Customs Due Diligence Acquisition: Inheriting Import Liabilities

Key Points

• A buyer that acquires a company through a stock purchase or merger can inherit the target's unpaid customs duties and penalties under successor liability doctrine, even for entries filed years before closing.
• Penalties under 19 U.S.C. 1592 reach up to the full domestic value of merchandise for fraud, making undisclosed customs exposure one of the largest potential liabilities in a deal.
• CBP can liquidate entries and assess duties for up to four years after the date of entry, so pre-close due diligence must cover at minimum the most recent four years of import activity.
• Open protests, pending audits, undisclosed prior disclosures, and an insufficient surety bond are red flags that must be resolved or priced into the transaction before closing.
• Asset purchases provide more structural protection than stock purchases, but asset deals do not automatically eliminate successor liability if CBP treats the buyer as a continuation of the prior business.

On this page

1. Why customs liabilities survive a closing
2. Successor liability: how it attaches and what it covers
3. The pre-close customs due diligence review
4. Red flags that change deal economics
5. Structuring protections and post-close remediation
6. What importers and buyers should do
7. Key references

When a buyer acquires an importing company, it can step into years of accumulated customs exposure: underpaid duties, misclassified merchandise, unpaid antidumping and countervailing duty deposits, and potential civil penalties. A focused pre-close customs due diligence review is the only reliable way to surface that exposure before it becomes the buyer's problem. The links in this article go to the primary documents: the statutes, regulations, and official agency pages themselves. Read the source.

Why customs liabilities survive a closing

Customs duties are obligations owed to the United States government, not to a private counterparty. Because the government is not a party to the purchase agreement, indemnification clauses and representations and warranties between buyer and seller do not bind CBP. If the underlying entity or its import operations continue after closing, CBP can pursue collection and penalty proceedings regardless of what the deal documents say.

The four-year statute of limitations on liquidation and reliquidation means entries filed well before the letter of intent was signed can still be open. Add to that the potential for CBP to pursue fraud claims, which carry a longer limitations period, and the look-back window for due diligence becomes substantial.

Successor liability: how it attaches and what it covers

The legal foundation

Federal courts and CBP apply common-law successor liability principles to customs matters. A successor can be held responsible for the predecessor's customs obligations when the transaction is, in substance, a continuation of the prior business. Courts look at factors such as continuity of management, workforce, location, customers, and product lines. The deal's legal form matters less than its economic substance.

Stock purchases vs. asset purchases

In a stock purchase, the buyer acquires the legal entity, which includes all of its pre-existing liabilities. Customs exposure transfers automatically. In an asset purchase, the buyer acquires specified assets rather than the entity itself, which in theory limits what transfers. However, if the buyer continues operating the same import program under the same importer of record number, uses the same supplier relationships, and retains the same compliance personnel, CBP may treat the transaction as a de facto continuation. Buyers who assume the target's importer of record number are particularly exposed.

What liability looks like in dollar terms

Under 19 U.S.C. 1592, civil penalties for customs fraud can reach the domestic value of the merchandise involved. Penalties for gross negligence can reach four times the unpaid duties, and penalties for negligence can reach two times the unpaid duties. These are statutory maximums; CBP typically mitigates penalties based on cooperation and prior disclosure history. But even a mitigated penalty on a high-volume importer can be material to deal economics. Unpaid antidumping and countervailing duty deposits can be particularly severe because AD/CVD cash deposit rates can be retroactively adjusted through administrative review, creating liability that did not exist at the time of entry.

The pre-close customs due diligence review

Entry summary history

The starting point is a comprehensive pull of the target's ACE entry summary data. This includes entry type, port of entry, country of origin, declared value, HTS classifications, and duty paid for each entry within the look-back window. Pulling the right ACE reports is a practical first step that the target's customs broker can facilitate. Look for patterns of inconsistency: the same goods classified differently across entries, wide swings in declared value, or entries that shift country of origin without a corresponding change in supplier.

Classification and valuation accuracy

Work through a representative sample of entries with a customs broker or trade attorney. Confirm that the HTS classifications match the actual goods and that the dutiable value includes all elements required by the valuation rules, such as assists, royalties, and proceeds of resale that flow back to the seller. Errors in classification or valuation are the most common source of underpaid duty and 1592 exposure.

AD/CVD exposure

Check whether any of the target's imported products are subject to antidumping or countervailing duty orders. AD/CVD liability is assessed separately from ordinary duties and can be substantial. Confirm that the correct cash deposit rates were applied at entry, that the correct scope of each order was applied to the goods, and that no entries are pending administrative review that could result in retroactive assessment.

Section 301 and Section 232 tariff compliance

Confirm that the target applied the correct additional duty rates for any goods subject to Section 301 or Section 232 tariffs, and that any exclusions claimed were properly documented and applicable to the specific goods and HTS headings covered. Misapplied exclusions are a source of duty underpayment that may not surface until a CBP audit.

