 In December 2017, the U.S. Tax Cuts and Jobs Act ("TCJA"), the U.S. changed from a "worldwide" tax system to a hybrid–"territorial" tax system, to encourage U.S. multinationals to relocate functions back from tax havens.In addition, the US, as the UK had done in 2009–12, aimed to become a favoured destination for foreign multinational to relocate.In their October 2017 report on the proposed TCJA legalisation, the U.S. Council of Economic Advisors, quoted Hines' work on tax havens, and used Hines' calculations, to estimate the quantum of U.S. investment that should return as a result of the TCJA.