Foreign chemical manufacturers and raw material suppliers exporting to Japan face a compliance picture that is categorically more complex than general merchandise. The importer of record for a chemical shipment is not merely the party responsible for paying customs duties. It is the party that assumes a range of chemical-specific regulatory obligations under Japanese law: notification duties, safety documentation requirements, and post-clearance exposure that can follow the goods well beyond the port gate. Overseas manufacturers who assume that a Japanese trading company or distributor absorbs all of this by default are routinely wrong, and the consequences of that assumption have grown sharper since Japan's customs reform took effect in October 2023. This post sets out the regulatory layers, the documentation requirements, and the two compliant structures available to non-resident manufacturers.
The Problem: Disposition Rights and the October 2023 Reform
Before October 2023, Japan Customs assessed the identity of the importer of record on a largely administrative basis. The October 2023 reform hardened that standard. The importer named on the import declaration (輸入申告) must now be the party that holds genuine disposition rights (処分権限) over the goods at the time of declaration. A trading company or distributor that appears on the declaration as a procedural convenience, without actually purchasing the goods or holding title, no longer satisfies this requirement.
For chemical manufacturers, this creates a specific problem. Many non-resident exporters sell on terms where the Japanese distributor takes title, and where that structure is genuine, the distributor is the lawful importer. But where the arrangement is thinner, where the overseas manufacturer is effectively directing the disposal of the goods and the distributor is appearing as a nominee, that arrangement is non-compliant under the reformed standard.
Even where the distributor genuinely holds disposition rights, the regulatory obligations that attach to chemical imports are layered in ways that general merchandise importers do not encounter. A distributor that is competent to clear general goods may not have the internal capability to manage the notification and safety documentation requirements that chemical imports carry. The overseas manufacturer needs to understand what those requirements are, because it is ultimately responsible for supplying the underlying documentation regardless of which party is named as importer.
The Regulatory Layers for Chemical Imports
Chemical Substances Control Law (化審法)
The Chemical Substances Control Law (化学物質の審査及び製造等の規制に関する法律, commonly referred to as 化審法) governs the import of chemical substances into Japan. Its core logic is a classification system that sorts chemical substances into tiers based on their environmental and health risk profiles. New chemical substances, meaning those not already registered in Japan's existing substance inventory, require a pre-import notification or clearance process before the first commercial import. The obligation to complete this process attaches to the importer of record.
This is a pre-import step, not a customs clearance step. A customs broker cannot file the import declaration for a new notifiable substance until the 化審法 notification process has been completed and the substance has cleared the required screening. For overseas manufacturers planning a first import of a chemical substance that has not previously been notified in Japan, this process can take several months and must be factored into the market entry timeline. Neither of the two import structures described later in this post shortens the notification timeline; the substance must clear the process before any commercial import can proceed.
Existing chemical substances already on Japan's inventory are generally importable without pre-import notification under 化審法, though specific classifications within the inventory carry ongoing restrictions on quantities, uses, and reporting obligations. Manufacturers should confirm their substance's inventory status before assuming notification is unnecessary.
Industrial Safety and Health Act (労働安全衛生法)
The Industrial Safety and Health Act (労働安全衛生法) imposes a separate layer of documentation obligations on chemical importers. For chemical substances within scope of the Act, the importer is responsible for ensuring that Safety Data Sheets (SDS, 安全データシート) are prepared in Japanese and provided to downstream buyers in Japan. The obligation runs with the import: if Aplash acts as importer of record, Aplash holds the nominal SDS delivery obligation at the border, but the manufacturer must supply the accurate compositional and safety data that underpins the Japanese-language SDS.
For manufacturers whose products are already SDS-documented in English or another language, this typically means ensuring a compliant Japanese-language translation is prepared to the format required under Japanese law before the shipment is dispatched. Post-clearance correction of SDS deficiencies is operationally awkward and creates downstream supply chain friction.
Why the Regulatory Obligations Follow the Import Declaration
Both of these regulatory regimes share a structural feature that overseas manufacturers sometimes overlook: the compliance obligation attaches to whoever is named as the importer on the import declaration. If a trading company is named as importer but lacks the substance documentation, the regulatory obligations are misallocated and unresolvable at clearance. If the manufacturer is named as importer via the ACP structure described below, the manufacturer directly holds the 化審法 and 労働安全衛生法 obligations and must be prepared to manage them.
