Founders, senior staff and members of the McCarthy family as well as their Fexco business are reaping the full benefit of the $200 million sale of Taxamo announced on Thursday. US-based Vertex has acquired the cross-border tax automation software firm, headquartered in Killorglin, Co Kerry just like Fexco, in an all-cash transaction equivalent to €165 million that closed this week. So where is this money going? Taxamo comprises several companies owned through Evat Solutions Ltd. Their balance sheets established at the end of 2020 showed that they had no significant liabilities to any third parties.  Other than normal ongoing trading…