Customs Due Diligence Before Investing in Turkey (2026 Legal Guide)

Learn why customs due diligence is essential before investing in Turkey in 2026. Discover how foreign investors can identify customs risks, review import-export compliance, evaluate customs liabilities, assess investment incentives, and avoid costly customs disputes.

Turkey continues to be one of the most attractive destinations for foreign direct investment due to its strategic location, strong manufacturing capacity, extensive transportation infrastructure, Customs Union relationship with the European Union, and access to regional markets across Europe, Asia, the Middle East, and Africa. Foreign investors regularly acquire Turkish companies, establish manufacturing facilities, purchase industrial assets, form joint ventures, and invest in logistics, technology, pharmaceutical, energy, automotive, textile, and food production businesses.

While investors typically focus on financial, tax, employment, environmental, and corporate due diligence during investment transactions, customs due diligence is frequently overlooked. This oversight can create significant legal and financial risks because customs liabilities often remain hidden until discovered during a customs audit, regulatory investigation, or post-acquisition review.

In 2026, Turkish customs authorities continue expanding post-clearance audit programs, digital customs controls, origin verification systems, valuation reviews, and risk-based compliance monitoring mechanisms. As a result, historical customs violations can generate substantial liabilities for investors long after an acquisition or investment transaction has been completed.

A comprehensive customs due diligence review enables investors to identify potential customs risks, evaluate compliance practices, assess historical liabilities, and make informed investment decisions before capital is committed.

What Is Customs Due Diligence?

Customs due diligence is the process of reviewing a target company’s customs compliance history, import-export operations, regulatory obligations, and potential customs liabilities before completing an investment transaction.

The purpose of customs due diligence is to identify:

• Historical customs violations
• Unpaid customs duties
• Customs audit exposure
• Valuation risks
• Classification errors
• Origin-related issues
• Incentive compliance concerns
• Regulatory investigations

Customs due diligence helps investors determine whether a target company’s customs practices comply with Turkish customs legislation and international trade requirements.

It also provides insight into future risks that may affect investment value, operational continuity, and post-closing liabilities.

Why Customs Due Diligence Is Important for Foreign Investors

Many businesses operating in Turkey rely heavily on imports, exports, international supply chains, customs incentives, and preferential trade arrangements.

As a result, customs compliance often has a direct impact on:

• Profitability
• Supply chain efficiency
• Regulatory exposure
• Corporate valuation
• Business continuity

A company may appear financially healthy while simultaneously carrying significant undisclosed customs risks.

For example:

• Incorrect tariff classifications may create future duty liabilities.
• Valuation practices may be vulnerable to customs challenges.
• Origin claims may not satisfy legal requirements.
• Incentive benefits may be subject to revocation.

Without proper due diligence, investors may unknowingly acquire these risks.

Comprehensive customs reviews therefore represent a critical component of investment protection.

Identifying the Company’s Customs Profile

The first step in customs due diligence involves understanding the target company’s customs profile.

Investors should examine:

• Import activities
• Export activities
• Product categories
• Supply chain structure
• International trade volumes
• Customs procedures utilized
• Customs incentive participation

The complexity of customs exposure often depends on the nature of the business.

Manufacturing companies generally present different customs risks than logistics providers, technology firms, pharmaceutical companies, or food producers.

Understanding the customs profile provides a foundation for evaluating specific compliance risks.

Reviewing Import and Export Operations

Import and export activities should be examined carefully during the due diligence process.

Investors should evaluate:

• Import volumes
• Export volumes
• Major trading partners
• Product categories
• Customs procedures used
• Historical customs declarations

The objective is to determine whether import-export operations have been conducted consistently with applicable customs requirements.

Businesses engaged in substantial international trade often face greater customs exposure because the volume of transactions increases the likelihood of compliance deficiencies.

A detailed review of customs operations helps identify areas requiring further investigation.

Assessing Customs Classification Risks

Tariff classification remains one of the most common sources of customs disputes.

Every imported or exported product must be classified under the appropriate customs tariff code.

Due diligence reviews should evaluate:

• Classification methodologies
• Technical product descriptions
• Historical classification decisions
• Classification consistency

Potential warning signs include:

• Frequent classification changes
• Unusually favorable classifications
• Lack of supporting documentation
• Classification disputes with authorities

Incorrect classifications may result in additional duties, penalties, and interest assessments.

Consequently, classification reviews should form an important part of customs due diligence.

Evaluating Customs Valuation Practices

Customs valuation represents one of the most significant areas of customs risk for foreign investors.

Valuation reviews should focus on:

• Related-party transactions
• Transfer pricing arrangements
• Royalty payments
• Licensing fees
• Technology transfers
• Shared service agreements

Customs authorities frequently challenge valuation methodologies involving multinational corporate groups.

Due diligence should therefore determine whether:

• Valuation policies are documented
• Customs declarations are consistent
• Transfer pricing arrangements have customs implications
• Historical disputes exist

Valuation-related liabilities can be substantial, particularly where large import volumes are involved.

Reviewing Rules of Origin Compliance

Many Turkish businesses benefit from preferential customs treatment under trade agreements and Customs Union arrangements.

Due diligence should evaluate:

• Certificates of origin
• Supplier declarations
• Manufacturing records
• Origin verification procedures

Common risks include:

• Insufficient supporting documentation
• Incorrect origin determinations
• Incomplete supplier certifications
• Weak internal controls

If customs authorities reject preferential origin claims, businesses may become liable for retroactive customs duties, penalties, and interest.

Origin compliance therefore deserves careful attention during investment reviews.

