In 2009, Caine publicly criticised the Labour government of Gordon Brown for its new 50% income tax rate on top earners and threatened to return to the US if his taxes were increased further. During the run up to the 2010 general election, Caine publicly endorsed the Conservative Party and appeared with then-party leader David Cameron for the launch of a civilian non-compulsory "National Service" for sixteen-year-olds, although Caine stated he had previously supported New Labour under the leadership of Tony Blair in 1997. In July 2014, Caine was reported to have been a celebrity investor in a tax avoidance scheme called Liberty. In November 2014, Caine described the proposed mansion tax by then Labour leader Ed Miliband as "preposterous and silly."