To find salary offered an insult?

I'm with you, OP. Going from managing no one to managing 3 people is a big change - an 8k after-tax pay rise (max) in exchange isn't the most generous thing in the world. As with others, I'd either say "No" or say "I'd be happy to do that, but I'd want to be looking at a salary of X in exchange". You can use https://www.thesalarycalculator.co.uk/salary.php to do rough take-home change estimates personal to you.

Sounds amazing to me but then I took on 5 direct reports for a measly £5k payrise - the amount of extra work is ridiculous, I'd much rather be on £5k less and have less stress!

I work for the local authority and managing 3 people would take me up a grade and I'd earn £42k instead of £40k. Is MN the SM site of the elite? So many posts acting like earning over a 100k is the norm and being offended by salary offers that would be a dream for the majority of people.

That’s a reasonable offer. In the public sector you would just be expected to do it

If it was me and line management was something I was happy with I'd shift 20% into pension contributions and then plan to retire 5+ years early or however much depending on how much longer you have to work.
20% uplift is huge. I'm my last company (big 4) my senior manager retired and my manager was given his role whilst retaining his old one, went from managing 5 to managing upwards of 20, had to work 80 hour weeks often 7 days a week and was given sweet fuck all. Most places have given well under 10% for adding line management responsibilities.
If you don't want the responsibility that's fine, but this is a very generous increase to salary.

I think the pay offer is reasonable but the idiotic tax system means it’s not worth taking on the extra responsibility and hassle given the impact on your take home pay.

Just decline the offer if it’s not worth it to you. It seems reasonable though and I’m not sure why you’re so insulted by it that you’re saying tell them to stuff it.

I line manage 4 people and get paid no more than others on my pay grade that have no line management responsibilities. It’s not the way it works with our pay grades, but it does mean should I want to go for promotion I might have a better case than them (but not necessarily).

Wow. I manage up to 24 people daily (changes based on the day, part time cobtracts etc) on a 0.8 contract and earn 36k per year. Public sector sucks 😂

Yeah this is what I don't get.

If she's so big and important that she can just 'walk' into another job if she's restructured out of this one, why has she turned to a parenting website for advice?

Embarrassing.

YABU.... But only because I only know of restructures in the HEI sector whereby people have been told they're now managing X number of people (having zero reports before) with absolutely no increase in salary and staying on the same grade as others who have no LM responsibility...

Oh, and on about a third of the salary you've been offered!

OP, you are perfectly reasonable to say no thanks to a low ball offer after tax.
What exactly is the net gain, versus the responsibility.
You already have huge sole responsibility in your private life, such an increase in work needs to be worth your while.
Yanbu at all.

What a bloody ridiculous mindset.

You’ve clearly never worked in the health service!

I dont think its insulting but you will get clobbered for tax, and probably won't see much of an increase.

I'd turn it down because I hate managing people.

OP, I wouldn't find it insulting but bear in mind it's their first offer. Why don't you counter it? They can only say no.

I don’t think it’s unreasonable personally but it’s entirely your choice!

I don’t agree with it but in the NHS the difference between a band 6 charge nurse and band 7 Ward Manager was less than £1k a year when I stepped up. The difference in responsibility was enormous. I was managing nearly 30 people.

I did get an incremental rise after 2 years but stepped back a band in a different role with no managerial responsibilities and I now earn more because I do unsocial hours for a huge amount less stress.

You need to look at the salaries of your colleagues who are on that level of responsibility. There will be bands and you can't expect more than others with more responsibility.

I have 6 direct reports on £160,000 if relevant.

You don't say your household income, but if it's around 90k ish split Iver 2 salaries then you're probably taking home more or the same as OP on a single salary of 105k. Plus you can claim child benefit which she won't be able to.

I’ll tell my mate she’s in the wrong line of business. 😀

In which case, I’d only do it if there was a clear hell out of dodge progression route. 🙂

Nor I. Not because of the responsibility but the timing. You're on your own with young children. You don't need more on your plate just now.

no one can manage 150 people effectively. I suspect he had direct reports.

It's £2.80 ph extra after tax.

This I had a year or so in this bracket now through it so much better.