Customs Value Declaration Methods: How to Declare Import Value Correctly

What Is Customs Value and Why Do Declaration Methods Matter?

Customs value is the monetary value assigned to imported goods for the purpose of calculating customs duties and import taxes. Understanding the correct customs value declaration methods is critical because the value you declare directly determines how much duty and tax you pay. It is not simply the price on your invoice — it is a carefully defined figure that includes certain costs and excludes others, based on international rules set by the World Trade Organisation (WTO).

Getting your customs value right is critical because:

• Customs duty is calculated as a percentage of the customs value. A 10% duty on a $12,000 customs value costs you $1,200. If the value should have been $15,000, you have underpaid by $300. See our import duty rates guide for current rates by product category.
• Import taxes are calculated on the customs value plus duty. In the UK, import VAT is 20% of (customs value + duty + any excise duty). In the US, there is no federal import VAT, but Merchandise Processing Fees and Harbor Maintenance Fees apply. In Australia, 10% GST applies.
• Under-declaration is fraud and can result in penalties, seizure of goods, and criminal prosecution.
• Over-declaration means you are paying more duty and tax than necessary.

The 6 WTO Customs Value Declaration Methods

The WTO Agreement on Customs Valuation establishes six methods for determining the customs value of imported goods. These methods must be applied in strict order — you can only move to the next method if the previous one cannot be used.

Method 1: Transaction Value

This is the primary method, used in over 90% of imports worldwide.

The transaction value is the price actually paid or payable for the goods when sold for export to the country of importation, adjusted for certain additions and deductions.

In simple terms: it is what you actually paid your supplier, plus certain costs. This method is used universally under the WTO Customs Valuation Agreement, which has been adopted by virtually all trading nations.

When it applies: Whenever there is a genuine sale between buyer and seller at arm's length (i.e., the buyer and seller are not related, or if related, the relationship did not influence the price).

When it does not apply:

• The goods are not the subject of a sale (e.g., free samples, gifts, goods on consignment)
• The sale is between related parties and the relationship influenced the price
• There are restrictions on the buyer's use or disposal of the goods (other than legal requirements)
• The sale is subject to conditions for which a value cannot be determined

Method 2: Transaction Value of Identical Goods

If Method 1 cannot be used, customs looks at the transaction value of identical goods — goods that are the same in all respects, including physical characteristics, quality, and reputation.

The identical goods must have been:

• Exported to the same country at or about the same time
• Sold at the same commercial level (wholesale vs retail) and in similar quantities

Method 3: Transaction Value of Similar Goods

If no identical goods transaction exists, customs uses the transaction value of similar goods — goods that are not alike in all respects but have similar characteristics, materials, and function.

Like Method 2, the similar goods must have been exported at about the same time, at the same commercial level, and in comparable quantities.

Method 4: Deductive Method

This method works backwards from the selling price in the importing country. Customs takes the price at which the goods (or identical/similar goods) are sold domestically and deducts:

• Commissions or profit margins normally added in the importing country
• Transport and insurance costs within the importing country
• Customs duties and taxes paid on importation

Method 5: Computed Method

The computed method builds up the customs value from the cost of production:

• Cost of materials and manufacturing
• Profit and general expenses of producers in the exporting country
• Cost of transport and insurance to the importing country

This method is rarely used because it requires access to the producer's cost data, which foreign manufacturers are usually unwilling to share.

Method 6: Fallback Method

If none of the above methods can be applied, customs uses the fallback method — a reasonable means of valuation based on the principles of the previous methods, applied flexibly. The value must not be based on:

• The selling price of domestically produced goods
• A system of minimum customs values
• Arbitrary or fictitious values

Method 1 in Detail: What Is Included and Excluded

Since Method 1 is used for the vast majority of imports, understanding exactly what is included in the transaction value is essential.

Costs That Must Be Added to the Invoice Price

Even if they are not on the commercial invoice, the following costs must be included in the customs value:

1. Freight to the UK border

All transport costs for getting the goods to the port of entry (or airport) in the importing country. If your Incoterm is FOB, you must add the ocean freight and any origin charges not covered by the supplier. If your Incoterm is EXW, you must add inland transport to the port, export handling, and international freight. Note: the US uses FOB (transaction value) as the basis for customs valuation, so freight and insurance to the US port are generally excluded from the dutiable value.

2. Insurance

The cost of insuring the goods during international transport. If you have not purchased insurance, customs may require you to include a notional insurance cost (typically 0.5% of the CIF value).

3. Royalties and licence fees

If you are paying royalties or licence fees to use a brand, patent, or design on the imported goods, and these payments are a condition of the sale, they must be added to the customs value.

4. Assists

"Assists" are goods or services provided by the buyer to the supplier free of charge or at reduced cost for use in producing the imported goods. Examples include:

• Moulds, dies, or tooling provided to the factory
• Design and engineering work done in the importing country and provided to the manufacturer
• Materials or components supplied to the producer

The value of assists must be apportioned across the goods they were used to produce and added to the customs value.

