An importer has three months from the day after receiving notice of a duty reassessment (更正処分) to file either a request for reconsideration with the customs chief who issued it or a request for examination with the Minister of Finance. Miss that window and the reassessment becomes final, regardless of whether the HS classification behind it was correct.
What triggers a duty reassessment in the first place?#
A reassessment disposition under the Customs Act (関税法) is the customs chief's correction of a declared duty amount, almost always because a post-clearance review or audit concluded the importer's HS classification, value, or origin claim understated what was owed. It raises the duty rate, the duty base, or both, and it arrives as a written notice with a stated amount and a stated reason.
The trigger is one of three things: a desk review that flags a classification inconsistent with the tariff schedule, a post-clearance audit that reopens a shipment already cleared, or a valuation challenge where the declared transaction value does not match supporting documents. Classification disputes dominate because a single heading choice, such as whether an item falls under an "other" subheading carrying a materially higher rate than the more specific one the importer used, changes the duty owed on every unit in the shipment. The dispute is rarely about the goods themselves. It centers on which line of the tariff schedule the goods belong on, a line that was often never confirmed in writing before the goods shipped.
What is the deadline to appeal a Japan Customs duty reassessment?#
Three months from the day after the importer receives notice of the disposition, for either of the two initial appeal routes. The Customs Act (関税法) sets this period under its appeal provisions (Articles 89 through 93), and it runs regardless of whether the importer intends to negotiate informally with the customs office first.
Two routes exist and they go to different places. A 再調査の請求 (request for reconsideration) goes back to the same customs chief who issued the disposition, asking that office to revisit its own decision. A 審査請求 (request for examination) skips that step and goes directly to the Minister of Finance. Both carry the identical three-month clock, so choosing reconsideration does not buy extra time; it is a sequencing choice.
An importer with a clean technical argument, the kind that would have gone into an advance ruling (事前教示制度) request before the shipment moved, has reason to go straight to the Minister of Finance rather than ask the originating office to reverse itself. An importer who believes the disposition rests on a factual error the local customs office can fix quickly, a miscounted quantity or a misread invoice line, has reason to start with reconsideration instead.
What happens after you file a request for reconsideration?#
If the reconsideration decision still goes against the importer, the further appeal to the Minister of Finance (審査請求) must be filed within one month from the day after that reconsideration decision is served. That second clock is tighter than the first three-month window and starts fresh on the date the reconsideration decision is served.
This sequencing matters because an importer who files for reconsideration and then waits to see what else happens before deciding whether to escalate can burn through a one-month window without noticing. The reconsideration step does not pause or extend any other deadline; it creates a new, shorter one that only starts once the customs chief responds.
Can you sue Japan Customs over a duty reassessment?#
Yes, but only after the administrative appeal route has run its course. The lawsuit must be filed within six months of receiving the written appeal decision (裁決書謄本), and for this category of customs assessment dispute the appeal decision has to come first; an importer cannot go to court while the 審査請求 is still pending.
The practical effect is a layered clock: three months to open the first appeal, a potential further one month if reconsideration is chosen and denied, then up to six months to litigate once the Minister of Finance has ruled. An importer who wants to preserve every option should calendar each deadline the day the reassessment notice arrives rather than waiting for legal counsel to be retained, since the first three-month period is already running by then.
Three points worth holding in mind before any of these deadlines start running.
(a) The clock on the first appeal starts the day after the importer receives notice. The disposition's printed date and the date customs mailed it do not control it. (b) Choosing reconsideration over going straight to the Minister of Finance does not pause or extend the three-month window; it only adds a second, one-month window later if the reconsideration result is still unfavorable. (c) Litigation is only available after the administrative appeal decision is issued, and the six-month clock for that lawsuit runs from service of the written decision.
How do you avoid a reassessment appeal in the first place?#
The reliable way to avoid litigating a classification dispute after the fact is to lock the classification in before the goods move. An advance ruling (事前教示制度) binds the customs authority to a stated HS code for future imports of the identical goods, which removes the classification question from the table if a later audit looks at the file. The same logic applies to declared value: getting the valuation methodology confirmed up front, including how exchange rate movements between contract date and entry date factor into the declared base, closes off the other common source of reassessment.
Where goods are already moving and a reassessment notice has arrived, the practical task is building the record for whichever appeal route is chosen within the three-month window: the original classification or valuation rationale, the commercial invoice, and any prior correspondence with the customs office. Aplash assesses this individually before any scope or terms are set, since the right first move depends on whether the dispute is a factual error, a genuine classification judgment call, or a valuation position that needs tariff schedule and transaction evidence lined up before the clock on reconsideration runs out. Where a customs attorney power of attorney (通関委任状) needs to be arranged to handle the filing on the importer's behalf, see Aplash's customs attorney (ACP) service.
Frequently Asked Questions#
Does the three-month appeal deadline start from the date on the reassessment notice or the date I receive it?
It starts the day after the importer receives the notice, regardless of the date printed on the disposition or the date customs mailed it. Keep the envelope or the delivery record, because the receipt date is the fact the deadline depends on.
If I file a request for reconsideration, do I lose the right to go straight to the Minister of Finance later?
No. Filing a 再調査の請求 (request for reconsideration) first does not forfeit the right to escalate; if the reconsideration decision is unfavorable, the importer can still file a 審査請求 (request for examination) with the Minister of Finance, but only within one month from the day after that reconsideration decision is served.
Can I go to court immediately instead of filing an administrative appeal?
Only after the administrative appeal route has been exhausted for this type of customs assessment dispute: a written appeal decision has to be issued before a lawsuit can be filed. The lawsuit deadline then runs six months from receiving that written decision (裁決書謄本).
What is the difference between reconsideration and a request for examination?
A request for reconsideration (再調査の請求) asks the same customs chief who issued the reassessment to review its own decision, while a request for examination (審査請求) goes directly to the Minister of Finance. Both are filed under the Customs Act (関税法) appeal provisions and both carry the same initial three-month deadline from notice. Reconsideration is a sequencing choice.
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: October 2026.