How Is Customs Value Actually Calculated?

Many businesses assume that the "Customs Value" is simply the price written on the commercial invoice. However, customs authorities require the Landed Cost or Transaction Value, a figure that often includes "hidden" costs not listed on the invoice.

Getting this wrong carries two major risks: Under-valuation leads to severe penalties and audits, while over-valuation means you are voluntarily paying taxes you don't owe. We help you determine the correct value to ensure compliance and cost efficiency.

Method 1: Transaction Value

It Starts with "Method 1".

For the vast majority of imports, customs value is based on the Transaction Value. This is the price actually paid or payable for the goods when sold for export to the country of importation.

However, "Price Paid" is not enough. To reach the correct Customs Value, you must make specific Additions and Deductions.

Dutiable

Common Additions

You must add these costs to your value if they are not already included in the price:

Assists

Materials, tools, dies, or moulds provided by the buyer to the seller free of charge or at a reduced cost.

Royalties & Licence Fees

Payments related to the goods that the buyer is required to pay as a condition of sale.

Packing & Commissions

Selling commissions and the cost of packing (labour and materials).

Freight & Insurance

Depending on the country e.g., the UK/EU use CIF value, meaning you must add freight and insurance costs to the goods' value.

Non-Dutiable

Common Deductions

You can deduct these costs if they are clearly distinguished on the invoice:

Post-importation charges

Construction, assembly, or maintenance costs incurred after the goods arrive.

Buying Commissions

Fees paid to an agent who represents you (the buyer) in the purchase.

Inland Transport

Transport costs within the destination country (after the border).

Methods 2-6

What If There Is No "Sale"?

If you are transferring stock between your own branches (inter-company transfers), importing samples, or leasing equipment, there is no "sale." Therefore, you cannot use Method 1.

We assist businesses in applying the correct alternative hierarchy mandated by the WTO. You must proceed through these methods in order, you cannot skip to a preferred option.

Method 2
Transaction Value of Identical Goods

Using the price of identical goods sold to the same country.

Method 3
Transaction Value of Similar Goods

Goods that are "like" the import in component and function.

Method 4
Deductive Method

Working backwards from the final sales price in the importing country.

Method 5
Computed Method

Calculating the cost of production + profit + general expenses.

Method 6
The Fall-back Method

A reasonable estimation based on the above methods.

Assists

Be Weary of Hidden Compliance Traps

One of the most common reasons for customs penalties is the failure to declare Assists.

Customs Value Explained

Calculating the correct customs value

A UK car manufacturer provides a £50,000 mould tool free of charge to a supplier in China to produce plastic bumpers.

Invoice

The Chinese supplier invoices the manufacturer £10 per bumper (the cost of plastic + labour).

Error

The manufacturer declares the customs value as £10.

Free mould tool supplied

The buyer supplies a £50,000 mould free of charge, called an “assist.”

Value of assist £50,000

Supplier invoice

The £10 invoice price per bumper excludes the mould’s value.

Invoice price £10 per bumper

Apportion the assist

Divide £50,000 by the imported quantity to get the assist per bumper.

Assist per bumper £50,000 ÷ imported quantity

Correct customs value

Add the assist cost to the £10 price to get the customs value per bumper.

Correct customs value Invoice price + Assist per bumper

Customs value per bumper = £10 invoice price per bumper + (£50,000 ÷ imported quantity)

Get an expert to check your process, book a free consultation.

Glossary

Useful Definitions

Incoterms: International commercial terms (e.g., EXW, FOB, CIF) that define where risk and cost transfer. These determine how much freight/insurance must be added to the customs value.

Assist: Any good or service (engineering, moulds, tools) provided by the buyer to the seller for free or at a reduced cost for use in the production of imported goods.

CIF (Cost, Insurance, and Freight): A valuation basis where the duty is calculated on the cost of goods plus insurance and freight to the border.

Transfer Pricing: The price at which related parties (e.g., two branches of the same company) transact. Customs checks this closely to ensure the price hasn't been artificially lowered to reduce duty.

Related Resources
Duty Reliefs & Special Procedures

Once you have calculated the correct value, you can determine if you are eligible to suspend the duty entirely

Trade Management & Compliance Strategy

Valuation is just one pillar of a robust trade strategy.