Choosing the import structure is therefore not merely a commercial or logistics decision. It is a regulatory design decision.
What the IOR Needs from the Manufacturer: Documentation
Chemical import declarations require a more complete documentation package than standard commercial goods. The customs broker (通関業者) filing the import declaration on behalf of the importer must be able to support accurate declaration with the underlying technical data. The standard commercial invoice and packing list are necessary but not sufficient for many chemical shipments.
The documentation package for a chemical import typically requires:
(a) Accurate Harmonized System (HS) classification for the chemical. Industrial chemicals most commonly fall within Chapters 28 (inorganic chemicals), 29 (organic chemicals), Chapter 30 (pharmaceutical preparations), or Chapter 38 (miscellaneous chemical products). Within Chapters 28 and 29 especially, correct classification requires granular identification of the substance by chemical composition, not by trade name. An HS heading that is correct at the chapter level can still be wrong at the six or eight-digit level, and the tariff and import controls vary significantly within these chapters.
(b) Chemical substance name in IUPAC notation or other recognized systematic nomenclature. Trade names and brand names are not sufficient for classification or notification purposes. The Japanese customs declaration and any 化審法 notification filing require the substance to be identified by its recognized systematic name and, where applicable, its CAS number.
(c) Japanese-language SDS or equivalent safety documentation for controlled substances, prepared to the format required by Japanese industrial safety law.
(d) Where the substance is a new chemical requiring pre-import notification under 化審法, confirmation that the notification process has been completed and that clearance has been obtained.
The importer of record is legally responsible for the accuracy of the customs declaration and for the regulatory compliance of the import. The manufacturer, however, is the only party that can supply the underlying technical data. This creates a shared documentation obligation: the IOR provides the regulatory and customs filing capability; the manufacturer provides the substance-specific information that makes the filing accurate.
Two Compliant Structures for Chemical Imports
Structure A: Aplash as IOR (Buy-and-Sell)
Under the IOR structure, Aplash purchases the chemicals from the overseas manufacturer, files the import declaration in Aplash's own name as the party holding genuine disposition rights, pays customs duties and import consumption tax (輸入消費税), and re-sells the goods to the Japanese buyer. The re-sale transaction is invoiced with a qualified invoice (適格請求書), enabling the downstream buyer to claim consumption tax input credit. The manufacturer's transaction is a standard commercial export sale; its counterparty is Aplash.
At the customs border, Aplash holds the 化審法 notification obligation and the 労働安全衛生法 SDS delivery obligation as the named importer. In practice, this means that Aplash requires the manufacturer to provide accurate substance identification, CAS numbers, and Japanese-language SDS documentation before the shipment is dispatched. Aplash coordinates the import declaration through a specialist customs broker with chemical classification experience. The manufacturer's primary responsibility after structuring the commercial agreement is ensuring the documentation package is complete and accurate.
This structure is the most appropriate choice when the Japanese buyer does not wish to appear on customs documentation, when the manufacturer has no Japan entity and no intention to create one, or when the parties want a clean separation between the export transaction and the Japan-side regulatory obligations.
Structure B: Manufacturer as IOR via ACP
Under the Attorney for Customs Procedures (税関事務管理人) structure, the overseas manufacturer is named as the importer on the import declaration and directly holds all customs and regulatory obligations. Article 95 of the Customs Act (関税法) permits a non-resident to appoint a Japan-resident attorney for customs procedures to act on its behalf before Japan Customs. Aplash fills this role.
In Structure B, the 化審法 notification obligation and the 労働安全衛生法 SDS obligation rest directly with the manufacturer as the named importer. This gives the manufacturer maximum control over its Japan customs records, its substance notification history, and its own regulatory filing posture. It also means the manufacturer must be prepared to handle Japanese regulatory correspondence and to maintain its own compliance records.
Structure B suits manufacturers who have recurring import programs, who want to build their own Japan customs record over time, or who have specific commercial or tax reasons for being named as the importer. It requires more sustained regulatory engagement from the manufacturer than Structure A.
The two structures are not alternatives: they reflect different commercial and regulatory relationships, and the choice between them should be driven by the manufacturer's Japan market entry plan, its appetite for direct regulatory engagement, and the nature of its relationship with the Japanese buyer.
