Royalties, tooling and assists — pitfalls when establishing customs value in the UK

The three most common Method 1 (transaction value) pitfalls in UK customs valuation are: (1) royalties and licence fees — you add them when they are a condition of sale and relate to the imported goods; (2) tooling/assists — moulds, dies, components and engineering supplied to the seller free of charge — you add them proportionally to the number of units; (3) commissions — buying commission does not enter the customs value, selling commission does. All three are the most common reason for an HMRC C18 Post-Clearance Demand Note, with a 3-year retrospective reach. Legal basis: UCC art. 71 (Regulation 952/2013), HMRC Notice 252 sections 5–7 and gov.uk/guidance/working-out-the-customs-value-of-your-imported-goods.

This article is a spoke in the "Customs Value" cluster — if you need wider context (the six valuation methods, the Method 1–6 hierarchy, when Method 1 is not applicable), start with the pillar Customs value in the UK — six valuation methods Method 1–6. Related fundamentals: HS code — the rate you multiply by the customs value depends on it, EORI number and Importer of Record UK — who answers to HMRC for the valuation.

Pitfall 1: Royalties and licence fees — when they are a condition of sale

You add a royalty to the customs value if it is a condition of sale of the imported goods and relates to those goods. The test HMRC uses, and the one the EasyClearance Team runs through with every client holding a brand or software licence, is three questions: (1) does the royalty relate to the imported goods? (2) must the buyer pay it as a condition of sale? (3) is it not already included in the invoice price? Three Yes answers means you add it. Basis: UCC art. 71(1)(c), HMRC Notice 252 section 6.

Condition of sale — the decisive criterion

"Condition of sale" is the point at which the seller would not sell the goods to the buyer without the royalty being paid to the brand owner or licensor. The question is not whether the seller pays the royalty themselves — it is whether the royalty is a condition for the transaction to take place at all. The most common pattern we see at EC clients:

• A factory in China produces t-shirts carrying a major fashion brand's logo.
• The UK importer signs a licence agreement with the brand owner (e.g. a Delaware LLC).
• The factory sells the t-shirts to the importer — but only on condition that the importer holds a valid brand licence.
• The importer pays the factory £10/unit and, separately, pays the brand owner an 8% royalty on the UK retail price.

The royalty is a condition of sale (without the licence the factory does not sell) and relates to the imported goods (the logo is embedded in the product). You add it to the customs value. This exact pattern leads to an HMRC audit and a C18 demand in roughly 60% of the cases our agency has seen over the last 18 months.

When a royalty does NOT enter the customs value

A royalty is not added when it relates to the buyer's activity after import rather than to the imported goods themselves. Typical examples (Notice 252 section 6.4):

• Marketing know-how — sales methodology, the right to use a distribution channel, sales-staff training.
• Franchise fee for the business model — payment for using the franchise system, not for the product.
• Royalty for reproduction / distribution in the UK — fee for the right to print marketing materials in the UK (separate from the product).
• Royalty for post-import services — right to use a patent during installation or servicing.

The dividing line: is the royalty value "embedded" in the physical product (production technology, logo, pre-installed software), or in the importer's activity once the goods have arrived? Embedded in the product = add it. Embedded in the activity = do not add.

Software royalties — a separate problem

A special case is royalties for software bundled with hardware (for example a router with pre-installed firmware, a medical device with proprietary software, GPS units with maps). HMRC interprets this in line with Decision 4.1 of the WCO Technical Committee on Customs Valuation — pre-installed software that is an integral part of the device enters the customs value together with the hardware. Software supplied separately (for instance a licence activated with an online key after import) can be excluded, but requires the transaction to be documented separately.

Pitfall 2: Tooling and assists — free goods sent to the seller

Assists are goods and services that the buyer supplies to the seller free of charge or at a discount, so the seller can produce the imported goods — and they must be added to the customs value proportionally to the number of units. This is the single most common compliance error the EasyClearance Team sees, because assists never appear on the commercial invoice. A company ships a die to a factory in China, the factory produces 3,000 units of product from it, the importer receives an invoice only for the product — and nobody thinks the die should have been added. Basis: UCC art. 71(1)(b), HMRC Notice 252 section 7.

Four categories of assists (UCC art. 71(1)(b))

1. Materials, components, parts incorporated into the product — for example the importer ships chips to a producer in Vietnam, who assembles them into the finished devices.
2. Tools, moulds, dies (tooling) — injection moulds, stamps, printing dies, CNC tools. The importer orders the tooling in the UK or Germany, ships it to the factory, the factory uses it to produce the goods.
3. Materials consumed in production — inks, adhesives, solvents, ancillary materials — when they do not become part of the finished product but are needed in the process.
4. Engineering, design, technical drawings, laboratory tests — performed outside the UK and supplied to the producer. Engineering carried out in the UK is excluded from assists (an important distinction, often misread).

