Every commercial import into the United States is documented, declared, reviewed, released, and tracked through the Automated Commercial Environment (ACE). Developed by U.S. Customs and Border Protection (CBP), ACE is the United States’ official trade processing platform, serving as the central system for importers, customs brokers, carriers, and Partner Government Agencies (PGAs).
Whether you’re importing a single shipment or managing thousands of entries each year, understanding how ACE works is essential for customs compliance. The platform handles everything from entry filing and Importer Security Filing (ISF 10+2) to post-entry corrections, customs bonds, government agency data, and cargo release.
This guide explains how ACE works, who needs an ACE account, how import entries are processed, and the key compliance features every U.S. importer should understand.
What Is the Automated Commercial Environment (ACE)?
The Automated Commercial Environment (ACE) is the electronic trade processing system operated by U.S. Customs and Border Protection (CBP).
ACE serves as the primary platform through which commercial importers, customs brokers, freight forwarders, carriers, and government agencies exchange information related to international trade. Nearly every commercial shipment entering the United States passes through ACE before it is released by CBP.
ACE replaced the legacy Automated Commercial System (ACS) through a phased modernization program that CBP completed in 2018, creating a single platform for import processing, export reporting, and government agency coordination.
Rather than relying on multiple paper-based systems, ACE allows importers to submit customs data electronically, monitor shipment status, pay duties and fees, respond to CBP requests, and maintain records throughout the import lifecycle.
Why ACE Matters to Importers
ACE is much more than an online customs portal.
It is the operational backbone of the U.S. import process, connecting customs filings with cargo release decisions, government agency reviews, duty payments, and post-entry compliance activities.
Every commercial importer benefits from ACE because it provides:
- Electronic customs entry processing
- Faster cargo release decisions
- Centralized communication with CBP
- Visibility into shipment status
- Electronic duty and fee payments
- Import reporting and recordkeeping
- Post-entry corrections and compliance management
Without ACE, commercial imports could not move efficiently through U.S. Customs.
ACE Is the Single Window for U.S. Trade
One of ACE’s most significant features is the Single Window initiative.
Instead of submitting separate documentation to multiple federal agencies, importers transmit information through ACE, which distributes the required data to participating government agencies.
Today, ACE exchanges information with 47 Partner Government Agencies (PGAs), allowing businesses to satisfy multiple regulatory requirements through a single electronic submission.
Examples of Partner Government Agencies include:
- U.S. Food and Drug Administration (FDA)
- U.S. Department of Agriculture (USDA)
- Environmental Protection Agency (EPA)
- Federal Communications Commission (FCC)
- Consumer Product Safety Commission (CPSC)
- Fish and Wildlife Service (FWS)
For importers, this means one customs entry can simultaneously satisfy CBP requirements and the reporting obligations of multiple regulatory agencies.
Who Uses ACE?
ACE supports virtually every participant involved in the international supply chain.
Common users include:
Importers
Businesses use ACE to monitor imports, review entry history, manage customs compliance, and access reports.
Licensed Customs Brokers
Customs brokers prepare and transmit customs entries, manage Importer Security Filings (ISF), file post-entry corrections, and communicate directly with CBP through ACE.
Freight Forwarders
Forwarders coordinate shipment information and support documentation required before cargo reaches U.S. ports.
Ocean, Air, Rail, and Truck Carriers
Carriers submit electronic manifests and transportation information through ACE before shipments arrive in the United States.
Partner Government Agencies
Federal agencies receive product-specific information through ACE to determine whether imported goods meet their regulatory requirements.
ACE vs. ABI: Understanding the Difference
Many importers mistakenly use the terms ACE and ABI interchangeably, but they perform different functions.
ACE (Automated Commercial Environment) is CBP’s overall trade processing platform.
ABI (Automated Broker Interface) is the electronic communication system that allows customs brokers and software providers to submit customs entries directly into ACE.
A simple way to think about the relationship is:
- ACE is the platform.
- ABI is one of the electronic gateways used to send data into that platform.
