Tariffs, Red Tape, and the Real Cost of Buying and Selling Across Borders: A Guide for UK SMEs

The changed world of UK trade

Before 2021, UK businesses buying from or selling to EU counterparts operated within a single market. No tariffs. No customs declarations. No certificates of origin. No phytosanitary checks. No rules of origin calculations. Goods moved freely, paperwork was minimal, and the cost of European supply chains was essentially identical to domestic ones for most product categories.

That world is gone. What replaced it is a customs border that — despite the Trade and Cooperation Agreement — generates real costs for every business that crosses it in either direction. And layered on top of the UK-EU friction is a wider global trade environment that has become materially more volatile: escalating US tariffs, retaliatory measures from major trading partners, a UK-US trade negotiation whose outcome remains uncertain, and a geopolitical realignment that is reshaping supply chain economics in ways that go well beyond tariff schedules.

Understanding the tariff landscape

The UK Global Tariff (UKGT) is the schedule of tariffs that applies to imports into Great Britain from countries with which the UK does not have a free trade agreement. Rates vary significantly by commodity — from zero on many industrial goods to 12% on some footwear, 15–20% on processed food products, and substantially higher on some agricultural goods. Businesses that previously sourced from countries whose goods entered the EU under EU preferential rates and assumed those rates would continue under UKGT have sometimes discovered material differences.

UK-EU trade benefits from the Trade and Cooperation Agreement (TCA), which provides for zero tariffs on goods that meet Rules of Origin requirements. The critical word is "meet." Zero tariffs under the TCA are not automatic — they apply only when goods can be demonstrated to originate in the UK or EU under the agreement's origin rules. For many manufactured goods, this requires that a defined proportion of the product's content or processing occurred in the relevant territory. For businesses assembling or manufacturing with components from third countries — China, USA, Southeast Asia — meeting Rules of Origin can be complex, costly, or impossible, meaning TCA zero rates do not apply and standard UKGT rates do.

The second Trump administration's trade agenda has reintroduced significant tariff pressure on UK exporters to the US market. Broad-based import tariffs, sector-specific duties on steel, aluminium, semiconductors, and automotive products, and the ongoing threat of further escalation have created a substantially less favourable environment for UK businesses selling into the US than existed two years ago.

For UK SMEs sourcing materials or components from the US, retaliatory tariff schedules — whether implemented or threatened — add cost and uncertainty to supply chains that previously operated on stable pricing assumptions. For those selling into the US, the effective margin on US sales has compressed, and in some categories, the US market has become uneconomic for smaller UK exporters who lack the volume to absorb tariff costs in their pricing.

The UK-US trade deal that was under negotiation as of 2026 may eventually provide relief in specific sectors, but the timeline, scope, and political durability of any such agreement remain uncertain. UK SMEs with significant US exposure should plan for the current tariff environment to persist, not assume preferential terms are imminent.

The EU's Carbon Border Adjustment Mechanism — which entered its transitional phase in October 2023 and moves to full implementation in 2026 — applies a carbon price to imports of steel, aluminium, cement, fertilisers, electricity, and hydrogen into the EU. For UK manufacturers in these sectors exporting to the EU, CBAM creates a new cost that effectively mirrors the EU Emissions Trading System price — currently in the range of €60–80 per tonne of CO₂ equivalent — that EU producers pay. The UK is developing its own CBAM, which will apply to imports into the UK of the same categories from countries without equivalent carbon pricing.

The practical implication for supply chain procurement is that embedded carbon is now a cost variable in cross-border trade for an expanding set of material categories. A steel purchaser sourcing from a supplier outside the EU — or a UK manufacturer exporting steel-containing products to the EU — now needs to account for CBAM costs in their landed cost calculations.

The red tape cost — what businesses consistently undercount

Tariffs are the visible cost of international trade. The red tape costs — the administrative burden of customs compliance — are equally real, often larger in aggregate, and much harder to quantify. They show up in management time, in errors and delays, in professional fees, and in the commercial friction that makes some cross-border relationships more trouble than they are worth.

Selling overseas — the export side of the equation

Everything described above applies in reverse when UK SMEs sell into overseas markets. The administrative requirements, tariff costs, and compliance burden fall primarily on the importer in the destination country — but they affect the UK exporter through price competitiveness, customer experience, and the practical difficulty of supporting international customers through a complex import process.

Every UK business exporting goods outside the UK requires an Economic Operator Registration and Identification (EORI) number. Export declarations are required for goods leaving the UK outside of certain low-value thresholds. For certain goods — controlled items, dual-use technologies, some agricultural products, goods destined for sanctioned or controlled destinations — export licences are additionally required from the Export Control Joint Unit (ECJU). Non-compliance is a criminal offence, not just an administrative failure.

Incoterms (International Commercial Terms) define the allocation of cost, risk, and responsibility between buyer and seller in an international transaction. For UK SMEs new to export, the choice of Incoterm has significant practical implications. DDP (Delivered Duty Paid) means the UK exporter handles all costs including destination country import duty — commercially attractive but operationally demanding for smaller businesses without customs expertise in the destination market. EXW (Ex Works) puts the entire logistics and compliance burden on the buyer — simple for the exporter but commercially unattractive to buyers who can source from a competitor offering better terms. Understanding Incoterms before pricing an export contract is non-negotiable.

The UK joined the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP) in 2023, giving UK exporters preferential market access to 11 countries including Japan, Canada, Australia, Mexico, Vietnam, and Malaysia. Bilateral FTAs with the EU, Japan, Australia, New Zealand, Singapore, and others provide preferential tariff rates that can substantially reduce the cost of trading in those markets — but only for businesses that understand how to claim them and can demonstrate that their goods meet the relevant Rules of Origin requirements. Many UK SMEs are leaving preferential tariff access on the table simply because they do not know it exists or do not have the capability to claim it.

What good cross-border procurement looks like

The businesses that manage international procurement and trade most effectively share a set of disciplines that are accessible to SMEs as well as large organisations. They are not about having more resource — they are about using resource more intentionally.

1. Calculate the true landed cost before committing. For every international supply relationship, calculate the full landed cost — including tariff duty, import VAT cash flow impact, broker fees, SPS inspection costs (where applicable), currency risk, and the management time cost of the compliance burden. Compare this honestly against the cost of a domestic or near-shore alternative. International sourcing is often cheaper even after these costs — but the calculation needs to be done, not assumed.
2. Classify your goods correctly — and document it. Invest in getting commodity codes right for all your key import and export items. Use HMRC's Tariff Classification Service or a specialist customs consultant for complex goods. The cost of a classification review is trivial against the cost of a retrospective duty demand covering three years of underpayment.
3. Understand your origin position for every key supply relationship. For goods you import under preferential tariff arrangements, do you have the supplier declarations to support the claim? For goods you export claiming FTA preferences, do they genuinely meet the Rules of Origin? If you do not know the answer, you are carrying compliance risk that could materialise as retrospective duty liability.
4. Build tariff scenarios into supplier contract terms. For multi-year supply contracts with cross-border elements, include provisions that address what happens when tariff rates change materially. A contract that assumed zero tariffs under TCA is potentially exposed if Rules of Origin cannot be demonstrated and duties are applied retrospectively. Force majeure and price renegotiation triggers for material tariff changes are worth including for significant cross-border relationships.
5. Know your FTA entitlements. If you are exporting to any of the 11 CPTPP markets, or to any country with which the UK has a bilateral FTA, ensure you understand the preferential rates available and have the origin documentation to claim them. The UK's network of trade agreements is one of the few post-Brexit trade benefits that is genuinely accessible to SMEs — but only to those who use it.