No. 241: Tax Department Workforce Heterogeneity and Tax Planning

This study examines whether and how workforce heterogeneity within corporate tax departments shapes firms’ tax planning. Using employee-level data for U.S. firms from 1993 to 2024, we document a substantial increase in heterogeneity over time. In multivariate analyses, we find no robust association between overall tax department heterogeneity and firms’ tax planning. However, this result masks important differences across underlying dimensions of heterogeneity. Specifically, cognitive heterogeneity, capturing variation in education, experience, tenure, and seniority, is positively associated with tax planning, whereas demographic heterogeneity, capturing variation in gender and ethnicity, exhibits a negative association. Additional analyses suggest that cognitively heterogeneous tax departments identify more sophisticated tax planning opportunities, utilize tax-related inputs more effectively, and maintain more stable tax strategies. In contrast, demographic heterogeneity is associated with greater variability in tax outcomes. Overall, these findings highlight a trade-off between the informational benefits and coordination costs of workforce heterogeneity within corporate tax departments.