How do US Tariffs affect international shipping costs?

If you've shipped goods internationally in 2026, you've almost certainly asked it: "Why has my shipping cost jumped, and is it the tariffs?" It's the most-searched question in global freight right now, and the answer is more nuanced than most people realise.

Tariffs don't directly raise the price of a shipping label, but they dramatically increase the total cost of getting goods into a country. In 2026, the US trade policy landscape has been among the most volatile in decades, reshaping supply chains, upending customs strategies, and sending landed costs soaring for importers worldwide.

This guide cuts through the complexity: what tariffs actually are, how they interact with freight rates, what's changed in 2026, and how smart businesses are protecting their margins.

What is a tariff, and how does it differ from a shipping charge? And how do tariffs affect shipping costs?

A tariff (also called a customs duty) is a tax imposed by a government on goods imported into a country. It is paid to customs authorities, not to your carrier or freight forwarder. Your courier bill covers transportation; the tariff is a separate, often much larger, obligation.

The confusion arises because both costs land at the same time: when goods clear customs, the full bill arrives together. Many shippers, especially smaller e-commerce businesses, discover tariff charges only after delivery, when an unexpected invoice appears days later.

💡 How tariffs are calculated (how do tariffs affect shipping costs?

Most tariffs use the CIF value as the base: Cost of Goods + Insurance + Freight. This means your shipping cost is actually included in the value on which the duty percentage is applied — so higher freight rates can nudge your tariff obligation upward too.

The three factors that determine your tariff rate

The rate you pay depends on three variables working together:

• Product classification (HS code) — every product has a Harmonised Tariff Schedule code that determines the base rate

• Country of origin — where the goods were made, not where they shipped from

• Trade relationship — whether a free trade agreement, most-favoured-nation status, or punitive tariff applies between origin and destination

  
  

The 2026 tariff landscape: what has changed

The past 18 months have brought more US trade policy change than the previous decade combined. Here are the developments reshaping freight costs in 2026:

IEEPA tariffs: imposed, challenged, and partially struck down

Early 2026 saw enormous uncertainty around tariffs imposed under the International Emergency Economic Powers Act. The US Supreme Court ruled in February 2026 that IEEPA tariffs were unlawful, with US Customs and Border Protection ceasing collection for goods entering after 24 February 2026. Refund processes through carriers like FedEx and UPS are now underway, but the situation illustrated just how rapidly the compliance landscape can shift.

⚠ Still in force

The IEEPA ruling did not affect other tariffs. Section 301 tariffs on Chinese goods (which can reach 25–145% on specific product categories), Section 232 steel and aluminium duties, and standard Most Favoured Nation duties remain fully in effect.

The end of the de minimis exemption

For e-commerce businesses, this has been the single most disruptive change. From August 2025, the US suspended the de minimis rule, the long-standing exemption that allowed shipments valued under $800 to enter the US duty-free with minimal paperwork. Every US import, regardless of value or mode of entry, is now subject to applicable duties.

Businesses that built entire supply chains around the de minimis model, shipping small parcels directly from Chinese factories to US consumers, have had to fundamentally restructure their operations. Many are now consolidating into formal ocean or air freight entries, warehousing goods in the US, and fulfilling domestically.

145% Peak Section 301 tariff rate on some Chinese goods

£800 De minimis threshold, suspended in the US from Aug 2025

18.5% Estimated average US tariff cost base in 2026

−23% Ocean freight rate drop across all routes in Q4 2025

Falling freight rates vs. rising tariffs: the hidden squeeze

Here is the counterintuitive reality of 2026: ocean freight rates have been falling, but the total cost of importing has been rising. These two facts are not contradictory.

Global fleet capacity has expanded significantly, with an estimated 3.7% increase in container capacity in 2026 alone. This oversupply puts downward pressure on the base shipping rate. But falling freight rates do not reduce tariff obligations. On certain Chinese-origin goods subject to 25–145% additional duties, a saving of £1,000–£1,500 per container on the freight rate is negligible compared to the tariff bill on the cargo value.

"A shipment that looks profitable based on freight alone can quickly lose margin once customs costs are finalised."

This is why leading importers have shifted to landed-cost-first decision-making, calculating the full delivered cost (product + freight + duties + brokerage + storage) before placing orders, rather than treating freight and customs as separate afterthoughts.

