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Incoterms and Customs Value: Where Businesses Get It Wrong

Written by: Shaun Hall | 14/07/2026 | Read time: 5 minutes
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Incoterms and their impact on customs valuation

Incoterms are often agreed commercially and then passed downstream into logistics and customs processes. That creates a problem when the people using the Incoterm for customs purposes do not fully understand what costs are included in the price.

The customs value is used to calculate duty and import VAT. If the valuation basis is wrong, the business may overpay or underpay. Incoterms play a key role because they indicate where responsibility for transport, insurance and risk transfers between buyer and seller. They do not, by themselves, determine the customs value, but they strongly influence what needs to be checked.

Freight, inconsistencies and process risk

  • FOB and CIF provide a useful example. Under FOB terms, the invoice price will typically exclude the main international freight and insurance. Those costs may need to be added for customs valuation purposes. Under CIF terms, those costs are usually included. If the same freight is added again, the business may overvalue the goods and overpay duty.
  • The issue becomes more difficult where Incoterms are used inconsistently across suppliers or where invoices do not separate freight clearly. In those cases, declarations may be based on assumptions rather than evidence. Over time, those assumptions can become embedded in the process and repeated across multiple shipments.
  • There is also a difference between commercial understanding and customs application. A sales team may agree DAP or CIP because it suits the commercial arrangement, while the customs team needs to understand whether the declared value reflects the correct customs basis. Without a clear internal process, the business may rely on brokers to interpret incomplete information.

A practical solution is to map each Incoterm used by the business to its customs valuation treatment. That does not mean creating a rigid rule that ignores the facts of each transaction. It means setting a consistent framework so that freight, insurance and adjustments are considered properly.

Where businesses operate across multiple suppliers, routes and entities, this mapping becomes even more important. It gives finance, logistics and customs teams a shared reference point and reduces the risk of inconsistent declarations.

Incoterms should not be treated as a minor contract detail. They are a key input into customs value and should be controlled accordingly.

If you are concerned about valuation risk, Frontiera can support with an Incoterms and customs valuation review.

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