After the organizational setup comes the decisive step: the customs audit itself.
The main focus lies on the customs value, tariff classification, Incoterms, and the traceability of import transactions.
This article explains how a customs audit typically unfolds, what auditors look for most closely, and how to prepare effectively to avoid findings and penalties.
Objective of the Import Audit
The customs authorities examine whether
- Duties and taxes have been calculated correctly,
- Tariff codes are accurate and justified,
- Preferential treatments or certificates of origin were used lawfully, and
- All processes and documentation meet regulatory standards.
In short: they verify whether your customs processes are legally compliant and economically accurate.
Typical Audit Procedure
- Announcement / Opening
- Written notice or on-site visit.
- The auditor defines the scope and period under review.
- Opening Meeting
- Clarification of objectives, data access, and communication channels.
- Document Review
- Import declarations, invoices, contracts, and payment evidence.
- Cross-check between customs declarations, accounting entries, and payment flows.
- Sample Analysis
- Selection of shipments for detailed verification.
- Review of tariff classification and customs value calculation.
- Closing Discussion / Potential Reassessment
- Summary of findings and possible corrections or follow-up actions.
Main Audit Areas
1. Tariff Classification
- The technical product description must justify the HS code used.
- Auditors will check whether the classification reflects the actual goods.
- Tip: Keep data sheets, specifications, and product photos ready as proof.
2. Customs Value
- Basis for calculating customs duties and import VAT.
- Auditors verify that all price components are included:
- Invoice value of goods
- Freight and insurance costs
- Royalties, commissions, packaging
- Tip: Prepare a clear “customs value calculation sheet.”
3. Incoterms
- Are freight and additional costs correctly reflected?
- Example: Under CIF, freight must already be included in the customs value.
- Common mistake: Using incorrect or outdated Incoterms.
4. Origin / Preference
- Auditors frequently request supplier’s declarations or certificates of origin.
- Errors can lead to retroactive duty claims.
- Tip: Keep supplier’s declarations up-to-date and centrally archived.
5. Documentation & Recordkeeping
- All customs-related documents must be retained for ten years.
- Ensure clear linkage between
- Customs entry
- Invoice
- Payment evidence
- Accounting record
Common Findings and How to Prevent Them
| Issue | Possible Consequence | Preventive Action |
|---|---|---|
| Incorrect tariff classification | Duty reassessment | Maintain technical documentation & review regularly |
| Incomplete customs value | Additional taxes | Document full value breakdown |
| Missing Incoterms on invoice | Wrong cost basis | Include Incoterms on all invoices |
| Outdated supplier’s declaration | Loss of preferential treatment | Update annually and store centrally |
| Missing proof of payment | Questioned transaction value | Provide accounting entry + bank record |
Self-Check Before the Audit
– Are invoices, freight, and payments fully documented?
– Is a technical product description available?
– Are Incoterms consistent and visible on invoices?
– Are tariff codes verified in the latest customs database?
– Are origin statements valid and current?
– Is your customs value calculation clear and traceable?
Conduct During the Audit
- Stay professional: Auditors are control partners, not opponents.
- Avoid speculation: Confirm only what you can prove.
- Show transparency: Structured records build trust.
- Ask questions: Clarify uncertainties right away.
- Take notes: Record key statements and any agreed follow-ups.
Conclusion
A customs audit is manageable if you know your processes.
Structured records, correct tariff codes, and consistent use of Incoterms ensure a confident and compliant audit.
In Part 3, we’ll move on to the Preference / WUP Audit, focusing on supplier’s declarations, origin proofs, and the most common compliance pitfalls.