Master File and Local File – Five Mistakes That Increase the Risk of an Audit

July 1, 2026

Transfer Pricing documentation has become one of the main areas of analysis for tax authorities in Latin America. Against a backdrop of increased information exchange, risk-based auditing, and the adoption of international standards, the quality of the Master File and the Local File goes beyond mere formal compliance to become a key defense tool in the event of an audit.

Action 13 of the Organization for Economic Cooperation and Development (OECD)’s BEPS Action Plan established an international standard for Transfer Pricing documentation that has now been adopted by most jurisdictions in the region. However, many companies continue to make mistakes that can significantly increase their exposure to tax adjustments, penalties, and disputes with tax authorities.

  1. Inconsistencies Between the Master File and the Local File

One of the most common mistakes is submitting information that is inconsistent between the two documents.

The Master File provides an overview of the multinational group, while the Local File analyzes the specific operations of each entity. When there are inconsistencies between the information contained in these two documents, tax authorities may question the consistency and reliability of the submitted documentation, increasing the risk of adjustments, requests for additional information, or a more thorough audit.

Thus, maintaining a consistent and aligned narrative between both reports is essential to strengthen the credibility of the documentation and reduce exposure to challenges during an audit.

  1. Outdated Functional Analysis

Business models are constantly evolving. Changes in organizational structure, new lines of business, corporate reorganizations, or modifications in risk allocation can cause a functional analysis prepared years ago to no longer reflect the company’s current economic reality.

For this reason, periodically updating the functional analysis allows for the accurate identification of each entity’s functions, assets, and risks—an essential aspect for understanding the economic reality of operations, selecting the appropriate method, supporting the comparability assessment, and ensuring the consistency of the Transfer Pricing analysis.

  1. Comparability Studies with Insufficient Information

The selection of comparable companies is one of the most sensitive aspects of a Transfer Pricing study.

The use of outdated databases, the application of inconsistent search criteria, or failing to adequately justify the selection of comparables can significantly weaken the robustness of the economic analysis and the taxpayer’s technical defense in the event of an audit.

In this context, tax authorities in the region are increasingly relying on their own analytical tools and databases, which underscores the importance of having a consistent, well-documented, and technically robust comparability analysis.

  1. Documentation Prepared Solely to Meet a Formal Obligation

In many organizations, documentation is prepared solely to meet a legal requirement at the end of the fiscal year.

However, international best practices recommend integrating Transfer Pricing documentation into the tax risk management strategy. This involves periodically reviewing internal policies, validating financial results throughout the year, and documenting decisions related to related-party transactions in a timely manner.

Documentation prepared proactively typically provides a more robust response to tax audits.

  1. Lack of evidence supporting intragroup transactions

Beyond economic analysis, tax authorities assess whether there is sufficient evidence to demonstrate the reality of the transactions.

Contracts, supporting studies, documentation of services received, internal policies, financial analyses, and other evidentiary elements constitute an essential part of the technical file.

When this information is insufficient or inconsistent, the risk of challenges increases, especially in transactions involving intra-group services, financing, intangible asset licenses, and corporate reorganizations.

Documentation as a Risk Management Tool

Recent trends in Latin America show that tax authorities are strengthening their audit processes through data analysis tools, profitability indicators, and the international exchange of information.

In this context, having technically sound Master Files and Local Files not only facilitates compliance with formal Transfer Pricing documentation requirements but also reduces the likelihood of adjustments and disputes.

Transfer Pricing documentation should be understood as a strategic tool that allows companies to demonstrate the economic consistency of transactions between related parties and anticipate potential risks prior to an audit.

Preparing the Master File and Local File represents much more than a mere documentation requirement. It constitutes one of the primary mechanisms for supporting the analysis that underpins compliance with the arm’s-length principle and for strengthening the taxpayer’s position in the face of an increasingly sophisticated tax audit environment.

Periodically reviewing the documentation, updating functional analyses, strengthening comparability studies, and maintaining sufficient evidence of intragroup transactions will enable companies to more confidently address the challenges posed by tax authorities in Latin America.

At TPC Group, we have a team specializing in Transfer Pricing that advises domestic and multinational companies on the preparation of Master Files, Local Files, and Country-by-Country Reports (CbCR), as well as comparability studies, economic analyses, and compliance strategies, helping to reduce risks and strengthen technical defenses against tax audits throughout Latin America.

Source:

OECD Country-by-Country

OECD

 

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