The Dangerous Goods Overlap
Many chemicals and raw materials that require IOR structuring also fall under dangerous goods regulations for transport: the IATA Dangerous Goods Regulations (IATA DGR) for air freight, and the International Maritime Dangerous Goods Code (IMDG Code) for sea freight. Dangerous goods classification is a separate regulatory layer from customs IOR structure, governed by different rules and enforced at the transport carrier level rather than at customs.
Being classified as a dangerous good does not exempt a shipment from the importer-of-record rules. Both layers apply simultaneously. A solvent that is classified as a flammable liquid under IATA DGR must still be imported by a party holding genuine disposition rights, must still satisfy the 化審法 substance status requirements, and must still be supported by compliant SDS documentation. The transport compliance layer and the customs and regulatory compliance layer must each be addressed on their own terms.
For detailed coverage of the dangerous goods transport layer, including the interaction between DG classification and customs IOR structure, see the post on Japan IOR for lithium battery and dangerous goods imports referenced below.
Customs Classification Accuracy for Chemicals
Chemicals are among the most classification-sensitive product categories in Japan's tariff schedule. Chapters 28 and 29 require classification by chemical composition at a level of specificity that most non-chemical importers never encounter. A compound that appears to belong in Chapter 29 on a general reading may, on examination of its mixtures or preparation state, properly fall in Chapter 30 or Chapter 38. The difference in classification can mean a different tariff rate, a different import control regime, and a different set of required documentation.
The importer of record bears legal responsibility for the accuracy of the HS classification on the import declaration. Misclassification of chemicals creates both tariff underpayment risk and post-clearance audit exposure. Japan Customs has expanded post-clearance audit activity in recent years, and chemical products with complex or ambiguous classification are a recognised audit focus area.
Aplash works with specialist customs brokers who have experience in chemical tariff classification. For complex substances or novel preparations, a pre-import classification review is prudent. The manufacturer must supply accurate compositional data, including the substance's purity grade, any diluents or carrier solvents, and the specific application for which it is being imported, all of which can affect classification. For a detailed discussion of how to approach HS classification and advance ruling procedures in Japan, see the post on customs valuation and import declaration referenced below.
A Practical Note on New Chemical Substances
The most time-critical regulatory step for overseas chemical manufacturers planning a first import to Japan is the 化審法 notification process for new chemical substances. If a substance has not previously been notified in Japan and is not already on Japan's existing substance inventory, this process must be completed before the first commercial import can legally take place.
The notification process requires preparation and submission of a technical dossier to the relevant Japanese ministries, and the review period is measured in months. Neither Structure A nor Structure B shortens this timeline. The substance must clear the notification process regardless of which import structure is used. For manufacturers accustomed to importing into markets where no pre-import substance notification is required, this timeline is frequently underestimated, and shipments have been held or delayed as a result.
Aplash can assist manufacturers with mapping their product list against the existing Japanese substance inventory, identifying which substances require 化審法 notification before first import, and structuring the regulatory preparation process. The notification itself is managed in coordination with qualified Japanese specialists. The operational implication is that market entry planning for chemical products must include a regulatory pre-clearance phase before commercial shipment can begin.
Before the First Shipment
Overseas chemical manufacturers preparing to export to Japan should complete three preparatory steps before the first shipment departs. First, map the product list against Japan's chemical substance inventory to identify which substances require pre-import notification under 化審法 and how long that process is likely to take. Second, confirm HS classification accuracy at the eight-digit level for each product, supplying accurate compositional data to support a classification review. Third, choose a compliant IOR structure based on the manufacturer's commercial relationship with the Japanese buyer, its appetite for direct regulatory engagement, and whether it intends to build a recurring Japan import program or execute a one-time market entry.
Post-clearance corrections for chemical shipments are structurally more complex than for general goods. Misallocation of regulatory obligations, inaccurate substance identification, or use of a non-compliant import structure creates examination risk and can delay or block subsequent shipments. Getting the structure right before the first import declaration is filed is substantially less costly than correcting it afterwards.
This article is informational only and does not constitute legal, tax, or regulatory advice. Consult a qualified advisor before acting on the content. Aplash is a regulatory strategy and market entry firm. Last updated: June 2026.