Private business owners risk a multimillion-dollar tax hit if they rely on a Treasury shortcut that assumes their assets grew at the same rate every day, advisers warn. The final tax difference would depend on inflation, the owner’s circumstances, the asset’s cost base and access to small-business CGT concessions. Asked whether a valuable private business should rely solely on the shortcut, he said: “Definitely not. The taxpayer has the choice, but you need the June 30, 2027 valuation to make the correct choice.” “Those business owners who take the advice now will be better off in the long run.”