This study contributes to debates on the efficacy of institutions in settler colonies by comparing the Cape Colony’s fiscal path to the experiences of Australia, New Zealand, and Canada. I find that the Cape’s fiscal trajectory was divergent. Agricultural and mining taxes were important surrogates of income taxes in other colonies, but the Cape’s narrow interests pushed for insulation from direct taxes. This made the Cape’s fiscal path unsustainable with comparatively low per capita taxes, high deficits, and the highest level of indebtedness. I argue that the instrumentality of ‘‘responsible government” status was conditional on how imported self-government institutions were endogenized.</jats:p>