How to Avoid Customs Delays When Importing into the US

A customs delay does not always mean something went seriously wrong. But it does always mean lost time, additional fees, and a disruption to your supply chain. Even a short hold at the port can push back delivery schedules, trigger demurrage and detention charges, and put pressure on your inventory. For businesses that depend on reliable import timelines, the cost adds up fast.

The good news is that the majority of customs delays are preventable. After more than 20 years of supporting importers through US Customs and Border Protection, the team at Express Ocean Logistics has seen the same handful of issues appear repeatedly. This guide covers those issues directly, along with the practical steps that keep shipments moving.

How US Customs and Border Protection Evaluates Your Shipment

Before you can prevent delays, you need to understand how CBP decides which shipments to hold and which to release. CBP uses an automated risk-assessment system called the Automated Targeting System (ATS) to evaluate every import shipment before it reaches the US. The system cross-references your cargo data against risk profiles, supplier histories, trade patterns, and filing accuracy.

Most shipments that clear quickly share a few things in common. Their documentation is accurate and consistent across every filing. Their HTS classifications match the declared product descriptions. Their ISF was submitted before the vessel departed. And their importer of record has a clean filing history with CBP.

Shipments that trigger a hold tend to have the opposite profile. Even a small discrepancy between the commercial invoice and the ISF data, or a vague product description that does not support the declared classification, can flag your cargo for review. CBP may also select shipments for random examination regardless of filing accuracy, though a clean filing history reduces the frequency of those selections over time.

The Most Common Causes of US Customs Delays

Understanding what triggers a hold is the first step to preventing one. Here are the causes the Express Ocean Logistics team sees most frequently across import shipments.

1. 1
   Late or inaccurate ISF filing

   The Importer Security Filing (ISF 10+2) must be submitted to CBP at least 24 hours before the vessel departs the foreign port of origin. A late ISF, a missing ISF, or an ISF with mismatched data (such as the wrong seller name, buyer address, or cargo description) is one of the fastest ways to trigger a hold. CBP may place your container on a "do not load" list or flag it for mandatory examination upon arrival. Penalties for non-compliance can reach $5,000 per violation.

2. 2
   Incorrect HTS code classification

   The Harmonized Tariff Schedule (HTS) code is the 10-digit number that determines your import duty rate, trade remedy applicability (such as Section 301 tariffs on Chinese goods), and regulatory requirements. Misclassifying your product, even unintentionally, can result in CBP issuing a Request for Information (CBP Form 28), charging additional duties, or holding the shipment pending reclassification. This is one of the most common causes of post-entry audits as well.

3. 3
   Vague or inconsistent commercial invoice descriptions

   CBP requires that commercial invoices describe products in enough detail to support the declared HTS classification. Generic descriptions like "machine parts," "clothing," or "electronic components" are among the most common triggers for a CBP hold. A commercial invoice should state what the product is, what material it is made from, and how it is used. Inconsistencies between the invoice, the packing list, and the ISF also raise red flags in the automated targeting system.

4. 4
   Missing Partner Government Agency certifications

   Many product categories require approval from a US government agency beyond CBP before they can be released. The FDA regulates food, drugs, cosmetics, and medical devices. The CPSC governs children's products and consumer safety. The USDA oversees agricultural and plant-based imports. The FCC regulates electronics and radio frequency devices. If your product requires a certification, prior notice, or approval from any of these agencies and the documentation is missing, your shipment will be held until the requirement is satisfied.

5. 5
   Incorrect country of origin marking

   All goods imported into the US must be marked with their country of origin in a conspicuous place. If CBP determines that goods are not properly marked, they can hold the shipment and require the importer to remark the goods before release. This adds time, storage costs, and often requires the cargo to be moved to a Container Examination Station (CES). Country of origin is also a key factor in determining which Section 301 or antidumping duties apply to your goods.

6. 6
   Unpaid duties, taxes, or bond issues

   If your customs bond is insufficient, expired, or not in place before your shipment arrives, CBP will not release the cargo. Similarly, outstanding duties from previous entries or discrepancies in declared cargo value can result in a hold pending payment or review. For importers shipping commercial goods into the US, a continuous customs bond is almost always the more practical and cost-efficient option compared to a single-entry bond.

How Long Different Types of Customs Holds Last

Not all customs holds are equal. The duration depends on the type of examination, the port workload, the product category, and how quickly the importer and their broker can respond. Knowing what to expect helps you plan contingencies before a hold happens.

How to Prevent Customs Delays Before Your Cargo Ships

The single most effective time to prevent a customs delay is before your cargo leaves the origin country. Once a shipment is on the water, your options narrow. Here is what experienced importers do before every shipment.

File your ISF early and accurately

Submit your ISF as soon as you have confirmed the vessel booking and have your supplier's documentation. Filing 48 to 72 hours before vessel departure, rather than the minimum 24 hours, gives your customs broker time to correct any errors flagged by CBP before the cargo loads. Every data field in your ISF should match the corresponding field in your commercial invoice, bill of lading, and packing list exactly.

