As one of the most core and busiest routes in global cross-border trade, sea shipping from China to the US carries most of the cargo exchanges between China and the US. However, in the process of cargo clearance, customs inspection is a common challenge faced by freight forwarders and foreign trade enterprises. Once an inspection is encountered, it may not only delay the timeline but also incur additional costs, and even affect the normal clearance of goods. This article will detail the complete guide for customs inspection in sea shipping from China to the US, covering inspection reasons, processes, response methods, cost control, and risk avoidance, helping practitioners respond efficiently and reduce losses.

What Is the Core Purpose of US Customs Inspection? Why Is Sea Shipping from China to the US Prone to Inspection?

The core purpose of the US Customs and Border Protection (CBP) inspecting imported goods is to ensure national security, prevent illegal items from entering the country, protect intellectual property rights, and verify the authenticity of cargo declaration information to eliminate tax evasion, smuggling, and other irregular behaviors. Many freight forwarders have a misunderstanding that "inspection is only aimed at Chinese goods". In fact, the inspection rate is affected by many factors, and sea shipping goods from China to the US are prone to inspection mainly due to three core reasons.

According to the CBP Fast Doc Review Special Report (April 2026, latest data), a total of 4,128 Chinese export containers triggered 5H inspections across the US in April 2026, accounting for 10.3% of the total number of Chinese export containers to the US—an increase of 28% compared with March. Among them, the ports of Los Angeles/Long Beach, Seattle/Tacoma, and New York/New Jersey are key inspection areas, with inspection rates as high as 33.7%, 20.1%, and 12.8% respectively, all of which have increased to varying degrees compared with February’s data.

Freight forwarders need to note that the key factors making sea shipping goods from China to the US prone to inspection include: first, the concentration of cargo categories. China’s export advantage categories, such as furniture and home furnishings (21%), 3C electronics (18%), and textiles and clothing (15%), have become high-risk inspection categories because they are prone to intellectual property infringement, counterfeiting, and shoddy issues. Second, non-standard declaration information. Many freight forwarders or enterprises cut costs by providing low declared values, incorrect HS code classifications, or vague cargo descriptions, which directly trigger customs risk warnings. Third, the upgrading of CBP compliance rectification. In 2026, CBP launched a long-term compliance rectification campaign that will last until the end of the year, aiming to raise the compliance rate of Chinese exports to the US to over 90%, with stricter inspection standards than in previous years.

A common misunderstanding is that some freight forwarders believe "as long as the goods are compliant, they will not be inspected". In fact, US Customs uses a risk assessment system (ACE System). In addition to irregular goods, random inspections are also an important form of inspection. According to public data from US Customs (CBP) in April 2026, the random inspection rate for sea shipping goods from China to the US is approximately 2.5% to 5.5%. Even if goods are fully compliant, they may still be randomly inspected.

What Are the Common Types of Customs Inspection for Sea Shipping from China to the US? What Is the Process?

Understanding the types and processes of inspections is fundamental to responding to them efficiently. Freight forwarders need to clarify that US customs inspection is not a single form—different types of inspections vary significantly in process, duration, and cost, requiring targeted responses.

3 Common Types of Inspection That Freight Forwarders Need to Focus on Distinguishing

1.  Document Inspection: The most basic and common type of inspection, mainly verifying the consistency and authenticity of documents such as bills of lading, commercial invoices, packing lists, ISF declaration documents, and certificates of origin to confirm whether the declared information matches the actual condition of the goods. This type of inspection takes a short time, usually 1–2 working days to complete, with no additional inspection fees—only cooperation in providing relevant documents is required.

2.  Physical Inspection: Customs personnel open containers to inspect goods, verifying whether the name, quantity, specification, packaging, etc., of the goods match the declared information, while also checking for contraband, infringing goods, etc. This type of inspection takes a long time (usually 3–7 working days) and incurs additional costs such as unpacking fees and storage fees, making it the most critical type of inspection for freight forwarders to address.

3.  Targeted Inspection: Specialized inspections for specific categories, enterprises, or risk points, such as 5H inspections, intellectual property inspections, and anti-dumping inspections. According to the latest CBP data in April 2026, 85% of containers subject to 5H inspections were forced to be returned, with an average return cycle of 29 days—an 86% increase compared with the same period last year—having the greatest impact on freight forwarders and enterprises.

