Richard Murphy, who, among other things, was a cofounder of the Tax Justice Network many years ago, addressed the question of how to pay for defence in a recent blog.
He first of all referred to a tract written by J.M. Keynes at the start of WW2 called How to Pay for the War. Keynes made two points.
I quote from Murphy's blog: Keynes said that we must tax the rich more because they've got the money, and they must, therefore, make the sacrifice because we can't ask what he would have described as ordinary people to make that sacrifice because we're also asking them to serve in the front line to deliver the victory that we need. It was not possible to ask those people to give more than they already were, because they had nothing more to give, whereas the wealthy clearly had got more to give.
They could give more money, and they could give something else, which was their consumption. They could give up things and still live a good life, whereas those who were on low levels of income could not.
Murphy contends that what was true in 1940 is still true in 2025
It is still true that the wealthy do have the money, and the wealthy have the good life, and that there are vast numbers of people in the UK who have very little more they can give because they simply don't have enough already. So, we can use the lesson that Keynes gave us. We should be taxing the rich more because they are the people who should be paying for the peace if that is what we are trying to preserve.
Having said that he suggests tax measures which could bring in substantial sums:
restrict tax relief on pension contributions in the UK to the basic rate of income tax, so that everybody gets the same rate of tax relief however much they earn. In other words, you do not get more subsidy for your wealth if you are wealthier than you do if you are a basic rate taxpayer, which is what happens at present. We have a perverse system which actually subsidises the savings of the wealthy more than it subsidizes the savings of those who are on low incomes.
If we were simply to equalise the rate of tax relief, which I think would be a definition of fairness, that we could raise £14.5 billion
^ We could, for example, align the capital gains tax rate with the income tax rate in the UK - a perfectly sensible thing to do because both capital gains and income end up delivering pounds into people's pockets. The tax system should be indifferent as to where that pound came from. It is fair that the tax system is indifferent in that way because both income and capital gains enrich a person and there's no reason why one should be taxed less than another except for the fact that our tax system is biased to the wealthy and, basically, you've got to be wealthy to have a capital gain.^
This would ^ deliver an additional £12 billion of tax revenue to the government each year.^
we could, for example, reform corporation tax. Corporation tax is in a total mess in the UK. It isn't charged on hordes of companies.
And if we increase the rates of corporation tax in the UK for larger companies to the rates that are commonplace around the world, we could raise another seven billion pounds of corporation tax a year. From corporation tax, we could, then, raise another £19 billion, and I can keep going.
we could recreate something that we had for a long time called an investment income surcharge in the UK. This is, in effect, a national insurance charge on things other than work. Why is it, after all, that work has the highest tax rate in the UK, but if you get your income from savings, investments, rents, trust funds and everything else, well, that gets a lower tax rate? This is perverse, stupid, unreasonable, unfair, irresponsible.
This, and a lot more, is set out in the Taxing Wealth report that he published last year: taxingwealth.uk/
There is a great deal of inequity in our tax system which is biased towards enabling the wealthy to hang on to their wealth.
A week or two ago petra posted a link to a documentary called The Spider's Web. It's available on youtube and is well worth watching:
www.youtube.com/watch?v=np_ylvc8Zj8
I realise that many of us Gnet posters are very comfortably off and have some 'wealth' that we would like to protect, but what we have is chicken feed compared with the wealth which is hidden in tax havens and protected by favourable tax regimes.
www.taxresearch.org.uk/Blog/2025/02/22/how-to-pay-for-defence/
I quoted extensively because Murphy knows far more than I do and has been researching and writing about taxation for a long time. You may disagree with some things but I think his suggestions are sound.