Executive Summary On September 23, 2026, U.S. Customs and Border Protection announced a voluntary, two-year test of an Automated Commercial Environment (ACE) Electronic Export Manifest (EEM) for truck cargo, beginning October 23, 2026. The test—limited to nine truck carriers—requires participants to submit seven initial data elements at least 24 hours before departure from the United States, followed by a complete export manifest no later than two hours before arrival at the final port of export. CBP says that, upon sufficient test analysis, it intends to initiate rulemaking that would require electronic export manifest data before cargo is loaded onto the truck for all international truck exports. The test is the latest phase of CBP’s export modernization agenda, which has already produced a final rule for rail cargo (effective October 26, 2026). For cross-border carriers and exporters, the direction is clear: compliance data is moving upstream—before the truck reaches the border, and eventually before it is loaded. Nothing is mandatory yet, but the carriers that prepare now will be better placed when it is.

CBP’s Truck Export Manifest Test: What a 24-Hour Advance Filing Could Mean for Cross-Border Carriers

(CBP卡车出口舱单测试：提前24小时申报对跨境承运人意味着什么)

1 · The Test at a Glance

The Basics

Source: 91 FR 60383 (Doc. 2026-19414; docket USCBP-2026-1189); CSMS #70005765, September 23, 2026

The Two-Stage Filing Requirement

The test establishes a two-stage filing structure that represents a significant departure from current practice:

Stage 1: Initial Filing (24 Hours Before Departure)

Participants must submit seven limited data elements at least 24 hours prior to departure from the United States, at the lowest bill level:

Source: 91 FR 60383; CBP

Stage 2: Complete Export Manifest (2 Hours Before Final Port Arrival)

The complete manifest must be submitted no later than two hours prior to arrival at the final U.S. port of export. It adds transportation and shipment details including:

• Driver identification information
• U.S. port of export
• Foreign port of unlading
• SCAC (Standard Carrier Alpha Code)
• Vehicle VIN or license plate
• Manifest number
• Estimated departure date
• Empty or loaded status
• Mexican pedimento number (conditional, for shipments to Mexico)

Source: 91 FR 60383; CBP

⚠️ Critical Takeaway: Read the deadline carefully. The notice measures the 24 hours from departure from the United States—the border crossing—not from the moment a truck leaves its origin. For short-haul lanes, that effectively means filing before the truck is even loaded or dispatched; for long-haul lanes, the data is due while the truck is still in transit. The notice also says the test will examine the feasibility of requiring submission “generally within a specified time before the cargo is loaded on the truck,” which is the model CBP ultimately wants.

2 · The Current System: Why CBP Is Making This Change

The Regulatory Gap

Under existing federal regulations, truck carriers are generally not required to submit an export cargo manifest. Instead, the U.S. Principal Party in Interest (USPPI) or its authorized agent files Electronic Export Information (EEI) through ACE no later than one hour before the truck arrives at the U.S. border.

This creates a significant data gap for CBP. As the agency explains, the current system provides limited pre-departure electronic data for truck exports, and “in many cases, export manifest information is submitted via attachments to email” —a method CBP has described as “not the most efficient or effective method to obtain such data and perform risk assessment”.

CBP’s Strategic Rationale

CBP’s stated goal is to obtain earlier risk-assessment data while preserving the integrity of the final manifest. By receiving limited information 24 hours ahead, CBP can:

• Conduct preliminary screenings before cargo is loaded
• Allocate resources more efficiently
• Flag high-risk shipments before they enter the international supply chain
• Identify shipments for inspection before loading, though inspections could occur at any time before departure

CBP says the test will let it link the Electronic Export Information filed by the U.S. Principal Party in Interest with the carrier’s manifest data, enabling more effective risk assessment and targeted inspections before cargo is loaded.

The Rail Precedent

The truck test follows a final rule for rail cargo published on August 26, 2026, which mandates electronic export manifest transmission for all rail cargo departing the United States. The rail rule is effective October 26, 2026, with enforcement beginning October 26, 2027.

The rail rule requires:

• Seven data elements 24 hours prior to departure (the same seven elements as the truck test)
• All other mandatory data elements two hours prior to departure of the train
• Elimination of paper, email, and document-image submissions

The truck test mirrors the rail structure, with one difference in the second stage: the complete truck manifest is due two hours before arrival at the final port of export, rather than two hours before departure. CBP’s stated end-state for trucks is a rule requiring data before cargo is loaded.

The Broader Export Modernization Agenda

The truck test is part of a broader effort to modernize export manifest processing across modes:

3 · The Operational Impact: Compliance Moves Upstream

What Changes for Carriers

The most significant operational change is timing. Under the current system, carriers and exporters can finalize shipment details relatively close to departure—often within hours. The test requires seven data elements to be locked in at least 24 hours before the shipment departs the United States.

For carriers operating expedited and exception-driven freight, this creates real challenges. Trade press coverage of the notice makes the same point: the operational impact would fall hardest on expedited and exception-driven U.S.-Mexico and U.S.-Canada truck freight, where shipment details are often finalized late.

What Changes for Exporters

For exporters, the 24-hour filing requirement means:

• Shipment details must be finalized earlier in the process
• Coordination between exporters, freight forwarders, customs teams, and truck carriers becomes more critical
• Documentation accuracy is now connected to operational planning—errors discovered late are more costly to correct

The Data Quality Challenge

The seven initial data elements may seem straightforward, but obtaining them reliably 24 hours before departure is not always simple:

⚠️ Critical Takeaway: The test does not require a full manifest before loading—but it requires enough data to be locked in at least 24 hours before departure from the U.S. that CBP can conduct meaningful risk assessment. For carriers that thrive on late-breaking dispatch decisions, this represents a fundamental shift in operating model.

