No. Declaring a lower value than the actual price paid for imported goods is a criminal false declaration under Japan's Customs Act (関税法), not a gray area or a negotiable discount. The dutiable value Japan Customs requires is the real transaction price, and separating out part of that price onto a second invoice or side payment does not change what the law treats as the declared value.
Why Isn't a "Discounted" Invoice Just Good Negotiating?
Because Japan Customs values imported goods on the actual price paid or payable for them, not on whatever figure appears on the commercial invoice presented at the border. Customs Tariff Act (関税定率法) Article 4 sets the dutiable value as the real transaction price on a CIF basis: cost, insurance, and freight to Japan. A supplier that issues a lower invoice while collecting the balance separately, through a second wire, a side agreement, or a "consulting fee" routed outside the shipment paperwork, has not created a lower customs value. It has created a gap between the declared value and the real one, and that gap is exactly what a false declaration is.
What Actually Happens If Japan Customs Catches It?
A confirmed false declaration exposes the importer to criminal liability under Customs Act (関税法) Article 111: up to three years in prison or a fine of up to 3,000,000 yen, where the declared value does not reflect the actual transaction price. This is not a civil penalty schedule with a fixed fee; it is a criminal statute, and the importer of record is the party who signed the declaration.
Japan Customs does not need to catch the discrepancy at the border to act on it. The far more common route is a post-clearance audit (事後調査) conducted months or years after the goods have already cleared, where an auditor cross-checks declared values against the importer's own accounting records, bank remittance history, and supplier contracts. Our post-clearance audit guide covers how that process actually runs and what documentation an importer needs on hand before an auditor asks for it.
Does the Same Rule Apply to Hidden Costs, Not Just a Fake Discount?
Yes, and this is the pattern Japan Customs has documented catching repeatedly in practice: a buyer pays trademark or licence royalties to a brand owner as a condition of being allowed to import and sell branded goods, then declares only the separate goods-purchase invoice as the customs value, leaving the royalty payment off the declaration entirely. Where the royalty is genuinely a condition of the sale and relates to the imported goods, it is includable in the dutiable value under Customs Tariff Act Article 4, and excluding it produces the same false-declaration exposure as an outright discounted invoice. The mechanism is different from a side-payment scheme, but the legal result is identical: the declared value is lower than the real transaction value, and Customs treats both as the same offense.
Is This Actually Enforced, or Just a Theoretical Risk?
It is actively enforced, and the enforcement trend has been rising. Japan's Ministry of Finance reported 300 customs-related criminal case dispositions in its most recent annual enforcement year, a 91 percent increase over the prior year, with the total evaded amount reaching approximately 700 million yen, up 79 percent. The largest single category by far was gold bullion smuggling, not commercial under-invoicing, so the figures are not a direct measure of under-invoicing enforcement specifically. What they show is that Japan Customs' criminal investigation activity is expanding sharply across import-side revenue offenses generally, and an importer weighing whether a "creative" invoicing structure is worth the risk is weighing it against an enforcement environment that is getting more active, not less.
Key points:
(a) Dutiable value under Customs Tariff Act Article 4 is the actual transaction price, and splitting that price across multiple invoices or payment channels does not lower it in the eyes of Japan Customs.
(b) A confirmed false declaration is a criminal matter under Customs Act Article 111, carrying up to three years imprisonment or a 3,000,000 yen fine, not a civil fee schedule.
(c) Discovery most often comes from a post-clearance audit months or years after clearance, through bank and accounting records, not from a border inspection at the time of import.
(d) Excluding a royalty or licence fee that is a condition of the sale from the declared value carries the same legal exposure as an outright discounted invoice.
Structuring an IOR or ACP Arrangement That Doesn't Create This Exposure
Aplash's IOR service takes title to the goods and declares the actual price it pays the overseas supplier as the customs value, so there is no separate side arrangement for a customs auditor to later find inconsistent with the paperwork. Because the IOR is the buyer of record in a genuine transaction, the declared value and the real value are the same number by construction.
Aplash's ACP service is a different structure: the non-resident principal remains the importer and Aplash acts only as the registered customs contact (税関事務管理人) under Customs Act Article 95. In this structure the declared value obligation still sits with the non-resident principal, so onboarding should confirm upfront whether royalties, rebates, or any payment outside the main goods invoice touch the imported goods, so the ACP relationship is not built on top of an incomplete declared value from day one.
If your supplier has proposed a split-invoice arrangement, or you are unsure whether a royalty or licence payment belongs in your declared value, that is a valuation question worth confirming before the next shipment rather than after an audit notice arrives. See our Japan customs valuation guide for how the CIF valuation mechanics work, and our currency and exchange rate guide for how the same actual-price principle applies when payments are made in a foreign currency.
Frequently Asked Questions
Can my supplier just give me a lower invoice for customs purposes while I actually pay the full price separately?
No. Japan Customs values goods at the actual price paid or payable, so a lower invoice with the balance paid through a separate channel does not lower the customs value; it creates a gap between the declared value and the real value, which is a false declaration under Customs Act Article 111.
Is under-invoicing only a problem if Japan Customs inspects the shipment at the border?
No. The more common discovery route is a post-clearance audit conducted well after the goods have cleared, where an auditor reviews the importer's accounting and banking records against the declared values, so the exposure does not go away once the shipment has physically entered Japan.
Does leaving a royalty payment off the customs invoice count as under-invoicing?
It can. Where the royalty or licence fee is a condition of being allowed to buy and import the goods and relates to the goods themselves, Customs Tariff Act Article 4 requires it to be included in the dutiable value, and Japan Customs has audited and reclassified declarations that separated the royalty out specifically to reduce the declared value.
This article is informational only and does not constitute legal, tax, or regulatory advice. Consult a qualified advisor before acting on the content. Last updated: August 2026.