Most importers never interact directly with ABI because their customs broker submits entries using broker software connected to ACE through the Automated Broker Interface.
Do You Need an ACE Portal Account?
Not every importer needs to file entries directly through ACE, but almost every commercial importer benefits from having an ACE Portal account.
An ACE Portal account provides visibility into your import activity even when a customs broker prepares and submits entries on your behalf.
With portal access, importers can:
- View shipment status
- Monitor customs entries
- Review duty payments
- Access import reports
- Download historical trade data
- Monitor customs bonds
- Review importer account information
For businesses importing regularly, portal access provides valuable oversight without replacing the role of a licensed customs broker.
Opening an ACE Portal account is a straightforward process.
Applicants first register through CBP’s ACE Portal, verify their business information, and designate an account owner who will manage user access.
A typical registration process includes:
- Creating an account request.
- Verifying importer identification information.
- Assigning portal administrators.
- Receiving CBP approval.
- Activating user credentials.
Most portal applications are approved within three to five business days, although processing times may vary depending on the information submitted and CBP’s workload.
For companies importing frequently, establishing portal access early helps avoid delays when shipment visibility becomes important.
ACE Portal Access Is Only the Beginning
Creating an ACE Portal account gives importers visibility into their customs activity, but it is only the first step in understanding how the platform operates.
The real work begins when shipments are filed for entry, reviewed by CBP, and processed through the customs clearance system. Understanding how entry filings move through ACE is essential because every subsequent process, including cargo release, government agency review, duty assessment, and post-entry compliance, builds on that initial customs entry.
In the next section, we’ll examine how import entries are filed through ACE, the different entry types available, and how customs brokers use the system to move commercial shipments through U.S. Customs efficiently.
How Customs Entries Are Filed Through ACE
Once an importer has access to the ACE Portal, the next step is understanding how commercial shipments are processed and the customs entry requirements.
Every shipment entering the United States requires a customs entry unless it qualifies for a specific exemption. While importers remain legally responsible for the information submitted to U.S. Customs and Border Protection (CBP), most commercial entries are prepared and transmitted electronically by licensed customs brokers using the Automated Broker Interface (ABI).
ACE receives the entry data, validates it against CBP requirements, shares information with any applicable Partner Government Agencies (PGAs), calculates estimated duties and fees, and determines whether the shipment can be released or requires additional review.
For importers, ACE acts as the central hub where shipment information moves from initial filing to final customs clearance.
The Typical ACE Entry Process
Although every shipment is different, most commercial imports follow the same basic workflow.
- The importer provides commercial documents to its customs broker.
- The broker classifies the products using the Harmonized Tariff Schedule of the United States (HTSUS).
- Entry data is transmitted electronically to CBP through ABI.
- ACE validates the information and routes applicable data to Partner Government Agencies.
- CBP reviews the submission and either releases the shipment or requests additional information.
- Duties, taxes, and fees are assessed.
- The importer receives confirmation of cargo release and entry processing.
For shipments with complete and accurate documentation, cargo release may occur within minutes after filing. More complex shipments involving PGA reviews or examinations may require additional processing time.
ACE supports numerous customs entry types, each designed for a different import scenario. Choosing the correct entry type ensures the shipment is processed under the appropriate customs procedures.
Type 01: Consumption Entry
Type 01 is the most common entry type used for commercial imports entering U.S. commerce.
Most retail products, manufacturing materials, machinery, consumer goods, and wholesale shipments are filed as Type 01 entries.
Once duties are paid and CBP releases the shipment, the goods may enter the U.S. market.
Type 11: Informal Entry
Informal entries are generally used for lower-value commercial shipments that meet CBP’s eligibility requirements.
These entries require less documentation than formal entries and are often used for smaller commercial imports.
Type 03: Antidumping and Countervailing Duty Entries
Products subject to Anti-Dumping (AD) or Countervailing Duty (CVD) orders require specialized entry procedures.
ACE validates these entries against Department of Commerce case numbers and applicable duty rates before release.
