By Christian May One of the many problems the government has got itself into over tax rises that may or may not appear in the upcoming Budget is an oversimplification of where the cost of a certain tax falls. Ministers and their supporters talk about Capital Gains Tax as if it only lands on rich people selling off a painting or two, when in reality it’s often another way of taxing businesses and income. When it comes to non-doms (and here they’re following an unhelpful playbook started by their predecessors in office) they talk about finding ways to tax this cohort as if they don’t already con…