How to Prepare for a CBP Audit: A Practical Importer's Guide

A CBP audit — formally called a Focused Assessment (FA) or Compliance Measurement Examination — is not a random inconvenience. It is a structured, document-intensive review of your import program. CBP's Office of Trade auditors will examine your records, your broker's entries, your valuation methodology, and your classification decisions. If they find systemic errors, you can face penalties under 19 U.S.C. § 1592 that reach up to four times the unpaid duties on negligent violations — and higher on fraud.

The good news: most importers who fail audits fail because of disorganization, not deliberate wrongdoing. That means preparation is almost entirely within your control.

Understand What CBP Is Actually Looking For

Before you organize a single folder, understand the audit framework. CBP uses the Focused Assessment process, outlined in its Regulatory Audit Field Procedures Manual. The FA has two phases:

Pre-Assessment Survey (PAS): Auditors review your internal controls to identify risk areas. They send an Internal Control Questionnaire (ICQ) covering five core trade areas.
Assessment Compliance Testing (ACT): If the PAS reveals weaknesses, auditors pull a statistical sample of entries and test them against the law.

The five areas CBP always examines are:

Customs valuation (19 CFR Part 152)
Classification (HTSUS accuracy)
Country of origin and marking (19 CFR Part 134)
Trade agreement claims (FTA eligibility, USMCA certifications)
Antidumping and countervailing duty (ADD/CVD) compliance

Know which of these is your biggest exposure before the auditors arrive. If you import goods from China subject to Section 301 tariffs, your classification accuracy is under a microscope. If you claim USMCA, your supplier certifications better be current and complete.

Get Your Entry Records in Order — Now

Under 19 CFR § 163.4, importers must retain entry records for five years from the date of entry. CBP can request any of these at any time. When an audit starts, you typically have 30 days to produce requested documents.

Pull together and organize the following for every entry in your audit window:

Commercial invoices — must show seller, buyer, unit price, quantity, country of origin, and incoterm
Packing lists
Bills of lading or air waybills
Customs entry summaries (CBP Form 7501)
Arrival notices and delivery orders
Importer Security Filing (ISF) submissions
Binding rulings, if any (NY or HQ rulings from CBP's CROSS database)
FTA certifications of origin (if claiming preferential duty rates)
ADD/CVD deposit confirmations, if applicable

If your broker manages filings, request a full entry data export now. Do not wait for an audit notice to discover your broker filed 200 entries without retaining the underlying invoices. You — the importer of record — are legally responsible for that gap, not your broker.

Audit Your Own Valuation Methodology

Customs valuation is the #1 source of penalties in CBP audits. The legal standard under 19 U.S.C. § 1401a is transaction value — the price actually paid or payable for the goods, plus specific additions.

Common valuation errors that trigger penalties:

Assists not declared. If you provide your overseas factory with tooling, molds, design files, or raw materials at no charge or reduced cost, the value of those assists must be added to the customs value. A $50,000 injection mold provided to a Chinese factory that isn't declared on entries is a direct § 1592 exposure.
Royalties excluded. If you pay a licensor royalties tied to the imported goods, those royalties are often dutiable. CBP scrutinizes this heavily in consumer goods and apparel.
Related-party transactions under-declared. Buying from a parent, subsidiary, or affiliated supplier? The transaction value must still reflect arm's-length pricing or pass a test value or computed value analysis under 19 CFR § 152.103.
First sale vs. last sale. If you're using first sale valuation (the manufacturer's price rather than the middleman's price), you need contemporaneous documentation of the entire supply chain transaction at time of import. This is a legitimate strategy that saves real money — sometimes 5–15% on dutiable value — but it requires rigorous recordkeeping.

Before an audit, have your finance team reconcile your declared customs values against actual invoices, wire transfers, and intercompany pricing agreements for the past five years.

Verify Your HTS Classifications

Pull a list of the top 20 HTS codes by import volume or duty value from your broker. For each one, ask: Can I defend this classification in front of an auditor today?

