How Tariffs on Aluminum and Steel Work
Tariffs on aluminum and steel are duties levied by the U.S. government on imported metals. They raise the landed cost of foreign-produced aluminum and steel, aiming to protect domestic producers. The primary authority today is Section 232 of the Trade Expansion Act of 1962, which allows the president to impose import restrictions on metals deemed a threat to national security. The resulting duties function like a sales tax on imported metal: they are collected at the port of entry and passed down the supply chain to buyers, builders, and consumers.
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Because aluminum and steel are foundational inputs in construction, automotive, packaging, and energy, tariffs on aluminum and steel ripple far beyond the metals themselves. A duty on imported coil steel or aluminum billet raises the cost of everything from household appliances to bridge girders.
Section 232 Rates and Exclusions
Current Section 232 rates are 25% on steel and 10% on aluminum. These rates apply to most articles of iron or aluminum, including raw materials, semi-finished products, and certain finished goods. The rates are ad valorem, meaning they are calculated as a percentage of the declared customs value.
The administration maintains several exclusion processes. Companies can apply for a Section 232 exclusion if a specific product is not available domestically or if adding duties would cause severe economic harm. Exclusions are product-specific and time-limited, requiring renewal. Importers should track the Federal Register for exclusion announcements and deadlines, because using a duty-rate lookup table without checking active exclusions can lead to overpayment or, worse, post-entry liability.
Who Pays When Tariffs on Aluminum and Steel Rise
The statutory burden falls on the importer of record, but the economic burden shifts through the supply chain. U.S. mills raise prices on domestic metal to capture the advantage created by foreign competitors' higher costs. Downstream manufacturers and construction firms absorb those higher input prices, often passing them to end customers through higher product prices.
Small manufacturers that lack scale are especially exposed to tariffs on aluminum and steel. They may not have the purchasing power to negotiate fixed-price contracts or the capital to absorb short-term cost spikes, making them more dependent on exclusion requests or sourcing shifts.
Trading Partners and Retaliatory Measures
Tariffs on aluminum and steel have triggered retaliation from trading partners. The European Union, China, Canada, Mexico, and others have imposed counter-tariffs on U.S. exports, ranging from agricultural products to industrial goods. These retaliatory duties affect American exporters and create uncertainty for global supply chains.
For example, EU counter-tariffs have targeted aluminum and steel products exported from the United States, while also hitting American agriculture and manufacturing goods. The result is a double exposure for U.S. firms that both import metal and export finished products.
Compliance and Risk Management
Companies that import aluminum and steel should build a tariff-compliance process around three pillars:
- Classification: Correctly assign HTS codes to each product, as different forms of aluminum and steel carry different duty rates and exclusion eligibility.
- Origin determination: Verify the country of origin, since Section 232 duties apply based on where the metal was smelted or processed, not where it was fabricated.
- Exclusion monitoring: Track active exclusions and file timely renewal requests before they expire.
Many firms also use tariff engineering, adjusting product specifications or sourcing routes to reduce exposure. Careful engineering can legally lower the effective duty rate without violating trade laws.
Looking Ahead
Tariffs on aluminum and steel remain a central feature of U.S. trade policy. Rates and exclusions can change with presidential directives and new negotiation outcomes. Businesses that treat metal tariffs as a recurring cost variable, not a one-time event, will be better positioned to manage margins, secure supply, and avoid penalties.