An ongoing research discussion focuses on the extent to which tax treaties, or double taxation agreements, are capable of accomplishing one of their stated objectives, that is, providing support for cross-border investment. While this discussion currently lacks a conclusive outcome, it has been established that tax treaties lead to lower withholding tax rates on dividends and interest payments. This practice lowers government revenues from such taxes worldwide. Although there are now over 3,000 bilateral tax treaties, little is known about the scale of potential tax revenue foregone associated with the lower taxation they facilitate. Furthermore, what little we know is mostly based on static estimates, which unrealistically assume that tax treaties themselves do not influence dividends and interest payments. In this paper, we overturn this assumption by estimating the extent to which dividend and interest flows react to changes in withholding rates, and reflect these elasticities in new estimates of potential tax revenue foregone.