“…By examining a potential determinant of crosssectional variation in tax planning practices among firms, we follow the calls for contributions to the understanding of this matter (Cen et al, 2018;Dyreng and Maydew, 2017;Wilson, 2009). Recent research has turned to cross-firm connections, analyzing board ties (Brown, 2011;Brown and Drake, 2014), banks (Gallemore, Gipper, and Maydew, 2018), human capital turnover (Barrios and Gallemore, 2018), auditors (Frey, 2018;Lim et al, 2018) and the supply chain (Cen et al, 2017(Cen et al, , 2018. We extend this literature by analyzing the role of strategic alliances in tax knowledge diffusion.…”