What a CBP Audit Actually Is — and Why It Matters
U.S. Customs and Border Protection doesn't just inspect goods at the border. They audit importers after the fact — sometimes years later. This process is called a Customs Compliance Audit, formally known as a Focused Assessment (FA) under CBP's Regulatory Audit and Agency Advisory Services (RAAAS) program.
A Focused Assessment has two phases. Phase I is a pre-assessment survey where CBP evaluates your internal controls. Phase II is a full audit of your import transactions. If CBP finds violations in Phase I, you may not even make it to Phase II before penalties are issued.
Under 19 CFR Part 163, importers are required to keep all entry records for five years from the date of entry. CBP can request any of those records during an audit. If you can't produce them, that's a violation — even if the underlying import was perfectly legal.
Penalties under 19 USC 1592 can reach four times the unpaid duties for negligence, and up to the full domestic value of the goods for fraud. For a $500,000 shipment, that's not a number you want to leave to chance.
The Most Common Reasons CBP Selects Importers for Audit
CBP doesn't audit randomly. Their targeting is data-driven. Here's what typically triggers a review:
- Rapid import volume growth — a spike in entries draws attention
- Low dutiable value relative to industry peers — suggests undervaluation
- High error rates on prior entries — CBP tracks your protest and liquidation history
- Country of origin patterns — especially imports from countries with active trade enforcement actions (China, Vietnam, Cambodia under current Section 301 scrutiny)
- First sale valuation claims — CBP scrutinizes these closely
- Industry targeting — CBP issues Trade Alerts for specific HTSUS chapters it considers high-risk
If you import apparel (Chapters 61–62), footwear (Chapter 64), electronics (Chapter 85), or furniture (Chapter 94), you are statistically more likely to be audited. These chapters carry high duty rates and a long history of misclassification and undervaluation.
Step 1: Conduct an Internal Pre-Audit Right Now
Don't wait for CBP to contact you. Run your own audit first.
Pull Your Entry Data for the Last Five Years
Request a full entry summary report from your customs broker. This should include: entry numbers, entry dates, HTSUS classifications, declared values, countries of origin, and duty amounts paid. Look for inconsistencies — the same product classified differently across multiple entries is a red flag.
Check Your HTS Classifications Against the HTSUS
The Harmonized Tariff Schedule of the United States (HTSUS) is publicly available at usitc.gov. For each of your top 10 products by duty spend, verify that your classification is correct down to the 10-digit level. Pay attention to Chapter Notes and Section Notes — these legally govern classification and override general product descriptions.
If you've never done a binding ruling (Form 4647) for your key products, consider filing one. A binding ruling gives you legal protection and locks in your classification. CBP must honor it.
Audit Your Declared Values
Under 19 CFR 152, the transaction value is the price actually paid or payable, plus specific additions: selling commissions, assists, royalties, and proceeds of subsequent resale. Many importers miss assists — tooling, molds, or materials you provided to your overseas supplier for free or at reduced cost. CBP will add the value of assists to your declared value. If you've been omitting them, you have an underpayment exposure.
Step 2: Get Your Record-Keeping in Order
CBP's "(a)(1)(A) list" — named after 19 CFR 163.1(a)(1)(A) — specifies exactly what records you must keep. The list includes:
- Commercial invoices
- Packing lists
- Bills of lading and airway bills
- Customs entry documents (CBP Form 3461, 7501)
- Proof of origin (certificates of origin, supplier declarations)
- Payment records (wire transfers, letters of credit)
- Purchase orders and contracts
- Any records showing how you determined your declared value
Every single one of these needs to be retrievable within 30 days of a CBP request. CBP typically gives importers a 30-day response window when issuing a CF-28 (Request for Information) or CF-29 (Notice of Action).
If your records are scattered across email threads, Dropbox folders, and your broker's portal, fix that today. Build a centralized document repository organized by entry number. This alone can reduce your audit exposure significantly.
