From Tax Audit to the Mutual Agreement Procedure (MAP): Understanding the Interaction Between Primary Adjustments, Corresponding Adjustments and Treaty-Based Remedies

By Khalil HALOUI
CEO and Founder, KH Global Tax Advisory
4 September 2026 

Introduction: The Partner’s Perspective

In a global tax environment characterized by increased transparency and an unprecedented requirement to substantiate economic substance, transfer pricing has become a major catalyst for cross-border tax disputes. For tax and finance departments, receiving a transfer pricing reassessment notice goes beyond a simple challenge to a tax optimization arrangement: it crystallizes a significant operational risk, namely economic double taxation.

When a tax authority unilaterally increases the taxable base of a local subsidiary, the corresponding profit has often already been taxed at the level of another group entity in another jurisdiction. Without coordinated international resolution, the same economic flow is subject to direct taxation twice, undermining profitability, putting pressure on cash flow and weakening the legal certainty of transactions.

Faced with these challenges, a purely defensive or strictly local approach quickly reaches its limits. Effective management of international disputes requires a global perspective, combining command of domestic litigation with the strategic use of treaty-based mechanisms, foremost among them the Mutual Agreement Procedure (MAP).

The purpose of this article is to provide you with an operational framework for managing the process, from the initial tax audit through to the final resolution of the dispute, while safeguarding your group’s financial interests.

1. Tax Audit and Transfer Pricing Adjustment: The Starting Point of the Dispute

1.1. How the Risk Materializes During a Tax Audit

A transfer pricing tax audit almost systematically begins with a critical review of the mandatory documentation (Master File and Local File). The tax auditor seeks to identify any divergence between the policy presented by the group and the actual allocation of risks, assets and functions within the domestic jurisdiction.

The areas most commonly challenged by the tax authority generally include:

• The justification of remuneration for intragroup services (management fees), intellectual property royalties and sales commissions;
• The compliance of the operating margin achieved by limited-risk distributors or manufacturers;
  
• The rate and substance conditions applicable to intragroup financing.

1.2. Characterization of the Primary Adjustment

During a tax audit, transfer pricing analysis is frequently one of the first areas considered for reassessment. Where the tax auditor considers that a cross-border intragroup transaction does not comply with the arm’s length principle, the financial terms applied to the transaction are adjusted.

In practical terms, the tax auditor adds back to the taxable income of the audited company the profits that, in the auditor’s view, were improperly transferred abroad, whether through understated revenue or overstated expenses. This increase in the taxable base in the jurisdiction of the audited entity constitutes what international tax doctrine refers to as a primary adjustment.

Although this adjustment enables the State to restore its tax base, it immediately creates a major imbalance for the group: the same profit is taxed twice — first at the level of the related counterparty and a second time through the reassessment made by the tax auditor. It is precisely the emergence of this economic double taxation that makes corrective mechanisms essential.

Practical Example: The Limited-Risk Distributor Case

• Context: Subsidiary A (located in State A) acts as the exclusive distributor of products manufactured by its parent company, Company B (located in State B).
  
• Initial situation: Subsidiary A generates revenue of MAD 10,000,000 and applies a transfer price that leaves it with an operating margin of 1.5% (i.e., MAD 150,000).
  
• Tax auditor’s adjustment: During the tax audit, the auditor in State A rejects the group’s benchmarking study and, based on the auditor’s own set of comparables, concludes that the arm’s length margin should have been 4.5% (i.e., MAD 450,000).
• Consequence: State A issues a primary adjustment of MAD 300,000 to Subsidiary A’s taxable income, together with additional corporate income tax, penalties and late-payment interest.
  

2. Why Does an Adjustment Create Economic Double Taxation?

2.1. Distinguishing Legal Double Taxation from Economic Double Taxation

It is essential to distinguish between two concepts that are often confused:

• Legal double taxation: The same taxpayer is taxed on the same income by two different States.
• Economic double taxation: Two separate but related legal entities (for example, a parent company and its subsidiary) are taxed on the same economic profit by two different jurisdictions.

2.2. The Mechanism of the Double Tax Burden

The primary adjustment creates an immediate imbalance. In the previous example, the MAD 300,000 added back by State A to Subsidiary A’s taxable income has already been recognized as taxable income and taxed at the level of Company B in State B.

Unless subsequently corrected, the group’s overall tax burden in respect of this transaction is imposed twice on the same portion of profit. In addition, this adjustment is frequently accompanied, in particular, by withholding taxes – TPA – on profits deemed to have been distributed (secondary adjustments), further increasing the financial impact of the reassessment.

3. Primary Adjustment and Corresponding Adjustment: How Do They Interact?

3.1. The Principle of Symmetrical Correction

To neutralize the economic double taxation generated by a tax reassessment, the international tax framework relies on the inseparable complementarity between the primary adjustment and the corresponding adjustment, under the principle of symmetrical correction.

This mechanism operates like a mirror between the two jurisdictions concerned:

• Primary Adjustment (State A): The tax auditor in State A increases the taxable base of the audited entity by adding back the profit that the auditor considers to have been abnormally transferred.
  
• Corresponding Adjustment (State B): In response, the tax authority in State B makes an equivalent reduction to the taxable base of the related counterparty (or grants it a corresponding tax credit).
  

By reducing the taxable base in the second State by the amount of the increase made in the first, the symmetrical correction restores the initial tax neutrality and ensures that the group’s value chain (or economic profit) is not subject to undue over-taxation.