Verify your HTS classification before booking

Do not wait until your shipment is en route to determine your HTS code. Confirm the correct classification before you finalize your purchase order with the supplier. If your product is subject to Section 301 tariffs, antidumping duties, or any trade remedy, knowing this in advance lets you plan your landed cost accurately and avoid surprises at port.

If you are unsure of the correct HTS code, your customs broker can advise. For goods where classification is genuinely ambiguous, you can request a binding ruling from CBP through the CROSS (Customs Rulings Online Search System) database. A binding ruling gives you a CBP-confirmed classification that protects you in the event of an audit.

Write clear, specific product descriptions on every document

Your commercial invoice is not just a transaction record. CBP treats it as the primary explanation of what is in the container. Every product line should include the material composition, intended use, and any specifications relevant to the classification. For example, instead of "textile goods," write "100% cotton woven fabric, plain weave, bleached, 200 gsm, for upholstery use." The more specific the description, the less reason CBP has to ask questions.

Identify Partner Government Agency requirements in advance

Before you place your first order with a new supplier or for a new product category, research whether your goods require approval or certification from a US regulatory agency. FDA prior notice for food products must be submitted before the shipment arrives. CPSC testing reports for children's products must accompany the entry. USDA phytosanitary certificates for plant-based goods must be obtained at origin. Discovering a regulatory requirement after your cargo is at port is far more disruptive than preparing for it in advance.

Why a Licensed Customs Broker Is Your Best Line of Defense

Many importers treat customs brokerage as an administrative task to check off after the freight is booked. In practice, a good customs broker is an active compliance partner who catches problems before they reach CBP.

A licensed customs broker brings three things to your import operation that are difficult to replicate on your own. First, they know the current tariff schedule and can classify your goods correctly, including knowing when a product sits at the boundary between two HTS codes and how CBP is currently treating that category. Second, they file your entry summary and ISF through ACE (Automated Commercial Environment), the system CBP uses to process entries, which means they see CBP responses and flags in real time. Third, they know how to respond to CBP requests quickly, which is the difference between a one-day documentation review and a five-day hold.

At Express Ocean Logistics, customs brokerage is part of how we manage your shipment from origin to delivery. When you work with our team, your ISF filing, entry preparation, and communication with CBP are handled by people who do this every day for commercial importers across a range of product categories. If you are importing goods into the US and do not currently have a licensed broker on your team, getting one in place before your next shipment is the highest-impact step you can take. You can reach our team at support@expressocean.us or call us at +1 347 929 0855 to discuss your import requirements.

What to Do If Your Shipment Is Already Held by CBP

Even with thorough preparation, holds can happen. CBP conducts random examinations on fully compliant shipments. When a hold does occur, how quickly you respond determines how much it costs you.

As soon as your broker confirms a hold, ask for the specific reason. CBP categorizes holds as follows: a hold for examination means CBP wants to inspect the physical cargo. A hold for documents means something is missing or inconsistent in the paperwork. A hold by a Partner Government Agency means another federal agency has flagged the goods. Each type has a different resolution path, and knowing which you are dealing with immediately prevents wasted time.

If the hold is documentation-related, your broker will gather the missing information from your supplier, prepare a corrected filing if needed, and submit it directly to CBP through ACE. If the hold involves a physical examination, the cargo will be moved to a Container Examination Station (CES) for inspection. Your broker coordinates with the CES and CBP to schedule and monitor the examination. Once the exam is complete and CBP is satisfied, the cargo is released.

Throughout any hold, your freight forwarder should be monitoring demurrage and detention timelines and working to minimize storage costs while the clearance issue is resolved. If you shipped with Express Ocean Logistics, our team stays in direct contact with CBP and the terminal to push for the fastest possible release. You can read more about how we handled our first-time importer shipments from origin to US delivery in our guide on shipping by ocean freight for the first time.

Building a Long-Term Import Compliance Program

Importers who have the fewest customs delays are not just careful on individual shipments. They build systems that make accuracy the default. A few practices make a significant difference over time.

Maintain consistent HTS codes across all entries. CBP's automated systems look for patterns. If your product has been classified under the same HTS code consistently and you suddenly change the classification without a clear reason, it raises a flag. If you need to reclassify, document the reason and communicate it through your broker before filing.

Audit your supplier's documentation practices. Many documentation errors originate with the overseas supplier, not the importer. Review commercial invoices and packing lists from new suppliers before their first shipment ships. Make sure they understand your description standards, country of origin marking requirements, and the information fields that CBP reviews most closely.

Consider applying for C-TPAT membership. The Customs Trade Partnership Against Terrorism (C-TPAT) is a voluntary CBP program for importers who meet supply chain security standards. C-TPAT members receive fewer inspections, expedited processing, and reduced examination rates. For importers who ship regularly, the program's benefits compound over time.