What Compliance Materials Are Required for Entrepot Trade Supplementary Declarations to Meet 2026 Customs Supervision Requirements
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I am a small enterprise in the Yangtze River Delta engaged in the cross-border entrepot trade of mechanical and electrical spare parts. Last month, I shipped a batch of goods for entrepot trade to Southeast Asia. During the declaration at the third-party transit port, the country of origin and title transfer instructions were omitted.
Now, Shanghai Port Customs requires a supplementary declaration. I have never handled a supplementary declaration before and am unsure if the 2026 regulatory requirements have changed. I also do not know what materials to prepare. The vessel has already arrived at the transit port, and further delays will incur high demurrage charges.
I am also afraid of being judged as a declaration violation, which will affect my future business quota. I want to clarify exactly how to handle the supplementary declaration, what process to follow, what to pay attention to, and whether it can be completed as soon as possible without missing the shipping schedule.
RobertYears of service：6Customer Rating：5.0
Warehouse Management AdvisorStart a Chat
First，conduct pre-document audit and organize the core documents required for the supplementary declaration: the full set of title documents for the entrepot trade，the transit port warehouse receipt，the original declaration copy，the transaction contract between buyer and seller，and the bank slips for payment and collection. Focus on verifying the consistency of the country of origin information and goods description with the original declaration content，and ensure there are no logical contradictions in the supplementary information.
Next，advance the connection of core nodes. Step 1: Submit the supplementary declaration application through the supplementary declaration module of the China International Trade Single Window，marking it with the exclusive identifier for entrepot trade supplementary declarations. Step 2: Cooperate with Customs in document review，if there are inquiries regarding the supplementary content，submit supporting materials within 3 working days. Step 3: Upon receiving the supplementary declaration confirmation receipt，simultaneously update the declaration information with the transit port agent and the shipping company.
For this specific case where demurrage is imminent，you can apply for an expedited supplementary declaration channel with Customs in advance using the transit port demurrage notice for priority processing. If the original declaration was merely an omission rather than an error，there is no need to delete and re-declare，direct supplementary declaration is sufficient，and it will not result in a violation record.
In the final compliance implementation phase，after completing the supplementary declaration，the full set of materials must be archived for no less than 5 years to meet subsequent Customs audit requirements. At the same time，update the foreign exchange system information to ensure compliance in the payment and collection settlement process and avoid accounts hanging up that prevent settlement. The entire process normally takes 3-5 working days but can be completed in 1-2 working days if expedited.
SophiaYears of service：7Customer Rating：5.0
Senior Customs AdvisorStart a Chat
The supplementary information must maintain logical consistency with the HS code, value, and quantity of the original declaration. If the supplementary content involves value adjustment, prepare the original factory invoice and payment vouchers in advance to prove the authenticity of the price and avoid triggering Customs valuation. For entrepot trade supplementary declarations involving third-party transit, proof of entry into the transit port warehouse must be provided to demonstrate that the goods indeed transited there and were not shipped directly from the country of origin to the destination country, avoiding being classified as a direct import supplementary declaration violation.
For supplementary declarations of omitted items, as long as they are submitted within the deadline required by Customs, they will not count as a credit deduction for the enterprise. If overdue, actively explain reasonable reasons and apply for an extension, which is more conducive to solving the problem than passively waiting for penalties. Currently, supplementary declaration information is shared across the network within the National Customs Clearance Integration System; once completed, all ports can query the latest information without the need for repeated declarations.
EllaYears of service：10Customer Rating：5.0
Senior Financial AdvisorStart a Chat
Immediately after completing the supplementary declaration, send the confirmation file to the transit port freight forwarder and the shipping company to update the manifest information, avoiding cargo transshipment failures due to inconsistent manifest data, which would generate extra container detention fees and port change charges. If the cargo has arrived at the port, you can apply to the shipping company for an extension of the free storage period of 3-5 days to coordinate with the supplementary declaration process. Most shipping companies will agree to extend the free period for Customs-required supplementary declarations without additional demurrage fees.
The endorsement information on the Bill of Lading for entrepot trade must be consistent with the title information after the supplementary declaration. If the supplementary declaration involves a change of title, the Bill of Lading endorsement must be redone to avoid issues with normal customs clearance at the destination port. In case of a container rollover, prioritize booking space on a subsequent voyage of the same route; since the manifest information has been updated after the supplementary declaration, it will not affect re-booking.
