Foreign manufacturers pricing a Japan shipment usually work in their own home currency, then treat the yen amount as a simple conversion detail. It is not simple, and it is not a detail. Customs duty and import consumption tax (輸入消費税) in Japan are assessed in yen, on a yen customs value, even when the underlying commercial invoice is denominated in US dollars, euros, or another currency. The exchange rate used to bridge that gap, and the timing mismatch between when a price is agreed and when it is actually converted for customs purposes, has a direct effect on the duty and tax an IOR or ACP structure ends up paying, and on the cash flow of whichever party is fronting that payment.
Why the Conversion Point Matters
A commercial invoice denominated in a foreign currency states a transaction price in that currency. Japan Customs, however, requires the customs value used to calculate duty and import consumption tax to be expressed in yen. That conversion happens using an exchange rate applied at the time of the customs declaration, not the exchange rate in effect when the commercial contract was negotiated or when the purchase order was placed. Between those two points, often weeks or months apart for goods produced to order or shipped by sea, the yen can move meaningfully against the invoice currency.
Because duty is a percentage of the yen-converted customs value, and import consumption tax is 10% of that same customs value plus duty, a currency move in either direction changes the actual yen amount payable at clearance, even though the underlying foreign-currency invoice price never changed. A weaker yen at the time of conversion increases the yen customs value and the yen amount of duty and tax due; a stronger yen decreases it. Neither party controls this, and it is not a pricing error by either the seller or the importer; it is a structural feature of converting a foreign-currency transaction into a yen-denominated customs obligation.
Who Actually Feels the Impact
The answer depends on which structure is in place.
Under IOR (buy-and-sell). The IOR provider is the entity that pays duty and import consumption tax at clearance, in yen, using the exchange rate applicable at the time of declaration. If the IOR provider's commercial terms with the client were fixed based on an earlier estimate of the customs value, a currency move between quoting and clearance changes the actual cash the IOR provider has to front, even though the client's invoice price has not changed. This is one of the reasons IOR providers price with reference to the shipment's CIF value at the time of clearance rather than locking in a fixed duty-and-tax number in advance of shipment.
Under ACP. The client remains the named importer and pays duty and import consumption tax directly, so the client bears the currency exposure on its own customs value directly, without an intermediary front-loading the yen payment. The exposure exists either way; ACP simply places it with the party who was already the legal importer rather than passing it through a service provider's cash position.
Practical Effects Worth Planning For
(a) Landed cost estimates built early in a product's development cycle can be stale by the time goods actually ship. A landed cost model built when a currency pair was at one level, then used to set a Japan retail price months later, may understate or overstate the actual duty and tax burden if the exchange rate has moved materially in the interim.
(b) High-value or high-duty-rate shipments carry more absolute currency exposure than low-value ones. A percentage-based duty rate applied to a larger yen customs value means the same percentage currency move translates into a larger absolute yen swing, which matters most for capital equipment and other high CIF-value shipments.
(c) Frequent, regular shippers see the exposure average out somewhat over time; occasional or one-off shippers do not. A company shipping into Japan monthly experiences a rolling average of exchange rate conditions across many declarations. A company making a single large shipment is fully exposed to whatever the rate happens to be on that one declaration date.
(d) The exposure sits separately from, and in addition to, ordinary commercial FX risk on the underlying sale. A foreign manufacturer already manages currency risk on the revenue side of a Japan sale if it invoices in a foreign currency; the customs-value conversion described here is a distinct, additional exposure tied specifically to the duty and tax calculation, not to the commercial payment itself.
What to Confirm Before Shipping
(a) Whether your IOR or ACP provider's quoted duty and tax estimate was calculated using a current exchange rate or an earlier assumption, particularly for shipments with a long lead time between quoting and actual clearance.
(b) How your provider's commercial terms treat a material currency movement between quoting and clearance, if the engagement involves the provider fronting duty and tax on your behalf.
(c) Whether your internal landed cost or retail pricing model was built on a currency assumption that may no longer reflect current conditions, particularly for goods planned well in advance of shipment.
(d) Whether the scale of a planned shipment is large enough, in absolute yen terms, to warrant treating the customs-value currency exposure as its own line item rather than folding it into general FX risk management.
Conclusion
Currency movement between the time a Japan shipment is priced and the time it actually clears customs is not a rounding detail. It changes the real yen amount of duty and import consumption tax due at clearance, regardless of the structure used, and it lands on whichever party is fronting that payment, the IOR provider under an IOR structure or the client directly under ACP. Building this into landed cost models and provider commercial terms, rather than treating the yen conversion as an afterthought, is what keeps a Japan shipment's actual cost in line with what was planned.
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: 2026-07.