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# US Customs Entry Types Explained: Formal, Informal, TIB, and Section 321 for Electronics Importers

Every electronics shipment crossing into the US must be entered through CBP — but which entry type applies determines your duty liability, documentation burden, and cash flow. Formal consumption entry, informal entry, Temporary Importation under Bond, Section 321 de minimis, and Foreign Trade Zone admission each serve a different import scenario. Choosing the wrong type means paying duties you didn't have to, or triggering bond liquidations on trade show samples you forgot to export. This guide covers the mechanics, the 19 CFR citations, and the real dollar thresholds that electronics importers need to get right.

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At a glance

De minimis threshold

$800 (19 USC § 1321)

Formal entry threshold

$2,500

TIB bond rate

200% of estimated duties

ISF filing deadline

24 hrs before vessel lading

## CBP entry types and when each applies

### Informal entry — shipments under $2,500

Informal entry applies to shipments with a value under $2,500 (CBP's informal entry threshold, not the de minimis threshold). These shipments use a simplified process — CBP Form 368 or 7501 in abbreviated form — and do not require a licensed customs broker, though one may be used. Informal entries are subject to duties but benefit from streamlined clearance. Electronics samples, low-value test shipments, and personal imports typically qualify. Note that value is the transaction value of the merchandise, not the declared value — CBP applies the transaction value methodology under 19 CFR Part 152.

### Formal consumption entry — shipments over $2,500

Formal entry is required for commercial shipments valued above $2,500 (19 CFR § 142.1). It requires filing CBP Form 7501 (Entry Summary) in the ACE (Automated Commercial Environment) system, accurate HTS classification, proper customs valuation under the transaction value methodology (19 CFR § 152.103), and payment of applicable duties, fees, and taxes. A licensed customs broker is not legally required but is strongly recommended — customs brokers are licensed under 19 USC § 1641 and hold CBP power of attorney on the importer's behalf. Merchandise Release and Entry Summary are two separate steps under ACE; duties are typically due within 10 working days of entry.

### Section 321 de minimis exemption — the $800 threshold

Section 321 (19 USC § 1321) exempts from duty any importation where the fair retail value in the country of shipment is $800 or less — one importation per person per day. The $800 threshold was established by the Trade Facilitation and Trade Enforcement Act of 2016 (TFTEA). This exemption has been heavily used for direct-to-consumer e-commerce from China. However, the Biden and Trump administrations both moved to restrict Section 321 for goods of Chinese and Hong Kong origin — executive orders in 2025 revoked de minimis eligibility for goods subject to Section 301 tariffs on Chinese goods. Companies relying on Section 321 for China-origin electronics imports should verify current CBP guidance before shipment.

### Temporary Importation under Bond (TIB) — trade show samples and test equipment

TIB under 19 USC § 1553 allows goods to be imported duty-free for temporary purposes — trade show display, testing, evaluation, or demonstration — provided they are exported within 1 year (extendable to 3 years by CBP). The importer must post a bond equal to 200% of the estimated duties that would otherwise be due. Goods imported under TIB may not be sold at retail and must be exported in substantially the same condition as imported. TIB is the standard mechanism for importing evaluation hardware, trade show prototypes, and test equipment without paying duty. Failure to export timely triggers liquidation of the bond — the importer pays the bonded duty amount plus potential penalties.

### Foreign Trade Zone (FTZ) — duty deferral and supply chain optimization

FTZs are designated sites within US Customs territory where goods may be admitted, manipulated, manufactured, and re-exported without paying CBP duties until the goods enter US commerce. FTZ admission is not a 'customs entry' — duty is suspended (not paid) during FTZ operations. When goods exit the FTZ for US sale (FTZ activation), duty is paid either on the imported components or on the finished product, whichever is lower — a manufacturing tariff inversion benefit. Electronics manufacturers with US assembly operations can use FTZs to defer duty on imported components until the finished product is sold, improving cash flow significantly on high-volume programs.

### ISF (Importer Security Filing) — the 10+2 requirement

For ocean freight imports, the Importer Security Filing (ISF, commonly called 10+2) under 19 CFR Part 149 must be filed at least 24 hours before the cargo is laden aboard a vessel at the foreign port. The ISF includes 10 data elements from the importer (seller, buyer, importer of record, consignee, manufacturer, ship-to party, HTSUS number, country of origin, container stuffing location, consolidator) and 2 elements from the carrier (vessel stow plan and container status messages). Late, inaccurate, or missing ISF filings carry penalties of up to $5,000 per violation. ISF is not required for air freight — air cargo has separate advance manifest requirements under CBP Air Cargo Advance Screening (ACAS).

## Import clearance process for electronics shipments

01

Establish the customs value of the shipment using the transaction value methodology under 19 CFR § 152.103 — the price actually paid or payable for the merchandise when sold for export to the US, adjusted for commissions, assists, royalties, and proceeds. The declared value determines which entry type applies and is the basis for ad valorem duty calculation.

