What Is Customs Clearance? How It Impacts Ecommerce Shipping

Customs clearance is the process by which a government’s customs authority reviews, approves, and releases shipments crossing international borders. Every commercial package that enters or exits a country must pass through this process before it can reach its final destination. For ecommerce brands shipping internationally, customs clearance is not a background formality that happens automatically. In international shipping, clearing customs is required for all cross-border ecommerce shipments to ensure legal entry or exit of goods. Customs clearance is a necessary procedure before goods can be imported or exported internationally. It is one of the most common sources of delivery delays, unexpected fees, and failed shipments.

Understanding how customs clearance works, what can go wrong, and what documentation controls the outcome is essential for any brand serving international customers. A shipment that clears customs smoothly in one to two business days looks very different from one held for a week pending document review. Shipment delays are a frequent result of customs clearance issues, such as incomplete paperwork or required inspections.

How Customs Clearance Works

When a shipment crosses an international border, customs authorities in the importing country—acting as the government agency responsible for customs procedures and customs processing—review the shipment’s customs documentation, verify that the contents comply with import regulations, assess any applicable customs duties and taxes, and either release the shipment for delivery or hold it pending further information.

The process follows a general sequence across most countries, though specific requirements vary by destination:

The carrier or freight forwarder submits the shipment’s documentation to customs before or upon the package’s arrival at the border. Import customs clearance involves submitting customs documentation, including a completed customs declaration, which is usually filed electronically and must include details such as the nature, quantity, value, origin, and intended use of the goods. Customs officials review the commercial invoice, the customs declaration form, bill of lading, packing list, and any additional permits or certificates required for that product category or country. Successful customs clearance requires all these documents to be completed accurately. Based on the declared contents, value, and country of origin, customs assesses the applicable import duties and taxes using the Harmonized System code assigned to the product. Most shipments that cross international borders are subject to duty and tax assessment by the importing country’s government, and customs charges are calculated based on the HS code, country of origin, type of good, and declared value, including shipping and insurance. Customs duties and taxes can be paid by either the buyer or seller, but in commercial shipping, it is almost always the importer who pays these charges. If duties apply, they must be paid before the shipment is released. Once taxes and duties are paid, shipments are released from customs. Once all fees are settled and documentation is confirmed complete and accurate, the shipment receives clearance and continues to final delivery. When goods arrive in the US, the most common type of customs entry is a consumption entry, which must be filed with US Customs and Border Protection. Pre-arrival clearance paperwork can often be filed electronically to minimize delays.

For low-value shipments with complete and accurate documentation, this process can be completed in one to two business days. For shipments that are flagged for physical inspection, that contain restricted or regulated items, or that have incomplete or inaccurate paperwork, delays of three to seven days or longer are common. These are a major source of carrier shipment exceptions and delays that can disrupt delivery promises and increase support costs. In complex cases, customs or a government agency may request further information, and clearance can take weeks.

The Role of Documentation

Documentation is the single most controllable factor in customs clearance outcomes. Incomplete or inaccurate paperwork is the leading cause of customs delays across all carriers and shipping lanes. The documents most commonly required for international commercial shipments are collectively referred to as shipping documents, which are essential for verifying shipments, assessing duties, and ensuring compliance with trade regulations.

Commercial invoice. This is the foundational customs document. It must include a complete and specific description of every item in the shipment, the declared value of each item, the country of origin, the shipper’s and recipient’s full names and addresses, and the Harmonized System (HS) code for each product. Vague descriptions such as “parts” or “goods” create immediate problems because customs authorities cannot classify what they cannot identify. An invoice that says “cotton crew-neck t-shirt, 100% cotton, $22.00” clears faster than one that says “clothing item.” Attaching a shipping label to the package is also critical for customs clearance and delivery, as it ensures the shipment can be properly identified and processed.

Customs declaration form. This is a formal declaration submitted to the importing country’s customs authority. For parcel shipments, carriers typically generate this from the commercial invoice data. The accuracy of the declaration depends entirely on the accuracy of the data the shipper provides.

Packing list. This itemizes the contents of the shipment at a more detailed level than the commercial invoice, including quantities, weights, and packaging details. Customs officers use the packing list to verify that what is declared matches what is physically present.

Air waybill. For air freight shipments, the air waybill serves as the contract of carriage between the shipper and the airline. It contains details about the shipment, including the sender, recipient, and flight information, and is distinct from other documents like the bill of lading or commercial invoice.

Certificate of origin. For products where trade agreements provide preferential duty rates, or where import regulations require it, a certificate of origin documents where goods were manufactured. The country of origin is not the country the shipment is sent from. It is the country where the product was produced or substantially transformed. Confusing these two produces document errors that delay clearance. The certificate of origin often influences duty rates under trade agreements.

