DenDennis isn't National insurance the portion of tax that is 'supposed' to cover 'benefits' under the welfare state?
So you focusing on Income tax ignores £104.6bn 'earmarked' for that purpose.
Does 'Social security benefits' in your post cover state pensions? What proportion of these are pensions?
not sure actually, I'll have to dig the web for more 'facts' but in any case, even if 'benefits' included state pensions, the proportion of payouts compared to combined income tax/nat insurance revenue is surprising…..
What that chart shows perhaps more surprisingly, is the relatively low proportion of corporation tax.