Why customs brokers are key to US imports

A customs broker is a CBP-licensed specialist who prepares and files import entries, classifies goods, calculates and arranges payment of duties and communicates with US Customs and Border Protection on the importer's behalf. Customs brokerage for US imports matters most when a shipment carries regulatory weight, which is the normal situation for medical devices, diagnostic kits, biological materials and research reagents.

Healthcare importers rarely deal with CBP alone. A single entry can also carry FDA data, a USDA permit or a CDC import permit, and an error in any of them can hold temperature-sensitive cargo at the border. This guide explains what a customs broker does, what the license means, when you need one, how medical customs brokerage works in practice and how to choose a broker.

What does a customs broker do?

A customs broker transacts "customs business" for other people. Federal regulations define that as activity involving CBP concerning the entry and admissibility of merchandise, its classification and valuation, the payment of duties, taxes and fees, and refunds or drawback of those amounts. It also covers preparing the documents and electronic data filed with CBP for those purposes, according to the definitions in 19 CFR Part 111.

In daily practice, the answer to "what does a customs broker do" looks like this:

• Reviews the commercial invoice, packing list and product details before the goods ship.

• Assigns or confirms the tariff classification and checks the declared value and country of origin.

• Files the entry and entry summary electronically with CBP, including any partner agency data.

• Arranges the customs bond and the payment of estimated duties, taxes and fees.

• Responds to CBP and agency questions, holds and document requests.

• Keeps the entry records and advises the importer when it finds an error or omission.

A broker does not decide whether a product is admissible. CBP and the relevant partner agencies make that decision. The broker's job is to present accurate, complete information so the agencies can review the shipment without avoidable delays.

What is a licensed customs broker?

A licensed customs broker is an individual, partnership, association or corporation that holds a broker license issued by CBP under 19 CFR Part 111. The license is what separates a broker from other logistics providers. Without it, a company may not transact customs business on behalf of another party.

The bar for an individual license is specific. Under 19 CFR 111.11, the applicant must be a US citizen who is not a federal employee, at least 21 years old and of good moral character, and must have passed the CBP broker examination with a score of 75 percent or higher within the three years before applying. CBP holds the exam on the fourth Wednesday in April and October unless it publishes a change. A partnership needs at least one licensed member, and a corporation needs at least one licensed officer.

The license comes with ongoing obligations that work as customs brokerage regulatory standards:

The table shows that a license is more than an exam result. It ties the broker to supervision, records and advice duties that CBP can enforce.

Do you need a customs broker to import into the US?

No, not as a legal rule. Under 19 CFR 111.2, an importer transacting customs business solely on its own account does not need a broker license, and neither do its regular employees acting only for it. A company can file its own entries if it has the systems, bond, classification knowledge and staff time to do it correctly.

In practice, most healthcare importers use a broker. FDA's import guidance describes brokers as CBP-licensed firms or individuals who prepare and file customs entries, and it notes that every importation begins with CBP before FDA reviews the entry. Self-filing means taking on electronic entry filing, bond management, classification and agency data work yourself, with people who know both tariff rules and FDA requirements.

When do you need a customs broker in practice?

The question of when do you need a customs broker usually comes down to complexity and frequency. A broker is the practical choice when:

• The goods are regulated by FDA, USDA, CDC or another partner agency.

• The shipment needs a formal entry. Informal entry is generally limited to shipments valued at $2,500 or less, with exceptions, under 19 CFR 143.21.

• You import often enough that a continuous bond and consistent classification records pay off.

• The product is new to you, or its composition, intended use or origin raises classification questions.

• The cargo is time-critical or temperature-sensitive and a hold would damage it.

A formal entry also needs a customs bond before CBP releases the goods, under 19 CFR 142.4. Mercury explains bond options on its US customs bonds page.

Customs broker vs freight forwarder

The customs broker vs freight forwarder question comes up because many logistics companies offer both. The roles are different. A freight forwarder dispatches shipments in international commerce and handles the formalities of moving them. A licensed customs broker handles the customs entry. Some companies hold both functions, but the customs work still requires the license.

One rule protects the importer in this relationship. Under 19 CFR 111.36, a broker who accepts a referral from a forwarder must execute the customs power of attorney directly with the importer of record, not through the forwarder, and nothing in their arrangement can block direct communication between the importer and the broker. Mercury's guide to customs power of attorney walks through that document, and its glossary entry on the importer of record explains the role that signs it.

How does customs brokerage work for healthcare imports?

Customs brokerage for healthcare imports follows the standard CBP entry process, with partner agency data added on top. The broker files one entry, and the data routes to each agency that has a role. Accuracy before arrival is what keeps the shipment moving.

A typical sequence for import customs clearance services for healthcare looks like this:

1. Product facts. The importer supplies a precise description, composition, intended use, manufacturer, quantity, value and origin. "Lab supplies" is not enough.

