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Andy Home: US aluminium consumers are paying the rising cost of tariffs.

The price of physical aluminium in the United States is now 68% higher than that on the London Metal Exchange.

It is obvious that this is a direct result of President Donald Trump increasing import tariffs in March from 10% to 25 % and then again in June to 50 %.

The "all-in price" of aluminum is now above $5,000 per metric tonne, due to the additional $560 that the physical delivery premium in the Midwest U.S. adds to the implied tariff costs.

Metals are in short supply across many industries, from construction to packaging and automotive.

On paper, the record-high premium for U.S. deliveries should bring in much needed supply. However, in reality, the situation may not be as simple.

Imports down, Stocks shrink

After a long period of decline, which saw only four smelters operating, tariffs were intended to stimulate the domestic primary aluminum production.

Century Aluminum has only restarted 50,000 tons at its Mt. Holly plant located in South Carolina. By June, the smelter should be back to its full capacity.

Even if they are able to compete with Big Tech in the long-term for power supplies, there are still several years before these projects can produce their first metal.

The U.S. is still dependent on primary metal imports, which are falling. Volumes fell by 14% between 2024 and the first 10 month of 2025.

Around May of last year, Canada, historically, the biggest supplier to the U.S. Market, began?diverting its shipments to Europe.

According to World Bureau of Metal Statistics, between May and October, the Netherlands exported 225,000 tons of metal, Italy 89,000 tons, and Poland 29,000 tons.

The U.S. primary metal stocks have been declining.

According to Harbor Aluminum and Wittsend Commodity Advisors, the?short period between tariff increases didn't permit much preemptive inventory building. In-country inventories have shrunk, from 750,000 tones at the beginning of 2025, to below 300,000.

The increased U.S. premium should be a warning sign that the country is in need of more aluminum.

Cross-Atlantic Competition

However, the problem for U.S. purchasers is that Europe also lacks aluminium. The European duty-paid premiums over LME cash have risen from less than $200 per ton in June to more than $340 per ton.

Triple supply cuts are putting pressure on the region.

South32's decision, due to high electricity prices, to mothball?Mozal Aluminium Smelter in Mozambique removes an important supplier for the European market.

A second supplier, the Grundartangi Smelter in Iceland owned by Century Aluminum, reduced production by two thirds due to an?equipment breakdown' in late October. The recovery will take approximately 11-12 months.

In line with the 16th package of sanctions from the European Union, all imports of Russian metal will be stopped this year. The European Union granted European buyers a grace period of one year to phase out the imports. This grace period expires on next month.

Carbon Border Adjustment (CBAM) is also a factor that has contributed to the rise in local premiums. This mechanism, which was implemented this month by Europe, raises import prices for products with a higher carbon footprint.

CAPPED SUPPLY

Traders used to simply buy up LME stock and ship them to the United States in order to profit from premium spikes.

However, Russian metal is a large part of LME tonnage registered, 58% at the end of December. It cannot be imported into the U.S. due to sanctions.

There is also much less aluminum in LME's warehouses today than there was in the past when the global market exhibited a persistent oversupply.

The total LME stock, both registered and stored in shadows off-warrant, was 669,000 tonnes at the end of 2025, down 331,000 tons from the beginning of the year.

This speaks to structural changes that are taking place in the global marketplace.

Chinese operators have now reached or are very near the maximum output mandated by the government.

According to the International Aluminium Institute, Chinese production growth has slowed down from 4% in 2024 to only 2% last Year.

Yet, smelter margins are highly profitable. The price of aluminium has been increasing, but the price of alumina, an intermediate product has plummeted. This is the kind of combination that once would have triggered a rush to restart and build new capacity, but no longer.

China imports more and more primary metal. The volume of metals imported by China increased 19% on an annual basis in the first eleven months of 2025. A large portion of the inbound volume came from Russia. Due to sanctions, Russia has shifted away from Western buyers.

China's semi-manufactured products exports fell by 11% during the same time period. This is due to the end of the tax exemption on outbound shipments, which will take place in December 2024.

Global markets are tightening. This process is complicated by the simultaneous fragmentation of prices between regions.

FLOW-THROUGH

If the impact of tariffs on U.S. prices were to be isolated, physical arbitrage would quickly resolve it.

But it isn't. The physical aluminium industry is a complex one, and there are many moving parts. Right now they are all working together to reduce supply.

It is not good news for consumers that the price of aluminum in the U.S. has increased.

The Trump administration’s August extension of tariffs of 50% to a broad spectrum of aluminum products has kept midstream processing companies onside, but also serves to accelerate the transfer of higher primary metal prices to the ultimate purchaser.

Imports must pick up quickly or U.S. consumer will be in for a surprise.

Andy Home is an author and columnist. These opinions are Andy Home's. Open Interest (ROI) is your new essential source of global financial commentary. Follow ROI on LinkedIn and X. Listen to the Morning Bid podcast daily on Apple, Spotify or the app. Subscribe to the Morning Bid podcast and hear journalists discussing the latest news in finance and markets seven days a weeks.

(source: Reuters)