Because AD/CVD entries involve additional compliance requirements, they often receive greater scrutiny than standard commercial entries.
Type 86: Section 321 Entries
Type 86 entries support eligible Section 321 de minimis shipments.
These entries became increasingly important as e-commerce expanded because they allow qualifying low-value shipments to receive expedited customs processing.
However, recent regulatory changes have significantly affected Type 86 eligibility, particularly for certain Chinese-origin goods and shipments impacted by evolving Section 321 restrictions. Importers relying on de minimis treatment should confirm that their shipments remain eligible under current CBP guidance before using this entry type.
What Documents Are Required for an ACE Entry?
ACE itself does not create import documents. Instead, it receives and validates information taken from commercial shipping documents.
Most customs entries require:
- Commercial invoice
- Packing list
- Bill of lading or air waybill
- Purchase order (when applicable)
- Country of origin information
- HTSUS classification
- Customs bond information
- PGA documentation when required
Incomplete or inconsistent documentation frequently results in delays, CBP requests for information, or rejected entry filings.
How ACE Validates Entry Data
Before CBP reviews an entry, ACE automatically performs hundreds of electronic validation checks.
The system compares submitted information against:
- HTSUS classifications
- Country of origin requirements
- Customs bond coverage
- PGA reporting requirements
- Importer identification numbers
- Tariff applicability
- Entry type requirements
If required information is missing or inconsistent, ACE may reject the filing before it reaches a CBP officer.
These automated checks significantly reduce manual processing while improving data quality across the import process.
The Most Common Reasons ACE Entries Are Rejected
Many entry rejections occur because of preventable data errors rather than customs violations.
Some of the most common issues include:
- Incorrect HTSUS classifications
- Invalid importer numbers
- Missing customs bond information
- Country of origin inconsistencies
- Missing PGA data
- Duplicate entry numbers
- Incomplete commercial invoices
In practice, one of the most common causes of ACE rejection is an incorrect HTSUS classification, which creates a mismatch with Partner Government Agency requirements. Correcting the classification often resolves multiple validation errors at once.
Experienced customs brokers typically identify these issues before submission, helping importers avoid delays and additional compliance work.
Cargo Manifests and Entry Filings Work Together
A customs entry is only one part of the import process.
Before imported goods arrive in the United States, carriers submit electronic cargo manifests through ACE. These manifests identify the shipment, transportation details, container information, and bills of lading associated with the cargo.
When the customs entry is later filed, ACE links the entry information with the carrier’s manifest data. This allows CBP to confirm that the shipment being declared matches the cargo physically arriving at the port.
If discrepancies exist between the manifest and the customs entry, CBP may request corrections before releasing the shipment.
Importer Security Filing (ISF) Connects to the ACE Workflow
For ocean imports, another important filing occurs before the customs entry is submitted.
The Importer Security Filing (ISF 10+2) requires importers to provide ten shipment data elements and ocean carriers to submit two additional data elements no later than 24 hours before cargo is loaded onto the vessel at the foreign port. While ISF is a separate filing from the customs entry, both become part of the shipment’s overall compliance record within ACE.
Understanding this relationship is important because filing the customs entry does not satisfy the ISF requirement. Ocean shipments generally require both filings to comply with CBP regulations.
Entry Filing Is Only the Beginning
Once a shipment has been released, the customs process is far from complete.
ACE continues to support importers after cargo release by managing Partner Government Agency communications, post-entry corrections, reconciliation filings, customs reports, and bond administration. These post-entry functions are essential for maintaining long-term customs compliance and responding to changes discovered after an entry has already been accepted.
In the next section, we’ll examine how ACE integrates with Partner Government Agencies, how post-entry corrections work, and why compliance responsibilities continue long after your shipment has cleared customs.
How ACE Connects With Partner Government Agencies
Clearing customs is only one part of importing goods into the United States.
Many products are regulated by federal agencies other than U.S. Customs and Border Protection (CBP). Depending on what you’re importing, your shipment may require approvals, permits, certificates, or additional product data before it can be released.