4 · The Border Community Impact: Eagle Pass and Beyond

The Border Corridor Perspective

Border crossings such as Eagle Pass, Texas, whose International Bridge II handles commercial truck traffic between the United States and Mexico, illustrate what is at stake: any change to filing timelines affects the daily flow of hundreds of trucks.

What Could Change at the Border

Under the current system, EEI is filed one hour before border arrival. Under the test, participants provide initial data at least 24 hours before departure from the United States, so CBP would see participating shipments earlier. Possible effects, which the test is designed to measure rather than promise, include:

• Earlier visibility into northbound and southbound truck cargo
• More time for CBP to assess risk before trucks reach the bridge
• Fewer delays at the border if low-risk shipments are identified early
• Possible holds before loading if high-risk indicators are detected

CBP’s stated aim is to improve risk assessment while facilitating the movement of legitimate trade.

The Empty Truck Dimension

Notably, the test applies to empty trucks as well as loaded ones. CBP’s notice specifically includes an “empty or loaded status code” among the required data elements, and states that the manifest data requirements apply to shipments “including empty trucks”. This is a significant expansion—empty equipment movements across the border will now require the same advance filing as loaded shipments.

5 · What Carriers and Exporters Must Do Now

For Carriers Considering Participation

1. Assess Technical Readiness Participation requires the ability to submit data electronically via ACE—either through the ACE Export Truck Manifest Trade Portal or via EDI. To apply, email cbptruckexportmanifest@cbp.dhs.gov with the subject line “Electronic Export Manifest for Truck Cargo Test Application,” stating your interest and qualifications and providing a contact name and telephone number. Carriers without existing ACE capabilities would need to invest in systems integration.

2. Evaluate Operational Fit The test is limited to nine carriers. Early participants gain:

• Influence over test design and data element refinement
• Operational familiarity ahead of potential mandatory requirements
• Competitive positioning as export modernization accelerates

3. Prepare for Rulemaking CBP has stated that, upon sufficient test analysis, it intends to initiate rulemaking requiring electronic export manifest data before cargo is loaded onto the truck for all international shipments exported from the United States. Carriers that participate in the test will be better positioned for compliance when the rule becomes mandatory.

For All Carriers and Exporters

1. Review Data Quality Processes The seven initial data elements must be accurate and complete 24 hours before departure. Exporters and carriers should:

• Audit current data collection processes
• Identify where shipment details are finalized late
• Develop procedures to lock in key data earlier

2. Coordinate Earlier with Partners The 24-hour requirement means exporters, forwarders, and carriers must coordinate earlier in the shipment lifecycle. Traditional “day-of-shipping” coordination will not work.

3. Review AES Filing Timing While the test focuses on the carrier-level manifest, the USPPI’s EEI filing obligations remain unchanged. Exporters should ensure their AES filings are aligned with the new manifest timelines.

4. Monitor Test Developments CBP will accept comments on all aspects of the test at any time during the test period. Comments can be submitted via email to cbptruckexportmanifest@cbp.dhs.gov.

6 · The Strategic Outlook: What Comes Next

The Rulemaking Path

If the test demonstrates feasibility, CBP says it intends to initiate federal rulemaking to require electronic export manifest information before cargo is loaded onto trucks for all international truck exports. This would represent a significant expansion of ACE’s scope and reinforce the administration’s emphasis on trade facilitation through digital tools.

The Competitive Implications

Carriers that adapt to earlier filing requirements will be better positioned to:

• Avoid border delays through pre-cleared risk assessment
• Differentiate themselves as compliance-ready partners
• Capture market share as shippers prioritize reliable, compliant carriers

Conversely, carriers that cannot adapt may face:

• Higher inspection rates at the border
• Longer dwell times for non-compliant shipments
• Competitive disadvantage as shippers consolidate with compliant carriers

The USMCA Dimension

The test has implications for USMCA trade facilitation. Earlier data visibility could improve coordination with partner nations’ border agencies and strengthen the security of cross-border supply chains under the agreement. For U.S.-Mexico and U.S.-Canada trade—which represents hundreds of billions of dollars in annual commerce—the operational changes could be significant.

7 · Conclusion: Compliance Moves Upstream

CBP’s truck export manifest test represents a structural shift in how cross-border truck freight is processed. The days when export manifest data could be filed one hour before border arrival are ending. The new model requires data 24 hours before departure—moving compliance upstream into the booking, loading, and dispatch phases of the shipment lifecycle.

Key Takeaways

The Bottom Line

For carriers and exporters engaged in cross-border truck freight, the message is clear: the compliance clock is moving upstream. The carriers that prepare now—by improving data quality, coordinating earlier with partners, and investing in ACE capabilities—will be best positioned when the voluntary test becomes a mandatory requirement.

The message is clear: CBP has said it intends to move toward pre-loading electronic export filing for trucks, though the timing depends on the test results. The carriers that prepare early will be best placed to keep their trucks moving across the border.

This analysis reflects CBP’s notice, “Electronic Export Manifest for Truck Cargo Test,” published in the Federal Register on September 23, 2026 (91 FR 60383), and related developments as of October 7, 2026. Specific requirements, timelines, and eligibility criteria are subject to the official Federal Register notice and any subsequent CBP guidance. Carriers and exporters interested in participating in the test should refer to the official notice and contact the Outbound Enforcement and Policy Branch at cbptruckexportmanifest@cbp.dhs.gov.