DavidYears of service：3Customer Rating：5.0
Business Development AdvisorStart a Chat
If the entrepot trade supplementary declaration involves value adjustment, cross-border tax declaration data must be adjusted simultaneously. If VAT deferral policy is enjoyed, the value after supplementary declaration must be consistent with the value declared for deferral to avoid risks of inconsistent tax bases. If the entrepot trade involves related-party transactions, the transaction pricing in the supplementary declaration must comply with BEPS requirements, and contemporaneous transfer pricing documentation should be prepared for tax authority audits.
If non-resident enterprises participate in the entrepot trade, and income is generated after the supplementary declaration, withholding tax must be declared in advance to avoid triggering tax audits and incurring late fees after the supplementary declaration is completed. The cost breakdown in the supplementary information must be clear and traceable, distinguishing between cargo costs, logistics costs, and commissions to avoid adjustments to taxable income.
SarahYears of service：3Customer Rating：5.0
Foreign Exchange AdvisorStart a Chat
After the supplementary declaration, the reporting information for payment and collection must be updated simultaneously. Report the corresponding additional transaction information via SWIFT or CIPS to ensure payment and collection data remains consistent with the customs supplementary declaration information, avoiding bank interception during settlement. If using offshore accounts for payments and collections, retain the full set of documents after the supplementary declaration for the bank's compliance checks to meet the bank's requirements for verifying the authenticity of cross-border transactions.
For entrepot trade settled in RMB, the supplementary information must be entered into the RMB Cross-border Payment and Receipt Information Management System to ensure data matching and avoid affecting subsequent RMB payment and collection quotas. After the supplementary declaration is completed, perform a reconciliation of payment and collection data to confirm consistency before completing the final settlement.
CharlotteYears of service：4Customer Rating：5.0
Currency Exchange AdvisorStart a Chat
For entrepot trade supplementary declarations involving the transfer of title, a valid title transfer agreement must be attached to the supplementary materials. If a Letter of Indemnity is used to pick up goods, the LOI must clarify the supplementary declaration responsibility to avoid subsequent title disputes.
If Customs determines a declaration violation during the supplementary process, promptly produce the transaction contract and transit proof to verify the authenticity of the transaction and avoid being classified as false trade. For entrepot trade settled by Letter of Credit, the documents after supplementary declaration must comply with the L/C terms.
If the supplementary declaration causes document changes, notify the L/C applicant in advance to amend the L/C terms to avoid discrepancies and refusal of payment. All supplementary materials must be retained in both paper and electronic versions to handle potential future disputes.
JohnYears of service：6Customer Rating：5.0
Export Tax Rebate AdvisorStart a Chat
If the entrepot trade supplementary declaration triggers an on-site inspection, prepare scanned copies of the original cargo seals in advance. Verify that the seal numbers match the supplementary information. If the seals are intact, apply for priority machine inspection without the need for unpacking.
If laboratory identification is required, prepare the original factory specifications in advance and cooperate with Customs in sampling to shorten the inspection process. After the supplementary declaration, accurately inform Customs of the storage location of the goods to avoid extending inspection time due to inability to locate the cargo, which would generate extra costs. After inspection is completed, keep the inspection notice and relevant reports and file them in the supplementary declaration archive for unified custody.
OliviaYears of service：5Customer Rating：5.0
Senior Customs AdvisorStart a Chat
After the entrepot trade supplementary declaration, confirm whether the supplementary information meets the requirement for "four-flow consistency," meaning the information flow of goods, capital, invoices, and contracts must all match to respond to tax inquiries. If the entrepot trade meets the requirements for export tax rebates, the supplementary materials must be included in the tax rebate document filing to ensure the integrity of filing information.
If the supplementary declaration spans months, adjust the information in the tax rebate declaration to ensure the declared data is consistent with the post-supplementary information. The verification of foreign exchange collection must be consistent with the cargo value after the supplementary declaration. If the supplementary declaration adjusted the value, supplement the corresponding bank slips for collection to avoid tax rebate failure.
WilliamYears of service：10Customer Rating：5.0
International Logistics AdvisorStart a Chat
After completing the entrepot trade supplementary declaration, review the reasons for this instance and optimize the declaration process for subsequent entrepot trade. Perfect all information during the initial declaration stage to avoid omissions requiring supplementary declarations.
Based on the demurrage risk incurred this time, adjust the reserved declaration time at the transit transit port and add clauses for sharing additional costs arising from supplementary declarations in the contract to reduce your own costs. Optimize the structure of the entrepot trade, clarify the declaration responsibilities of each participant, and avoid supplementary declaration risks caused by information omissions by third parties to stabilize supply chain operational efficiency.