How you value an assist

The value of an assist is the price the importer paid for it (or its production cost if produced in-house), plus the cost of transporting the assist to the seller. Not market value — actual cost. If the tooling has been used previously (it is not new), you deduct depreciation in proportion to the expected number of units to be produced from it across its full life.

How you spread the assist across consignments

HMRC accepts two allocation methods (Notice 252 section 7.3):

• Method (a) — full allocation to the first consignment. The whole assist cost is added to the customs value of the first shipment that uses it. Simple, but inflates the duty on the first consignment.
• Method (b) — proportional allocation. You spread the assist value across the expected number of units produced from that assist over its full life. Fairer, but requires documentation.

The method must be consistent — if you choose (b), you apply it for all assists in the entry. Changing methods mid-way needs a written justification in the customs records.

Engineering and design as an assist — the UK vs non-UK trap

UCC art. 71(1)(b)(iv) introduces an important distinction: engineering, design and technical drawings carried out outside the UK enter the customs value as an assist. Engineering done in the UK is excluded. If a UK importer commissions a device design from a firm in Germany for £50,000 and then sends the design to a producer in China, who builds 1,000 units a year from it, the design is an assist (carried out outside the UK). The same design done in London is not an assist. One EC client had £85,000 of exposure on this last year — designs done by the German R&D arm of the group, never reported, because "it's ours".

Pitfall 3: Buying commission vs selling commission

Buying commission (paid to a buying agent) does NOT enter the customs value. Selling commission (paid to a selling agent) DOES. What matters is whose interest the agent serves — and whether the commission is clearly itemised on the invoice or in the agency agreement. Basis: UCC art. 71(1)(a)(i), HMRC Notice 252 section 5.

Buying commission — conditions for exclusion

For HMRC to accept buying commission as an exclusion (more precisely: as not being added to the customs value), four conditions must be met:

1. An agency agreement clearly stating that the agent acts solely in the buyer's interest.
2. The commission is itemised — a separate invoice or a separate line on the seller's invoice, clearly marked "buying commission".
3. The agent has no shareholding in the seller (and vice versa). Economic independence.
4. The agent does not sell the goods in their own name — no margin, only a flat fee or percentage.

If any of these conditions is not met, HMRC re-classifies the commission as selling commission and adds it. The most common error: an "agent" in China who is in fact a trading company — they buy the goods in their own name and resell to the importer with a margin. That is not buying commission — it is a sale through an intermediary, and the entire margin enters the customs value.

Selling commission — always add it

Selling commission is paid to an agent acting on behalf of the seller (for example a regional agent for a European seller, who brokers sales into the UK). It always enters the customs value — no exceptions. Typical case: a seller in Turkey has a UK agent who finds British customers and earns 3% commission. The commission (paid by the seller) goes into the importer's customs value.

Mixed commission — splitting it out

Sometimes an agent acts on behalf of both the buyer and the seller (so-called "dual agency"). HMRC requires the commission to be split — a buying part and a selling part — with a documented allocation key. Typically 50/50, but if the agency agreement allocates duties differently, the key can be different. Without a split, HMRC treats the whole amount as selling commission and adds it.

Additions and exclusions table — a quick checklist

What happens when HMRC catches an error — the C18 demand

If HMRC's post-clearance audit uncovers under-valuation, they issue a C18 Post-Clearance Demand Note — a formal demand for payment. Payment deadline: 30 days from service. Components of a C18:

1. Back-duty — the difference between correct and declared customs value × the duty rate from the HS code.
2. Back import VAT — 20% on the new base (duty + customs value + other VAT-able elements).
3. Interest — Bank of England base rate + 2.5%, calculated from the date of import to the date of C18 payment.
4. Civil penalty — up to 100% of the unpaid duty (typically 30–70% for negligence, 0% with reasonable care + voluntary disclosure).

Retrospective limit: 3 years from the date of entry (extendable to 20 in cases of deliberate behaviour or fraud). In practice we see 2–3 audits a week at clients who failed to report a royalty or assist out of ignorance. A C18 can be challenged — procedure: written review by HMRC (45 days), then appeal to the First-tier Tribunal (Tax).

Voluntary disclosure — how to reduce the penalty

If you spot a valuation error before HMRC opens an audit, file a voluntary disclosure — a written notification of the error to HMRC's National Duty Repayment Centre (or for newer entries, via the C285 procedure, which also covers upward corrections). Penalty relief on voluntary disclosure:

• Unprompted disclosure (no signal from HMRC) — penalty 0–30% instead of the full amount.
• Prompted disclosure (after an HMRC signal, before formal audit) — penalty 15–50%.
• Reasonable care defence + voluntary disclosure — possible 0% penalty.

