On 30 April 2025, Law 3/2025 of 29 April was published in the Official State Gazette, amending Law 12/2002 of 23 May, which governs the Economic Agreement with the Autonomous Community of the Basque Country. This reform aligns the Agreement with recent developments in the national tax system, especially following the enactment of Law 7/2024, and introduces significant changes in taxation, tax management, and inter-administrative cooperation.

Among the most relevant changes, the Agreement now incorporates the Complementary Tax to ensure a global minimum level of taxation for large multinational and national groups, in compliance with Directive (EU) 2022/2523. It also includes the Tax on the Net Interest and Commission Margin of certain financial institutions and the Tax on Liquids for Electronic Cigarettes and Other Tobacco-Related Products.

Additionally, one of the key aspects of the reform is the update of the turnover threshold, which is increased from EUR 10 million to EUR 12 million. This threshold is used to determine the applicable regulations (foral or national), the competent tax authority, and the attribution of audit powers.

This new threshold will apply, as of 1 January 2026, to the following taxes: