Donald Trump’s latest tariff declaration sounds distant from Wellington, but the economic aftershocks could arrive faster than many expect. The former US president says any country doing business with Iran will face an immediate 25 percent tariff on all trade with the United States. China is firmly on the list, and that is where New Zealand’s exposure lies.

New Zealand’s direct trade with Iran is negligible. In 2024, New Zealand exported about US$1.3 million worth of goods to Iran and imported roughly US$2.8 million. Total two-way trade sits near US$4 million a year. That figure barely registers against New Zealand’s annual exports of around NZ$60 billion. From Wellington’s point of view, Iran itself is not the problem.

The risk comes from Trump’s sweeping definition of punishment. He has not explained what qualifies as “doing business” with Iran. China, India, Turkey and the United Arab Emirates are all major Iranian trading partners. China alone buys large volumes of Iranian oil and supplies machinery, electronics and consumer goods to global markets.

China also buys about 28 percent of New Zealand’s exports, valued at roughly NZ$36 billion a year. That includes dairy, meat, timber and manufactured food products. Many Wellington-based firms depend on that trade, either directly or through national supply chains. When China is hit, New Zealand usually feels it within months.

If Chinese exports to the United States face a combined tariff rate of at least 45 percent, prices and trade flows will shift. Chinese producers may divert goods to other markets, including New Zealand. Cheaper imports could appear on shelves in the short term. Wellington consumers might welcome lower prices on electronics or household goods. Local manufacturers are unlikely to cheer.

During the last US–China trade war, New Zealand manufacturers reported cost swings of up to 8 percent due to price dumping and supply instability. Small Wellington factories and food processors struggled to compete with sudden surges of underpriced imports. Some cut staff hours. Others delayed investment.

Shipping costs are another concern. Around 60 percent of containerised imports into the lower North Island include Chinese content. Trade tensions usually raise insurance premiums and reroute shipping lines. In 2019, global freight rates jumped more than 30 percent in a single quarter. Wellington port fees and inland transport costs rose soon after.

Currency pressure adds another layer. Trade wars tend to strengthen the US dollar. A weaker New Zealand dollar makes imports more expensive. Treasury modelling shows that every one cent drop against the US dollar adds about NZ$150 million a year to New Zealand’s import bill. That flows through to fuel prices, packaging costs and retail margins. Wellington households notice it at the checkout.

Trump’s move also creates legal and political uncertainty. He relies on the International Emergency Economic Powers Act to impose tariffs. The US Supreme Court is expected to rule on that authority this month. If the court blocks him, the US could be forced to refund at least US$130 billion in tariff revenue. Markets dislike that level of instability, and smaller trade-dependent economies often feel the shock first.

Wellington’s public sector focus does not provide insulation. Government budgets depend on stable global growth. A one percent fall in global GDP typically cuts New Zealand’s GDP by about 0.3 percent, or close to NZ$1 billion. That affects tax revenue, infrastructure spending and public sector employment in the capital.

New Zealand has carefully balanced its relationships with Washington and Beijing. A tariff regime tied to Iran complicates that balance. Pressure to align with one side risks economic fallout on the other.

Trump says his order is final. Experience suggests trade wars rarely end cleanly. For Wellington, the message is clear. Even with only US$4 million in direct trade with Iran, global retaliation, higher costs and market volatility could land on local businesses and households. This is not distant politics. It is the price of groceries, freight and jobs in New Zealand’s capital.