A defensible classification has:

A written classification rationale referencing the General Rules of Interpretation (GRIs)
Any binding ruling from CBP's CROSS database that supports the position
Section and chapter notes reviewed and documented
No reliance solely on a freight broker's historical practice

Misclassification penalties under § 1592 on a negligence basis carry a maximum penalty of the lesser of the domestic value of the merchandise or four times the unpaid duties. On a $2M annual import program with a 10% duty rate, a systematic misclassification could generate a $80,000+ penalty before any mitigation.

If you've been importing the same product for years under the same HTS code without ever independently verifying it, that is a risk. Codes change. CBP issues classification rulings that reinterpret chapter notes. Section 301 tariffs created enormous pressure on importers to shift to lower-tariff codes — and CBP knows this.

Fix Problems Before CBP Finds Them: Prior Disclosure

This is the most important strategic concept in import compliance: Prior Disclosure.

Under 19 U.S.C. § 1592(c)(4), if you discover a violation and voluntarily disclose it to CBP before a formal investigation begins, your penalty exposure drops dramatically. For negligent violations with a prior disclosure, the penalty is limited to interest on the unpaid duties — not the full statutory penalty amount.

If you discover during your self-audit that you've been under-declaring customs value or claiming an FTA preference without adequate supporting documentation, you have a choice:

Do nothing and hope auditors miss it. (They usually don't.)
File a Prior Disclosure, pay the duties owed, and resolve it at minimal cost.

A typical Prior Disclosure submission includes a narrative explanation of the violation, the corrected entry data, and a tender of unpaid duties plus interest (currently calculated at IRS underpayment rates, around 8% annually). Your trade attorney or licensed customs broker can prepare this. Do not file one without professional guidance — the disclosure must be complete and accurate or it loses its protective effect.

Conduct a Mock Internal Control Review

When CBP arrives for the Pre-Assessment Survey, they will ask structured questions about your internal controls. Prepare written answers in advance for:

Who is responsible for import compliance at your company?
How do you select and oversee your customs broker?
How do you determine HTS classification for new products?
What is your process for verifying country of origin?
How do you track and retain entry records?
Do you have a written import compliance manual?

If the honest answer to most of these is "our broker handles it," you have a serious problem. CBP expects importers — especially those with $5M+ in annual import value — to have documented internal controls. A one-page import compliance policy is better than nothing. A formal Importer Self-Assessment (ISA) program enrollment signals to CBP that you're a low-risk importer and can reduce audit frequency significantly.

Know Your Rights During the Audit

Once the audit begins, you are not powerless.

You can — and should — have legal counsel present for interviews.
You have the right to request reasonable extensions for document production.
You can challenge statistical sampling methodology if the sample is not representative.
Audit findings are not final. You can respond to the Audit Report before CBP issues penalties.

Document every interaction with auditors. Keep a log of what was requested, what was produced, and when. If an auditor makes an oral request, follow up in writing to confirm.

The 90-Day Preparation Checklist

If you have reason to believe an audit is coming — or simply want to be ready — here's what to do in the next 90 days:

Days 1–30:

Pull all entry records for the past five years and confirm you have the required documentation for each
Request a full entry history report from your customs broker
Identify your top 10 HTS codes by duty paid and review classification rationale for each

Days 31–60:

Reconcile declared customs values against actual invoices and intercompany agreements
Review all FTA and ADD/CVD claims for supporting documentation
Document any assists, royalties, or related-party transactions

Days 61–90:

Draft or update your import compliance manual
Conduct a mock Internal Control Questionnaire exercise
Consult a trade attorney about any identified violations and evaluate Prior Disclosure options

The Bottom Line

A CBP audit is survivable — even when there are errors in your entries. What kills importers is discovering problems during the audit rather than before it. The five-year lookback window, combined with statutory penalty multipliers, can turn a $10,000 duty error into a six-figure liability.

Treat this preparation as routine business hygiene, not a crisis response. The importers who get through audits cleanly are the ones who already know what's in their records.

Ready to assess your import compliance posture before CBP does? Get started with Regenerate Trade today →