Business groups have warned that Andy Burnham would deal a huge blow to Britain’s economy if he follows calls to ramp up wealth taxes. The presumptive prime minister is under pressure to increase capital gains tax, with top ally Louise Haigh calling for the rate to be brought closer to income tax, potentially raising it from 24 percent to as much as 45 percent. Allies have also called for an exit tax, levying capital gains tax at the border when entrepreneurs and investors leave the country. Philip Salter, founder of The Entrepreneurs Network, said raising capital gains tax again or failing to rule out an exit tax would be a huge blow to Britain’s entrepreneurial ecosystem, deterring talent and pushing out those already building businesses. Anna Leach, chief economist at the Institute of Directors, warned that speculating on tax changes risks damaging growth for the third summer in a row, while Leslie Macleod-Miller of Foreign Investors for Britain cautioned against waging a war on wealth, saying the government’s plans rely heavily on private capital.