Board Thread:Discussions/@comment-32600226-20190409175558/@comment-32600226-20190425070818

Corruption of Tau by Chaos is extremely unlikely given how they only have a very small connection to the warp (in Dawn of War Dark Crusade the chaos stronghold mission had Eliphas using telepathy to taunt your commander but the Tau commander only hears static). That said I'm pretty sure anything with any soul at all can be corrupted, but it's more likely that the other races allied with the Tau would be corrupted such as the Kroot.