Tax avoidance schemes in transfer pricing and international tax law refer to structured arrangements that, while nominally compliant with applicable statutes, are designed principally to erode the tax base or shift profits in a manner inconsistent with the arm’s length standard or the economic substance of the transactions involved. The legal foundation for challenging such arrangements rests on domestic general anti-avoidance rules (GAARs), treaty abuse provisions under Article 9 and the preamble to the OECD Model Tax Convention, and increasingly on the concept of fraus legis or abuse of law recognised in civil law jurisdictions such as the Netherlands and Luxembourg. Disputes frequently arise where tax authorities contend that the legal form of a transaction has been manipulated to achieve fiscal outcomes that independent parties would not have accepted.

In practice, these disputes typically involve layered holding structures, hybrid instruments, and intragroup financing arrangements designed to exploit mismatches between jurisdictions. Private equity acquisition structures channelling debt through entities in low-tax jurisdictions — as in the Dutch cases involving Hunkemöller and X B.V. — raise questions about whether interest deductions reflect genuine commercial arrangements or engineered deduction/no-inclusion outcomes. Transfer pricing disputes such as Cameco involve long-term commodity supply contracts between related parties that the tax authority characterises as a mechanism for stripping profits from the jurisdiction where the economic activity occurs. State aid cases such as Starbucks examine whether advance pricing arrangements blessed by national authorities themselves constitute a form of sanctioned avoidance.

The governing OECD framework addresses tax avoidance in several dimensions. The 2022 OECD Transfer Pricing Guidelines, Chapter I (paras 1.119–1.131) set out the accurate delineation standard requiring that actual substance, rather than contractual form, determine the characterisation of transactions. The BEPS Action 6 Report and the Multilateral Instrument introduced the principal purpose test to deny treaty benefits where one of the principal purposes of an arrangement is to obtain those benefits. Domestic implementation of BEPS Action 4 targets interest limitation rules, directly relevant to leveraged acquisition structures. EU Member States are additionally subject to the Anti-Tax Avoidance Directives (ATAD I and II), which harmonise interest limitation, exit taxation, and hybrid mismatch rules.

Courts examine whether the arrangement has genuine economic substance, whether independent parties would have entered equivalent transactions, and whether the taxpayer can demonstrate a non-tax business rationale. The burden of proof on substance typically shifts to the taxpayer once the authority identifies the abusive character of the arrangement. Methodological questions centre on whether the delineated transaction should be disregarded or recharacterised entirely.

These cases collectively demonstrate that the boundary between legitimate tax planning and abusive avoidance remains intensely contested, making this category indispensable for practitioners advising on cross-border structures or defending assessments involving substance challenges.