You might be underestimating how frustrating some of the perverse consequences of the way the tax and benefits systems are structured are for people just over various thresholds. People do feel quite angry about it.
For example, when earning c.£38k you can UC to help with childcare costs and child benefit. This means that you can have a net monthly income of nearly £3700 in total (using £1200 a month nursery fees for the entitledto calculation).
Changing to a new job earning £65k will mean you lose UC and child benefit and net £3950 (without student loan payments). You’d get tax free childcare, which is worth about £160 a month. But still… it hardly seems worth it. Especially if you consider how much more stressful the £65k job might be.
The bigger picture is, of course, that the hideous childcare payment years end. And the bulk of the UC award is childcare payment. In the longer term, it is much better to take the better paid job. And you are still better off, even if by less than you’d think.
But the system does not feel well designed when substantially increasing your gross salary isn’t reflected in what reaches your bank account each month.
It’s much worse at £100k and people do end up actually worse off for having crossed that threshold. And that is ridiculous.
Just to be entirely clear for the people determined to believe higher earners are just nasty complainers, I am not presenting this as a woe-is-me poverty tale for higher earners. I’m not trying to say that £4k a month is living on the breadline or something. Just that the outcomes from a poorly designed system can feel unfair.
It is easy to see why some people might feel quite angry about this stuff.