Standard Process of Customs Inspection: Not a Single Step Can Be Missed

The recommended approach is: freight forwarders need to be familiar with the entire inspection process and make preparations in advance to avoid delays due to unfamiliarity. The standard process for customs inspection in sea shipping from China to the US is mainly divided into 5 steps:

Step 1: After the goods arrive at the port, the CBP system conducts a risk assessment and marks the inspection level (low risk, medium risk, high risk). High-risk goods directly trigger inspections, while low-risk goods may be randomly inspected.Step 2: Customs issues an inspection notice, which is received by the freight forwarder or customs broker, specifying the inspection type, time, and required documents.Step 3: The freight forwarder cooperates with the customs broker to prepare relevant documents. For physical inspections, coordination with the warehouse is required to arrange unpacking.Step 4: Customs completes the inspection. If no abnormalities are found, an inspection release notice is issued; if abnormalities are found, an inspection exception report is issued, requiring supplementary information or handling of irregular issues.Step 5: The goods are released and enter the subsequent distribution link.Freight forwarders need to note that the timeliness and accuracy of document preparation are crucial throughout the inspection process. Missing or incorrect documents will significantly extend inspection time and increase additional costs.

How Should Freight Forwarders Efficiently Respond When Encountering Customs Inspection? What Are the Key Steps?

When facing customs inspection, many freight forwarders panic, either blindly urging customs or missing key information, which only leads to further delays. The recommended approach is: remain calm, proceed step by step, and focus on three core tasks—"document preparation, communication and coordination, and problem handling"—to minimize inspection time and reduce losses.

Step 1: Quickly Verify Documents to Ensure No Omissions or Errors

Documents are the core of inspections. Once documents have issues, the inspection will stall. Freight forwarders need to immediately verify all customs clearance documents, including bills of lading, commercial invoices, packing lists, ISF declarations, HS code certificates, and certificates of origin, focusing on three key points: first, the declared information matches the actual goods (including name, quantity, specification, declared value, HS code, etc.); second, documents are fully signed and sealed with no modification marks; third, information is consistent across documents (e.g., consignee information on the bill of lading matches the commercial invoice, and cargo details on the packing list match the declaration form).

A common misunderstanding is that some freight forwarders believe "the lower the declared value, the more customs duties can be saved, and the less likely an inspection will be". On the contrary, a declared value that is excessively low and significantly inconsistent with market prices will directly trigger a customs risk warning and lead to a physical inspection. According to an industry report released by the Shanghai Shipping Exchange in April 2026 (latest data), inspections caused by abnormal declared values account for 39% of the total number of inspections in sea shipping from China to the US, making it the most common cause of irregular inspections.

Step 2: Proactively Communicate and Coordinate, and Follow Up on Inspection Progress Timely

Freight forwarders need to proactively communicate with customs brokers and US Customs to stay updated on inspection progress and avoid delays due to information gaps. On one hand, urge the customs broker to submit required documents to customs promptly and cooperate in explaining any questions customs may have. On the other hand, for physical inspections, coordinate with the warehouse to prepare for unpacking, ensuring customs personnel can complete the inspection smoothly and avoiding delays due to improper warehouse cooperation.

Freight forwarders need to note that communication should be professional and patient, and arguments with customs personnel should be avoided. If there are objections to the inspection results, appeal materials can be submitted through the customs broker to safeguard legitimate rights and interests in accordance with the law. At the same time, timely feedback the inspection progress to the customer, explain potential delays and additional costs, and seek the customer’s understanding.

Step 3: Address Inspection Abnormalities Targetedly to Reduce Losses

If abnormalities are found during the inspection, freight forwarders need to address them targetedly based on the specific situation to avoid expanding losses. Common abnormalities and handling methods are as follows:

1.  Declared information inconsistent with goods: For example, incorrect HS code classification, inaccurate name description, or inconsistent quantity. Immediately supplement correct declaration materials and explain the situation to customs. If the circumstances are minor, customs will allow modifying the declaration information, and a small fine may be incurred later; if the circumstances are serious, it may be deemed false declaration, resulting in high fines or even cargo detention.

2.  Discovery of contraband or infringing goods: This is a serious situation. Freight forwarders must immediately cooperate with customs to address it. If the quantity of contraband is small, an application for destruction or return can be made; if infringement is involved, relevant authorization certificates must be provided, otherwise the goods will be confiscated and high fines will be imposed. Freight forwarders need to note that when undertaking sea shipping business from China to the US, they must verify in advance whether goods are contraband or involve infringement and refuse to handle irregular goods.

3.  Goods packaging not meeting requirements: For example, damaged packaging, unclear labels, or failure to meet US customs packaging standards. Timely coordinate with the warehouse to repackage and supplement labels—customs will only release the goods once they meet the requirements.

What Are the Additional Costs Caused by Inspections? How to Effectively Control Them?

Encountering customs inspection in sea shipping from China to the US will inevitably incur additional costs, which are mainly borne by the freight forwarder or enterprise. If not properly controlled, these costs will significantly reduce profit margins. According to the April 2026 operation report (latest data) from shipping companies such as Matson and ZIM, inspections can cause goods to be delayed for 5–23 days, with additional costs increasing by 19.2%–48%. Costs vary significantly by route and inspection type.

