The Roundable this month examines in detail the Finance Bill, and matters arising in last month’s Budget speech, such as the signalled review signalled by Minister Paschal Donohoe of the Irish Government's 2018 Corporation Tax Roadmap. But it has been an important month also internationally, with the US heading towards a regime change that is certain to impact Irish-US corporation tax relationships, Cayman Islands coming off the Annex 1 List of the EU, and, in an important 155 page judicial review issued in the High Court, a judgement on the Perrigo-Tysabri case that brings important, home grown, issues to bear concerning the Irish corporation tax regime.