The U.S. customs clearance process is the sequence of filings, payments, and reviews every commercial shipment goes through with U.S. Customs and Border Protection (CBP) before goods can leave the port and be sold in the United States. It runs from pre-arrival electronic filings through cargo release and ends months later with a final government review called liquidation. The core steps are the same for most importers: prepare documents, post a bond, file the entry electronically through CBP’s Automated Commercial Environment, pay duties and fees, clear any inspection, and keep the records. Getting any step wrong risks delays, penalties, or seizure.
Who Files the Entry
If you are the owner or purchaser of the goods, you can file your own entry. No license is required to handle your own paperwork. But if anyone else files on your behalf, that person must hold a customs broker license issued by CBP. Conducting customs business for another party without a license carries penalties of up to $10,000 per unauthorized transaction.1Office of the Law Revision Counsel. 19 U.S.C. 1641 – Customs Brokers
Most commercial importers use a licensed broker. Classification rules and compliance obligations are complex enough that a single misstep on a shipment can cost more than years of broker fees.
Formal Versus Informal Entries
CBP splits imports by value. Shipments worth $2,500 or less generally qualify for informal entry, which uses simplified paperwork and lower fees.2U.S. Customs and Border Protection. CBP Increases Value for the Informal Entry Limit Shipments above that threshold require formal entry, which is the full documentation-and-bond process described in the rest of this article. Textiles, quota goods, and merchandise subject to anti-dumping or countervailing duties always require formal entry regardless of value.
The Section 321 de minimis provision historically allowed goods valued at $800 or less to enter duty-free.3U.S. Customs and Border Protection. Section 321 Programs As of August 2025, that duty-free benefit was suspended. Low-value shipments are now subject to applicable tariffs and fees. Check current CBP guidance before assuming any exemption still applies to small parcels.
Documents to Have Ready
The commercial invoice is the foundation of every entry. Federal regulations require it to list the purchase price in the transaction currency, a detailed description of the goods, and the country where they were produced.4eCFR. 19 CFR 141.86 – Contents of Invoices and General Requirements The value on the invoice is what the buyer actually paid, not the expected U.S. resale price.5U.S. Customs and Border Protection. What Value Should Be on the Commercial Invoice Submitted to U.S. Customs and Border Protection?
A packing list adds the physical details: weight, dimensions, and carton count. The transport document is required too. Ocean shipments use a bill of lading; air cargo uses an air waybill. These identify the shipper and receiver and satisfy CBP’s security screening needs.
The most consequential piece of preparation is identifying the right Harmonized Tariff Schedule (HTS) code for each product. The HTS is a ten-digit system covering every type of merchandise imported into the country, and it determines the duty rate that applies.6Harmonized Tariff Schedule. Harmonized Tariff Schedule The wrong code changes what you owe and is one of the most common triggers for penalties and audits. CBP’s binding ruling program lets importers lock in classification before a shipment arrives.
Pre-Arrival: Importer Security Filing
Ocean shipments carry an additional pre-arrival requirement. The Importer Security Filing (ISF, also called “10+2”) must reach CBP at least 24 hours before the cargo is loaded onto the vessel at the foreign port. Not before U.S. arrival. Before loading.7U.S. Customs and Border Protection. Importer Security Filing and Additional Carrier Requirements It reports the manufacturer, seller, ship-to party, country of origin, and HTS code, among other items.
Late, inaccurate, or missing ISF filings can draw a $5,000 penalty per violation, and repeat failures can trigger a “do not load” order that keeps your cargo off the ship entirely. Air freight is exempt from ISF, though air carriers have their own advance manifest obligations.
Customs Bonds
Before CBP will release a formal entry, a customs bond must be in place. The bond is a financial guarantee, issued by a surety company, that you will pay all duties, taxes, and fees and comply with import rules.8Office of the Law Revision Counsel. 19 U.S.C. 1623 – Bonds and Other Security Two types are available:
- A single entry bond covers one shipment. The amount is generally the total entered value plus duties, taxes, and fees.
- A continuous bond covers all entries for 12 months. The minimum amount is $50,000 or 10% of the duties, taxes, and fees paid in the prior 12 months, whichever is greater.
If you import more than a few times a year, a continuous bond is almost always the cheaper option.9U.S. Customs and Border Protection. Bonds – How Are Continuous and Single Entry Bond Amounts Determined?
Filing the Entry Through ACE
All entry filings go through the Automated Commercial Environment (ACE), CBP’s centralized electronic system for imports and exports.10U.S. Customs and Border Protection. ACE: The Import and Export Processing System Self-filers and brokers alike transmit entry data electronically. Two forms carry the process.
CBP Form 3461 (Entry/Immediate Delivery) requests the release of the goods. It identifies the port of entry, the entry number, the arrival date, and links the bill of lading or air waybill to the specific shipment.11U.S. Customs and Border Protection. CBP Form 3461 – Entry/Immediate Delivery It must be filed within 15 calendar days of arrival at the port.12eCFR. 19 CFR 142.2 – Time for Filing Entry
CBP Form 7501 (Entry Summary) carries the financial details: HTS classifications, declared values, calculated duties, and fees. The Entry Summary must be filed and estimated duties deposited within 10 working days of the merchandise being released from CBP custody.13U.S. Customs and Border Protection. Entry Summary and Post Release Processes Errors here — wrong codes, misreported values, miscalculated fees — are the most common source of penalties in the entire process.
Once ACE receives the transmission, it screens the entry against risk criteria and returns a status. A clean entry gets a conditional release message. A flagged entry generates a hold code indicating whether CBP wants more documentation, a scan, or a physical exam.
Other Agencies That May Hold Your Shipment
CBP is not the only agency with authority over an import. Partner Government Agencies (PGAs) impose their own requirements depending on the product, and these often surprise first-time importers.14U.S. Customs and Border Protection. Partner Government Agencies Import Guides The most commonly encountered:
- FDA regulates food, beverages, drugs, medical devices, and cosmetics, and many products require a prior notice filing before arrival.
- USDA/APHIS oversees agricultural products, live plants, animal products, and wood packaging, often requiring phytosanitary certificates or origin-country permits.
- EPA covers pesticides, chemicals, vehicles, and engines subject to emissions and safety standards.
- CPSC reviews consumer products for safety compliance, including children’s items, electronics, and household goods.
- TTB requires permits and specific labeling for imported alcoholic beverages and tobacco.
- Fish and Wildlife Service regulates wildlife, wildlife products, and certain plants covered by international treaties.
Products containing wood or plant materials face an added layer: the Lacey Act declaration. Importers must supply the scientific name and harvest location of plant materials, filed electronically through ACE. As of January 2026, paper submissions are no longer accepted.15Animal and Plant Health Inspection Service. File a Lacey Act Declaration The covered range is broader than most people expect and now includes furniture, sporting goods, tools, boats, and cork products.
Exams and Inspections
After the electronic entry is processed, the CBP Port Director can order an examination of any cargo.16eCFR. 19 CFR 151.4 – Time of Examination Most shipments clear without one, but two forms exist when an exam is ordered.
A Non-Intrusive Inspection uses X-ray or gamma-ray imaging to view sealed container contents. If the scan matches the paperwork, the container moves on. If densities, shapes, or counts look inconsistent, the entry escalates.
An intensive exam sends the container to a Centralized Examination Station, where officers open it, unpack the packages, and manually verify the goods against the entry documents. The importer pays for all of it: trucking to and from the station, the examination fee, and any storage while the exam runs. A full exam easily adds $1,000 or more in unplanned cost and several days of delay. There is no reimbursement if the exam turns up nothing.
Duties, Fees, and Payment
Duty is calculated by applying the HTS rate to the declared transaction value. Rates range from zero on some raw materials to double digits on goods subject to trade remedies. Two fees apply to almost every formal entry on top of the duty itself.
The Merchandise Processing Fee for fiscal year 2026 is 0.3464% of the imported goods’ value, with a minimum of $33.58 and a maximum of $651.50 per entry. Manual filing adds a $4.03 surcharge.17U.S. Customs and Border Protection. Customs User Fee – Merchandise Processing Fees The Harbor Maintenance Fee applies to cargo arriving by ocean vessel at 0.125% of the cargo’s value.18eCFR. 19 CFR 24.24 – Harbor Maintenance Fee Air freight is exempt from the Harbor Maintenance Fee.
Some shipments also carry anti-dumping or countervailing duties, imposed on specific products from specific countries when foreign manufacturers sell below fair market value or receive government subsidies. These are set through Commerce Department investigations, not through the HTS alone, and can be substantial.
Payment usually flows through the Automated Clearing House, which authorizes CBP to withdraw funds directly from the importer’s bank account.19U.S. Customs and Border Protection. Automated Clearinghouse (ACH) Once payment clears and the entry data checks out, CBP releases the cargo to the carrier. Late payment triggers interest and can result in seizure.
Liquidation and Protests
Release from the port is not the end. Every entry goes through a final CBP review called liquidation, in which the agency makes its official determination on classification, valuation, and duty owed.20Office of the Law Revision Counsel. 19 U.S.C. 1500 – Appraisement, Classification, and Liquidation Procedure If CBP does not act within one year of the entry date, the entry is automatically deemed “liquidated as entered” at the duty rate you originally asserted.21Office of the Law Revision Counsel. 19 U.S.C. 1504 – Limitation on Liquidation CBP can extend the one-year window if it lacks information needed for classification or appraisement, or if the entry is suspended by court order or investigation.
If liquidation results in higher duty than you estimated, CBP bills you. If it comes in lower, you get a refund. Either way, the liquidation notice is your trigger to act if you disagree. You have 180 days from the date of liquidation to file a formal protest challenging CBP’s decision on valuation, classification, duty rates, or other charges.22Office of the Law Revision Counsel. 19 U.S.C. 1514 – Protest Against Decisions of the Customs Service Miss that window and the liquidation is final. No appeals, no corrections.
Recordkeeping
Every document tied to a customs entry — invoices, packing lists, shipping records, classification research, correspondence with your broker — must be kept for five years from the date of entry.23eCFR. 19 CFR 163.4 – Record Retention Period CBP can demand production during that period as part of a post-clearance audit.
Penalties for failing to produce records on lawful demand turn on whether the failure was negligent or willful. A negligent failure can cost up to $10,000 per entry, or 40% of the appraised value of the merchandise, whichever is less. A willful failure can reach $100,000 per entry, or 75% of the appraised value, whichever is less.24eCFR. 19 CFR 163.6 – Production and Examination of Entry and Other Records and Witnesses; Penalties These are per-entry amounts, so importers with high volume and poor records can accumulate real exposure fast. An organized digital archive, with backup copies you control, is the simplest protection.