[neoeldex]

The problem with taxing income is that it taxes the lower/middle class heavier than upperclass. Usually the upperclass has ways of diverting their income into other means. Taxing profits is the current approach. There's been talk about taxing revenue for companies. Which is measurable on a nation's level

[sjwright]

Then identify the ways wealthy people can divert income (e.g. Australia's fringe benefits tax) and force them to report it as income.