The EC team prepares voluntary disclosure documentation for clients as a standard package: retrospective exposure calculation, technical justification for the omission (why it was not reported earlier), and a remediation plan (how we change the process going forward). Typical penalty saving vs a full audit: £15,000–£80,000, depending on the size of the exposure.

Checklist — your own audit before HMRC

The practical flow the EasyClearance Team runs with every new client over a 2–3 hour compliance call:

1. Licence agreements — list every royalty agreement your company holds on imported products. For each one, run the three-question condition-of-sale test.
2. Bill of materials and supply chain — identify whether your company supplies anything to the seller free of charge or below market price: components, tooling, designs, tests, dies.
3. Agency agreements — review every agent, intermediary and sourcing partner. Verify the shareholding position (buying commission requires independence) and the quality of the documentation (commission itemisation).
4. Transfer pricing — if you import from a related party, check that the price passes the arm's length test and that the TP study is up to date.
5. Currency rate — make sure you use the monthly HMRC rate from gov.uk/government/publications/hmrc-exchange-rates-for-2026-monthly, not the spot rate or the NBP rate.
6. CDS entries for the last 3 years — list the MRNs of all imports, identify those that may be affected by a valuation error, and estimate the exposure.
7. Decision — voluntary disclosure (if the exposure is real) or status quo with a documented reasonable care justification.

Frequently asked questions — royalties, tooling, assists

Does a royalty paid once a year for the whole distribution go into the customs value of every consignment?

Yes — if the royalty is a condition of sale, you spread it across the consignments it relates to. Typically in proportion to volume or value. The allocation method must be consistent and documented. Basis: HMRC Notice 252 section 6.6.

What if the tooling is shipped from another group company (not the importer)?

It still enters the customs value as an assist — HMRC looks at group economics, not just the importer's legal entity. If a Polish parent ships tooling to China and the UK subsidiary imports the product, the value of the tooling is added to the UK customs value (with appropriate allocation across the units imported into the UK).

Is a royalty paid in another currency converted at the HMRC rate?

Yes. Every amount added to the customs value is converted to GBP at the monthly HMRC rate from the month preceding acceptance of the entry, the same as the invoice price. The rate from the licence agreement (e.g. the EUR/GBP rate on the date of signing) is not relevant for customs purposes.

Do free sampling and testing assists count?

If laboratory tests carried out outside the UK are a condition for the seller to be able to produce the goods (for example CE certification or safety tests required by the importer), they enter the customs value. If the tests are run independently by the importer for their own purposes (e.g. internal QA) once the goods have arrived, they do not.

Is buying commission paid to a UK-based agent also excluded?

Yes — the agent's country of establishment is irrelevant. What counts is the function (buying on behalf of the importer) and the independence. Buying commission paid to a UK agent who buys in China on behalf of a UK importer is excluded from the customs value in exactly the same way as buying commission paid to an agent in Hong Kong.

What if I do not know how many units will be produced from the tooling?

HMRC accepts method (a) — full allocation to the first consignment. It inflates the duty on the first import, but removes the uncertainty. If it later turns out that more units were produced, there is no downward adjustment (you overpaid once, and that's that). The alternative: method (b) with a conservative forecast and a later C285 correction at the end of the tooling's life.

Can I apply for an Advance Valuation Ruling (AVR) on a royalty?

Yes — and it is often worth doing. An AVR is a binding HMRC interpretation for a specific valuation situation: you describe the transaction, the royalty and the conditions of sale; HMRC issues a binding decision within 90–120 days, valid for 3 years. For importers with a repeating transaction pattern (for instance a fashion brand licensee importing the same product four times a year) an AVR provides compliance certainty. Details: gov.uk/guidance/apply-for-an-advance-valuation-ruling.

Need a compliance audit on royalties / tooling / commissions?

The EasyClearance Team reviews licence agreements, supply chain and agency agreements for Method 1 compliance. We identify missing additions before HMRC does, prepare voluntary disclosures with penalty relief, and design procedures for the future. Typical saving vs a full HMRC audit: £15,000–£80,000.

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What's next — related articles

• Customs value in the UK — six valuation methods Method 1–6 (pillar)
• Importer of Record UK — who answers for the valuation
• HS code — how to find and verify it (ISZTAR + HMRC)
• EORI number — how to obtain it in the UK and PL

Disclaimer: This article is informational and does not constitute legal, tax or binding HMRC advice. Whether a royalty, assist or commission qualifies as part of the customs value depends on the specific terms of the contract — verify the valuation against the gov.uk guidance and HMRC Notice 252 before lodging the entry. For a binding interpretation, apply for an Advance Valuation Ruling.