---
title: "What Core Documents and Compliance Supporting Documents Are Required for Export Customs Declaration Under General Trade?"
description: "When a foreign trade enterprise focusing on beauty product export attempts to export hazardous chemicals for the first time，its pre-declaration is rejected due to unfamiliarity with requirements on customs declaration documents，leading to high warehouse rent caused by cargo detention at the port. The enterprise also faces risks of customs cargo detention and damage to its customs credit rating. This article accurately breaks down required customs declaration documents for general trade，cross-bor..."
url: "https://www.sh-zhongshen.com/en/qa/general-trade-export-customs-declaration-core-and-compliance-supporting-documents.html"
language: "en"
type: "Q&A"
category: "Customs Declaration Q&A"
datePublished: "2026-07-29"
dateModified: "2026-07-29"
brand: "Zhongshen Trading China"
answerCount: 8
---

# What Core Documents and Compliance Supporting Documents Are Required for Export Customs Declaration Under General Trade?

## Question

 I am from a foreign trade enterprise mainly engaged in beauty product export based in Shanghai, China. We have long handled export of general cargo under general trade. Recently, we attempted for the first time to ship nail polish (Category 3 hazardous chemical) to the EU via general trade, and we also have a batch of beauty product sets for cross-border e-commerce B2B exported to Southeast Asia. Last week, our pre-declaration was rejected by customs due to our unfamiliarity with document requirements for hazardous chemical customs declaration. The goods have been stored in Lingang Warehouse for 5 days, and the daily warehouse rent and port detention warning have left me extremely overwhelmed. I am even more worried that another mistake in formal declaration will lead to cargo detention, confiscation and damage to our enterprise's customs credit rating. I want to clarify: for exports under different trade modes (general trade, cross-border e-commerce B2B) and special categories (hazardous chemicals), what customs declaration documents are required respectively? What easily overlooked details can help avoid pre-declaration failure? 

## Answers
                            
### Answer 1 — Best Answer

First comes pre-document review details: targeted document review logic shall be applied for different scenarios. For general trade export，you first need to confirm that the business scope on your business license covers the exported category. Core documents include customs declaration form，commercial invoice，packing list，export sales contract，and customs brokerage power of attorney (when you entrust an agent). Supporting documents such as GSP certificate of origin can be prepared as needed. For cross-border e-commerce B2B export，you need to additionally review **Cross-border E-commerce B2B Export Declaration List** to ensure it matches the platform order number and logistics waybill number. For hazardous chemical export，you must complete **Hazardous Characteristic Classification and Identification Report** in advance，which is the core basis for all subsequent documents.

Connection of core nodes: Before pre-declaration，you need to synchronize 3 key pieces of information with your customs broker: first，the result of **Commodity Code Pre-classification Review**，to ensure it matches the customs code database，second，the UN number and packaging category of hazardous chemicals must be accurately filled in the customs declaration form，third，the transaction records of cross-border e-commerce must be traceable. All documents shall be unified in PDF format to avoid pre-declaration rejection caused by format non-compliance.

Contingency plan: If pre-declaration is rejected，you need to check the rejection reason via the Customs Single Window immediately. If it is caused by missing documents，supplement and submit within 24 hours. If it is caused by code classification dispute，contact an institution with pre-classification qualification immediately to issue a classification opinion，and coordinate with the warehouse to apply for a 1-3 day temporary free storage period to reduce warehouse rent loss.

Final compliance implementation: All customs declaration documents shall be archived electronically for no less than 5 years，and paper documents shall be kept for more than 3 years，to ensure they can be retrieved at any time for subsequent customs audits. Meanwhile，sort out the customs declaration document preparation process quarterly，optimize internal document circulation nodes，and improve declaration efficiency.

**status:** accepted
**Author:** Eric Zhou
**Date:** 2026-07-29

### Answer 2

The commodity code in customs declaration documents is the core basis. If classification error occurs, it will not only lead to pre-declaration rejection, but also may trigger customs price verification disputes. For example, if Category 3 hazardous chemical nail polish is mistakenly classified under the code for ordinary cosmetics, the customs system will automatically issue an alert, trigger manual review, and even on-site inspection. You need to supplement documents such as hazardous characteristic classification and identification report and packaging identification certificate at this time.

If you cannot provide them in time, the goods will be moved to a hazardous chemical supervision warehouse, resulting in high warehouse rent. The correct practice is to entrust a qualified pre-classification institution to issue the *Pre-classification Opinion for Import and Export Commodities* during the stock preparation stage, and submit it as a supporting customs declaration document, which can effectively reduce the probability of classification disputes. In addition, the "domestic supply origin" on the customs declaration form must match the address of the VAT invoice issuer, to avoid triggering tax audit due to inconsistent origin.

**status:** suggested
**Author:** Evelyn Li
**Date:** 2026-07-29

### Answer 3

The weight and dimension data on the packing list and customs declaration form in export customs declaration documents must be fully consistent with that on the bill of lading and manifest. Any deviation will lead to data inconsistency between the manifest and customs declaration form, prevent the goods from being loaded, and even cause port detention.