Rather than requiring importers to submit information separately to each agency, ACE uses the Single Window system to transmit the required data electronically to participating Partner Government Agencies (PGAs).
Today, ACE serves as the central platform for information exchange between CBP and 47 federal agencies, allowing importers to satisfy multiple regulatory requirements through a single customs filing.
Which Government Agencies Use ACE?
Different agencies regulate different products entering the United States.
Some of the most common Partner Government Agencies include:
U.S. Food and Drug Administration (FDA)
The FDA regulates products such as:
- Food and beverages
- Dietary supplements
- Medical devices
- Cosmetics
- Human and animal drugs
When these products are imported, ACE transmits the required FDA data alongside the customs entry.
U.S. Department of Agriculture (USDA)
USDA requirements commonly apply to:
- Plants
- Seeds
- Agricultural products
- Wood packaging materials
- Certain food products
Additional permits or phytosanitary documentation may be required before release.
Environmental Protection Agency (EPA)
The EPA oversees imports that may affect environmental or emissions standards, including:
- Chemicals
- Engines
- Motor vehicles
- Refrigerants
- Certain plastic products
ACE routes environmental reporting information directly to EPA systems.
Federal Communications Commission (FCC)
Electronic products capable of emitting radio frequencies often require FCC compliance.
Examples include:
- Smartphones
- Wi-Fi equipment
- Bluetooth devices
- Smart home products
- Networking equipment
ACE helps transmit FCC-related import data as part of the customs filing.
Consumer Product Safety Commission (CPSC)
The CPSC regulates many consumer products entering the United States, particularly those intended for children.
Examples include:
- Toys
- Furniture
- Children’s products
- Household goods
ACE helps ensure product safety requirements are reviewed before release.
How the ACE Single Window Works
Before the Single Window initiative, importers often submitted similar information separately to multiple government agencies.
Today, that process is significantly more efficient.
When a customs broker submits an entry through ACE:
- CBP receives the customs entry.
- ACE identifies whether regulated products are included.
- Required information is automatically routed to the appropriate Partner Government Agencies.
- Agencies review their portion of the submission.
- Responses are returned through ACE.
- CBP incorporates those responses into the cargo release decision.
From the importer’s perspective, a single electronic submission satisfies multiple federal reporting requirements.
Why PGA Integration Matters
Partner Government Agency reviews often determine whether a shipment can be released immediately or requires additional documentation.
For example:
- An FDA-regulated food shipment may require prior notice.
- An EPA-regulated engine may require emissions certification.
- An FCC-regulated electronic device may require equipment authorization.
- A USDA-regulated agricultural product may require inspection before entry.
Without ACE, coordinating these reviews would involve multiple independent filing systems.
Instead, the Single Window centralizes the process while maintaining each agency’s regulatory authority.
ACE Continues Working After Cargo Release
Many importers assume customs compliance ends once their shipment is released.
In reality, release marks the beginning of the post-entry compliance process.
ACE continues to track imported goods after release by supporting:
- Entry summary management
- Duty reconciliation
- Post-Summary Corrections (PSC)
- Protests
- Liquidation tracking
- Customs reporting
- Bond management
Because import data remains active long after cargo release, importers have opportunities to correct certain mistakes before CBP finalizes the entry.
What Is a Post-Summary Correction (PSC)?
A Post-Summary Correction (PSC) allows importers to correct specific errors discovered after the entry summary has been filed but before liquidation.
Common corrections include:
- HTSUS classification changes
- Customs valuation adjustments
- Country of origin corrections
- Free trade agreement claims
- Duty calculations
Rather than filing an entirely new customs entry, the importer can amend the existing entry electronically through ACE.
For many businesses, PSCs provide an efficient way to maintain compliance while avoiding more complicated post-liquidation procedures.
When Can a PSC Be Filed?
Timing is critical.
Generally, a Post-Summary Correction may be submitted within 300 days of the entry summary date, provided the entry has not yet liquidated.
