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There are strong arguments for retaining insurance based social security contributions and equally strong arguments for merging them with income tax as you suggest (though the overall rate would have to be 32% rather than your 30%). What there is no justification for is our current ss system, a clumsy, inequitable stealth tax brought in to offset the losses incurred when the ‘zero-10’ regime was introduced. Better still than your idea would be to merge income tax and social security contributions into a single income tax on earned and unearned income but keep contributions to the States pension separate. The States pension was never a good fit with other social security benefits and few mind paying the contributions.