US Customs Clearance Guide: ISF, Bonds, and Duty Rates Explained

Understanding US Customs Clearance

Importing goods into the United States from China involves navigating a complex customs clearance process. Missing a deadline, filing incorrectly, or choosing the wrong customs bond can result in fines, shipment holds, cargo examinations, and costly storage fees. This guide breaks down every key requirement so you can clear customs smoothly and avoid costly mistakes.

All ocean shipments to the United States require an ISF filing at least 24 hours before vessel loading. Missing this deadline can trigger a $5,000 fine per violation from US Customs and Border Protection (CBP).

ISF (10+2) Filing: What You Need to Know

The Importer Security Filing (ISF), also known as the "10+2" rule, is a mandatory electronic filing required by CBP for all ocean freight entering the United States. It must be submitted no later than 24 hours before the vessel is loaded at the origin port.

The 10 Data Elements Required from the Importer

1. Manufacturer (or supplier) name and address
2. Seller (or owner) name and address
3. Buyer (or owner) name and address
4. Ship-to party name and address
5. Container stuffing location
6. Consolidator (stuffer) name and address
7. Importer of record number (IRS number, EIN, or SSN)
8. Consignee number(s)
9. Country of origin of the goods
10. Harmonized Tariff Schedule (HTS) number — at the 6-digit level minimum

The 2 Data Elements Required from the Carrier

1. Vessel stow plan
2. Container status messages

Important: The ISF must be filed by a party with a US Customs bond. For most importers from China, this responsibility falls on your freight forwarder or customs broker. Late or inaccurate filings can result in $5,000 per violation and CBP holds on your cargo.

Customs Bonds: Single Entry vs Continuous

A customs bond is a financial guarantee between the importer, a surety company, and CBP. It ensures that duties, taxes, and fees will be paid, and that all import regulations will be followed. You cannot import goods into the US without a valid bond.

Feature	Single Entry Bond	Continuous Bond
Coverage	One shipment, one entry	All shipments for 1 year
Cost	$50-200 per entry	$250-600 per year (minimum $50,000 bond amount)
Best for	1-2 shipments per year	3+ shipments per year or frequent importers
Required by CBP	For formal entries over $2,500	Required if importing 2+ times in a 7-day period
Bond amount	Value of goods + duties + fees	10% of estimated annual duties (minimum $50,000)
ISF filing	Included in bond coverage	Included in bond coverage

If you import more than twice per year, a continuous bond is almost always more cost-effective and eliminates the risk of forgetting to purchase a bond for a single entry.

Section 301 Tariffs: The 25% Reality

Since 2018, the US has imposed Section 301 tariffs on a wide range of Chinese-origin goods, with most consumer and industrial products facing an additional 25% duty on top of the standard Most Favored Nation (MFN) rate. Some goods face 7.5% (List 4A), while others are excluded entirely. Here's what you need to know:

• List 1 (25%): Industrial components, machinery, electronics parts
• List 2 (25%): Plastics, chemicals, semiconductors
• List 3 (25%): Most consumer goods, furniture, lighting, auto parts, textiles
• List 4A (7.5%): Apparel, footwear, certain electronics
• Excluded: Certain medical supplies, specific industrial inputs

The correct HTS classification is critical — misclassifying a product to avoid Section 301 duties is considered fraud and carries severe penalties.

HTS Classification Basics

The Harmonized Tariff Schedule (HTS) is a 10-digit code that determines the duty rate for every product entering the US. The first 6 digits are internationally harmonized; digits 7-10 are US-specific. Getting this right matters because:

• The HTS code determines your base duty rate (0% to 25%+ for textiles)
• It triggers or avoids Section 301 tariffs (7.5% or 25% additional)
• It governs whether FDA, FCC, or other agency review is required
• Incorrect classification can result in retroactive duties and penalties

MPF and HMF: The Hidden Import Fees

Beyond duties and tariffs, two additional fees apply to nearly all US imports:

Fee	Rate	Minimum	Maximum
MPF (Merchandise Processing Fee)	0.3464% of entered value	$32.71	$634.62 per entry
HMF (Harbor Maintenance Fee)	0.125% of entered value	No minimum	No cap

The MPF applies to both formal and informal entries. The HMF applies only to ocean freight imports — air freight shipments are exempt from HMF.

FDA and FCC Requirements

Certain products require additional agency clearance before CBP will release them:

• FDA (Food and Drug Administration): Required for food, dietary supplements, cosmetics, medical devices, and over-the-counter drugs. You must register your facility and list your products with FDA.
• FCC (Federal Communications Commission): Required for any device that emits radio frequency energy — including Bluetooth speakers, Wi-Fi routers, smartphones, and IoT devices.
• CPSC (Consumer Product Safety Commission): Children's products require ASTM testing and CPC certification.
• EPA (Environmental Protection Agency): Pesticides, engines, and certain chemicals.

Carrier's Broker vs Self-Operated Customs Broker

When your freight forwarder uses a carrier's customs broker (e.g., UPS, FedEx, or a port broker), you lose visibility and control. Fees are marked up, customs inquiries are funneled through multiple parties, and delays can go unexplained for days. Here's the comparison:

Factor	Carrier's Broker	Self-Operated Broker (MENGMA)
Customs entry fee	$75-150 per shipment	Included in DDP service
Bond cost	Single entry: $50-200	Continuous bond — you pay annual cost only
ISF filing	Separate charge ($25-50 per filing)	Included
Communication	Through carrier → broker → forwarder → you	Direct line to the licensed broker handling your entry
Issue resolution	Slow — multiple handoffs	Fast — one team, one system
Transparency	Often marked up with hidden fees	Full breakdown of all duties and fees

MENGMA LOGISTICS operates its own US customs brokerage with a licensed customs broker and continuous bond authority. This means faster clearance, lower fees, and full accountability — no third-party handoffs.

Common US Import Fees Summary

Fee	Typical Cost	When It Applies
Section 301 Tariffs	7.5% or 25% of declared value	All goods of Chinese origin unless excluded
Standard duty (MFN rate)	0-25% depending on HTS code	All formal entries
MPF	$32.71 – $634.62	All entries
HMF	0.125% of value	Ocean freight only
Customs bond	$50-600 depending on type	All entries over $2,500
ISF filing	$25-50 per filing	All ocean freight
Exam fee (if selected)	$500-2,000+	Random or targeted inspections
Storage/demurrage	$50-200/day per container	If cargo not cleared within free days

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