The supranational and, in particular, European legislation impose the inclusion of tax evasion among the predicate offences of the money laundering and urge the introduction of the offence of self-laundering. Despite these inputs, the criminalization of self-laundering is problematic in terms of respect of the rule of law. In this perspective, the article highlights the difficulty of considering, in comparative law, the proceeds of tax evasion as a criminal profit which can be laundered, as well as the problems posed by the criminalization of self-laundering of this tax saving with respect to the principles of both ne bis in idem and proportionality. Subsequently, the article will focus on the aims of criminalizing the act of self-laundering, and also in this perspective the link emerges with tax evasion, before evaluating the necessity of such a tool in the broader armamentarium available today in the fight against the accumulation of illicit capital.