INTERNATIONAL TRADE LAW
CBP ACE: Auditing Your Import History
The Automated Commercial Environment (ACE) is CBP’s online system of record for imports, and an importer can use it to pull and audit its own entry history — finding classification, valuation, and origin errors before Customs does. That self-audit is not just good practice; it is part of the “reasonable care” the law requires of every importer. Treating ACE as a one-way reporting chore misses its most valuable use: as the mirror that shows you exactly what you told CBP, entry by entry.
What ACE Is — and Why Your Data Lives There
ACE is the platform through which the trade community files entries and through which CBP processes them. Every entry your customs broker files on your behalf flows through ACE: the tariff classifications claimed, the declared values, the countries of origin, the duties and fees paid, and any flags from partner government agencies. Over time, ACE becomes a complete record of how your company has represented its imports to the government.
That record cuts both ways. It is the dataset CBP’s own auditors and import specialists draw on when they review an importer. It is also the dataset you can review to catch problems first. Importers can obtain their entry data through the ACE Secure Data Portal and ACE reports; an importer that does not have direct portal access can request its data and should ensure its broker provides entry records on demand.
Why Self-Auditing Is a Legal Duty, Not a Nicety
The Customs Modernization Act shifted the burden of correct entries onto importers under a reasonable care standard. You — not your broker, and not CBP — are responsible for the accuracy of classification, valuation, and origin on every entry. Reasonable care is not a one-time event; it implies ongoing review.
Recordkeeping rules reinforce this. Under 19 U.S.C. § 1508 and 19 C.F.R. Part 163, an importer must keep import records for five years from the date of entry and produce them on CBP’s demand. If you cannot produce required records, 19 U.S.C. § 1509 authorizes penalties — up to $10,000 per entry for a negligent failure and up to $100,000 per entry for a willful one. A periodic ACE self-audit is how you confirm your records are complete and your entries are consistent before any of that is tested.
What to Check When You Audit Your Import History
A useful self-audit looks for the errors CBP looks for. Work through your ACE entry data with these in mind:
| Audit area | What to look for |
|---|---|
| Tariff classification | Same product entered under inconsistent HTS codes; codes that no longer match the goods |
| Customs valuation | Declared values that omit assists, royalties, or other dutiable additions; suspiciously round numbers |
| Country of origin | Origin claims inconsistent with sourcing; marking and preference claims that lack support |
| Special programs | Free-trade-agreement or duty-preference claims without the documentation to back them |
| Duties and fees | Under- or over-payments; entries that should have been flagged for another agency |
| Recordkeeping | Missing invoices, bills of lading, or broker powers of attorney for any entry in the five-year window |
Patterns matter as much as single errors. A classification that drifts across entries, or a value that consistently excludes a dutiable element, is exactly the kind of systemic issue a CBP audit is built to surface.
When the Audit Finds a Problem
Finding an error in your own data is good news — it gives you control over the timeline. If a self-audit reveals a material mistake that cost the government duties, a prior disclosure filed before CBP opens an investigation can sharply reduce penalty exposure under § 1592, often to interest on the lost duties for a negligence-level error. The mechanics are covered in our guide to making prior disclosures to customs. The opposite approach — waiting for a CBP audit or a request for information to surface the issue — forfeits that advantage and can push a case up the culpability ladder.
Build the Self-Audit Into a Routine
- Pull ACE reports on a schedule. Quarterly or semiannual reviews catch drift before it compounds across years of entries.
- Reconcile ACE against your own records. Match entries to purchase orders, invoices, and classification decisions.
- Document the review. A dated record of self-audits is itself evidence of reasonable care and helps in any later mitigation.
- Close the loop on findings. Correct the going-forward process and consider prior disclosure for past errors with a revenue impact.
Frequently Asked Questions
What does ACE stand for? The Automated Commercial Environment — CBP’s primary system for processing imports and exports and the system of record for entry data.
How long do I have to keep import records? Generally five years from the date of entry, under 19 U.S.C. § 1508 and 19 C.F.R. Part 163. Failing to produce them can draw penalties under § 1509.
Can I see my own import history if my broker files my entries? Yes. You can access entry data through the ACE portal and ACE reports, and you are entitled to your records from your broker. The importer remains responsible for accuracy regardless of who files.
What is the benefit of auditing before CBP does? Control and reduced exposure. Catching a revenue error yourself lets you file a prior disclosure, which can cap penalties well below what an audit-driven case would carry.
Want help auditing your import history or filing a prior disclosure? Reidel Law Firm prepares flat-fee import/export compliance memos and represents importers in customs audits and disclosures with direct attorney access. Get an import compliance memo →
