Customs value: what actually goes in the box

The invoice is the starting point, not the answer

Duty is charged on the customs value, and for most imports that is built up under the transaction value method: the price actually paid or payable for the goods, plus a defined list of things that have to be added, minus a short list that can be taken out.

Getting it wrong is not a rounding error. Understate the value and you have underpaid duty and import VAT, which HMRC can assess later with interest. Overstate it and you have simply paid more tax than you owed on every shipment.

What has to be added

Freight and insurance up to the point of import in the UK. Selling commission — the commission your seller pays their own agent. Royalties and licence fees where paying them is a condition of the sale. Packing costs. And assists.

The test for royalties is whether the seller requires the payment before you can buy the goods. A licence fee you happen to pay to an unrelated party for something else is not automatically dutiable; one the seller insists on as a condition of supply is.

Assists: the one that catches importers out

An assist is anything you supply to the factory free of charge or below cost for use in making your goods — a mould or tool, a die, materials, artwork, designs or engineering work done for the product.

Its value has to be apportioned across the goods produced with it and added to the customs value. So a £6,000 mould used to produce 20,000 units adds 30 pence to the customs value of each one. It is dutiable even though it was invoiced separately, months earlier, and never travelled in the container.

Why the tooling mistake surfaces late

The tooling invoice is usually paid before production, often to a different account, and it never appears on the shipping paperwork. Nothing at the border prompts anyone to declare it, so the goods clear and the omission is invisible.

It becomes visible in an audit, when HMRC compares your purchase ledger against your declarations. By then the shipments have accumulated and so has the interest. Declaring the apportionment from the start costs pennies per unit; discovering it later costs a settlement.

What can be left out

Buying commission — what you pay your own agent for acting on your behalf — is excludable, but only if it is shown separately from the price paid for the goods. Bundled into the unit price, it is part of the price and becomes dutiable.

Also excludable, where shown separately: transport costs after the goods arrive in the UK, and charges for construction, assembly or maintenance carried out after import. The principle is that duty is charged on the imported goods, not on what happens to them afterwards.

There is one more deduction that matters if your supplier quoted you DDP. UK duty and import VAT payable because of the importation can be left out of the customs value, provided they are shown separately. A DDP price has them baked in, so unless you strip them out you declare a value that already contains tax — and then pay duty and VAT on top of it. Ask the supplier to break the DDP price down before you build the value.

Where our model sits

We charge £0 sourcing fees and quote one landed price, so there is no separate buying commission in the arrangement to itemise. If you use a commission-based agent, itemising their buying commission separately from the goods price is worth doing — it is one of the few legitimate reductions available.

Where a project involves tooling, we set out the tooling cost and the production quantity so the apportionment is a calculation you can hand to your customs agent, rather than something nobody thought about.

Currency, and the rate that applies

If the invoice is in dollars or renminbi the value has to be converted for the declaration, and the rate used is the official one published for customs purposes for that period — not the live market rate and not your bank's rate on the day.

It is a small point that becomes a real discrepancy over a year of shipments, and it is the sort of inconsistency that draws attention in an audit.

Keep the workings

Customs valuation records have to be kept for at least four years. That means the tooling invoice and the apportionment calculation, not just the commercial invoice for the goods.

If you cannot show how you arrived at a value, you are arguing from memory against a documented assessment. Keeping the arithmetic is the cheapest insurance in this whole area.