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A large part of border crossing investment takes the form of international mergers and acquisitions. In this article, we ask how optimal repatriation tax systems look like in a world where investment involves a change of ownership, instead of a reallocation of real capital. We find that the standard results of international taxation do not carry over to the case of international mergers and acquisitions. The deduction system is no longer optimal from a national perspective and the foreign tax credit system fails to ensure global optimality. The tax exemption system is optimal if ownership advantage is a public good within the multinational firm. However, the cross-border cash-flow tax system dominates the exemption system in terms of optimality properties.