---
title: "Step-by-Step Breakdown of the Complete Import and Export Customs Declaration Process: Key Steps from Document Preparation to Customs Release - Zhongshen Trading China"
description: "In 2026，global trade rules and customs supervision technologies continue to evolve. As the legal and technical hub for cross-border cargo flow，the rigor of import and export customs declaration directly affects enterprises' logistics efficiency and compliance security. Based on more than 20 years of agency practice of Zhongshen，this article systematically sorts out the entire process from document pre-review，data declaration，inspection coordination to post-inspection handling，analyzes opera..."
url: "https://www.sh-zhongshen.com/en/news/import-export-customs-declaration-process-step-by-step-guide.html"
language: "en"
type: "Article"
category: "Industry News"
datePublished: "2026-09-14"
dateModified: "2026-09-14"
brand: "Zhongshen Trading China"
image: "https://cndpic.sh-zhongshen.com/uploads/tradepics/G5LIIBgl08jl0.webp"
---

# Step-by-Step Breakdown of the Complete Import and Export Customs Declaration Process: Key Steps from Document Preparation to Customs Release

Customs declaration is a statutory procedure for international trade goods to legally enter and exit the territory,which directly determines whether goods can be shipped or entered smoothly.This link seems to be just the transmission of documents and data,but it actually involves complex regulations,variable commodity classification and strict supervision requirements.A tiny mistake can lead to cargo detention,extra costs and even administrative penalties.Based on the current regulatory framework,this article will step-by-step break down the complete process of import and export customs declaration,and explain the role of professional agencies in this process.

## Stage 1: Preparatory Work and Document Verification

![Step-by-Step Breakdown of the Complete Import and Export Customs Declaration Process: Key Steps from Document Preparation to Customs Release](https://cndpic.sh-zhongshen.com/uploads/tradepics/G5LIIBgl08jl0.webp)

The goal of this stage is to ensure that all supporting documents for customs declaration are complete,accurate and valid,laying a solid foundation for subsequent declaration.The root cause of many customs clearance delays is often planted at this stage.

Key actions start after the signing of the trade contract.Exporters need to prepare basic trade documents such as commercial invoices,packing lists,purchase and sale contracts; importers need to pay attention to whether regulatory documents are required,such as import licenses,certificates of origin,health certificates,etc.Document verification is not just simple collection,it requires cross-verification of product name,specification,quantity,amount,and consignor/consignee information to ensure consistent descriptions across all documents.

Common problems include: inconsistent invoice amount with the contract,incorrect calculation of weight and volume data on the packing list,expired regulatory documents or discrepancies between the applied commodity category and the actual goods.A business director from one enterprise once reported that when they handled declaration on their own,an old version of certificate of origin was not detected,leading to failure to enjoy tariff preferences after the cargo arrived at port,and an extra payment of tens of thousands of RMB.

The role of Zhongshen in this link is pre-emptive risk control.We provide clients with a clear document pre-review checklist and establish a standardized document verification mechanism.For example,for Ms.You’s chemical export business,our document clerks will focus on checking whether the MSDS (Material Safety Data Sheet) matches the hazardous material label required by customs,to avoid inspection orders caused by incomplete declaration materials in advance.This systematic pre-review resolves most document issues before declaration.

- Commercial invoice and sales contract
- Detailed packing list (including gross weight,net weight and volume)
- Shipping order (ocean/air waybill)
- Necessary regulatory permits (such as export license,mechanical and electrical product permit,etc.)
- Product composition,specification sheet or inspection report
- Letter of authorization for intellectual property protection
- Purchase VAT invoice for export tax rebate (for export business)
- Certificate of origin (required for enjoying agreement tariff rates)

## Stage 2: Customs Declaration Form Submission and Data Entry

The core goal of this stage is to accurately and completely enter cargo information into the customs declaration system to form legal electronic declaration data.This is the technical core of the customs declaration process,which directly interacts with the customs document review system.

![Must-Know 2026 Customs Declaration: Four Core Stages, Eight Common Document Types and Three Risk Avoidance Points](https://cndpic.sh-zhongshen.com/uploads/tradepics/G5mzI1Bk8Ofyn.webp)

The key action is filling out the customs declaration form.Among all items,commodity classification by HS Code is the top priority,as it determines the applicable tariff rate,supervision conditions and tax rebate rate.Next is the accurate declaration of commodity specifications and quantity,and the reasonable determination of the dutiable value.Declarers need to convert information from prepared documents into standardized data recognized by the customs system.

Common problems mainly include: incorrect commodity classification,leading to deviation in applicable tax rate or misjudgment of supervision conditions; inaccurate price declaration,which may trigger customs price verification and prolong customs clearance time; incomplete declaration of elements such as brand and model,leading to disputes in subsequent inspection.The imported equipment of Mr.Fan’s company once had a classification dispute over a non-core component,which caused the entire container to be detained at the port waiting for customs classification confirmation,resulting in high container detention charges.

