Basic Law 7/2012, passed by the Spanish Parliament on December 27th 2012, has substantially changed the regulation of tax fraud in the Spanish Criminal Code. Among other things, this Act of Parliament has changed the legal nature and requirements of the defence of regularization, has introduced new aggravating circumstances that widen the statute of limitations to ten years, and has provided the Spanish Tax Authorities with new tools that intend to ease the prosecution of these crimes. This paper studies in detail all the changes brought by Basic Law 7/2012, analyzing them in the context of the changes both in statutory and case law that have taken place in the last twenty years, and describes the practical problems that may arise when the new regulation is enforced. The conclusion of this analysis is that the reform enacted in Basic Law 7/2012 is another step in the criminalization of breaches of tax rules, sets inconsistent criteria that generally play against taxpayers and increases legal uncertainty. All this entails a significant increase in the legal and compliance risks that corporations doing business in Spain must face. [ABSTRACT FROM AUTHOR]