Market context
Navigating US Customs Compliance in 2026
US Customs Compliance Briefing · August 2026 · Last verified August 2026
Navigating trade between China and the United States requires understanding complex regulatory structures and tariff layers. Commercial importers face multi-layered duty stacks: baseline Harmonized Tariff Schedule (HTS) Column 1 rates, Section 301 retaliatory tariffs, Merchandise Processing Fees (MPF), and Harbor Maintenance Fees (HMF).
Following the full suspension of Section 321 de minimis duty-free exemptions, 100% of commercial goods originating in China—regardless of shipment value—require formal 10-digit HTS entry declarations through the Automated Commercial Environment (ACE). Accurately calculating customs values and applying correct country-of-origin rules eliminates port holds, avoids 19 U.S.C. § 1592 negligence penalties, and protects landed profit margins.
FOB vs CIF
The Foundational Valuation Rule: FOB Transaction Value vs. CIF
A frequent and expensive mistake made by importers is calculating US duties using the CIF (Cost, Insurance, and Freight) value. While the European Union, United Kingdom, and most Asian nations calculate import tariffs on CIF, the United States is a primary exception. Under 19 U.S.C. § 1401a, U.S. Customs and Border Protection (CBP) evaluates ad valorem import duties strictly on the Transaction Value (FOB / Free on Board).
US CBP Valuation (FOB Basis)
Commercial Ex-Factory Product Price + Foreign Inland Freight
[Excludes: International Ocean/Air Freight & Marine Insurance]
EU / UK / Global Customs Valuation (CIF Basis)
Product Price + Inland Freight + Ocean/Air Freight + Insurance
Financial Impact
Calculating a 25% Section 301 tariff on a CIF value that includes $5,000 in ocean freight results in an unnecessary $1,250 overpayment to CBP. Always deduct international freight and insurance from your customs entry valuation.
Duty stack
The US Duty Stacking Matrix: Base HTS, Section 301 & Administrative Fees
When goods manufactured in China enter a US port, CBP applies a multi-layered tax and fee structure based on the product's 10-digit HTS code, country of origin, and transport mode.
| Tariff / Fee Layer | Rate Range | Applied To | Operational Notes |
|---|---|---|---|
| Base HTS Duty | 0% to 37.5% | FOB Value | Column 1 General Rate applied to all Most Favored Nation (MFN) imports. |
| Section 301 Tariffs | 7.5%, 15%, or 25% | FOB Value | Mandatory retaliatory duty applied to China/Hong Kong origin goods. |
| Merchandise Processing Fee (MPF) | 0.3464% (Min: $32.71; Max: $634.62) | FOB Value | Statutory admin fee for formal entries valued over $2,500. |
| Harbor Maintenance Fee (HMF) | 0.125% (no min/max cap) | FOB Value | Ocean Freight only. Exempt for all Air Cargo shipments. |
| Excise Taxes | Specific volume rates | Quantity / Volume | Applied to highly regulated consumer goods categories. |
De minimis
De Minimis Realities: The Full End of Section 321 Exemptions
The landscape for low-value e-commerce imports has shifted permanently. The former Section 321 $800 de minimis rule—which previously allowed low-value parcels to enter the US duty-free without formal entry—is suspended and codified into permanent CBP regulation (91 FR 37789).
What Is Required for All Shipments from China
- ✓10-Digit HTS Classification: Every parcel—even individual e-commerce shipments valued under $50—must carry a valid 10-digit HTSUS code.
- ✓ACE System Pre-Lodgment: Filers must transmit electronic entry summary data through CBP's Automated Commercial Environment (ACE) prior to vessel/flight arrival.
- ✓Full Duty & Tariff Payment: Duties, Section 301 tariffs, and processing fees are collected on every commercial importation.
Playbook
5-Step Playbook: How to Calculate US Import Tax on China Cargo
Formulas
US Landed Duty & Fee Formulas
To build automated customs cost engines, use these standardized mathematical equations.
Case studies
Worked Case Studies: Commercial Machinery vs. E-Commerce Electronics
Case Study 1: Commercial CNC Machinery via Ocean Freight
- • Cargo: 1 container of Industrial CNC Router Machines shipped from Ningbo to Port of Long Beach.
- • Commercial Invoice Total: $85,000.00 USD (Incoterm: CIF Long Beach).
- • Included Ocean Freight & Insurance: $4,500.00 USD.
- • Classification: HTS Code 8458.11.0090 (Base Duty: 4.4%).
- • Section 301 Status: List 3 (25.0% Tariff).
Base HTS Duty (4.4%): $3,542.00 · Section 301 (25.0%): $20,125.00
MPF (0.3464%): $278.85 · HMF (Ocean, 0.125%): $100.63
TOTAL = $24,046.48 USD (29.87% Effective)
Case Study 2: E-Commerce Consumer Gadgets via Air Cargo
- • Cargo: 500 units of Bluetooth Earbuds shipped from Shenzhen to Los Angeles via Air Freight.
- • Commercial Invoice Total (FOB Shenzhen): $12,000.00 USD.
- • International Air Freight: $1,800.00 USD.
- • Classification: HTS Code 8517.62.0090 (Base Duty: 0.0% / Duty-Free).
- • Section 301 Status: List 4A (7.5% Tariff).
Base HTS Duty (0.0%): $0.00 · Section 301 (7.5%): $900.00
MPF (0.3464%): $41.57 · HMF (Air Freight Exempt): $0.00
TOTAL = $941.57 USD (7.85% Effective)
Entry types
Entry Types, Incoterms (DDP vs. DAP) and Payment Logistics
Choosing the correct customs entry type and purchase Incoterm determines your operational control over border clearance.
Informal Entry (Value up to $2,500)
Used for lower-value commercial shipments. Does not require a customs bond unless the commodity is strictly controlled by Partner Government Agencies (PGAs) like the FDA or FCC. MPF is assessed at a low fixed rate ($2.10 manual, $6.00 or $9.00 automated).
Formal Entry (Value over $2,500)
Mandatory for commercial shipments over $2,500. Requires a Continuous Customs Bond ($50,000 minimum coverage) or a Single Entry Bond (SEB). MPF is calculated at the ad valorem 0.3464% rate.
Delivered Duty Paid (DDP)
The Chinese supplier or their freight forwarder assumes full legal responsibility for customs entry, paying all HTS duties, Section 301 tariffs, and MPF/HMF fees upfront. Preferred for e-commerce and buyers seeking fixed landed pricing.
Delivered at Place (DAP) / FOB
The US importer acts as the Importer of Record (IOR), paying customs duties directly to CBP via Automated Clearinghouse (ACH) or through a US customs broker. Provides complete transparency over true customs values.
FAQ
Frequently asked questions
Are US import duties calculated on FOB or CIF value?
What is the current Section 301 tariff rate on imports from China?
Can I still import goods under $800 duty-free from China?
What is the difference between MPF and HMF fees?
Who is legally responsible for paying duties to US Customs?
How do I avoid penalties for customs misclassification?
Why SIS
Streamline Your US Customs Clearance with Super International Shipping
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