Additional permits or certificates. Products in regulated categories, including food, supplements, electronics, cosmetics, agricultural goods, and medical devices, may require import permits, health certificates, safety certifications, or regulatory approvals specific to the destination country. Missing these permits does not just cause a delay. It can result in the shipment being refused entry or destroyed.

Maintaining accurate documentation is essential, and importers must also keep entry records—including customs entry documents and transportation records—for several years to comply with customs regulations and to be prepared for potential audits or requests from authorities. Failure to provide these records can result in penalties, and many brands rely on ecommerce shipping software for warehouse automation to centralize data and reduce documentation errors.

Duties, Taxes, and Who Pays Them

When customs authorities assess a shipment, a tax assessment is performed as part of the customs clearance process. Taxes and duties—including customs duties—are applied based on the product’s HS code, declared value (including shipping and insurance), country of origin, and the trade relationship between the exporting and importing countries. Customs charges are calculated using these factors, and if the value of goods surpasses a tax bracket, customs will check to see if taxes and duties have been paid.

Import duties are tariffs applied by the destination country’s government to protect domestic industries or generate revenue. Duty rates vary significantly by product category and country. A product that enters one country duty-free may face a 15 percent tariff entering another.

VAT or goods and services tax applies in many countries on top of any customs duty. In the UK, for example, a 20 percent VAT applies to virtually all imported goods regardless of value. In the EU, VAT applies at each country’s standard rate.

Who pays these customs charges depends on the shipping terms agreed between buyer and seller. Under DDU (Delivered Duty Unpaid) terms, the recipient (consignee) is responsible for paying customs duties and taxes upon delivery. Under DDP (Delivered Duty Paid) terms, the seller (shipper) pre-pays all duties and taxes and collects them at checkout. Customs duties and taxes can be paid by either party, but in commercial shipping, it is almost always the importer who pays these charges. For ecommerce brands, the DDU model is operationally simpler on the seller’s side but creates a damaging customer experience: customers receive a notification that they must pay an unexpected amount before their package is released, and many refuse delivery. DDP removes that friction but requires the seller to register for VAT or use a service that handles the collection and remittance.

Once taxes and duties are paid, shipments are released from customs. Additionally, various fees—such as brokerage, storage, or late payment fees—may also apply during the customs clearance process, on top of carrier-specific add-ons like FedEx and UPS surcharges in 2025 that further increase landed costs.

What Causes Delays and What They Cost

The most common causes of customs clearance delays are documentation failures, and they are nearly all preventable. Shipment delays are a frequent consequence of customs clearance issues, impacting both delivery times and customer satisfaction.

Incomplete paperwork—such as incomplete or vague product descriptions on the commercial invoice—is the number one cause of customs holds. Incomplete paperwork is the most common reason for delays in customs clearance, and shipments can be held until all required information is received. When a customs official cannot determine what a product is, what it is made of, or how it will be used, they cannot classify it for duty assessment or verify it against import restrictions. The shipment stops until clarification is provided.

Incorrect or missing HS codes cause misclassification, which can result in incorrect duty assessment, delays while the correct classification is determined, or enforcement action if the misclassification is seen as intentional. Delays in customs clearance can also occur due to missing or incomplete documentation, incorrect HS codes, or insufficient packaging.

Undervalued or inaccurate declared values are flagged by customs systems that compare declared values against reference pricing databases. If the declared value is implausibly low for the product type, customs will either reject it or assess duties based on their own valuation, which may be higher than declared. In some jurisdictions, systematic undervaluation triggers penalties. Inaccurate information in documentation is the leading cause of delays in customs clearance.

Missing permits or certificates for regulated product categories stop a shipment entirely until the documentation is obtained and submitted. Delays can also occur due to delayed duty payments or non-compliance with customs regulations.

Physical inspections add unpredictable time regardless of documentation quality. Customs authorities in any country have the right to physically inspect any shipment, which may involve opening packages for security, verification, or permit compliance purposes. Routine physical inspections typically add one to three business days. Inspections that identify discrepancies or restricted items add significantly more, and may result in seizure. Physical inspections can cause further delays, especially if the documentation is not accurate or complete.

If customs or a government agency requires further information, packages may be held temporarily, resulting in additional delays and potential storage fees. Shipments can be held at customs until all required information is received, which can lead to significant delays.

To minimize delays, it is essential to provide accurate and complete documentation and ensure compliance with all customs requirements from the outset.

Customs clearance can take anywhere from a few hours to several days, depending on various factors including documentation completeness and inspections.

