Yes, although that could be classed as a benefit withdrawal rather than a tax (the child benefit clawback), though I'd agree with calling student loans effectiv

Yes, although that could be classed as a benefit withdrawal rather than a tax (the child benefit clawback), though I'd agree with calling student loans effectively a graduate tax under the current system (since very few would expect to ever fully repay them). More broadly benefit withdrawal rates are another horror show which create all sorts of bad incentives in the UK - the withdrawal rate for universal credit is 55% on post-tax income above the "work allowance". That can mean marginal combined tax and benefit withdrawal rates into the high 60s% for some of the lowest-paid workers!