This gives importers several months to identify errors through internal audits, supplier updates, or customs reviews.
Once liquidation occurs, a PSC is no longer available, and different legal remedies may be required.
Understanding Liquidation
Every customs entry eventually reaches a stage known as liquidation.
Liquidation is the formal process by which CBP finalizes:
- Duty calculations
- Tariff classifications
- Customs value
- Country of origin determinations
- Applicable fees
For most commercial entries, liquidation typically occurs 314 days after the entry summary date, unless CBP extends or suspends liquidation under applicable regulations.
Once an entry has liquidated, CBP’s duty determination generally becomes final unless the importer files a timely protest.
Filing a Protest After Liquidation
If an importer disagrees with CBP’s final decision, the importer may file a formal protest.
Common reasons for protests include:
- Incorrect tariff classification
- Denied duty preference claims
- Customs valuation disputes
- Country of origin determinations
- Improper duty assessments
In most cases, protests must be filed within 180 days after liquidation.
ACE allows importers and customs brokers to monitor liquidation dates and manage protest deadlines electronically, helping ensure important filing windows are not missed.
Post-Entry Compliance Depends on Good Visibility
The ability to file corrections, monitor liquidation, and manage protests depends on having accurate visibility into your customs activity.
ACE provides importers with reporting tools that make it easier to review historical entries, monitor compliance trends, reconcile duty payments, and identify potential issues before they become costly enforcement problems.
In the next section, we’ll explore ACE’s reporting capabilities, customs bond management, and how importers can use ACE data to improve long-term compliance and operational decision-making.
ACE Reporting Gives Importers Complete Visibility
One of the greatest advantages of the Automated Commercial Environment (ACE) is that it gives importers direct access to their customs data.
Rather than relying solely on customs brokers for shipment updates, ACE allows businesses to monitor import activity, review historical entries, analyze duty payments, and identify compliance trends from a centralized dashboard.
For companies importing regularly, this visibility helps improve decision-making, strengthen internal controls, and simplify customs audits.
What Information Can You See in ACE?
Depending on your account permissions, the ACE Portal provides access to a wide range of import information.
Common data available through ACE includes:
- Entry summaries
- Cargo release status
- Duty, tax, and fee payments
- Customs bond information
- Liquidation status
- Protest history
- Post-Summary Corrections (PSC)
- Importer activity reports
- Partner Government Agency communications
Having access to this information allows importers to verify what has been filed on their behalf and quickly identify discrepancies before they become larger compliance issues.
ACE Reports Help Businesses Analyze Their Imports
ACE includes powerful reporting tools that help businesses understand their import activity over time.
Common reports include:
Import Activity Reports
These reports summarize:
- Number of customs entries
- Countries of origin
- Ports of entry
- Import values
- Entry dates
Importers often use these reports to analyze purchasing trends and evaluate supply chain performance.
Duty and Fee Reports
ACE can also summarize:
- Customs duties paid
- Merchandise Processing Fees (MPF)
- Harbor Maintenance Fees (HMF)
- Additional tariff payments
- Historical duty trends
Finance departments frequently use these reports to reconcile customs expenses with accounting records.
Compliance Reports
Compliance reports help businesses monitor:
- Customs entry accuracy
- Post-entry corrections
- Liquidation status
- Protest activity
- Broker filing performance
Regularly reviewing these reports allows importers to identify recurring errors before they develop into larger compliance concerns.
ACE Helps Importers Prepare for Customs Audits
CBP expects importers to exercise reasonable care when importing goods into the United States.
Maintaining accurate records is a key part of that responsibility.
ACE supports audit readiness by providing centralized access to historical import information, making it easier to:
- Verify customs declarations
- Review tariff classifications
- Confirm country of origin
- Analyze duty payments
- Track corrections made after entry
Instead of searching through years of emails and shipping documents, importers can often locate much of the required customs information directly through ACE.
Recordkeeping Requirements Still Apply
Although ACE stores significant amounts of import information, it does not replace the importer’s legal recordkeeping obligations.