2. Classification. The broker determines the HTS code. FDA notes that the HTS code indicates whether an entry should be transmitted to FDA, so an incorrect code can change which agency data the entry needs.

3. Authority and security. The importer signs a power of attorney and the bond is in place. Under 19 CFR 141.46 a broker must hold a valid power of attorney before transacting customs business in the importer's name.

4. Entry filing. Entry documentation includes the entry or its electronic equivalent, evidence of the right to make entry, the commercial invoice, a packing list where appropriate and any documents other agencies require (19 CFR 142.3).

5. Agency review. FDA electronically reviews FDA-regulated entries submitted through CBP. Its guidance notes an entry will not be transmitted to FDA for review until 5 days before the arrival date.

6. Entry summary and duties. If the summary is not filed at the time of entry, it is due with estimated duties within 10 working days after entry (19 CFR 142.12).

7. Records and corrections. The broker keeps the records, and the importer reviews what was declared so errors are corrected through the proper process.

The commercial invoice is the document most often behind avoidable questions. Mercury's commercial invoice guide covers what CBP expects to see on it.

FDA-regulated products and medical equipment customs brokerage

Medical equipment customs brokerage starts with the FDA status of the device and the companies involved. FDA's device import guidance lists the basic requirements for foreign manufacturers: establishment registration, device listing, a quality management system, premarket notification or approval unless exempt, labeling and medical device reporting. Foreign manufacturers must also designate a US agent. Initial importers have their own registration and reporting duties.

At entry, the filer submits FDA data through ACE, including applicable affirmation of compliance codes. FDA states that products not meeting its requirements may be detained upon entry. FDA's entry submission guidance also warns that inaccurate or incomplete information may delay review. That is why the manufacturer name, model and registration details on the invoice should match the FDA records exactly. Mercury's guide to medical device shipping regulations covers device-specific points in more depth.

USDA and CDC permits for biological materials

Biological materials can bring in two more agencies. CDC's import rule at 42 CFR 71.54 bars importing an infectious biological agent, infectious substance or vector without a CDC permit, unless an exclusion applies. The same rule states that a CDC permit does not satisfy USDA permitting requirements for materials that may also threaten agriculture.

USDA APHIS Veterinary Services regulates organisms and vectors of livestock and poultry disease under 9 CFR 122.2. According to the APHIS organisms and vectors FAQ, the permit is issued to the US recipient, not the sender, and materials exposed to animal-derived components such as fetal bovine serum can fall in scope. Because the permit sits with the recipient, the lab or importer applies for it, and the broker's role is to confirm that the permit details and conditions match what is declared on the entry. Mercury's article on FDA and USDA rules in bio-med logistics gives more context.

Example: a pre-arrival review for a research reagent

Consider a hypothetical US laboratory importing a cell culture reagent from Europe. The supplier's invoice says "research materials, no commercial value." A broker doing licensed medical customs brokerage would ask for the actual product name, composition, any animal-derived ingredients, intended research use, manufacturer and a realistic value. If the reagent contains bovine serum, the broker would flag a possible APHIS permit question for the lab to resolve with the agency before dispatch. A "no commercial value" label does not remove the need for a declared value, and a research-use label does not by itself exempt the goods from agency rules.

What the importer still owns

Hiring a broker shifts the work, not the legal responsibility. Under 19 CFR 141.1, duties are a personal debt of the importer, and payment to a broker does not relieve the importer if the broker fails to pay CBP. Brokers must give clients a written notice saying exactly that (19 CFR 111.29). The importer also stays responsible for the accuracy of the product information it gives the broker.

That makes the working relationship important. Agree in writing who approves classifications, who signs off on new products, how the importer receives copies of entries and how corrections are handled after filing. Mercury's checklist on preventing customs delays in bio-med shipping lists the document gaps that most often cause holds.

How do you choose a customs broker?

Choose a customs broker on demonstrated experience with your products and agencies, a clear pre-arrival process and transparent records and fees. For healthcare goods, ask these questions before you sign a power of attorney:

• Is the company, or the individual handling your account, a licensed customs broker with a national permit? Ask for the license details.

• Has the team filed entries for your product type, such as devices, reagents, biological specimens or temperature-controlled drugs?

• How does the broker review documents before dispatch, and how far in advance does it need them?

• Who coordinates FDA document requests, USDA or CDC permit checks and agency holds, and what are the after-hours contacts?

• How are fees itemized, who advances duties, and how are extra charges approved?

• How will you receive entry copies and records, and how are post-entry corrections handled?

Treat a promise of guaranteed clearance as a warning sign. No broker controls agency decisions. A good broker shows you its process, explains what it needs from you and tells you early when a product will need extra review.

If you are comparing providers, Mercury's article on the benefits of using a customs broker looks at the value side, and its customs brokerage services page describes how its licensed team handles life sciences entries, documentation and compliance programs alongside cold chain and courier moves.