3.2. The Obstacle of the Other State’s Consent

A corresponding adjustment is never automatic. The tax authority in State B will not agree to reduce its own tax base — and therefore forgo tax revenue — solely on the basis of a unilateral decision taken by the tax auditor in State A.

State B will grant the corresponding adjustment only:

1. If it considers that the adjustment made by State A is justified in both principle and amount under the arm’s length principle; or
2. If a formal agreement is reached between the two States following a Mutual Agreement Procedure.

4. Domestic Remedies: Should the Reassessment Be Challenged in the Source State?

4.1. The Importance of Local Remedies

Upon receipt of the proposed reassessment, the natural response is to initiate domestic dispute procedures: responding to the tax auditor’s observations, pursuing hierarchical review, referring the matter to local administrative commissions, and ultimately challenging the reassessment before the administrative courts.

This route is essential for raising procedural defects, errors in factual assessment or failures to comply with local procedural safeguards.

4.2. The Limits of Local Litigation in an International Context

However, domestic remedies have a fundamental limitation: the local administrative court assesses the legality of the reassessment under domestic law and the bilateral tax treaty, but it has no power to compel the foreign tax authority to grant a corresponding adjustment.

Moreover, pursuing domestic litigation through to a final judgment may, in some jurisdictions, restrict the room for manoeuvre of the Competent Authorities in a subsequent mutual agreement negotiation, or even render a MAP request inadmissible if an irrevocable court decision has been issued.

5. The Mutual Agreement Procedure (MAP): Treaty Basis and Conditions for Access

5.1. The Legal Framework of Article 25 of the OECD Model

The Mutual Agreement Procedure (MAP) is a dispute resolution mechanism provided for under Article 25 of bilateral tax treaties based on the OECD or UN Model. It allows enterprises subject to taxation that is not in accordance with the provisions of the treaty to request the direct intervention of the Competent Authorities of the States concerned.

5.2. Admissibility Requirements

For a MAP request to be admissible, several criteria must be strictly observed:

1. Existence of an appropriate bilateral treaty: The two States must be bound by a tax treaty containing a mutual agreement procedure provision applicable to transfer pricing (based on Article 25).
   
2. Official notification of the grievance: The disputed taxation must have been formally notified (for example, through a tax reassessment notice).
   
3. Strict compliance with treaty time limits: The request must be submitted within the period prescribed by the treaty, most often three years from the first notification of the measure resulting in taxation not in accordance with the treaty.
   

6. How to Prepare an Effective MAP Request?

A MAP request should not be treated as a simple administrative letter, but rather as a highly technical international tax dispute memorandum.

6.1. Structure of the Strategic File

An effective submission should be structured around four essential components:

• Factual and Economic Component: A detailed presentation of the group’s value chain, demonstrating the actual operational role of each entity, the underlying intangible assets and an updated functional analysis.
  
• Legal and Treaty Component: A technical analysis demonstrating how the tax auditor’s adjustment conflicts with Article 9 (Associated Enterprises) of the bilateral treaty.
  
• Transfer Pricing Documentation Component: Full submission of the Master File and Local File, together with a methodological critique of the benchmarking study used by the tax auditor.
  
• Financial Component: Precise modelling of the exact amount of the reassessment, the double-taxation impact and the exact amount of the corresponding adjustment requested.
  

7. MAP, Negotiation Between Competent Authorities and Securing the Group’s Tax Position

7.1. Conduct of State-to-State Negotiations

Once the request has been deemed admissible, negotiations take place directly between the Competent Authorities of the two countries (generally represented by the international tax affairs departments of their respective Ministries of Finance).

This phase takes place separately from the initial tax auditor, making it possible to move beyond the constraints of the field audit and adopt a pragmatic dispute-resolution approach.

7.2. Outcome of the Procedure and Long-Term Security of the Position

The negotiation may result in two types of resolution:

• Total or partial withdrawal of the primary adjustment by the State of the audited entity.
  
• Granting of the corresponding adjustment by the State of the counterparty, thereby eliminating the double taxation.
  

A MAP agreement offers a dual benefit: it resolves the past and secures the future. The methodology validated by the Competent Authorities may serve as a reference for subsequent financial years and pave the way for a bilateral or multilateral Advance Pricing Agreement (APA).

General Conclusion: Why Anticipation and Tailored Support Make the Difference

Managing transfer pricing disputes leaves no room for improvisation or isolated approaches. Faced with tax authorities that are increasingly well equipped and internationally coordinated, protecting your interests requires perfect synergy between rigorous command of local dispute procedures and strategic negotiation of international agreements.

This is precisely where the distinctive strength of KH Global Tax Advisory comes into play.

Founded and led by Khalil Haloui, Doctor of Private Law and former Head of the Tax Audit Department within the General Directorate of Taxes, our firm combines an intimate understanding of the mindset, methods and doctrines of the tax administration with cutting-edge expertise in international tax engineering.

This dual culture — administrative and international — enables us to:

• Accurately anticipate the position and likely angles of challenge adopted by tax auditors during on-site audits;
• Remedy procedural defects and secure the procedural position of your local subsidiaries;
  
• Structure MAP submissions with surgical precision, immediately usable by the Competent Authorities to unlock the corresponding adjustment and definitively eliminate any double taxation.
  

By entrusting the defence of your transfer pricing positions to KH Global Tax Advisory, you do more than simply react to a tax audit: you gain a strategic advantage, protect your cross-border flows and sustainably secure your group’s financial profitability.