The financial cost of a customs delay accumulates quickly. Storage fees at customs facilities begin within days and grow over time. In the US, importers have 15 days from arrival to clear a shipment; beyond that, goods can be transferred to a general order warehouse at the importer’s expense. Expedited brokerage services to resolve holds carry their own fees. And if a perishable or time-sensitive product is held long enough to lose value, the financial loss extends beyond fees to the product itself.

For ecommerce brands, the customer experience cost compounds the financial one. A customer who ordered a product for delivery in five days and received a customs hold notification on day seven is not distinguishing between “carrier issue” and “seller issue.” It is your brand that owns the experience, which is why many merchants turn to specialized order fulfillment services for ecommerce companies to improve speed and reliability.

The Customs Broker’s Role

Customs brokerage is the service provided by licensed customs brokers, who are professionals or companies that assist individuals and businesses in importing goods and exporting goods across international borders. A customs broker acts as an intermediary between importers or exporters and customs authorities, including US Customs and Border Protection (CBP), border protection agencies, and other relevant authorities. In the US, customs brokers are licensed by Customs and Border Protection and play a key role in ensuring compliance with customs regulations, international trade laws, and documentation requirements.

Customs brokers help simplify the customs clearance process by ensuring the correct customs declaration is submitted and all necessary duties and taxes are paid. Their expertise helps avoid errors and minimize delays, making the process of importing goods more efficient. Complementary tools like ecommerce fulfillment software can further streamline operations by optimizing inventory placement and shipping decisions. Customs brokers also stay updated on ever-changing international shipping regulations to ensure ongoing compliance for shippers and recipients.

For commercial shipments above certain thresholds, a licensed customs broker is required for clearance in the US and many other countries. Brokers prepare and submit entry documentation, communicate with customs officials, pay duties and fees on behalf of importers, and resolve holds by providing additional information.

For ecommerce brands shipping at volume internationally, using a customs broker or working with a freight forwarder that includes brokerage services is standard practice. Attempting to manage customs entry documentation without brokerage expertise at any significant scale produces predictable errors and delays.

Most major carriers, including FedEx, UPS, and DHL, offer integrated brokerage services that are triggered automatically for international commercial shipments. Many ecommerce platforms connect to these carriers through order fulfillment integration and ecommerce partners that synchronize orders, rates, and labels. For brands using these carriers, the brokerage function is largely automated, but the documentation the brand provides at label creation still controls the outcome. The broker can only work with what the shipper provides. If the commercial invoice has vague descriptions, the broker cannot fix what was never there.

Country-Specific Regulations

When shipping internationally, understanding country-specific regulations is essential for a smooth customs clearance process. Every country enforces its own customs regulations, which dictate what goods can be imported, the required documentation, and how duties and taxes are assessed. These rules can vary widely, even for similar products, and are often updated to reflect changes in trade agreements or local laws.

For ecommerce brands exporting goods to multiple markets, staying informed about each destination’s clearance process is critical to avoid delays, unexpected costs, or even shipment refusals. For example, some countries may require additional permits for certain product categories, impose higher duties and taxes on specific goods, or have unique labeling and packaging requirements. Failing to comply with these local regulations can result in fines, confiscation of goods, or lengthy holds at customs.

A knowledgeable customs broker can be invaluable in navigating these complexities. Customs brokers are experts in interpreting and applying country-specific customs regulations, ensuring that all necessary documentation is prepared correctly and that shipments meet the importing country’s requirements. By leveraging their expertise, businesses can minimize the risk of clearance issues and avoid delays that could impact customer satisfaction.

To ensure compliance and streamline the customs clearance process, ecommerce brands should research the import regulations of each target market before exporting goods. This includes understanding applicable duties and taxes, required permits, and any product-specific restrictions. Proactively addressing these requirements—ideally with the support of a customs broker—helps avoid costly mistakes and keeps international shipments moving efficiently through customs.

What Ecommerce Brands Should Do Before Shipping Internationally

Before expanding to a new international market or increasing volume to an existing one, it is essential to plan ahead and understand trade regulations to ensure smooth customs clearance when you ship internationally. Ecommerce brands participating in global trade must ensure compliance with all customs clearance procedures to avoid delays and penalties. Customs clearance involves multiple steps, including verification of documentation and payment of duties.

The preparatory steps that prevent the most clearance problems are, and they become easier to execute consistently when you pair strong processes with scalable ecommerce order fulfillment software and networked order fulfillment services for ecommerce companies:

Classify all products with accurate HS codes for the destination country. The first six digits of an HS code are internationally standardized; digits beyond six are country-specific. Most shipping software platforms support HS code fields at the product level, and populating them before shipping is significantly faster than resolving misclassifications after the fact; solutions that include Amazon Buy Shipping integration for ecommerce order fulfillment can also help generate compliant labels and documentation automatically.

