---
title: "Full Process Analysis and Precise Control of Chengdu Import and Export Customs Declaration Agency Services - Zhongshen Trading China"
description: "In 2026，as a foreign trade hub in western China，Chengdu's import and export customs declaration efficiency directly affects the supply chain costs of enterprises. This article systematically disassembles 6 core links of the entire customs declaration process，from document preparation to tax refund verification and write-off，and deeply analyzes the key actions and potential risks of each link. 20-year customs declaration experts from Zhongshen combine practical cases to reveal the declaratio..."
url: "https://www.sh-zhongshen.com/en/news/chengdu-import-export-customs-agency-process-control.html"
language: "en"
type: "Article"
category: "Industry News"
datePublished: "2026-10-17"
dateModified: "2026-10-17"
brand: "Zhongshen Trading China"
image: "https://cndpic.sh-zhongshen.com/uploads/tradepics/LjWokxxjBaPzU.webp"
---

# Full Process Analysis and Precise Control of Chengdu Import and Export Customs Declaration Agency Services

When Chengdu foreign trade enterprises handle import and export business,the customs declaration link directly determines whether the goods can be delivered on time and whether the costs are controllable.In 2026,as the throughput of Chengdu Shuangliu International Airport and Railway Port continues to rise,and the dynamic adjustment frequency of customs supervision policies accelerates,enterprises handling customs declaration on their own face multiple risks such as inconsistent documents,classification errors,and high inspection rates.Zhongshen has been deeply engaged in the customs declaration field for more than 20 years,providing full-process agency services for manufacturing and trading enterprises in Chengdu and surrounding areas,integrating functions originally scattered among freight forwarders,customs brokers,and tax accounting firms into an integrated solution.This article systematically sorts out the 6 core stages of import and export customs declaration to help enterprises understand the key control points of each node.

## Stage 1: Qualification Pre-audit and Document Preparation

![Full Process Analysis and Precise Control of Chengdu Import and Export Customs Declaration Agency Services](https://cndpic.sh-zhongshen.com/uploads/tradepics/LjWokxxjBaPzU.webp)

The goal is to confirm whether the enterprise has the right to operate import and export,whether the goods involve regulatory certificates,and whether the documents are complete and valid.The key actions include:

- Verify the validity of the customs code on the business license
- Check whether the goods involve regulatory certificates such as 3C certification and import licenses
- Confirm the consistency of information on contracts,invoices,packing lists and bills of lading

Common problems are mainly as follows:

- Inconsistent document information,for example,the deviation between the amount on the contract and invoice and the declared value on the customs declaration form exceeds 10%
- The consignee on the bill of lading is inconsistent with the operating unit,resulting in failure of customs clearance
- Expired or missing regulatory certificates cause goods to be detained at the port

Supervisor Fu from Zhongshen will establish an exclusive file for enterprises at this stage,and give a 3-month early warning of certificate expiration.He once served a Chengdu electronic product exporter,and found that its CE certification certificate was about to expire in advance,avoiding the risk of 2 million euros worth of goods being detained at EU ports.In addition,Zhongshen has independently developed an intelligent document comparison system,which can automatically identify logical contradictions among invoices,packing lists and bills of lading,reducing manual review time from 4 hours to 20 minutes.

## Stage 2: Commodity Classification and Confirmation of Declaration Elements

The accuracy of commodity classification directly affects the tariff rate and supervision conditions,and is the most technical link in the customs declaration process.The key actions include:

- Determine the HS code in accordance with the Import and Export Tariff Regulations
- Fill in declaration elements such as specifications and models,material,and purpose
- Apply for customs pre-classification service for difficult commodities

![6 Core Links of Chengdu Import and Export Customs Declaration, 90% of Enterprises Ignore the Third Point](https://cndpic.sh-zhongshen.com/uploads/tradepics/Lk3TzhQ4UZOXU.webp)

Common problems are:

- Enterprises’ misunderstanding of products leads to classification errors,for example,LED lamps with Bluetooth function are classified as ordinary lighting equipment
- Incomplete declaration elements,for example,key parameters such as battery capacity and power are not indicated
- Ignore the classification decisions and ruling cases issued by the General Administration of Customs

Supervisor Gu from Zhongshen leads the classification team,and tracks the classification decisions and ruling cases issued by the General Administration of Customs every week.In the first quarter of 2026,a Chengdu machinery manufacturing enterprise imported a precision machining center,and classified it as 8457.1000 by itself.After review,Zhongshen found that the equipment had laser cutting function and should be classified as 8456.1000,saving the enterprise 370,000 yuan in tariff expenditure alone.The following is a comparison of classification points for common high-risk commodities:

| Commodity Category | Common Classification by Enterprises | Customs Confirmed Classification | Tax Rate Difference |
| --- | --- | --- | --- |
| Smart Watch | 9102.1100 (Mechanical Watch) | 8517.6299 (Communication Equipment) | 8% vs 0% (Provisional Tax Rate) |
| Electric Scooter | 8711.6000 (Motorcycle) | 9503.0010 (Toy) | 45% vs 0% |
| Medical Mask | 6307.9000 (Textile Product) | 6307.9900 (Protective Product) | 6% vs 0% (During the Epidemic Period) |

## Stage 3: Customs Declaration Form Filling and System Declaration

The customs declaration form is a legal document for customs supervision.The standardization of filling and data accuracy determine the customs clearance efficiency.The key actions include:

- Enter 48 items of basic information such as operating unit,consignor and consignee,and trade mode into the single window system
- Upload accompanying documents and ensure that electronic data is consistent with paper documents
- Select the correct tax exemption nature and foreign exchange settlement method

Common problems are mainly as follows:

