The 8 Core Services a Customs Broker Provides
A customs broker performs eight essential functions that together cover every regulatory requirement involved in bringing goods into the United States. Each of these services carries financial and legal consequences if done incorrectly — which is why CBP requires brokers to pass a federal licensing examination before they can perform this work on behalf of importers.
Here is what a customs broker does, explained in plain language.
1. File Customs Entries with CBP
Every commercial shipment entering the United States requires a customs entry — a formal declaration submitted to U.S. Customs and Border Protection through the Automated Commercial Environment (ACE). The entry tells CBP what is being imported, where it came from, how much it is worth, and what tariff classification applies.
This is the foundational service a customs broker performs. The broker reviews the importer's commercial documents — commercial invoice, packing list, bill of lading — and translates that information into the standardized format CBP requires. The entry must be filed within 15 calendar days of the shipment's arrival, or within the time allowed by CBP for the specific port of entry. Late entries result in liquidated damages, which can run into thousands of dollars.
Filing an entry is not simply data entry. The broker must verify that the declared value is correct, that the country of origin is properly determined, that the tariff classification is accurate, and that all required supplementary filings (ISF, PGA documents, etc.) have been submitted. A single error in any of these fields can trigger a CBP hold, an examination, or a penalty.
2. Classify Goods Under the HTS
The Harmonized Tariff Schedule of the United States (HTS) contains over 17,000 individual tariff codes. Every imported product must be assigned the correct code, which determines the duty rate, any applicable special tariffs, and which government agencies have jurisdiction over the product.
HTS classification is both a science and an art. The General Rules of Interpretation (GRI) govern how products are classified, and applying these rules to real-world products — especially composite goods, sets, or products that span multiple categories — requires deep expertise. A customs broker reviews product specifications, materials composition, intended use, and sometimes lab reports or manufacturer certifications to determine the correct classification.
Why this matters: the difference between two similar-looking HTS codes can mean a 0% duty rate versus a 25% duty rate. Misclassification is the single most common cause of CBP penalties, and it is also one of the most common causes of duty overpayment. A skilled broker does not just classify your goods — they ensure you are classified under the most accurate and favorable code that the law allows.
3. Calculate Duties, Taxes, and Fees
Once a product is classified, the customs broker calculates the total amount owed to CBP. This includes the base duty rate (determined by the HTS code), any applicable special tariffs (Section 301, Section 232, antidumping, countervailing duties), the Merchandise Processing Fee (MPF), and the Harbor Maintenance Fee (HMF) for ocean shipments.
Duty calculation requires determining the correct customs value of the goods. In most cases, this is the transaction value — the price actually paid or payable for the merchandise. However, adjustments may be required for assists (materials or tooling provided by the buyer to the manufacturer), royalties and license fees, packing costs, and other additions to or deductions from the transaction value. These adjustments are governed by CBP's valuation regulations and can significantly affect the amount of duty owed.
Errors in duty calculation are costly in both directions. Underpayment triggers penalties, interest, and potential audit action. Overpayment is simply money lost — and many importers overpay for years without realizing it because they never have their broker's calculations reviewed.
4. File ISF (Importer Security Filing)
The Importer Security Filing, commonly known as the "10+2" filing, is a security-related submission required for all ocean shipments destined for the United States. The ISF must be filed at least 24 hours before the cargo is loaded onto the vessel at the foreign port of origin.
The ISF contains ten data elements provided by the importer (or their broker), including the seller, buyer, ship-to party, manufacturer, country of origin, and HTS code. The ocean carrier provides two additional data elements. Late ISF filings can result in penalties of $5,000 per violation, and CBP may also issue a hold on the shipment, preventing it from being unloaded at the U.S. port.
A customs broker coordinates ISF filing by gathering the required information from the importer and their supply chain partners, verifying the data against the commercial documents, and submitting the filing through ACE before the deadline. This is a time-sensitive operation that requires efficient communication between the broker, the importer, and the overseas shipper.
5. Handle PGA Filings (FDA, USDA, EPA, CPSC, and More)
More than 49 federal agencies have the authority to regulate imported goods. The most commonly encountered Partner Government Agencies (PGAs) include the Food and Drug Administration (FDA), the U.S. Department of Agriculture (USDA), the Environmental Protection Agency (EPA), the Consumer Product Safety Commission (CPSC), the Fish and Wildlife Service (FWS), the Alcohol and Tobacco Tax and Trade Bureau (TTB), and the Department of Transportation (DOT).
Each PGA has its own filing requirements, forms, data elements, and compliance standards. A customs broker files the required PGA documents alongside the customs entry through CBP's PGA Message Set system. For FDA-regulated products, this may include prior notice filings, food facility registration verification, and drug listing data. For USDA-regulated products, it may include APHIS permits and phytosanitary certificates. For EPA-regulated products, it may include TSCA certifications or engine emission compliance documents.