Research the destination country’s import restrictions and prohibited items for your product categories. What ships easily domestically may be regulated or prohibited in the destination market. Sellers leveraging programs like Amazon Buy with Prime for DTC customer experience must pay special attention to these rules, since customers expect Prime-like delivery even when customs adds complexity. Every international ocean freight shipment must meet the customs clearance requirements of each country involved.

Confirm documentation requirements for regulated product categories, including food, supplements, cosmetics, electronics, and children’s products, before the first shipment rather than after the first hold. At the same time, review packaging and dunnage choices—packaging that makes fulfillment easy can reduce damage risks and avoid inspections triggered by poorly protected or leaking goods. Key documents required for customs clearance include a commercial invoice, packing list, bill of lading, and certificate of origin.

Decide on a DDP or DDU model and communicate it explicitly at checkout. A customer who knows at purchase that they may owe local taxes upon delivery is in a fundamentally different position than a customer who discovers it for the first time when a courier calls.

Frequently Asked Questions

What is customs clearance?

Customs clearance is the process by which a country’s customs authority reviews a shipment, verifies it complies with import regulations, assesses any applicable duties and taxes, and releases it for final delivery. This process involves several customs procedures and customs processing steps, including inspections, documentation checks, and potential delays. Clearing customs requires a completed customs declaration, which is usually filed electronically. Every commercial shipment crossing an international border must complete this process.

How long does customs clearance take?

For shipments with complete and accurate documentation, customs processing time can vary, and shipment delays may occur depending on several factors. The duration of customs clearance can range from a few hours to several days, depending on the accuracy of documentation and whether inspections are required. Shipments flagged for inspection or with documentation problems can take three to seven days or longer. Incomplete or inaccurate paperwork is the most common reason for customs clearance delays, so providing accurate paperwork is essential to minimize delays. Complex cases, regulated products, or shipments missing permits can take weeks.

What documents are required for customs clearance?

The core shipping documents for most international shipments are the commercial invoice, customs declaration form, packing list, and bill of lading. For air freight shipments, an air waybill serves as a key document, acting as a contract of carriage and providing shipment details. Collectively, these are referred to as customs documentation, which must include information such as the nature, quantity, value, origin, and intended use of the goods being imported or exported. Depending on the product and destination country, additional documents such as a certificate of origin, import permits, health certificates, or safety certifications may be required.

What causes customs clearance delays?

The most common cause of shipment delays is incomplete paperwork, such as missing or vague product descriptions on the commercial invoice, incorrect or missing HS codes, inaccurate declared values, or missing permits for regulated products. Incomplete paperwork is the most frequent reason for delays in customs clearance, as customs authorities will hold shipments until all required documentation is provided. Physical inspections by customs officials can also cause delays, especially if the documentation is not accurate or complete. Additionally, if customs or a government agency requires further information, shipments may be held temporarily, resulting in additional delays and possible storage fees. Most documentation-related delays are preventable.

What is the difference between DDU and DDP shipping?

DDU (Delivered Duty Unpaid) means the recipient, or consignee, is responsible for paying all taxes and duties, including customs duties and customs charges, upon delivery of the shipment. In this case, customs charges are calculated based on factors such as the value and type of goods, and the recipient must pay these fees before the goods are released by customs.

DDP (Delivered Duty Paid) means the shipper or seller pre-pays all duties and taxes, including customs duties and customs charges, so the customer receives the package without having to pay any additional taxes and duties upon arrival. This arrangement ensures a smoother customs clearance process and a significantly better customer experience for ecommerce B2C shipments.

Do I need a customs broker?

For commercial shipments above certain value thresholds, a licensed customs broker is required in the US and many other countries. A customs broker is a licensed professional or company that provides customs brokerage services, assisting individuals and businesses in importing goods and exporting goods across international borders. Customs brokers act as intermediaries between the importer or exporter and the Customs authorities, facilitating the clearance of goods through customs and ensuring compliance with relevant laws and regulations. Most carriers offer integrated customs brokerage services for international commercial shipments. For high-volume international shippers, working with a dedicated customs broker or freight forwarder that includes brokerage is standard practice.

What happens if a shipment fails customs clearance?

A shipment that fails customs clearance is held at the customs facility pending resolution. Shipments can be held at customs until all required information is received, which can lead to significant shipment delays. If customs procedures are not properly followed or documentation is incomplete, these delays may be prolonged. If the issue is a missing document, the shipment is released once it is provided. If the issue is a prohibited or restricted item, the shipment may be refused entry, returned to the sender, or seized. Storage fees accumulate during any hold period. It is important to maintain accurate entry records, as customs authorities may request them for compliance checks or audits.

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• Tag: Shipping and Logistics