The international convention on terrorist financing and Western-backed international organizations have found the financing of terrorism serious enough to criminalize it as an independent offence. While the offence has a preparatory nature, its criminalization as an independent offence expands the boundary of criminal liability beyond existing notions of criminalization. This paper aims at examining the justifiability of the terrorist financing offence with regard to the principles and values on which liberal criminal law is based. Liberal criminal law has been chosen because the idea of the criminalization of terrorist financing was issued and developed mainly by Western liberal states. The paper narrowly discusses the issue in the context of Anglo-American criminal law.