Cost component	Who pays it to	Typical range
Ocean / air freight	Your carrier or forwarder	Varies widely by route and mode
Customs duty (tariff)	Government customs authority	0–145% of CIF value depending on product and origin
Customs brokerage fees	Your customs broker	£80–£400+ per entry
Port handling & terminal fees	Port / terminal operators	£100–£400 per container
Fuel surcharges (BAF)	Your carrier	Appended to base freight rate
Demurrage & detention	Carrier / port	£50–£200+ per day if delayed

How tariffs affect different parts of your supply chain

Sourcing and supplier choices

Trade policy has made country of origin the most strategically important variable in procurement. Many businesses are actively relocating sourcing to countries less exposed to US tariffs: Vietnam, India, Bangladesh and Morocco for textiles; Mexico and Eastern Europe for electronics and automotive components. While this diversification requires upfront investment in supplier qualification, the medium-term savings on both freight and duties can be substantial.

Inventory and cash flow

The tariff uncertainty of 2025 drove widespread "front-loading," importing heavily before new measures took effect. This strategy has limits: it ties up capital in stock, generates warehousing costs, and risks product obsolescence. In 2026, the more sustainable approach is selective front-loading of high-turnover, high-margin lines only, coordinated with careful cash-flow planning.

Customs compliance

US Customs and Border Protection has significantly strengthened enforcement, now using pattern-based, data-driven analysis to flag suspicious shipment patterns, including shipment splitting designed to stay below value thresholds. Importers who previously operated informally are finding themselves subject to audits, holds, and retroactive duty assessments.

⛔ Compliance risk is real

Repeated low-value shipments, high-frequency imports from the same sellers, and foreign suppliers shipping directly to end customers are all flagged under current CBP enforcement. Getting compliance right from the outset is considerably cheaper than remedying it after an audit.

What about UK and European shippers?

While the focus has been on US tariff policy, UK and European businesses importing goods are affected in two ways. First, goods you source from the US or from US-tariffed origins may now cost more if your suppliers have passed on increased costs. Second, the EU and UK have their own retaliatory tariff considerations in play, and post-Brexit UK customs rules add a further layer of compliance complexity for British importers and exporters trading with both the EU and the US.

For UK businesses in particular, understanding the interplay between UK Global Tariff rates, UK trade agreements (with countries like Japan, Australia and Canada), and evolving US trade policy is now a core logistics competency, not a specialist legal matter.

Practical steps to protect your margins in 2026

• Calculate landed cost before ordering — use a freight calculator that includes duties, brokerage and handling, not just the transport rate

• Verify your HS codes — misclassification is one of the most common (and costly) compliance errors; incorrect codes can mean you overpay or face penalties

• Review your incoterms — DDP (Delivered Duty Paid) protects buyers from surprise duty bills; DAP/DDU can cause customer service problems and chargebacks

• Diversify your supplier base — reducing dependence on a single origin country gives you flexibility when trade policy shifts

• Work with a licensed customs broker — the complexity of 2026 tariff rules makes professional guidance worth the cost

• Monitor contract vs. spot rates — with overcapacity favouring shippers on ocean lanes, now is a good time to renegotiate freight contracts

• Stay informed on policy changes — tariff policy has changed multiple times in 2025–26; subscribe to industry sources and your forwarder's updates

  
  

✓ The bottom line

Businesses that treat freight, customs and trade policy as one integrated cost decision — rather than separate departmental concerns — are consistently outperforming those that don't. The 2026 freight market rewards planning and agility above all else.

Frequently asked questions

Do tariffs make shipping more expensive?

Not the base freight rate itself — that is set by supply and demand in the carrier market. But tariffs dramatically increase the total cost of delivery, which is what ultimately matters to your bottom line. In 2026, ocean freight rates have actually fallen due to oversupply, but total landed costs for many importers have risen due to duty increases.

Who pays the tariff — buyer or seller?

This depends on the agreed Incoterms. Under DDP, the seller (exporter) pays all duties and delivers cleared. Under DAP or DDU, the buyer (importer) is responsible for duties at destination. For consumer e-commerce, DDP is strongly recommended to avoid delivery failures and chargebacks.

Is the de minimis exemption gone for good?

In the US, the under-$800 duty-free threshold has been suspended as of August 2025. Whether it returns, and in what form, depends on future trade policy decisions. Businesses that relied on it should plan on the assumption it remains suspended.

Can I get a refund on IEEPA tariffs paid?

Yes, a refund process has been established through CBP following the Supreme Court ruling. If your carrier acted as customs broker on those entries, contact them directly as they are working through the refund process with CBP on customers' behalf.

Recommended external links: UK Global Tariff (gov.uk), US CBP tariff guidance, HMRC import guidance, WTO trade statistics.