02

Determine the appropriate entry type based on value and purpose. Under $2,500: consider informal entry. Over $2,500: formal consumption entry required. Trade show samples or test equipment with planned re-export: TIB. Single low-value direct shipment to a consumer: evaluate Section 321 de minimis eligibility — verify current status for goods of Chinese origin before relying on it. US assembly or manufacturing: evaluate FTZ admission.

03

For informal entry: prepare the commercial invoice and packing list. A customs broker is optional but useful. File through ACE. Expect clearance within 1–3 days if no examination is flagged.

04

For formal entry: retain a licensed customs broker (19 USC § 1641). Provide commercial invoice, packing list, bill of lading or airway bill, and any required PGA (Partner Government Agency) documentation — FCC ID, EPA compliance, CPSC certificates as applicable. The broker files CBP Form 7501 in ACE. Duties are assessed and payable within 10 working days of entry date.

05

For TIB: confirm the goods qualify (not for retail sale, will be exported). File CBP Form 7501 with TIB entry type code. Post a surety bond of 200% of estimated duties — bond amount is calculated on the applicable HTS duty rate applied to customs value. Track the bond expiration date and plan export well in advance of the deadline to avoid bond liquidation.

06

For ocean freight shipments: file the ISF in ACE at least 24 hours before vessel lading at the origin port. Your customs broker or freight forwarder typically handles ISF filing on your behalf. Confirm with the carrier that ISF is matched to the bill of lading. Do not wait until the vessel departs — CBP can place the shipment on exam or hold if ISF is late.

07

Respond to any CBP Request for Information (CF-28) or Request for Records (CF-29) within the timeframe stated — typically 20 days. These are standard CBP audit tools used to verify classification, valuation, and origin. Have the commercial invoice, purchase orders, contracts, and supplier cost data accessible. CBP has the authority to liquidate entries at higher duty rates if the importer cannot substantiate the declared value or classification.

## Frequently asked questions

### What's the current status of the Section 321 de minimis exemption?

As of 2025, the Section 321 de minimis exemption ($800 threshold, one importation per person per day) remains law under 19 USC § 1321, but executive orders issued by the Trump administration in early 2025 revoked de minimis eligibility for goods subject to Section 301 tariffs on Chinese-origin goods and goods from Hong Kong. This effectively eliminated de minimis for most electronics imported from China, which are subject to Section 301 duties. Importers using Section 321 for China-origin electronics should consult current CBP Federal Register notices and trade advisories — the regulatory status has been evolving and litigation is ongoing. For goods from TAA-designated countries not subject to Section 301, Section 321 continues to function normally.

### When do I need a licensed customs broker?

A licensed customs broker is legally required only for formal entries (over $2,500) made by foreign corporations or individuals who are not residents or citizens of the US. US-based importers are not legally required to use a broker for any entry type — they may file as self-filers in ACE. However, as a practical matter, most commercial importers use a licensed customs broker for formal entries because CBP classification, valuation, and admissibility rules are complex, errors create duty liability and penalties, and PGA filings (FCC, EPA, FDA, CPSC) require knowledge of agency-specific requirements. For informal entries and TIBs, a broker is optional but often cost-effective. Never use an unlicensed customs filer — CBP enforcement actions against unauthorized brokers result in the importer bearing all penalties.

### How does a Temporary Importation Bond work for trade show samples?

A TIB allows duty-free import of goods that will be exported within 1 year (extendable to 3 years). You post a surety bond equal to 200% of the duties that would otherwise be payable — this is the CBP's security that you'll export the goods or pay the duty. Example: if a shipment of electronics samples has a customs value of $50,000 and the applicable HTS duty rate is 5%, the estimated duty is $2,500, so the TIB bond is $5,000. When you export the goods and file proof of export with CBP, the bond is released. If you fail to export by the deadline, CBP liquidates the bond — you pay the bonded amount plus potentially a penalty. TIB is entered on CBP Form 7501 using entry type code 23. Goods must be exported in the same or similar condition — you can't sell TIB goods at retail or consume them.

### Can I use an ATA Carnet instead of a TIB?

Yes — the ATA Carnet (Admission Temporaire / Temporary Admission) is an international customs document that functions as a pre-approved TIB equivalent accepted in 87+ countries, administered in the US by the US Council for International Business. ATA Carnets are particularly efficient for frequent international trade show travelers because the carnet covers multiple countries on a single document without posting country-by-country bonds — the USCIB collects a single security deposit. For electronics, ATA Carnets cover professional equipment (CPD carnet) and trade show samples (ATA carnet general list). Carnets are valid for 1 year from issuance. The ATA Carnet is generally faster and less administratively burdensome than a TIB for multi-country exhibition travel, while TIB remains the better option for single-country import of high-value equipment where re-export timing is predictable.

**Disclaimer:** Educational resource only. Regulatory requirements change frequently. Consult a licensed US customs broker, trade attorney, or compliance specialist before making decisions.

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