Also at £100k you start to lose your tax-free personal allowance. The commitment of successive governments to avoid raising taxes on "ordinary working people" has created a bizarrely inconsistent tax regime for above-average earners, where people earning £65k could end up paying a much higher marginal rate than people earning £165k.
https://taxpolicy.org.uk/2024/10/17/reform-income-tax-end-th...