Step 3: Assess Your Country of Origin Documentation
Country of origin is one of CBP's highest-priority audit areas — especially under the current Section 301 tariff regime on Chinese goods, which adds duties of 7.5% to 25% (and in some cases higher) on top of standard MFN rates.
CBP audits regularly uncover transshipment — goods manufactured in China routed through a third country to claim a different origin. Under 19 USC 1304 and CBP's substantial transformation standard, origin is determined by where the last substantial transformation occurred. Routing goods through Vietnam for minor assembly doesn't change origin if the core manufacturing happened in China.
For every product, you need a written origin determination backed by supplier-level documentation: factory certifications, production records, raw material sourcing, and labor records. Verbal assurances from your supplier are not enough. CBP will ask for evidence.
If you've shifted sourcing to avoid Section 301 tariffs, document the legitimate business reasons and the actual manufacturing process in the new country. The burden of proof is on you.
Step 4: Review Your Broker's Role and Your Own Liability
Many importers assume their broker is responsible for classification and valuation errors. They're not — at least not primarily. Under 19 USC 1484, the importer of record is legally responsible for the accuracy of entry information. Your broker acts as your agent.
This means:
- If your broker miscategorizes your goods, you owe the unpaid duties
- If your broker uses the wrong country of origin, you face the penalty
- If your broker doesn't disclose assists, you are liable
Review your broker's power of attorney and service agreement. Confirm they have an internal QA process for classification. Ask them directly: "What is your error rate on liquidations, and how do you catch misclassifications before entry?"
If you're importing more than $5 million in duties per year, consider hiring a licensed customs attorney or in-house trade compliance officer rather than relying solely on a broker.
Step 5: Know What Happens When CBP Contacts You
If you receive a CF-28 (Request for Information), respond within the deadline — usually 30 days. This is not the time to ignore correspondence. A non-response escalates to a CF-29 (Notice of Action), which means CBP has already made a determination and is issuing a formal finding.
When CBP announces a Focused Assessment, they will request an importer questionnaire covering your import volume, sourcing countries, classification methodology, valuation methodology, and internal controls. Answer accurately. CBP auditors are experienced, and inconsistencies between your questionnaire and your actual records will be noticed.
Should You Disclose Errors Voluntarily?
Yes — in most cases. CBP's Prior Disclosure provision under 19 USC 1592(c)(4) dramatically reduces penalties. If you disclose a violation before CBP initiates a formal investigation, your penalty exposure drops from up to 4x unpaid duties (negligence) to just the unpaid duties plus interest. For a $200,000 duty underpayment, that's the difference between an $800,000 penalty and a $200,000 payment.
Prior disclosure must be in writing, submitted to the appropriate CBP Center of Excellence and Expertise (CEE), and include a tender of unpaid duties. Work with a customs attorney on this — the timing and content of the disclosure matter.
Step 6: Build a Compliance Program Before You Need One
CBP gives favorable treatment to importers enrolled in the Customs-Trade Partnership Against Terrorism (C-TPAT) and those with documented internal compliance programs. These don't eliminate audits, but they reduce the severity of findings and demonstrate good faith.
A basic compliance program includes:
- A written classification policy with a defined review process
- A valuation policy covering assists, related-party transactions, and first sale
- An origin verification procedure for each supplier
- Annual broker performance reviews
- A record-keeping SOP with defined retention schedules
This doesn't need to be a 200-page manual. A 10-page internal policy that your team actually follows is worth more than a binder that sits on a shelf.
The Bottom Line
A CBP audit is not a death sentence. Importers who keep clean records, classify accurately, and document their valuation methodology handle audits with minimal disruption. Importers who rely on their broker's judgment, undervalue goods, or ignore country of origin rules face six-figure penalties and potential loss of import privileges.
The best time to prepare was before you started importing. The second best time is today.
Start building your trade compliance foundation with Regenerate Trade — get started at /get-started