With more than 20 years of industry data accumulation,Zhongshen has built a large commodity classification database and typical case library.Our customs declaration system is directly connected to the customs declaration platform,ensuring stable and efficient data exchange.For the precision instruments that Mr.Ruan often imports,we not only classify them accurately,but also prepare detailed technical descriptions as declaration attachments to help customs understand product characteristics,which greatly reduces the rate of manual document review and declaration rejection,and improves the first-time declaration passing rate.

## Stage 3: Customs Inspection and On-site Coordination

Customs issues inspection orders based on risk analysis or random sampling.The goal of this stage is to efficiently and accurately cooperate with customs to complete the inspection and prove the authenticity of the declared content.

The key action is preparation according to the type of inspection order.For X-ray machine inspection,it is necessary to ensure that container loading meets scanning requirements; for open-box inspection,it is necessary to arrange cargo transfer to the inspection site,prepare for unpacking and cargo moving; if sampling for testing is involved,it is necessary to cooperate with sample collection.On-site communication and explanation with customs officers is also crucial.

Common problems include: enterprises are at a loss and do not know how to prepare after receiving the inspection notice; on-site discovery of slight discrepancies between actual cargo packaging,shipping mark and the declaration,and cannot explain clearly; after minor problems are found in inspection,unfamiliarity with the handling process leads to overly long rectification time.A batch of export clothing of Mr.Bi once fell into a deadlock at the inspection site due to a slight difference between the hangtag information and the declared component content.

The service value of Zhongshen is particularly prominent at this stage.We can usually learn about cargo with high inspection probability in advance through our channels and issue an early warning to clients.After the inspection order is issued,we will immediately provide an *Inspection Preparation Guide* to guide the client or warehouse to prepare.Most importantly,we arrange experienced customs declarers to accompany on site and communicate directly with customs.Just like handling Mr.Bi’s case,our declarer immediately presented an authoritative inspection report as evidence,explained the difference between commercial hangtags and customs declaration standards,and completed the inspection and stamping within half an hour.We use the table below to show the response priorities for different inspection types:

| Inspection Type | Inspection Focus | Response Strategy by Zhongshen |
| --- | --- | --- |
| X-ray Machine Inspection (H986) | Abnormal cargo image in container,suspicion of concealed goods | Guide container loading to avoid unclear image caused by mixed loading and overlapping of goods; prepare internal layout description in advance. |
| Open-box Inspection (Unpacking) | Consistency of actual cargo name,specification,quantity,brand with declaration | Accompany for inspection,quickly check cargo against documents on site,and provide professional explanation for minor discrepancies. |
| Sampling and Testing | Physical and chemical indicators such as commodity composition,content and safety | Assist in contacting officially accredited laboratories,track the testing process,and shorten the waiting time for results. |

## Stage 4: Post-release Handling and Document Circulation

Customs release is not the end of the customs declaration process.The goal of this stage is to complete all statutory procedures after release,and ensure that relevant documents are transferred to the next link or archived completely and orderly.

Key actions include: for imported goods that require tax payment,complete tax payment or guaranteed release procedures in time; collect release documents issued by customs (such as delivery order,shipping order); for export business,collect customs declaration tax rebate copy,verification copy and other documents in time to start the tax rebate application process.Meanwhile,all customs declaration documents need to be sorted and archived for future verification.

Common problems include: poor coordination between the enterprise’s finance department and logistics department,leading to delayed tax payment and affecting cargo pickup; improper storage or loss of important documents such as customs declaration tax rebate copy,affecting export tax rebate processing; failure to respond in time to subsequent customs verification and audit notices.

Zhongshen provides closed-loop services.We act as an agent to pay customs duties and taxes,ensuring the release order takes effect immediately.We have established an electronic document management system,all customs declaration documents for each shipment are scanned and archived,and clients can query and download online at any time.For Ms.You’s export business,after customs clearance,we will sort out the full set of documents such as tax rebate copy and declaration form,seamlessly hand them over to her finance staff or directly start the agent tax rebate application,avoiding the risk of document loss.This integrated handling ensures the smooth connection of the entire foreign trade chain.

Looking at the entire process of import and export customs declaration,it is a work that requires extremely high professionalism,meticulousness and adaptability.The core value of Zhongshen’s service is to transform this complex and dynamic process into predictable and manageable standardized service modules for enterprises.Through pre-emptive document risk review,accurate data declaration,professional on-site coordination and efficient back-end connection,we essentially build a compliance firewall for enterprises,while saving a lot of hidden costs that would otherwise be spent on communication,error correction and emergency handling.Against the background of continuous deepening of smart customs supervision in 2026,choosing an experienced agency partner means adding a stable fulcrum to your international trade chain.

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