Since 2008, we have observed a more prominent role of the state in economic life, with the widespread use of financial tools. Advancing discussions on the financialization of distributional politics, the expansion of financial statecraft as a result of fiscal conflicts, and the fragmentation of state power, this article explores how proliferating financial policies reconfigure the state and its relationship with the economy as well as its democratic foundations. I introduce the concept of financial security states to theorize reactions to mature financialization and its inherent instabilities, which provoke socially structured demands for public stabilization. Leveraging the tradition of fiscal sociology, I work out differences between taxation and welfare systems and those based on financial security. In particular, I show that financial security states exploit value uncertainties to postpone loss-reckoning, are carried by hybrid state-banking institutions, and leverage the states’ endogenous power within market-based finance. This article argues that the by-and-large regressive distributional outcomes and fiscal costs of financial policies remain opaque, due to strategic obfuscation, the failure of traditional modes of political mediation, and deficient budgeting procedures.