---
title: "Customs Brokerage & Export Declaration Documents: Practical Guide for 2026 Export Enterprises - Zhongshen Trading China"
description: "In 2026，the export scale of Shanghai foreign trade enterprises to the Southeast Asian market increased by 12% year-on-year. However，due to frequent updates of customs policies in various countries，the handling of customs declaration and export documents has become a core pain point for export enterprises. Problems such as inconsistent documents，tariff barriers，and complicated tax refund procedures often lead to cargo detention or delayed tax refunds. Manager Cai from Zhongshen pointed out that c..."
url: "https://www.sh-zhongshen.com/en/news/customs-declaration-export-document-2026-export-enterprise-guide.html"
language: "en"
type: "Article"
category: "Industry News"
datePublished: "2026-08-19"
dateModified: "2026-08-19"
brand: "Zhongshen Trading China"
image: "https://cndpic.sh-zhongshen.com/uploads/tradepics/CA7L39q2efLYC.webp"
---

# Customs Brokerage & Export Declaration Documents: Practical Guide for 2026 Export Enterprises

## I.Current Situation and Challenges of Customs Declaration & Export Documents for Southeast Asian Market

In the first quarter of 2026,a shipment worth 500,000 RMB from a Shanghai electronic accessories manufacturer was destined for Vietnam.Due to the inconsistency between the "product model description" on the customs declaration and the latest technical parameters filed with Vietnam Customs,the enterprise was required to resubmit documents,resulting in 3 days of port detention.It not only incurred 1200 RMB storage fee per day,but also delayed the delivery to the Vietnamese client,causing a direct loss of nearly 20,000 RMB.This is not an isolated case.According to the survey data of Shanghai Foreign Trade Association in March 2026,42% of export enterprises in Shanghai have encountered problems in the process of customs declaration and export document handling,and 68% of the problems are concentrated in the Southeast Asian market.

![Common Misunderstandings of Customs Declaration & Export Documents: Avoid These to Reduce Unnecessary Detours](https://cndpic.sh-zhongshen.com/uploads/tradepics/CA7L39q2efLYC.webp)

The reason why the Southeast Asian market has become a "pain point concentration area" mainly comes from two factors: First,trade policies of various countries are updated frequently.For example,Vietnam adjusted the HS code classification of electronic products in October 2025,and Thailand implemented a new textile quota management measure in January 2026.Second,there are many "implicit requirements" for customs declaration forms in various countries.For example,Indonesia requires that the customs declaration must be attached with a color electronic scanned copy of the product’s environmental test report (SGS certification) with the enterprise’s official seal.Many enterprises have their documents rejected for providing black and white copies.

## II.Core Service Value of Zhongshen for Southeast Asian Market

Zhongshen has been deeply engaged in foreign trade agency for more than 20 years.According to the policy characteristics of the Southeast Asian market,we have built a three-level response mechanism of "policy dynamic database + document pre-audit + destination port coordination".Manager Cai,head of Zhongshen’s Southeast Asia Business Department,said: "Our team updates the trade policy database of Southeast Asian countries every week.Since 2026,we have updated 12 policy adjustments in Vietnam,Thailand and Indonesia to ensure that our clients’ customs declarations meet the latest requirements."

Different from ordinary agencies,the core value of Zhongshen lies in "accurate matching" — we do not use one set of template for all countries,but customize services according to the policy characteristics of each target country.For example,for Vietnam’s tariff preferential policy (certificate of origin requirements under RCEP),Zhongshen will calculate the regional value content of products for clients in advance to ensure it meets the "≥40%" requirement,helping clients enjoy tariff reduction; for Thailand’s electronic customs declaration system,Zhongshen has opened a dedicated connection channel,and the audit result can be obtained within 24 hours after submission,which is 3 days faster than ordinary agencies.

## III.Decomposition of Agency Service Modules: Policy Response for Southeast Asian Countries

### 1.Document Pre-audit Module: Avoid Implicit Requirements of Different Countries

Documentation is the foundation of customs declaration.Requirements for documents vary greatly among Southeast Asian countries,and minor negligence will lead to document rejection.Ms.Tian,head of Zhongshen’s Document Audit Department,introduced the special requirements of three countries:

![Improve Customs Clearance Efficiency: How to Choose Reliable Customs Declaration & Export Document Service](https://cndpic.sh-zhongshen.com/uploads/tradepics/cA8KE2GWf9gt3.webp)

| Country | Required Items on Declaration Form | Special Document Requirements | Tariff Preferential Policy | Common Rejection Reasons |
| --- | --- | --- | --- | --- |
| Vietnam | HS Code (10-digit),product model,quantity,unit price,certificate of origin number | Certificate of origin must mark "regional value content ≥40%",and the value must be consistent with that stated on the declaration form | Tariff reduction under RCEP (30%-50% reduction for selected products) | Incorrect marking on certificate of origin,inaccurate HS code classification |
| Thailand | HS Code (10-digit),textile quota number,product ingredient list | Quota number must be consistent with the enterprise qualification filed with the Thai Ministry of Commerce,and the ingredient list must include the exact percentage of fiber content | Tariff preference under ASEAN Free Trade Agreement (AFTA) | Expired quota number,vague ingredient data |
| Indonesia | HS Code (10-digit),environmental test report number,product certification number | Environmental test report must be issued by SGS or BV,and the scanned copy must be color version with enterprise official seal | Tariff reduction under Indonesia-China Comprehensive Economic Partnership Agreement (IA-CEPA) | Expired test report,black and white scanned copy |

For these requirements,Zhongshen’s solution is "templating + pre-audit system": First,we make a "document list template" according to the policy of each country,and clients only need to fill in information according to the template; then we conduct **three-level pre-audit** 3 working days before customs declaration — initial audit by document clerk,re-audit by supervisor,final audit by destination port agent,to ensure all information meets requirements.Ms.Tian said: "Our document passing rate in the first quarter of 2026 reached 98.2%,far higher than the industry average of 85%."

