This is a bit misleading, because on £120k salary the employer has to additionally pay £17k of employer's NI which comes from your salary budget. So in real terms you make £137k and your take home is about 53% (and it's get worse as your pay goes up as you are losing personal allowance and your take home quickly becomes less than 50%). It does not account for Apprenticeship Levy. It's a quite nasty way for the government to hide the true level of taxation from employees.