Navigating US Tariffs in 2025: A Practical Guide for UK Businesses with American Exposure

The US tariff landscape has become one of the most complex and consequential compliance challenges for UK businesses with American operations or customers. Following significant legal and policy developments in 2025 — including expanded use of emergency trade powers and new Section 301 investigations — businesses sourcing goods from China, Malaysia, Thailand, or other Asian manufacturing hubs face material and rapidly evolving cost exposure.

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This article sets out the key frameworks, the most common areas of risk, and a practical approach to managing your tariff position.

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Understanding the Framework: Section 301, IEEPA, and Anti-Dumping

The US applies additional duties on imported goods through several overlapping mechanisms. Section 301 duties, originally introduced to address Chinese trade practices, apply additional tariffs — typically 7.5% to 25% — on a wide range of manufactured goods by HS code. These are separate from, and cumulative with, standard Most Favoured Nation (MFN) rates.

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More recently, the International Emergency Economic Powers Act (IEEPA) has been deployed to impose additional tariff layers rapidly and with limited notice. For businesses without a systematic compliance monitoring process, the first indication that rates have changed can be an unexpected invoice from a customs broker or a significant duty bill at import.

Anti-dumping and countervailing duty (AD/CVD) cases add a further layer of complexity, particularly for businesses importing paper, packaging, plastics, and seasonal goods — all areas that have seen significant enforcement activity.

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Building a Tariff Exposure Model

The starting point for any serious tariff management programme is a clear quantitative picture of your exposure. This means mapping your purchase orders and inventory to HS codes, identifying the country of origin for each product line (which may differ from the country of manufacture), and applying the correct cumulative duty rate to each.

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A well-constructed tariff model, built within your ERP or as a standalone analytical tool, will allow you to see your annualised duty burden by product, by supplier, and by country — and to model the impact of rate changes or sourcing shifts before they occur.

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Practical Risk Mitigation

Once you have a clear view of your exposure, there are several practical mitigation options to consider:

• Supplier diversification — shifting volume from high-tariff to lower-tariff origin countries, where product quality and lead times permit

• First Sale valuation — in some cases, US customs duties can legitimately be calculated on the manufacturer's price rather than the importer's price, reducing the dutiable value

• Classification review — ensuring HS codes are correctly applied; misclassification in either direction creates both financial and legal risk

• Bonded warehousing and Foreign Trade Zones — deferring duty payment until goods enter US commerce, improving cash flow

• Duty drawback — recovering duties paid on goods subsequently exported

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The Compliance Monitoring Imperative

Perhaps the most important lesson from the past two years is that tariff rates and regulations change with very little notice, and the consequences of non-compliance — or simply of failing to capture a new cost — can be severe. Businesses that rely on annual tariff reviews or their customs broker to flag changes are increasingly exposed.

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A systematic approach to regulatory monitoring, integrated into your finance and operations function, is now a commercial necessity rather than a compliance nicety. If your business has significant US tariff exposure and you would like to discuss your position, please contact us.