© 2017 Western Economic Association International We construct a model of corporate tax competition in which governments also use public infrastructure investment to attract foreign direct investment, thus enhancing their tax bases. In doing so, we allow for cross-border infrastructural externalities. Depending on the externality, governments are shown to strategically over- or underinvest in infrastructure. We also examine how tax cooperation influences investment in infrastructure and find that welfare may be lower under tax cooperation than under tax competition; this is the case when infrastructure is very effective in raising the tax base and generates a large negative cross-border externality. (JEL F23, H40).