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Andrew D. Appleby, Formulary Apportionment: A New Framework for Personal Income Taxation, 52 Pepp. L. Rev. (2025)Clicking on the button will copy the full recommended citation.
The prevalence of post-pandemic remote working arrangements and increased interstate migration have upended existing personal income taxation regimes. For decades, the current paradigm proved to be an imperfect but workable means to determine which state has the prevailing claim to impose tax on a particular item of income. The individual’s state of residence has a residual claim to all the individual’s worldwide income, but defers to the state in which the income is derived if such a state is determinable. To that end, the state of residence typically provides a credit for income taxes paid on a source basis to other states. Fundamentally, source trumps residence in the context of personal income taxation.
The problem is that taxing jurisdictions can no longer readily determine the source of income or the individual’s state of residence within the existing legal constructs. Existing legal structures designed to tax employment income cannot cope with widespread remote working arrangements. The rise of the digital economy and independent contractor “gig work” allows individuals to shift the source of their income. At the same time, individuals are also shifting their state of residence from high-tax to low-tax states at historic rates. Increased interstate migration, particularly of high-net-worth individuals and profitable closely-held businesses, has allowed income to migrate with individuals. The result is a genuine threat of multiple taxation for individuals and significant revenue losses for taxing jurisdictions. The stakes are enormous, as personal income tax regimes account for approximately one-quarter of all state and local tax revenues.
The solution—formulary apportionment—is a concept with which states are very familiar. Although formulary apportionment has been the prevailing paradigm for multistate corporate income taxation for decades, state legislatures and the existing literature have largely and surprisingly failed to recognize the promise of formulary apportionment for multistate personal income taxation. This Article remedies that oversight.