The purpose of this brief is to correct and respond to two arguments in Petitioner-Appellee Altera's petition for rehearing en banc and briefs of amici supporting the petition for rehearing. First, Treasury's regulation requiring cost sharing of stock-based compensation and the Ninth Circuit...

In this article, we respond to Professor Zelinsky's criticism of our arguments regarding the constitutionality of New York's tax residence rule. We argue that the Supreme Court's decision in Wynne requires reconsideration of the New York Court of Appeal's decision in Tamagni

This Essay argues that EU taxpayers may challenge digital services taxes as violations of EU law. Specifically, because they exempt all but the very largest companies, which are disproportionately foreign, DSTs result in nationality discrimination as applied. As part of our analysis of the...

In this report, the second in a series of reports on EU state aid, Mason evaluates the claims Treasury' made in its White Paper that recovery in the recent tax ruling cases would violate taxpayers' legitimate expectations that those rulings did not constitute state aid

In this report, the first in a series of reports on EU state aid, Mason provides background on state aid law as it applies to income taxes, including the legal standard, recovery mechanism, and case selection by the Commission

The Treasury regulations at issue in Altera Corp. v. Commissioner condition the validity of controlled taxpayers' income allocation under a cost-sharing agreement upon the requirement that the controlled parties share all costs, including stock-based compensation costs, proportionately with the...

Philadelphia has a complex and antiquated tax system that has long been criticized for driving employers and jobs away from Philadelphia by making it expensive to conduct business in the City. The centerpiece of the Philadelphia tax system is the Philadelphia wage tax, which raised more than...