[EDIT]
Sorry, I meant to reply to the person you replied to. Please ignore me.
[/EDIT]
That is £4k a month take home.
The median income for a full-time worker (so that excludes everyone who works part-time, like the OP) as of April 2025 was £39,863 [Source ONS Employee earnings in the UK: 2025].
Assuming that they have a typical auto-enrollment pension then that person on median pay would be taking home £2,595 per month - and only £2,517 per month if they were a graduate on Plan 2.
A graduate on Plan 2 and who is also paying in to a typical workplace pension and who is taking home £4k per month will be earning £73,100 per year - almost double the median salary for a full time worker - ok, that's an exaggeration, it is 83% more.
.
"...wow 4k is a high earner"
This is the ONS definition of a low and high earner:
"Low pay is defined as the value that is two-thirds of median earnings and high pay is defined as the value that is 1.5 times median earnings."
So, a low paid full-time worker is a full-time worker earning less than £26,575 per year (basically, anyone on minimum wage) and a high earner is a full-time worker earning more than £59,795 per year (take home pay of £3,454 for a graduate or £3,682 for a non-graduate).
According to the ONS, around 23% of full-time workers in the UK are "high earners".
But I take your point that calling 23% of full-time workers "high earners" is maybe stretching the point a bit. But they are definitely earning more than the 77% of full-time employees who aren't. You may have heard the phrase "upper quartile"? In this situation, it is people earning over £59,795 per year
But how about if we just look at the top 10% of earners? If you're in the top 10% then you're definitely a high earner. Would you agree with that?
To make the top 10% of full-time earners you need to be earning £76,903 per year. That is a take home of £4,509 per month for a non-graduate or £4,153 for a graduate.
So, yes, if you're taking home £4k per month then you are almost in the top 10% of full-time earners. I think that definitely counts as a "high earner"