How to Prepare for a CBP Customs Audit

Preparing for a customs audit means getting your import records, classifications, and valuations in order before CBP arrives — because in an audit, your documentation is the case. CBP doesn’t take your word that you got it right; it tests a sample of entries against the records behind them. Companies that pass have organized records and a story they can prove. This guide explains what a CBP audit is, what triggers one, and how to be ready.

What a CBP Customs Audit Actually Is

The main event is the Focused Assessment, run by CBP’s Trade Regulatory Audit (TRA) program. It’s a risk-based audit of your internal controls over importing — CBP’s way of deciding whether you’re a manageable compliance risk. It runs in stages:

Pre-Assessment Survey (PAS). CBP examines how your import operation is controlled — who classifies, who reviews, how records are kept. This is the first read on your risk, and for most companies it’s where the audit ends.
Assessment Compliance Testing (ACT). Only if the survey shows unacceptable risk does CBP move to deeper transaction-by-transaction testing and, where needed, a follow-up plan.

CBP also runs narrower, faster reviews — sometimes called Quick Response Audits — aimed at a single issue like one product’s valuation or a specific duty-preference claim. Whatever the format, the principle is the same: CBP samples your entries and asks you to prove each declaration. Our overview of how to deal with customs audits walks through the process end to end.

What Triggers a Customs Audit

Some audits are random, but most follow a risk signal. Common triggers include:

A sharp change in import volume, value, or duty paid
Inconsistent tariff classification or customs valuation across similar entries
Claims for duty-free or preferential treatment under a free trade agreement
Imports of goods subject to anti-dumping or countervailing duties
A prior compliance problem, or a referral from another agency
High-risk products, industries, or origin claims

You can’t control whether you’re selected, but you can control whether the triggers point to disorder. Clean, consistent declarations are the best deterrent.

How to Get Ready

Audit preparation is mostly the work you should already be doing. A focused checklist:

Organize your import records. Entries, commercial invoices, bills of lading, and supporting documents should be retrievable for five years from the date of entry (19 U.S.C. § 1508). If you can’t find it, you can’t defend it.
Verify your classifications. Confirm your HTS codes are correct and that the reasoning is documented, not just the result.
Pressure-test your valuations. Make sure customs value rests on a defensible basis — and that assists, royalties, and related-party pricing are handled correctly.
Confirm origin and preference claims. Every duty-preference claim should be backed by records that meet the program’s rules of origin.
Map your internal controls. Document who classifies, who reviews, and how errors get caught — this is exactly what the Pre-Assessment Survey examines.
Run a self-assessment first. Sample your own entries the way CBP will. Our guide to managing import compliance risk shows how to rank what you find.

The single best predictor of an audit outcome is whether you used reasonable care — the legal standard the importer of record is held to (19 U.S.C. § 1484) — and whether your records show it.

If You Find an Error First

A self-review sometimes turns up a real problem. Finding it yourself is an advantage. A prior disclosure — reporting a violation to CBP before it opens a formal investigation — generally caps your penalty at the lost duties plus interest, instead of the much larger penalties for negligence or fraud under 19 U.S.C. § 1592. The window closes once CBP starts investigating, so the time to act on a known error is now, not after the audit notice arrives. Because timing and tender are technical, this is a step worth running by trade counsel.

Frequently Asked Questions

How much notice does CBP give before an audit?

A Focused Assessment begins with formal notice and an opening conference, so you’ll have time to assemble records. That lead time is only useful if your documentation already exists — preparation is what you do before the notice, not after.

How far back can a customs audit go?

CBP can generally review entries within the five-year recordkeeping period, which is why retaining import records for five years from the date of entry is non-negotiable.

What happens if we fail the audit?

CBP may require a Compliance Improvement Plan, assess duties owed, and impose penalties scaled to culpability under 19 U.S.C. § 1592. A cooperative posture and organized records materially improve the outcome.

Should we do a self-audit before CBP shows up?

Yes. Sampling your own entries the way CBP would surfaces problems while you can still fix them — and, where needed, make a prior disclosure that limits penalty exposure.

A customs audit rewards the company that prepared quietly months earlier and punishes the one scrambling after the notice. Reidel Law Firm runs mock customs audits and delivers a flat-fee compliance memo that gets your records and classifications audit-ready. Get a trade compliance memo.