Korea Customs Valuation: What Korean Customs Adds to Your Invoice Before Charging Duty

What is customs value in Korea?

Customs value is the amount Korean customs charges duty on. Duty equals that value multiplied by the tariff rate, so the rate alone never tells you the liability. Article 30(1) of Korea's Customs Act defines it as the transaction value: the price actually paid or payable for goods sold for export to Korea, adjusted by adding six specified amounts.

The phrase "price actually paid or payable" is broader than an invoice total. Article 30(2) defines it as the total sum paid or payable for the goods, expressly including amounts that offset a debt the seller owed the buyer, amounts the buyer pays to settle the seller's debts, and any other indirect payment. Money that moves under a side agreement counts even though it never appears on the commercial invoice.

Why does the invoice price not settle it?

Because customs looks at the total economic value the buyer gives up to get the goods to Korea, not at one document. Amounts that move outside the invoice get added, and amounts sitting inside the invoice that relate to something other than importing the goods get taken out.

One condition governs the additions. They must rest on objective and quantifiable data. Where that data does not exist, customs does not estimate an amount: it drops the transaction value method entirely and moves to Articles 31 through 35 (Article 30(1) proviso). If you supplied a mold free of charge and nobody can evidence its cost, the valuation method itself changes.

What gets added?

Two of these cause most of the disputes, and both originate on the seller's side.

Assists. Because no money changes hands, they are easy to leave out of the declaration. Decree Article 18 lists materials and components incorporated into the goods, tools and molds and dies used in production, goods consumed in the production process, and engineering, development, design, artwork and drawings needed for production. The last category carries an exception worth knowing: work performed in Korea is excluded. Design done by your Korean buyer's own team does not get added back; design done at your plant does. The default apportionment is by production volume against the quantity actually imported, though the declarant may instead load the full amount onto the first shipment (Decree Article 18-2).

Royalties. Paying one does not make it dutiable. Decree Article 19(2) requires both that the royalty relate to the imported goods and that it be paid as a condition of the sale. For trademarks, the test is met where the mark is on the goods, or is applied after minor operations such as dilution, mixing, simple assembly or repacking. A royalty paid to a third-party licensor rather than to you still counts if paying it is a condition of buying the goods. Going the other way, a royalty for computer software carried on media under HS heading 8523 is treated as unrelated to that media (Article 19(4)).

What gets deducted?

Each is allowed only where the amount can be clearly distinguished from the total paid. Selling equipment on a single all-in price that covers supply, installation and commissioning means the installation element cannot be carved out, and the whole figure becomes dutiable. Splitting the contract into a supply price and a service fee changes the tax outcome by itself.

The dividing line for freight is arrival at the Korean port and readiness for unloading (Decree Article 20(5)). Costs before that point go in; inland trucking and storage in Korea after it come out.

How does the Incoterms rule change the number?

The trade term decides how much of the journey is already inside your price, so the same invoice figure produces different customs values under different terms.

If you sell EXW into Korea, your buyer's duty base is materially higher than your invoice, which is worth knowing before you compare landed-cost quotes against a competitor selling CIF. Term-by-term scope is in the Incoterms 2020 comparison, and what CIF covers is in the CIF term page. Once the figure is set, the FOB import duty calculator and CIF import duty calculator run the arithmetic.

Air freight has a narrow relief. Decree Article 20(3) lets specified goods shipped by air be valued as if carried by ordinary means of transport, so an urgent switch to air does not inflate the duty base. The eligible goods are fixed by ministerial rule and the declarant must file supporting evidence with the price declaration (Article 20(6)).

Which exchange rate applies?

The rate is set weekly and published in advance. Article 18 requires foreign-currency prices to be converted at a rate the Commissioner of Korea Customs Service fixes by averaging the base or arbitrated rates of the week preceding the week in which the import declaration falls.

It is neither the spot rate at declaration nor the rate on the day your buyer remits payment. Because it is fixed per week, moving a declaration across a week boundary changes the applied rate.

