Somewhere in amongst tge tax argument has to be an understanding that those who earn the most employ accountants to manage finances, finding loopholes and means to pay less, little or no tax. Something not afforded to the less well paid. It is supported by the lax approach by successive governments to chase the higher amounts due and missing but to chase the smaller fish, they have done very little to tackle the existence of the loopholes.
What the tax revenue is versus what it should be shows a huge disparity, small earners juggle to stay afloat and exist in a harsh financial climate, the bigger earners do so, not because they can't pay, but because they choose not to. The threat of an exodus of talent has always been there and is exposed because as a nation we have failed consistently invest in education, preparation and readiness for the workforce. We churn out huge amounts of McEmployees and little in the way of growth and expansive professions.
That or we allow business interests to dictate the goal of education.
Both sides of the political fence are equally guilty, serving corporate interests primarily and the state/society a distance behind.
We are so entrenched in the corporate pocket that wage, therefore tax, disparity penalises the majority whose contribution to the infrastructure is greater than the minority of higher earners who benefit to an equal degree, moreso under the blackmail of business interests