The tax practices of multinational corporations have become a matter of significant public and political concern. The underlying issues are rooted in the capacity of MNCs to construct organizational circuits that enable taxes to be minimised in (ambiguously) legal ways. This is tax avoidance. Organizational circuits are one example of what Seabrooke and Wigan refer to as global wealth chains. The capacity to avoid tax arises because of the way MNCs are treated as a series of separate entities, subject to the arm's length principle. Unitary taxation based on formula apportionment provides a potential solution to the problems. This paper provides an overview of how tax avoidance is achieved, the problems that arise from this, and the benefits of unitary taxation as an alternative, and places this in the context of current policy trends. The purpose of the paper is to improve awareness amongst a politically literate academic readership of key issues for the main alternative to the current problematic situation.