Under CBP regulations, importers are generally required to maintain customs records for at least five years from the date of entry.
These records may include:
- Commercial invoices
- Packing lists
- Bills of lading
- Purchase orders
- Country of origin documentation
- Valuation records
- Customs correspondence
- Free trade agreement documentation
ACE should be viewed as a valuable compliance tool rather than a substitute for maintaining complete import records.
Customs Bonds Can Also Be Monitored Through ACE
Most commercial imports require a customs bond.
ACE allows importers to monitor bond information, including:
- Bond type
- Bond status
- Bond coverage
- Surety information
- Bond sufficiency
Businesses importing frequently often use a Continuous Bond, while occasional importers may rely on Single Entry Bonds.
Monitoring bond status helps ensure adequate coverage before shipments arrive and reduces the risk of customs delays caused by insufficient bond amounts.
ACE Improves Communication Between Importers and Brokers
Although licensed customs brokers prepare most customs entries, importers remain legally responsible for the accuracy of the information submitted to CBP.
ACE improves collaboration by giving both parties visibility into the same customs data.
Importers can:
- Review entries submitted by their broker
- Verify tariff classifications
- Confirm duty payments
- Monitor shipment status
- Track post-entry corrections
This transparency encourages stronger compliance and reduces misunderstandings between importers and their customs representatives.
Common Mistakes Importers Make With ACE
Many businesses underutilize ACE after creating their portal account.
Some of the most common mistakes include:
- Never logging into the ACE Portal after registration
- Relying entirely on customs brokers for shipment visibility
- Failing to review entry summaries
- Ignoring liquidation notices
- Missing Post-Summary Correction deadlines
- Not monitoring customs bond sufficiency
- Waiting until a CBP audit to review import data
Using ACE proactively can help identify issues early, reducing the likelihood of penalties, shipment delays, and costly post-entry corrections.
Best Practices for Managing ACE Successfully
Importers that maintain strong customs compliance typically follow several best practices:
- Create an ACE Portal account even if a broker files your entries.
- Review customs entries regularly for accuracy.
- Monitor liquidation dates and Post-Summary Correction deadlines.
- Reconcile duty payments with accounting records.
- Keep supporting import documentation organized.
- Verify HTSUS classifications before importation.
- Monitor updates from CBP affecting customs procedures.
- Conduct periodic internal compliance reviews.
Developing a routine for reviewing ACE data helps businesses strengthen compliance while improving visibility across their supply chain.
Frequently Asked Questions
Do I need an ACE account if I use a customs broker?
No, but it is highly recommended. An ACE Portal account allows you to monitor your imports, review entries, and access customs reports even when your broker handles the filings.
Is the ACE Portal free?
Yes. CBP provides ACE Portal access at no cost to eligible trade participants.
How long does CBP keep import records in ACE?
ACE stores extensive import information, but importers are still legally responsible for maintaining their own customs records for at least five years from the date of entry.
Can I file customs entries myself through ACE?
Most commercial importers use licensed customs brokers to submit entries through the Automated Broker Interface (ABI). Businesses with the necessary systems and expertise may file directly, but doing so requires meeting CBP’s technical and compliance requirements.
Does ACE calculate customs duties?
ACE validates customs entries and applies the appropriate duty calculations based on the information submitted, including HTSUS classifications, customs value, and any applicable tariff programs.
Final Thoughts
The Automated Commercial Environment is much more than a customs filing system. It is the digital foundation of the U.S. import process, connecting importers, customs brokers, carriers, Partner Government Agencies, and CBP through a single platform.
Understanding how ACE works enables importers to move beyond simply clearing shipments. With access to real-time entry information, reporting tools, post-entry correction capabilities, and customs bond monitoring, businesses can build stronger compliance programs while improving visibility across their international supply chains.
Whether you’re importing occasionally or managing thousands of shipments each year, using ACE effectively can help reduce delays, improve recordkeeping, strengthen regulatory compliance, and make navigating U.S. Customs significantly more efficient.