For example, if the total weight marked on the packing list is 1000kg, while the manifest submitted by the freight forwarder is 980kg, the customs system will automatically intercept the declaration. You need to modify the manifest and submit a change application, which takes at least 2-3 days and will make you miss the shipment date. In addition, the customs declaration documents for hazardous chemical export must match the packaging specification and quantity on the dangerous goods packaging certificate.

If the dangerous goods packaging certificate marks 100 cartons while the packing list lists 120, it will be identified as illegal packaging use, and the goods will be detained. It is recommended to check all data within 24 hours after container loading to ensure consistent data across customs declaration, logistics and manifest.

**status:** suggested
**Author:** Linda Gao
**Date:** 2026-07-29

### Answer 4

The product name, specification and model on the commercial invoice and customs declaration form in export customs declaration documents must be fully consistent with that on the special VAT invoice, otherwise the export tax refund declaration will be affected. For example, if the customs declaration form lists "water-based nail polish" while the VAT invoice lists "nail polish", the tax system will rule the product name inconsistent, fail the tax refund pre-review, and you need to apply for declaration deletion and re-declaration.

This not only delays tax refund, but also may trigger tax correspondence inspection. For cross-border e-commerce B2B export enterprises adopting VAT deferral mode, you need to mark "VAT Deferred Declaration" in the customs declaration documents and submit the corresponding cross-border e-commerce platform transaction certificate to ensure tax compliance. In addition, if the goods qualify for export tax refund, you need to accurately check the "tax refund" option on the customs declaration form to avoid tax refund failure caused by wrong checking.

**status:** suggested
**Author:** Daniel Xu
**Date:** 2026-07-29

### Answer 5

The amount on the export sales contract and commercial invoice in export customs declaration documents must match the actual foreign exchange receipt and payment amount. Any deviation will lead to failure of the foreign exchange receipt and payment compliance review. For example, if the declared FOB amount on the customs declaration form is 100,000 USD, while the actual foreign exchange receipt is 95,000 USD without reasonable reason (such as commission or discount), the State Administration of Foreign Exchange will list the enterprise as a key supervision object and affect subsequent foreign exchange operation rights.

For cross-border e-commerce B2B export enterprises, you need to submit a screenshot of cross-border e-commerce platform transaction records in the customs declaration documents as a supporting proof for foreign exchange receipt and payment. In addition, if you use Cross-Border Interbank Payment System (CIPS) for RMB cross-border payment, you need to mark "Settled in RMB" on the customs declaration form, and ensure the contract clearly states that the settlement currency is RMB, to avoid compliance risks caused by inconsistent settlement method.

**status:** suggested
**Author:** Kevin Lin
**Date:** 2026-07-29

### Answer 6

The trade terms (such as FOB, CIF) in export customs declaration documents must be fully consistent with that in the export sales contract, otherwise trade disputes will occur. For example, the contract stipulates FOB Shanghai, while the customs declaration form marks CIF Hamburg.

If the goods are damaged during transportation, the insurance company may refuse to compensate due to inconsistent trade terms, and the buyer may refuse to pay on the grounds that customs declaration documents do not match the contract. In addition, the customs declaration documents for hazardous chemical export must include the Material Safety Data Sheet (MSDS) for hazardous chemicals, and the transport name and hazardous characteristics in the MSDS must match that on the customs declaration form.

Otherwise, the enterprise will bear full legal liability if a transportation accident occurs. It is recommended to clearly stipulate the preparation standard for customs declaration documents when signing the export sales contract, to avoid legal risks caused by document inconsistency.

**status:** suggested
**Author:** Lucas Liu
**Date:** 2026-07-29

### Answer 7

The MSDS and hazardous chemical public label in export customs declaration documents must match the label on the actual goods. If inconsistency is found during on-site inspection, the goods will be detained. For example, if the hazard category marked on the MSDS is Category 3 (flammable liquid), while the goods label marks Category 4 (flammable solid), customs will rule this a violation.

You need to re-make the label and supplement documents, which takes at least 7-10 days and incurs high port detention fees. In addition, if general trade export goods involve intellectual property rights, you need to submit the intellectual property customs protection registration certificate in the customs declaration documents.

If unregistered trademarks are found on the goods during on-site inspection, it will be ruled infringement and the goods will be confiscated. It is recommended to check the actual goods label against the MSDS and customs declaration form one by one before customs declaration to ensure consistency.

**status:** suggested
**Author:** Jason Wu
**Date:** 2026-07-29

### Answer 8

Export customs declaration documents are the core basis for export tax refund declaration, all documents must be kept for no less than 5 years, otherwise you cannot pass the tax refund audit. For example, if the enterprise loses the export sales contract, the tax authority will rule the tax refund documents incomplete and suspend tax refund approval. You need to supplement the contract or provide other proof documents, which delays tax refund. In addition, the "export date" on the customs declaration form and the issuing date of the special VAT invoice must be within a reasonable range.

If the invoice is issued more than 90 days earlier than the export date, it will trigger tax correspondence inspection, and you need to provide documents such as goods preparation proof and transport certificate. For cross-border e-commerce B2B export enterprises, you need to archive cross-border e-commerce platform orders, logistics waybills and customs declaration forms in association, to ensure they can be retrieved at any time during tax refund audit and avoid tax refund failure caused by untraceable documents.

**status:** suggested
**Author:** Grace Wang
**Date:** 2026-07-29

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