understand which parts of the business would be affected if disruption continues.

The Business Times View

The Houthi threat demonstrates how quickly a military conflict can become a business problem.

Australian companies may not trade with Iran, Yemen or Saudi Arabia, yet they remain connected through oil prices, shipping routes, insurance markets and international supply chains.

The first consequence is likely to be higher fuel and freight costs. The more important question is whether businesses can absorb those costs without cutting investment, employment or services.

For Australian business owners, the appropriate response is not panic. It is to identify exposure early, protect margins where possible and avoid assuming that international supply routes will continue operating normally simply because they are far from Australia.