In this paper, we investigate devolution in the Northern Irish context. The role of institutional geography is highlighted. Both contemporary and historical (c. 1921–1972) devolution models are discussed. It is argued that institutional factors provide explanations for economic weaknesses found under both devolution models. The evidence presented suggests that the institutional geography has both changed and exhibited continuities and we discuss these features in relation to contemporary issues. In particular, it is argued that institutional geography considerations have shaped the creation of the current review of tax devolution as well as the creation of an independent fiscal council.