Analyzing Customs Audit History

A company’s customs audit history provides valuable insight into its compliance culture and regulatory exposure.

Investors should review:

• Previous customs audits
• Audit findings
• Penalty assessments
• Settlement agreements
• Ongoing disputes
• Regulatory correspondence

Repeated audit findings may indicate systemic compliance weaknesses.

Even if past issues appear resolved, recurring deficiencies may suggest future enforcement risks.

A thorough understanding of audit history allows investors to evaluate the effectiveness of the target company’s compliance systems.

Reviewing Customs Incentives and Exemptions

Many businesses operating in Turkey benefit from customs-related investment incentives.

Examples include:

• Customs duty exemptions
• VAT exemptions
• Investment incentive programs
• Free zone benefits

Due diligence should assess:

• Eligibility requirements
• Compliance with incentive conditions
• Reporting obligations
• Use of imported machinery
• Regulatory approvals

Improper use of incentives may result in:

• Revocation of benefits
• Additional customs duties
• Interest assessments
• Administrative penalties

Investors should therefore verify that incentive-related obligations have been satisfied fully.

Examining Customs Documentation and Recordkeeping

Strong documentation practices are essential for customs compliance.

Investors should review:

• Customs declarations
• Commercial invoices
• Transport documents
• Origin certificates
• Valuation records
• Customs correspondence

Documentation reviews help determine whether the company can support its customs positions during future audits.

Weak recordkeeping often increases regulatory exposure even when underlying transactions are lawful.

Documentation deficiencies should therefore be treated as significant compliance concerns.

Supply Chain and Trade Compliance Risks

Modern customs enforcement increasingly focuses on supply chain transparency.

Due diligence should evaluate:

• Supplier relationships
• Product sourcing practices
• Country-of-origin controls
• Trade compliance procedures
• Third-party risk management

Supply chain weaknesses may create customs liabilities involving origin claims, classification decisions, sanctions compliance, and product traceability.

Companies with strong supply chain controls generally experience fewer customs disputes.

Customs Risks in Mergers and Acquisitions

Customs liabilities frequently survive corporate acquisitions.

Potential inherited risks include:

• Historical customs violations
• Ongoing audits
• Penalty assessments
• Classification disputes
• Valuation disputes
• Origin-related liabilities

Failure to identify these risks before closing may significantly affect transaction value.

For this reason, customs due diligence should be integrated into every merger and acquisition process involving businesses engaged in international trade.

Red Flags During Customs Due Diligence

Certain findings should immediately attract investor attention.

Examples include:

• Ongoing customs investigations
• Significant customs penalties
• Unresolved valuation disputes
• Incomplete documentation
• Weak compliance systems
• Repeated audit findings
• Incentive compliance concerns

The presence of these issues does not necessarily prevent an investment.

However, they should influence transaction structure, valuation, indemnity provisions, and post-closing compliance planning.

Building a Post-Investment Compliance Strategy

Customs due diligence should not end when the transaction closes.

Investors should develop a post-acquisition compliance strategy addressing:

• Risk remediation
• Policy updates
• Employee training
• Internal audits
• Documentation improvements
• Governance enhancements

Strengthening customs compliance after acquisition helps reduce future liabilities and supports long-term business growth.

A proactive approach generally produces the most favorable outcomes.

Frequently Asked Questions (FAQ)

1. What is customs due diligence?

Customs due diligence is the process of evaluating a company’s customs compliance history, risks, and liabilities before completing an investment transaction.

2. Why is customs due diligence important?

Because customs liabilities may remain hidden until discovered during audits or investigations and can significantly affect investment value.

3. Which companies require customs due diligence?

Any company involved in imports, exports, manufacturing, logistics, international trade, or customs incentive programs should undergo customs due diligence.

4. What are the most common customs risks?

Classification errors, valuation disputes, origin issues, documentation deficiencies, and incentive compliance problems.

5. Can customs liabilities survive an acquisition?

Yes. Historical customs liabilities often remain enforceable after a corporate acquisition.

6. Why are related-party transactions important?

Because customs authorities frequently examine related-party pricing arrangements during valuation reviews.

7. How does origin compliance affect investors?

Improper origin claims may result in retroactive duties, penalties, and interest assessments.

8. Should customs audits be reviewed during due diligence?

Yes. Audit history provides valuable insight into a company’s compliance culture and potential liabilities.

9. What role do customs incentives play in due diligence?

Investors should verify that all incentive-related obligations have been satisfied to avoid future enforcement actions.

10. When should a foreign investor consult a customs lawyer?

Before acquisitions, mergers, major investments, joint ventures, or whenever customs-related risks are identified.

Legal Support for Customs Due Diligence and Foreign Investments

Customs due diligence is an essential component of successful investment planning in Turkey. A thorough review of customs compliance practices, historical liabilities, audit exposure, and regulatory obligations can help investors avoid costly surprises and make informed business decisions.

Professional legal guidance can assist investors in identifying customs risks, structuring transactions appropriately, negotiating protections, and developing effective post-investment compliance strategies.

Contact Our Customs and International Trade Law Team

Phone: +90 312 434 22 22

Mobile / WhatsApp: +90 532 769 22 22

E-mail: info@firatfesihkaya.av.tr

Office Address: Mevlana Boulevard No:221, Yildirim Tower, Unit 148, 06520 Balgat, Cankaya, Ankara, Turkey

FFK Partner Law Firm provides legal assistance to foreign investors, multinational corporations, private equity funds, manufacturers, logistics providers, exporters, importers, and international businesses regarding customs due diligence, customs compliance, customs audits, mergers and acquisitions, investment incentives, and international trade law matters throughout Turkey.