5. Proceeds of subsequent resale

If any part of the revenue from reselling the goods accrues to the supplier (e.g., profit-sharing arrangements), that amount must be added.

6. Buying commissions are excluded, but selling commissions are included

If you use a buying agent who acts on your behalf to source goods, their commission is not added to the customs value. However, if the agent acts on behalf of the seller, their commission is added.

Costs That Are Excluded from Customs Value

The following costs should not be included, provided they are separately identified from the price paid:

• Post-importation transport — delivery costs from the port of entry to your warehouse
• Post-importation assembly or installation — costs incurred after the goods clear customs
• Customs duties and taxes — these are calculated on the customs value, not included in it
• Buying commissions — fees paid to your own sourcing agent
• Interest charges — financing costs under a credit arrangement, if separately shown
• Right to reproduce — charges for the right to reproduce goods in the importing country (distinct from royalties on the imported goods themselves)

Practical Examples

Example 1: Standard FOB Purchase

You buy 2,000 phone cases from a Chinese supplier at $4.50 per unit FOB Shenzhen.

The customs value is the CIF equivalent: goods + freight + insurance. Duty is calculated on this figure, converted to local currency at the official exchange rate if needed (e.g., HMRC monthly rates in the UK, CBP rates in the US).

Example 2: EXW Purchase with Assists

You buy furniture from a Vietnamese manufacturer at $20.00 per unit EXW factory. You ordered 500 units. You also provided custom moulds worth $3,000 that the factory used to produce the items.

The moulds are a one-off cost, but they must be added to the customs value. If the moulds will be used for future orders (say, 5,000 units total), you can apportion the $3,000 across all 5,000 units rather than loading it entirely onto this shipment. Discuss apportionment with your customs broker.

Example 3: CIF Purchase with Royalties

You import branded accessories under licence. The CIF price is $19.00 per unit for 1,000 units. You also pay a royalty of 5% of your domestic selling price ($32.00) to the brand owner as a condition of the sale.

The royalty is added because it is a condition of the sale — you cannot buy the goods without agreeing to pay the royalty.

What Happens If Customs Authorities Challenge Your Value Declaration

Customs authorities worldwide have extensive data on typical import values for thousands of product categories. If your declared value appears unusually low (or high), they may:

1. Request additional documentation — purchase orders, payment receipts, bank statements showing the actual transfer amount, supplier price lists, or proof of the relationship between buyer and seller.

2. Issue a post-clearance demand — if customs believes the value was under-declared, they can issue a demand for additional duty and taxes (e.g., C18 in the UK, CF29 in the US), potentially going back several years.

3. Detain the goods — customs can hold your shipment pending a valuation review, which can take days or weeks. You will incur storage charges during this time.

4. Apply a higher valuation — if you cannot prove the declared value, customs may apply their own valuation using Methods 2-6.

How to Protect Yourself

• Keep all commercial documentation — contracts, purchase orders, payment records, email negotiations. You need to prove that the declared value is genuine.
• Ensure consistency — your invoice value, payment records, and declared customs value should all match. Discrepancies are a red flag.
• Declare accurately — if your supplier gives you a discount, you can declare the discounted price, but be prepared to explain and evidence the discount.
• Use a reputable customs broker — they will advise on valuation issues and help you avoid common mistakes.

The Relationship Between Customs Value, Duty, and Import Taxes

Here is how the numbers flow:

1. Customs value (CIF or adjusted transaction value — FOB-based in the US)
2. Customs duty = Customs value x duty rate (based on HS code)
3. Import taxes = varies by country (e.g., 20% VAT in the UK, 10% GST in Australia, Merchandise Processing Fee in the US)

Example (UK import):

• Customs value: $12,500
• Duty rate: 6.5%
• Duty: $812.50
• Import VAT: ($12,500 + $812.50) x 20% = $2,662.50
• Total payable at border: $3,475

Use the Import Calculator to estimate your landed cost including duty and import taxes, and the Duty & Tax tool to look up duty rates for your specific commodity code.

Quick Reference: Customs Value Declaration Methods Summary

Key Takeaways

1. Customs value is not just the invoice price — it includes freight, insurance, royalties, and assists where applicable.
2. Method 1 (transaction value) applies in 90%+ of cases — know what is included and excluded.
3. Always declare the true value — under-declaration is fraud with serious consequences.
4. The Incoterm determines your starting point — FOB requires adding freight and insurance; CIF is approximately the customs value already.
5. Keep comprehensive records — customs authorities can audit you years after importation (6 years in the UK, 5 years in the US and EU).
6. Assists are often overlooked — if you supply moulds, tooling, or designs to your manufacturer, their value must be included in customs value.

Getting your customs valuation right from the start saves money, avoids delays, and keeps you on the right side of customs authorities. Check the current import duty rates for your product category, then use the Import Calculator to model your total landed cost based on your declared customs value. When in doubt, consult your customs broker — it is far cheaper than a post-clearance demand.