4 Common Types of Additional Costs That Freight Forwarders Need to Anticipate

1.  Inspection Fee: Charged by customs or inspection agencies. Fees range from $500 to $2,000 depending on the inspection type—physical inspections cost more than document inspections, and targeted inspections are the most expensive.

2.  Storage Fee: During the inspection period, goods must be stored in port warehouses or customs-designated warehouses, with daily storage fees usually ranging from $50 to $200. The longer the inspection, the higher the storage fee.

3.  Demurrage Fee: If the inspection prevents containers from being returned on time, the shipping company will charge a demurrage fee of $20–$100 per day. If demurrage exceeds 7 days, the fee will double.

4.  Other Fees: Including unpacking fees, tally fees, document supplementary fees, and trailer delay fees. In total, the additional cost of a single physical inspection is usually $1,000–$3,000.

3 Practical Methods to Control Additional Inspection Costs

The recommended approach is: freight forwarders need to proactively avoid risks, reduce the probability of inspections at the source, and optimize processes to shorten inspection time, thereby controlling additional costs.

1.  Standardize Declarations to Reduce Inspection Probability: Declare strictly in accordance with the actual condition of goods, ensuring declared information is true, accurate, and complete. Avoid issues such as abnormal declared values, incorrect HS codes, or vague names. For high-risk categories, prepare relevant certification documents (e.g., intellectual property authorization certificates, certificates of origin) in advance and proactively explain the situation to customs to reduce inspection risks.

2.  Choose a High-Quality Customs Broker to Improve Inspection Efficiency: A high-quality customs broker is familiar with US customs inspection rules, communicates smoothly with customs, can quickly resolve issues during inspections, and shorten inspection time. According to the latest data from the Shanghai Shipping Exchange in the second quarter of 2026, choosing a high-quality customs broker can reduce inspection time by an average of 2–3 days and lower additional costs by approximately 32%.

3.  Purchase Relevant Insurance in Advance to Transfer Risks: For inspection risks in sea shipping from China to the US, purchase customs clearance delay insurance, cargo detention insurance, etc. If delays or losses occur due to inspections, partial compensation can be obtained through insurance to reduce personal losses.

How to Avoid Customs Inspection Risks in Sea Shipping from China to the US in Advance?

The best way to handle inspections is to avoid risks in advance. Freight forwarders need to establish a sound risk control mechanism and minimize inspection probabilities across all links, including business undertaking, declaration, and document preparation.

4 Core Points to Avoid Inspection Risks

Freight forwarders need to note that the following 4 points are core to avoiding inspection risks and must be strictly implemented:

1.  Strictly Review Customer and Cargo Qualifications: When undertaking sea shipping business from China to the US, review the customer’s business license and import/export qualifications, and confirm whether the customer has any irregular records. At the same time, fully understand the cargo situation, clarify whether goods are contraband, involve infringement, or meet US customs regulations, and refuse to handle irregular goods.

2.  Standardize the Declaration Process and Establish a Double Review Mechanism: Arrange professional personnel to be responsible for cargo declaration. Before declaration, conduct a double review of declaration information, HS codes, and documents to ensure no errors or omissions. For declared values, refer to market prices to avoid over-declaration or under-declaration. If the cargo value is high, provide relevant value certification documents.

3.  Stay Familiar with the Latest US Customs Policies and Adjust Operations Timely: US customs policies are constantly updated. For example, the supplementary requirement of "detailed declaration of cargo value" added in April 2026 clearly requires declaring values item by item according to cargo details, marking the unit price and total price of each category—general total value declarations are not allowed. Freight forwarders need to regularly organize employees to learn the latest US customs policies, pay attention to industry trends, and adjust operational processes timely to avoid irregular inspections due to policy unfamiliarity.

4.  Strengthen Communication and Cooperation with All Parties: Maintain close communication with customers, customs brokers, and shipping companies to timely obtain cargo information, declaration information, and policy information. Anticipate potential issues in advance and make response preparations. For example, communicate with the shipping company to confirm the ship’s arrival time, prepare customs clearance documents in advance, and avoid delays in cargo clearance due to late document preparation, which increases inspection risks.

Conclusion

In summary, encountering customs inspection in sea shipping from China to the US is not daunting. The key lies in whether freight forwarders are familiar with inspection rules, master response methods, and avoid risks in advance. Freight forwarders must abandon the "luck mentality", strictly standardize operations, and do a good job in every link. They must not only ensure the authenticity and accuracy of declaration information but also prepare for post-inspection responses to minimize inspection time and reduce additional costs. With the continuous development of China-US trade and the increasing stringency of US customs compliance requirements, only by continuously improving professional capabilities can freight forwarders calmly address the challenges of customs inspection, provide customers with more efficient and compliant sea shipping services from China to the US, and gain an advantage in the fierce market competition.