Prior disclosures, audits, and protests

Ask the target to disclose: any pending or recently resolved CBP audits or Focused Assessments; any prior disclosures filed under 19 U.S.C. 1592(c)(4); any open protests filed under 19 U.S.C. 1514; and any pending or recently settled penalty notices. Each of these represents either a known liability or a contingent one. A prior disclosure in progress can significantly limit penalty exposure if cooperated with fully, but it also signals that the target identified a compliance problem.

Bond posture

Review the target's continuous entry bond. The bond amount must be sufficient to cover the target's import activity, including AD/CVD liability. An undersized bond is itself a compliance deficiency, and CBP can demand a bond increase or move the importer to single-transaction bonds. Confirm with the surety that the bond is in good standing and that there are no open claims against it.

Importer of record and power of attorney

Confirm who holds the importer of record number and how powers of attorney are structured. If the IOR number is in the name of the target entity, a stock purchase transfers it automatically. If the buyer intends to consolidate the target into its own import program post-close, planning that transition carefully is critical to avoid creating gaps in compliance coverage. Review the import compliance checklist framework as a model for what a healthy ongoing program looks like.

Red flags that change deal economics

• Open CBP Focused Assessment or audit: This means CBP is already reviewing the target's import practices. The scope and findings of that audit transfer with the entity.
• Undisclosed penalty proceedings: Any Form 28 (request for information) or Form 29 (notice of action) from CBP that the target has not disclosed is a serious red flag. These are early indicators of a penalty case.
• Significant AD/CVD entries pending administrative review: The final assessed rate can differ materially from the deposit rate paid at entry, creating liability that is not yet quantified.
• Pattern of country-of-origin manipulation: Entries that shift country of origin to avoid duties, without corresponding changes in manufacturing location, can indicate transshipment, which carries criminal as well as civil exposure.
• Forced labor risk in the supply chain: Goods produced with forced labor are subject to seizure under the Tariff Act. If the target sourced from suppliers or regions with documented forced labor risk, that supply chain must be reviewed carefully before assuming it post-close.
• Inadequate recordkeeping: Under 19 C.F.R. Part 163, importers must retain entry records for five years. If the target cannot produce records, CBP can draw adverse inferences in an audit.

Structuring protections and post-close remediation

Representations, warranties, and indemnification

Even though deal documents do not bind CBP, they do allocate risk between buyer and seller. Require the target to represent that there are no pending audits, penalty proceedings, or material classification disputes; that all duties have been paid; and that AD/CVD cash deposits were made at the correct rates. Back those representations with an indemnification obligation and consider escrow holdbacks sized to the estimated customs exposure identified in due diligence.

Pre-close voluntary remediation

If due diligence uncovers underpaid duties, filing a prior disclosure before CBP initiates a formal inquiry significantly limits penalty exposure under 19 U.S.C. 1592. A seller who cooperates with pre-close remediation demonstrates good faith and reduces the contingent liability that the buyer would otherwise inherit. Build remediation timelines into the deal schedule if the exposure is material.

Post-close actions

After closing, conduct a full internal audit of the inherited import program against a structured compliance framework. Correct classification and valuation errors prospectively. Confirm that the bond is appropriately sized. Notify CBP of any change in corporate structure that affects the importer of record, as required. If the buyer is assuming the target's broker relationships, confirm that powers of attorney are updated and that the broker's compliance procedures align with the buyer's standards.

What importers and buyers should do

• Pull and review at least four years of the target's ACE entry summary data before closing, and extend the look-back if there is any indication of fraud or ongoing proceedings.
• Request written disclosure of all open audits, prior disclosures, penalty proceedings, protests, and surety bond claims as part of the due diligence document request list.
• Engage a licensed customs broker or customs counsel to conduct an independent classification and valuation audit on a representative sample of the target's entries before signing.
• Size indemnification holdbacks to the customs exposure quantified in due diligence, and require the seller to cooperate in any pre-close voluntary disclosure filing needed to remediate identified underpayments.

Key references

• 19 U.S.C. 1592: The primary statute governing civil penalties for customs fraud, gross negligence, and negligence, including the penalty tiers and prior disclosure provisions.
• 19 U.S.C. 1514: The statute governing protests of CBP decisions, including liquidations and duty assessments.
• 19 C.F.R. Part 163: CBP regulations governing recordkeeping requirements for importers, including the five-year retention rule.
• CBP Audit Operations (cbp.gov): Official CBP page describing the Focused Assessment program and other audit methodologies.
• Federal Register (federalregister.gov): Source for antidumping and countervailing duty orders, administrative review notices, and tariff-related rulemakings.
• Harmonized Tariff Schedule of the United States (hts.usitc.gov): The official HTS, used to verify classification accuracy in due diligence entry audits.