The recent publication of the guidelines for the State Tax Administration Agency’s (AEAT) Tax Audit Plan for fiscal year 2026 not only establishes the administration’s priorities but also consolidates a paradigm shift in the relationship between the tax authorities and taxpayers. Beyond a list of sectors to be audited, the document outlines three key areas of control that will require unprecedented technical robustness: auditing based on big data processing, scrutiny of economic substance in international structures, and strict oversight of the valuation of intangibles and intra-group financial transactions.
1. “Algorithmic auditing”: the end of information asymmetry
One of the most disruptive pillars of the 2026 Plan is the integration of predictive models and artificial intelligence tools for detecting risk profiles. The administration no longer relies on random audits but on an automated comparative analysis of information obtained through automatic exchange mechanisms (CRS and CbC Reporting).
This systemic approach seeks to identify discrepancies between the profits reported by multinational groups and the global distribution of their assets and personnel. For companies, this means that the consistency of data reported across different jurisdictions is now the first survival filter in the face of an audit. A numerical discrepancy between a subsidiary’s Local File and the Country-by-Country Report (CbC) will almost inevitably trigger an audit order.
Likewise, administrative cooperation mechanisms are being strengthened, including joint inspections and multilateral controls among tax administrations.
2. Economic substance: substance over form
The 2026 Plan places special emphasis on combating structures that lack “relevant economic substance.” The tax authority has indicated that the mere formal existence of intra-group contracts or tax residency in favorable tax jurisdictions will not suffice.
- Shared service entities and holding companies: It will be examined whether these entities have the necessary material and human resources for strategic decision-making.
- Reassessment of functions: The focus shifts from mere formal compliance to identifying where value is actually generated. If a local entity reports minimal margins under a “low-risk” classification but de facto assumes critical management functions, the administration will proceed to reclassify or recharacterize the transaction and make the corresponding adjustments to the tax base.
3. Intangible assets and financial transactions: the new areas of friction
The valuation of intangibles and the deductibility of intragroup financial expenses remain highly litigious areas. The 2026 Control Plan introduces additional rigor in the analysis of financial transactions, requiring the borrowing entity to demonstrate not only the need for the loan but also its borrowing capacity from a market perspective (solvency analysis or credit rating).
Regarding intangibles, the tax authorities will strictly apply the DEMPE approach (Development, Improvement, Maintenance, Protection, and Exploitation). The right to remuneration for an intangible asset no longer follows exclusively from legal ownership but from the performance of the aforementioned functions.
4. The Burden of Proof and the Documentation Standard
Following the trend of international higher courts, the 2026 Plan raises the standard required for Transfer Pricing documentation. It is no longer considered a mere compliance requirement, but rather an evidentiary tool for defense.
The tax administration has warned that it will reject comparability analyses based on mechanical filters or outdated databases. A detailed economic analysis is expected to justify why the selected comparables accurately reflect arm’s-length conditions in the specific market context of 2026.
Strategic Implications and Risk Management
The nature of the 2026 Audit Plan suggests that the technical defense must be built proactively. Improvising in response to a request for information can result in significant tax adjustments, late payment interest, and penalties for lack of substance.
The lesson for financial and tax management is clear: consistency between contractual policy, operational reality, and the economic rationale for transfer pricing must be verifiable in real time. Any gap between these elements will be detected by the authority’s new control systems.
Technical consistency as the cornerstone of tax stability
In this environment of precision auditing, engaging a firm specializing in transfer pricing is a key risk management measure. At TPC Group, we integrate legal analysis with economic soundness to ensure that our clients’ intra-group policies not only comply with regulations but are also technically defensible against the most rigorous administrative scrutiny.
If your organization operates in a multinational environment and seeks to strengthen its compliance strategy in light of the new guidelines of the 2026 Plan, the time to act is now. A structured and proactive approach is the only guarantee for mitigating contingencies and preserving the legal certainty of your business in the global environment.
Source: Cuatrecasas