Every time you import goods into the UK, HMRC charges duty based on the customs value. Getting this number wrong means you either overpay duty or risk a compliance penalty. Yet many importers do not realise which costs belong in the calculation.

The transaction value method is the most commonly used customs valuation method for UK imports. It starts with the price you paid the seller. After that, you adjust it by adding or excluding specific costs as UK law requires.

This article explains what UK customs value includes, what it excludes, and where importers commonly make mistakes.

What UK Customs Value Actually Means

Customs value is the figure HMRC uses to calculate the import duty on your goods. It differs from the commercial invoice value. HMRC bases the rules on the WTO Customs Valuation Agreement, brought into UK law through the Taxation (Cross-border Trade) Act 2018 and CIDEER regulations.

Method 1, the transaction value method, serves as the starting point for nearly all imports. It relies on the price paid or payable for the goods when sold for import to the UK, adjusted with specific additions and deductions. If Method 1 does not apply, you move sequentially through Methods 2 to 6.

Your customs value directly affects your duty bill. Multiply it by the commodity code duty rate and you get the amount payable. An incorrect customs value therefore means an incorrect duty payment.

Six Costs You Must Add to the Price Paid

HMRC requires you to add certain costs to the invoice price if they do not already appear there. These additions create a comparable declared value for every importer regardless of their trading arrangements, as set out in the official Method 1 guidance.

Delivery costs to the UK border. All transport, loading, and handling costs up to the place of introduction into the UK count as part of the customs value. For sea freight, you include costs up to the UK port of entry. For air freight, you include costs up to the first UK airport. Suppliers invoicing on CIF terms already cover these costs, so no further transport addition is needed.

Insurance during transit. Any insurance premium covering the goods during transport to the UK must go into the customs value. Global or blanket policies need apportioning to the individual consignment. Insurance costs after arrival in the UK can stay out of the calculation.

Selling commission and brokerage. Commission you pay to an agent involved in the sale belongs in the customs value. Buying commission, shown separately on the invoice, can remain outside it.

Packing and container costs. Packing materials and labour must feature in the customs value if they are not already in the price. For reusable containers, you can spread their cost across the expected number of imports.

Royalties and licence fees. A royalty or licence fee you pay to the seller as a condition of the sale must form part of the customs value. This often applies to branded goods, patented products, or goods manufactured under licence.

Assists. These cover goods or services you provide free or at reduced cost to the foreign manufacturer. Tooling, moulds, materials, designs, and engineering work done outside the UK all count as assists. Their value needs adding to the customs value.

What You Can Exclude From the Customs Value

HMRC also permits specific exclusions when these costs appear in the invoice price. You can deduct UK transport costs after the goods reach the border, UK duties and taxes, and interest charges shown separately.

Post-import construction, assembly, and maintenance charges also fall outside the customs value. The same applies to buying commission, marketing costs, and advertising expenses when clearly identifiable. Early payment discounts that appear on the invoice reduce the customs value, provided you actually meet the discount terms.

Five Practical Tips for Getting Customs Value Right

Check your Incoterms before declaring. FOB invoices need freight and insurance added. CIF invoices already include these costs. Starting from the wrong point causes incorrect declarations.

Ask your freight forwarder for a cost breakdown. Bundled charges make apportionment difficult. Request a split showing pre-UK and post-UK costs separately so you can declare correctly.

Review inter-company pricing carefully. Importing from a related overseas company draws HMRC scrutiny on whether the relationship affects the price. A transfer pricing study may assist, but HMRC is not obliged to accept it as customs value evidence.

Track tooling and assists across all shipments. Moulds or designs you provide to an overseas supplier need their cost spread across the expected import volume. Declare this figure consistently on each entry.

Retain evidence for every cost element. HMRC may ask you to justify your declared value during a post-clearance audit. Keep freight invoices, insurance certificates, royalty agreements, and supplier contracts ready.

When Method 1 Does Not Apply

Some situations block the use of the transaction value method. A sale subject to conditions that affect the price in unmeasurable ways rules out Method 1. Goods imported on consignment without an actual sale also sit outside it. Related-party transactions where the relationship has influenced the price require you to try Method 2 instead.

When Method 1 fails, you must work through the remaining methods in order. Method 2 uses the transaction value of identical goods imported around the same time. Method 3 turns to similar goods if identical goods data does not exist. Method 4 works backwards from the UK resale price. Method 5 calculates value based on production cost plus profit. Method 6, the fall-back method, applies reasonable adjustments using one of the earlier approaches flexibly.

How NKR Freight Helps with Customs Value

NKR Freight prepares customs declarations for importers through the CDS platform. Our in-house customs team checks your commercial invoice, freight costs, and Incoterms so the declared customs value meets HMRC requirements.

Regular importers who want a second opinion on their customs value calculations can ask our specialists to review their current declarations. We also handle SDP and EIDR entries where the supplementary declaration needs a complete customs valuation.

Frequently Asked Questions

Is customs value the same as the commercial invoice value?

Not always. The invoice value serves as the starting point under Method 1, but you must add delivery costs, insurance, and other charges that do not already appear in the price.

Do I include UK freight costs in the customs value?

No. Transport costs after the goods reach the UK border stay out of the customs value. Only freight up to the UK port or airport of entry must feature in the calculation.

What happens if I declare the wrong customs value?

HMRC can issue a demand for underpaid duty plus interest. Civil penalties may apply in cases of non-compliance. Overpaying means you lose money unnecessarily.

Can I get a binding decision on customs value from HMRC?

Yes. HMRC offers Advance Valuation Rulings. These provide legally binding decisions on the correct valuation method for your goods before you import.

Conclusion

UK customs value determines how much duty you pay on every import. Method 1, the transaction value method, applies to most shipments. Begin with the price paid to the seller and add delivery costs, insurance, packing, commission, royalties, and assists when they are not already included. You can exclude costs after the UK border such as domestic transport and post-import services.

Accurate customs value protects you from underpayment penalties and prevents unnecessary overpayments. Review your Incoterms, keep cost evidence, and check inter-company pricing carefully.

NKR Freight files accurate customs declarations with correct customs values for importers across the UK. Our team can help you declare the right value on every entry.

Contact NKR Freight today to discuss your customs valuation needs. Learn more about our customs clearance services.