Wealth tax on anything above £25k was proposed above by @Fujimora. I think that's setting the bar a bit low.
Ah, I get it now, sorry. The way the thread was going is read like people were discussing this as Labour policy. I see now it was just a suggestion.
It really demonstrates how much a lot of people misunderstand wealth, income and tax though. Fujimora proposed a wealth tax, and then defined who would have to pay it not by their wealth, but by their income. That doesn't make any sense. A billionaire with an ingerited fortune could quite possibly have an income of 25K pa, so could a struggling manual worker trying to feed a family of four. Both of these individuals could also have an income of £20K pa, or nothing.
Income doesn't mean anything about how much wealth people have, and the first thing anyone who becomes rich does is get an accountant to make their income look as low as possible, to minimise income tax. The whole point of a wealth tax is to address that, by taxing wealth, not income.
There are various ways that can be done: directly via more stratified council tax bands (or, better in my view, a land value tax) and inheritance tax. And indirectly via capital gains tax which, while technically an income tax, is taxing the income people get from investing their wealth, rather than directly from their labour. The fact that people pay lower rates of tax on the money they get for doing fuck all once they've gotten past the point of having to rely on their labour, than they do on the proceeds of that labour itself while they still need it to have a house and food next month, tells you all you need to know about what's wrong with this country.
However, the tax burden falls most heavily on the decently-but-not-excessively-rewarded. Low-earners don't pay much tax and UC top ups make them beneficiaries
The point about benefits is valid (though most benefit recipients are in work so subject to national insurance and income tax) but in percentage terms, the relative tax burden of poorest and richest is very different from what most people think. That's because low earners DO pay tax - they pay VAT on most stuff they buy (and everything they earn goes on buying stuff, unlike the rich where most of it goes into pensions, investments etc.), import duties passed on in the price of goods, etc. And national insurance, which is a tax in all but name and cuts out at middle income levels.
A while ago I came across a document that analysed all this and found that the lowest 20% of the income distribution actually pay far more tax ^as a proportion of their income* than most people think (simply because their income is so low), and more (again, in percentage terms) than the top 20%. Not sure if I've stll got it.