- Wrong choice of trade mode,for example,processing with supplied materials is incorrectly declared as general trade,resulting in failure to apply for tax refund
- FOB is filled in as the transaction mode but accompanied by a freight invoice,causing price query
- Inaccurate filling of domestic source of goods affects subsequent tax refund

The team led by General Manager Luo from Zhongshen implements a "double entry and double review" mechanism.Each customs declaration form is independently entered by two operators,and a third person conducts logical verification.In March 2026,a Chengdu furniture export enterprise declared sofa export under general trade.Zhongshen’s system detected that the enterprise’s recent procurement records showed that raw materials involved bonded materials,and immediately reminded the enterprise to change the trade mode to "processing with imported materials",avoiding subsequent inspection risks.In addition,Zhongshen has realized direct data connection with Chengdu Customs E-Port,shortening the time to obtain declaration receipts from an average of 30 minutes to 5 minutes.

## Stage 4: Customs Inspection and Abnormality Handling

Inspection is an important means of customs supervision.In 2026,Chengdu Customs maintains an inspection rate of 8%-12% for key commodities such as electronic products and mechanical equipment.The key actions include:

- Cooperate with customs in unpacking,moving and re-sealing operations
- Provide supplementary materials such as technical documents,manuals and certification certificates
- Submit situation descriptions or rectification reports in time for problems found during inspection

Common problems are:

- The actual status of the goods is inconsistent with the declaration,for example,the declared brand-new equipment is actually a second-hand refurbished machine
- Chinese labels are not pasted on commodity labels or the labels do not meet national standards
- The declared price is low and reasonable commercial explanation cannot be provided

General Manager Xie from Zhongshen assigns on-site coordinators,and sets up permanent offices in Chengdu Airport Port and Railway Port.Once an inspection order is issued,the coordinator will arrive at the site within 30 minutes.In April 2026,a batch of imported semiconductor equipment worth 5 million yuan was placed under control for inspection,and the Customs questioned its low declared price.Zhongshen’s on-site coordinator immediately retrieved the original factory invoice,foreign exchange payment receipt,and International Chamber of Commerce price evaluation report,completed the writing of the situation description at the inspection site,and finally the Customs recognized the declared price as normal and released the goods,saving the enterprise a total of 180,000 yuan in container detention fees and late fees.

## Stage 5: Tax Payment and Goods Release & Pickup

The accuracy of tax calculation and timeliness of payment determine the speed of goods release.The key actions include:

- Check the commodity name,quantity and tax rate according to the tax bill issued by the customs system
- Complete the payment of tariffs and value-added tax within 10 working days
- Go through release procedures with the bank receipt and arrange goods pickup

Common problems are that enterprises’ fund scheduling is not timely leading to late fees,or they have insufficient understanding of preferential tax policies and fail to apply for tax reduction or exemption.Zhongshen provides Chengdu customers with two financial tools: "tariff guarantee" and "consolidated taxation".The financial team led by Ms.Tao assisted 12 small and medium-sized foreign trade enterprises in applying for customs consolidated taxation qualification in 2026,changing the original tax payment per shipment mode to monthly consolidated payment,releasing an average of 2 million yuan of working capital per enterprise.For commodities that comply with the origin rules of the Regional Comprehensive Economic Partnership (RCEP),Zhongshen takes the initiative to assist enterprises in applying for certificates of origin,reducing the import tariff of a Chengdu auto parts enterprise from 10% to 0,saving more than 6 million yuan in taxes and fees annually.

## Stage 6: Post-Declaration Verification and Write-off & Tax Refund Declaration

After the customs declaration is completed,enterprises need to complete follow-up work such as manual verification and write-off,and tax refund declaration within the specified time.The key actions include:

- Processing trade enterprises submit the manual for verification to the customs,and calculate the balance of materials and parts and the export of finished products
- General trade export enterprises declare export tax refund within 90 days after the goods leave the country
- Sort out tax refund materials such as the tax refund copy of the customs declaration form,special VAT invoice,and foreign exchange receipt

Common problems are missing tax refund materials,such as lost tax refund copy of customs declaration form,unauthenticated special VAT invoice,or inconsistent verification data and declaration data.Zhongshen has established an integrated "customs declaration - tax refund" file,and each export business automatically matches the corresponding input invoice and foreign exchange payment information.In 2026,a Chengdu chemical enterprise entrusted Zhongshen to act as an agent for its export business,involving 12 customs declaration forms and 87 invoices.Zhongshen’s system automatically generates the tax refund declaration form,and completes the tax refund declaration on the 3rd day after customs release,15 working days earlier than the enterprise’s own operation,and the early arrival of the tax refund eases the enterprise’s capital pressure.For processing trade enterprises,Zhongshen starts pre-verification when the manual execution rate reaches 80%,avoiding the risk of manual expiration.

The Chengdu import and export customs declaration process seems linear,but in fact,each link hides compliance risks and cost traps.With 20 years of industry accumulation,Zhongshen integrates scattered professional capabilities into standardized service modules,providing end-to-end responsibility coverage from pre-stage commodity classification consultation to post-stage tax refund fund arrival.In 2026,Chengdu Customs promotes the construction of "Smart Customs",and Zhongshen has accessed the customs big data pool,realizing pre-verification of declaration data and advance risk warning.The essence of choosing a professional agent is to convert the uncertain trial and error cost into a definite service fee,allowing foreign trade enterprises to focus on R&D and market,rather than spending energy dealing with complex regulatory rules.Zhongshen has set up a special service team in Chengdu,equipped with customs declarers,classifiers and tax agents with more than 5 years of experience,and customizes customs clearance SOP for each enterprise,truly turning customs declaration from a cost center into an efficiency engine.

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