When Rachel Reeves’s ambition was to find £22 billion, it was already clear that she would need to find more revenue than what was expected to come from the relatively small take hikes the party announced it would pull pre-election. When that number was upgraded to £40 billion, there was no denying that a big tax hike was coming, the kind that tends to come from the major revenue raisers: income tax, National Insurance, or VAT.