We should abolish NI and just roll it into general income tax.
It was, in the old days, effectively what it said on the packet. You paid in NI and this was insurance for using the NHS and a basic pension (and maybe some other stuff which I forget). That is why you don’t pay it on retirement, as you have already fully bought your pension.
It used to be, at least theoretically, ring fenced. Then, a while ago, they removed the ring fence and it just became a weird extra non-progressive tax for the government to play around with in our overly complex tax system.
And the government should also look at CGT on people’s primary residence. It is a tough one, as you want a mobile population, but maybe this could be done and stamp duty drastically reduced. Again, this would discourage people leveraging up and using their home as a tax efficient investment vehicle and maybe invest more in our stock market and, thus, increase productivity.
We don’t need less tax, we need a far simpler, fairer tax system, which encourages hard work and investment and not expensive houses and share buy backs (which help top rate tax payers vs disadvantaging ordinary pensioners).