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The rules for how the aviation industry splits its profits across state lines are getting a major overhaul today. At 3:00 p.m. ET today, March 24, 2026, the Multistate Tax Commission (MTC) will convene a critical public hearing via Zoom to discuss the proposed revisions to $Regulation IV.18.c$. This isn’t just a technical tweak; it’s a fundamental shift in Airline Income Apportionment that will dictate how much tax multibillion-dollar aviation MNCs owe to individual U.S. states.
For decades, the “Special Industry Rule for Airlines” has governed the complex math of dividing revenue based on flight miles, ground time, and departures. However, as the industry evolves with new logistics models and digital integration, the MTC argues that the old model no longer reflects economic reality. The proposed changes in Airline Income Apportionment aim to modernize these formulas, potentially shifting tax liabilities significantly between “hub” states and those with higher flight frequencies. For multistate businesses, this means their 2026 tax projections could be up in the air until this model regulation is finalized.
Today’s hearing is the final public forum for industry stakeholders to voice their concerns before the MTC moves toward a formal recommendation. With trillions of passenger miles and billions in cargo revenue at stake, the debate over Airline Income Apportionment is a high-stakes tug-of-war between state treasuries and corporate tax departments. If your organization has wings—or even just a significant stake in aviation logistics—this 3:00 p.m. Zoom call is the most important “flight” you’ll track all year.
