ACE Portal: The Complete Guide for Importers

The ACE Portal — officially the Automated Commercial Environment — is CBP’s centralized trade processing system that handles every US import and export transaction. If goods are moving through a US port of entry, ACE is involved, whether or not you ever log into it directly.

For importers, understanding how ACE works is not optional knowledge. Errors in ACE filings trigger holds, exams, fines, and delayed shipments. Here is everything you need to know to navigate the system with confidence.

What Is the ACE Portal?

ACE Portal (Automated Commercial Environment): A web-based, government-operated trade processing platform developed by U.S. Customs and Border Protection (CBP) that serves as the single electronic window for all US import and export trade data — replacing the legacy Automated Commercial System (ACS) that operated from 1984 through 2016.

ACE is not just a data entry system. It connects CBP with more than 47 Partner Government Agencies (PGAs) — including the FDA, USDA, EPA, FWS, and ATF — allowing a single filing to satisfy multiple agency review requirements simultaneously. Before ACE, importers had to file separate forms with each agency. Today, one ACE transmission reaches all of them.

The system processes more than 35 million entries per year, covering over $2.8 trillion in US imports (CBP Trade Statistics, 2023). Every commercial shipment entering the US, from a container of electronics to a pallet of pharmaceuticals, generates an ACE record.

CBP mandates ACE filing for all formal and informal entries under 19 USC 1484, which establishes the importer’s obligation to file complete and accurate entry documentation. The implementing regulations sit primarily in 19 CFR Parts 141–143, which govern entry types, timing, and responsibilities.

How the ACE Portal Works: Step-by-Step

ACE functions as the data backbone of US customs clearance. Here is how a standard import entry moves through the system:

Step 1: ISF Filing (Ocean Shipments Only)

For ocean cargo, the importer of record (or their broker) must submit an Importer Security Filing (ISF-10) at least 24 hours before cargo is loaded at the foreign port. This filing is submitted through ACE and is governed by 19 CFR Part 149. ISF data includes seller, buyer, manufacturer, ship-to party, HTS codes, and country of origin — 10 data elements in total.

Step 2: Manifest Transmission by Carrier

The ocean carrier, air carrier, or truck carrier transmits an Advance Cargo Manifest to CBP through ACE before arrival. Carriers have their own ACE accounts and filing deadlines: 24 hours before departure for ocean cargo (the “24-hour rule”), 4 hours before arrival for air cargo, and 30 minutes before arrival for truck cargo.

Step 3: Entry Filing

Once the vessel or aircraft departs, the customs broker submits the entry package through ACE. A formal entry (Type 01 — the most common for commercial goods valued over $2,500) includes the CBP Form 3461 (entry/immediate delivery), commercial invoice, packing list, bill of lading or air waybill, and any applicable permits or licenses required by PGAs.

Step 4: Automated Targeting and PGA Review

ACE routes the filing data to CBP’s Automated Targeting System (ATS), which scores each shipment for risk. Simultaneously, PGA data requirements are checked — if the goods are FDA-regulated food products, for example, the FDA’s Prior Notice must be on file. Clean entries move toward release; flagged entries receive an exam order or a CBP Hold.

Step 5: Entry Release or Exam

CBP either issues a “May Proceed” — allowing the carrier to release the goods — or issues an Intensive Exam, Document Review, or Tailgate Exam order. If released, the goods can move to their destination. If held, they stay at the port until CBP completes its review.

Step 6: Entry Summary and Duty Payment

After release, the broker files the Entry Summary (CBP Form 7501) through ACE within 10 business days of the shipment’s release date. This is when duties, taxes, and the Merchandise Processing Fee (MPF) are formally assessed and paid. ACE records the payment against the importer’s continuous bond.

Step 7: Liquidation

CBP “liquidates” the entry — finalizes the duty assessment — within 314 days of entry summary filing under standard procedures. Liquidation is recorded in ACE and constitutes CBP’s official calculation of what the importer owed. Protests against liquidation decisions are also filed through ACE within 180 days of the liquidation date (19 CFR Part 174).

ACE User Types and Account Access

Not everyone uses ACE the same way. The portal has distinct account types with different permissions and data access levels.

Importers who do not self-file still benefit from having an ACE account. A portal account lets you view every entry filed under your Importer of Record number — including entries your broker filed on your behalf — check bond utilization in real time, and access your trade activity reports. You can request an account at cbp.gov.

If you do not have a broker yet, search all CBP-licensed customs brokers to find a licensed professional who files through ACE on your behalf.

Regulatory Framework: The Laws Behind ACE

ACE is not a voluntary convenience tool — it is the mandatory compliance infrastructure underpinning US trade law. Several specific regulations govern how it operates:

19 USC 1484 — Entry of Merchandise This statute establishes that the importer of record has the right and obligation to make entry and file all required documentation with CBP. ACE is the channel through which that obligation is fulfilled.

19 CFR Part 143 — Simplified Entry Governs simplified entry procedures available through ACE, including informal entries for shipments valued under $2,500 and informal entries for certain low-risk commodities.

19 CFR Part 149 — Importer Security Filing Mandates ISF-10 filing for ocean shipments, defines the 24-hour pre-loading deadline, and establishes penalties of up to $5,000 per violation for late, incomplete, or inaccurate ISF data.

19 CFR Part 24 — Customs Financial and Accounting Procedure Governs duty collection through ACE, including the Merchandise Processing Fee (MPF) and Harbor Maintenance Fee (HMF) that are assessed on most formal entries.

The Trade Facilitation and Trade Enforcement Act of 2015 (TFTEA) This legislation formally authorized ACE as the US government’s single window for trade, directing all 47 PGAs to integrate their data requirements into the platform by February 2018.

For classified goods like pharmaceuticals, chemicals, or food products, the relevant PGA regulations also apply and must be satisfied within the ACE ecosystem. You can browse brokers by specialty to find brokers experienced in PGA-intensive commodity categories.

Real-World ACE Scenarios

Understanding ACE in the abstract is useful. Seeing it in practice is better.

Scenario 1 — Apparel Importer, Port of Los Angeles A clothing brand imports a 40-foot container of garments from Vietnam. Their broker files the ISF 72 hours before loading, transmits a formal Type 01 entry when the vessel departs, and selects HTS codes in Chapter 62 (woven apparel). ACE’s targeting system flags the shipment for a document review because Vietnam garments are a frequent AD/CVD risk category. CBP issues a CF-28 (Request for Information) asking for the mill certificate. The broker uploads it through ACE’s document imaging system, and CBP releases the container within 18 hours. The entry summary is filed 8 days post-release with duties paid via ACE’s automated clearing.

Scenario 2 — Medical Device Importer, Chicago O’Hare A hospital supply company imports diagnostic equipment from Germany. The goods require FDA 510(k) clearance and must be declared in ACE with the correct FDA Product Code and Device Registration Number. When the air entry is filed, ACE automatically routes the FDA data elements to the FDA’s system. The FDA clears the entry within 4 hours, and CBP releases the shipment. No separate FDA paperwork is submitted — ACE handles the inter-agency routing. You can find brokers familiar with FDA-regulated imports by browsing the pharmaceutical specialty listing.

Scenario 3 — First-Time Importer, Port of Miami A small business owner imports a shipment of specialty food products from Italy. They hired a licensed broker, but did not realize the goods require FDA Prior Notice — a separate ACE/FDA requirement for all food imports. Their broker catches the gap before filing, submits Prior Notice through the FDA’s system (which syncs with ACE), and files the entry with the correct Prior Notice Confirmation Number. Without that step, CBP would have refused release. The 10 Core Duties of a Customs Broker include exactly this kind of PGA coordination. You can browse by U.S. port of entry to find brokers at Miami and other major gateways.

Common ACE Mistakes Importers Make

Even experienced importers make filing errors. These are the most costly:

1. Late or Missing ISF The ISF-10 must be filed at least 24 hours before cargo is loaded at the foreign port — not before US arrival. Many first-time importers confuse the two. A single late ISF carries a penalty of up to $5,000 under 19 CFR Part 149. CBP issues ISF liquidated damages notices through ACE, and they are not automatically waived.

2. Wrong HTS Code Choosing an HTS code that is too broad or imprecise can misstate the duty rate, miss AD/CVD applicability, or fail PGA requirements. The correct HTS code determines your legal duty liability. You can research codes at hts.usitc.gov and get binding rulings at rulings.cbp.gov before your first shipment.

3. Using the Wrong Importer of Record Number ACE ties every entry to an IOR number — either a US EIN or a CBP-assigned number. If a broker files with an incorrect or outdated IOR number, the entry may post to the wrong account, creating bond utilization errors and audit mismatches that take months to untangle.

4. Missing PGA Data Elements When a shipment requires FDA, USDA, or EPA data, those elements must be included in the ACE transmission before release. A broker who does not specialize in regulated commodities may omit them. This results in automatic CBP holds. The 10 Key Customs Broker Responsibilities include knowing which PGA requirements apply to each commodity.

5. Failing to Monitor Bond Utilization Continuous bonds have a limit — typically 10% of estimated annual duties and fees — and ACE tracks utilization in real time. Importers with spiking import volumes can hit their bond limit without realizing it, causing entries to pend until the bond is increased. Log into ACE or ask your broker to run a bond activity report regularly.

6. Ignoring ACE Alerts and Queries When CBP issues a CF-28 (Request for Information) or CF-29 (Notice of Action) through ACE, response deadlines are strict. Missing them can result in additional duties, penalties, or entry suspension. These notices are visible in ACE — which is why importers should have at minimum read-only portal access.

ACE Tools and Resources

The National Customs Brokers & Forwarders Association of America (NCBFAA) also publishes ACE training materials and compliance updates useful for importers managing their own ACE accounts.

If you work with a third-party logistics provider that also handles customs clearance, the 3PL with customs clearance guide explains how