Donald Trump’s plan to encourage US companies to repatriate profits held offshore will allow the 50 biggest American corporations to save at least $300bn (£240bn), according to research by Oxfam.  The US president has promised that he will get America’s biggest companies to bring their vast offshore cash piles back to US soil by offering a one-off tax holiday.  The plan is to tax repatriated money at 10% rather than at the statutory rate of 35%.  America’s 50 biggest companies had combined offshore cash piles of more than $1.6tn in 2015, according to Oxfam’s research...Trump’s proposed tax holiday would be a big boost for US technology companies which make a lot of money overseas and often park the profits in low-tax jurisdictions, such as Ireland...Oxfam’s research suggested that Apple would save $43.5bn in tax by taking advantage of Trump’s one-off 10% repatriation tax...Ana Arendar, Oxfam’s head of inequality, said: “These companies have deepened their use of tax havens and increased efforts to build influence to push for even greater tax breaks than they already have. Corporate tax dodgers cheat the US out of approximately $135bn in unpaid tax revenues every year and poor countries out of an estimated $100bn annually.”...