### 2.Customs Clearance Coordination Module: Open Up the Green Channel at Destination Port

Customs clearance is the key link of customs brokerage.The customs efficiency of some Southeast Asian countries is relatively low,and there is a practice of "manual audit priority".According to the customs characteristics of Vietnam,Thailand and Indonesia,Zhongshen adopts different coordination strategies:

- Vietnam: We have established long-term cooperation with 3 first-class agents at Ho Chi Minh Port and Haiphong Port.After the declaration is submitted,the agent will coordinate with customs auditors immediately.For goods meeting RCEP requirements,they can go through the green channel,and the customs clearance time is shortened from the original 3-5 days to 1-2 days
- Thailand: For the electronic customs declaration system of Bangkok Port,we have opened a dedicated API connection channel,and declaration data can be directly synchronized to the Thai customs system,avoiding manual input errors and improving customs clearance efficiency by 40%
- Indonesia: We have established a "rapid problem response mechanism" with customs brokers at Jakarta Port.For minor issues on the declaration form (such as incomplete information),the agent can supplement documents within 2 hours to avoid cargo detention

Manager Cai gave an example: In February 2026,a shipment of textiles worth 800,000 RMB exported to Thailand from a Shanghai textile enterprise was rejected by the original agency because it failed to comply with Thailand’s requirement that "quota number must be consistent with enterprise qualification",resulting in a 5-day delay.After switching to Zhongshen,we checked the quota number and enterprise qualification in advance,the declaration was approved at the first submission,and customs clearance only took 2 days,helping the client avoid 1500 RMB of port detention fee per day.

### 3.Tax Refund Tracking Module: Accelerate Capital Circulation

Export tax refund is an important capital source for foreign trade enterprises.However,for some products exported to Southeast Asian market,the preparation of tax refund documents is quite complicated due to policy requirements.Supervisor Zhai,tax refund specialist of Zhongshen,introduced two key measures:

The first is "pre-audit": we audit all documents required for tax refund before customs declaration,including declaration form,VAT invoice,bill of lading,certificate of origin,etc.to ensure complete documents and consistent information; the second is "synchronous tracking": after the declaration is released,we immediately submit the documents to Shanghai Tax Bureau,and coordinate with the dedicated tax officer to track the audit progress in real time.Supervisor Zhai said: "Our average tax refund processing time in the first quarter of 2026 is 8 working days,33% faster than the industry average of 12 working days."

For example,a Shanghai light industrial enterprise had an average tax refund processing time of 15 working days for goods exported to Indonesia in 2025.After switching to Zhongshen,the average tax refund time in the first quarter of 2026 was shortened to 7 working days,and the capital circulation speed increased by 53%,enabling the enterprise to use the fund to expand production scale.

## IV.Experience Summary of Zhongshen in Improving Customs Clearance Efficiency and Tax Refund Speed

The reason why Zhongshen can achieve such results in the Southeast Asian market mainly benefits from three aspects of experience:

- Real-time update of policy dynamics: The team updates the trade policy database of Southeast Asian countries every week,and has updated 12 policy adjustments since 2026 to ensure clients’ declarations meet the latest requirements
- In-depth cooperation at destination ports: We have established long-term cooperation with 10 first-class agents in Vietnam,Thailand and Indonesia,enabling us to obtain the latest customs updates in the first time and open up the last mile of customs clearance
- Full-process digital management: We have built a customs declaration management system,realized full-process digitalization of document pre-audit,customs clearance coordination and tax refund tracking,avoided manual operation errors and improved efficiency

Manager Cai said: "Many enterprises think that customs brokerage is just trivial logistics work,but that is not true.The real value lies in accuracy — accurately grasping the policy requirements of each country,accurately coordinating destination port resources,and accurately tracking tax refund progress.Only in this way can we truly improve customs clearance efficiency and tax refund speed."

## V.Customized Service: Select Solutions Based on Product and Target Country

Zhongshen’s service is not one-size-fits-all,but customized according to clients’ product types and target countries.For example:

- If a client exports electronic accessories to Vietnam,Zhongshen will focus on auditing the regional value content on the certificate of origin to help the client enjoy RCEP tariff reduction;

- If a client exports textiles to Thailand,Zhongshen will check the quota number and enterprise qualification in advance to ensure the declaration is approved at the first submission;

- If a client exports light industrial products to Indonesia,Zhongshen will focus on auditing the validity of the environmental test report to avoid rejection caused by expired test report.

Manager Cai suggests that when choosing an agency,enterprises should not only look at the agency’s experience,but also check whether it has policy response capability and destination port resources for specific markets.If you have demand for exporting to Southeast Asia,you can contact Zhongshen’s dedicated specialist to get your customized customs brokerage and export document solution.

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