PGA holds are one of the most common causes of shipment delays. A broker who understands the specific PGA requirements for your product type can prevent these holds by filing complete and accurate PGA data from the start.
6. Arrange Customs Bonds
A customs bond is a financial guarantee between the importer, CBP, and a surety company. It ensures that CBP will be paid all duties, taxes, and fees owed on imported merchandise, even if the importer fails to pay. A customs bond is required for all formal entries (shipments valued over $2,500) and for certain other activities regulated by CBP.
There are two types of customs bonds: single-entry bonds (which cover one specific shipment) and continuous bonds (which cover all entries filed by the importer over a 12-month period). A customs broker helps importers determine which bond type is appropriate, calculates the required bond amount based on their import volume and duty exposure, and arranges the bond through a surety company.
The bond amount must be sufficient to cover the importer's estimated annual duty liability. If the bond amount is too low, CBP can issue an insufficiency notice requiring the importer to increase their bond — failure to comply can halt all imports. A broker monitors bond sufficiency as the importer's volume and duty exposure change over time.
7. Respond to CBP Requests and Examinations
CBP may examine any shipment entering the United States. Examinations can be non-intrusive (x-ray or VACIS scan) or intensive (physical inspection of the cargo). CBP may also issue requests for information (CF-28) asking the importer to provide additional documentation or clarification about a specific entry, or notices of action (CF-29) proposing changes to the classification, value, or other elements of an entry.
A customs broker manages these interactions on the importer's behalf. When CBP selects a shipment for examination, the broker coordinates with the exam site, monitors the examination status, and works to get the shipment released as quickly as possible. When CBP issues a CF-28 or CF-29, the broker prepares a detailed response, providing the documentation and legal arguments necessary to support the importer's position.
Responding to CBP requests incorrectly or late can result in rate advances (CBP changing the duty rate to a higher classification), penalties, and adverse precedent that affects future entries. An experienced broker knows how to respond strategically and within CBP's deadlines.
8. Provide Compliance Consulting and Audit Support
Beyond day-to-day entry filing, a customs broker provides ongoing compliance guidance. This includes reviewing classification databases for accuracy, identifying opportunities to reduce duty costs through trade preference programs (such as USMCA, GSP, or duty drawback), advising on regulatory changes that affect the importer's products, and preparing the importer for CBP audits.
CBP audits importers through its Focused Assessment and Compliance Assessment programs. These audits can review years of customs entries and result in significant penalties if compliance deficiencies are found. A customs broker who has been managing your entries has the historical knowledge and documentation to support your position during an audit.
The best customs brokers do not simply react to compliance problems — they prevent them. They review your entries proactively, flag potential issues before they become penalties, and keep you informed about regulatory changes that affect your supply chain. For a deeper look at what a customs broker is and how they are licensed, see our guide to customs brokers.
What a Customs Broker Does NOT Do
Understanding the boundaries of a customs broker's role is just as important as understanding their services. A customs broker does not handle the physical transportation, storage, or insurance of your goods. These functions are performed by other professionals in the supply chain.
Physical Transport
A customs broker does not arrange ocean freight, air freight, or trucking. That is the role of a freight forwarder. Some companies offer both customs brokerage and freight forwarding under one roof, but the services are distinct. Your broker handles the regulatory side; your forwarder handles the logistics side.
Warehousing and Fulfillment
A customs broker does not store your goods or manage inventory. Warehousing, pick-and-pack, and order fulfillment are the domain of third-party logistics providers (3PLs) and warehouse operators. Your broker's role ends once your goods are released by CBP (or the applicable PGA).
Cargo Insurance
A customs broker does not provide cargo insurance. Marine cargo insurance, which protects your goods against loss or damage during transit, is typically arranged through your freight forwarder or an insurance broker. Your customs broker can advise you on customs valuation implications of insured versus uninsured cargo, but the insurance itself is outside their scope.
Export Filings
Customs brokers specialize in imports. While some brokers also handle export compliance (EAR, ITAR, AES filings), this is a separate function with its own regulations and requirements. If you export goods, you may need a separate export compliance specialist in addition to your import customs broker.
Why These Services Matter
The eight services a customs broker provides are not optional steps in the import process — they are legal requirements. Every commercial importer must file entries, classify goods, calculate duties, file ISFs, submit PGA documents, maintain bonds, respond to CBP inquiries, and maintain compliance. The question is whether you do this yourself or hire a licensed professional to do it for you.
The cost of getting it wrong is significant. CBP penalties for negligent violations start at the lesser of the domestic value of the merchandise or four times the loss of revenue. Gross negligence penalties can reach the domestic value of the merchandise. Fraud penalties can reach four times the domestic value. Beyond penalties, errors cause shipment delays that disrupt your supply chain, damage customer relationships, and erode your margins.
A good customs broker prevents these problems before they occur. They file accurately, classify precisely, calculate correctly, and monitor compliance continuously — so you can focus on running your business. For details on what this costs, see our guide on customs broker fees.