Where does import VAT sit?

Import VAT in Korea is charged on the customs value plus the customs duty plus individual consumption tax, liquor tax, education tax, special rural development tax and transportation, energy and environment tax (Value-Added Tax Act Article 29(2)). VAT stacks on top of duty, so an addition left out of the customs value costs more than the tariff rate suggests: the assessment pulls the duty and the VAT on that duty with it.

What happens if the transaction value is rejected?

Korea applies the WTO valuation sequence, and the order is binding.

Steps 4 and 5 can be swapped at the declarant's request (Article 33(1) proviso), which matters where domestic resale figures are commercially sensitive.

Article 30(3) lists when the transaction value is set aside: restrictions on the disposition or use of the goods; a sale subject to conditions or considerations whose value cannot be determined; proceeds accruing to the seller that cannot be appropriately adjusted; and a special relationship between buyer and seller that influenced the price. Customs must give written notice of its reasoning and an opportunity to respond before doing so.

A relationship alone is not disqualifying. The statute requires that the relationship influenced the price, and prices set in a manner consistent with normal pricing practice in the industry are carved out (Article 30(3)4 proviso). Separately, if declared value differs markedly from that of identical or similar goods, customs may demand substantiating documents, and failure to produce them, or accounts not prepared under generally accepted accounting principles, moves the case to Articles 31 to 35 (Article 30(4), 30(5)).

Can the price be provisional?

Yes. Where the price is not fixed at declaration, the declarant files a provisional price declaration and reports the final price later, and customs collects or refunds the difference (Article 28).

The benefit is penalty relief: where the declaration and payment were based on a provisional price filing, the additional tax is waived in full when the final figure comes in higher (Article 42-2(1)2), unless the supporting data proves untrue. Declaring a floating price as if it were final and correcting it later is penalized; declaring it provisionally is not.

What if a filed value turns out to be wrong?

Amended returns carry a taper: filing within 6 months after the correction window closes cuts the 10% additional tax by 30%, within 6 to 12 months by 20%, and within 12 to 18 months by 10% (Article 42-2(1)5). The additional tax is 10% of the shortfall (Article 42(1)1) and 60% where the shortfall arose from concealing or disguising the facts underlying the tax base (Article 42(2)).

Where a transfer pricing adjustment on the tax side changes the picture, Article 38-4(1) provides a dedicated route: a claim for reassessment within 3 months of learning of the adjustment, or within 5 years of the first return.

Can this be confirmed in advance?

Article 37(1) allows an advance ruling on the valuation method before the price declaration is filed, covering three things: matters under Article 30, the method to apply where transaction value cannot be used, and the valuation method for goods traded between related parties.

A re-examination can be requested within 30 days of the result (Article 37(3)). Where the declarant then files in line with the ruling and meets the conditions, customs must value the goods that way (Article 37(4)). Related-party rulings carry an annual reporting duty within 6 months of each fiscal year end (Article 37(5), Decree Article 31(8)), and an application may be rejected while a customs audit on valuation is under way (Decree Article 31(6)).

What sellers into Korea should check

1. Map every payment stream, not just the invoice. Side agreements are inside the value.
2. List anything supplied free of charge. Molds, tooling, components, and drawings produced outside Korea are additions; work done in Korea is not.
3. Read the royalty clause for condition-of-sale language. That wording, not the amount, decides dutiability.
4. Price installation and technical support separately in the contract. What cannot be distinguished cannot be deducted.
5. Use a provisional declaration where the price will move. It is the one route to a penalty waiver.
6. Get a ruling before restructuring related-party pricing. Allow a year for that track.

Duty exposure in Korea is decided by the base as much as by the rate. The rate follows from classification, covered in the HS code guide, while the base follows from how the deal is structured. The declaration flow around it is in the Korea import customs clearance guide.

This guide reflects the law in force as of August 2026. The Customs Act and its Decree are amended regularly and valuation outcomes turn on the facts of each transaction, so confirm the current position with a licensed Korean customs broker before filing.