I think it’s not income earners or at least not salaried ones that many people mean when they say this. As someone posted upthread more taxes linked to wealth and less to income might be beneficial. If I personally were choosing to restructure I think I would also want to understand where we stood to make the biggest tax gains. Just targeting the very wealthy doesn’t necessarily raise that much compared to everyone paying a little bit more. As an example reducing the personal allowance to £10k would raise billions across the whole workforce and would cost someone on lowest rate of tax about £40 a month. To raise the same amount by targeting the top 5% you’d be costing those people about £800 a month. Even on a high salary that’s a big difference. Yes for some people £40 is also a significant difference but for many of them it would be quickly offset if that money was invested in things like social housing for more affordable homes, NHS dentistry, better public transport etc. If everyone paid more tax rather than just the top 5% you’d have enough to provide better services and those better services would likely most benefit those in lower incomes proportionate to the cost.
I would like to see NI & tax combined and everyone paying same rate on earned and unearned income, marginal rates abolished (personal allowance for all or none at all and replaces with a lower rate on first slice of income), IHT thresholds abolished with only estates not liable to tax being those left to a partner whose main residence was with you (Tax should be payable at point the estates assets are sold capped to a timescale of a number of years to give anyone else living in parents/relatives house time to identify alternative arrangements with the part of the estate they will inherit), capital gains thresholds to be eliminated.
Tax free schemes exist to incentivise people to save/invest even outside pensions (share schemes in work place, ISAs, separate allowance for interest on savings). Is this a desirable behaviour or would spending benefit the overall economy more? If the latter then eliminate the schemes.
I think top earner in a company only being able to earn a maximum of a multiplier of bottom earner is nice in theory but in practice might lead to minimum wage/low wage type jobs being subcontracted so they were officially in a different company or high earners moving to being part owners of the business with a lower salary and rest made via their stake in the company.
We don’t pay higher rate tax currently as, being borderline, it’s better for us personally to invest more in pensions and keep our child allowance. Unless and until we need what we earn above the threshold we will just keep putting more in pensions for next 10 years. It’ll help us retire earlier if we want and leaves us better off overall. If we would keep the child benefit regardless we likely would spend at least some of that money. I can well imagine those on around £100k have a similar approach to avoid the marginal rate.