It's not so much begrudging money, it's that I find it mind-blowing that a single mother on £70k - an amount of money that most people would say puts you right outside the realms of any sympathy for not having enough money, as we've seen on this thread - ends up with the same amount of money as someone on minimum wage. Someone who may have 3 extra kids to look after, but also has significantly less childcare (all school age rather than nursery age).
I find that utterly insane.
If we really think that's the minimum amount the TA needs to live a basic OK life, then how is it that someone earning top 5% of income also only gets to keep the minimum amount of income to live a basic OK life.
That there's practically no difference in how much disposable income a single mother has regardless of whether she earns minimum wage or top 5%
That's just nowhere near fair, in terms of how we organise our society.
I've heard people say on another thread recently that it's a problem that such a tiny proportion of our society are net financial contributors, but this shows how it plays out.
I do think long-term we need to move to be closer to the nordic model, where everyone pays more tax but it's distributed more evenly across the income spectrum - so lower earners are actually paying in too. And subsidise childcare properly (not the unfunded free hours, which made nurseries close and costs actually rise for most parents).
In the meantime, OP: I think I'm changing my advice. Do the numbers for yourself, and if it makes sense for you then see whether you can drop right back to 1 or 2 days for a few years - I know that in some high-paying jobs that's impossible, but if you're good at your job and explain the situation they might be willing.
If you go down to 1 or 2 days a week, I think you'd only be about £45 per month worse off, maybe better off depending on your commuting costs.
And you'd get to enjoy time with your DC and be much less stressed! Entry to parks and things is also cheaper during the week. There's no educational need for nursery, which someone threw in (it's not bad, but it's certainly not better than time with an educated, engaged mother - and your DC will love being with you).
In a couple of years, once your DC is at school, up your hours again. Keeping your hand in with 1-2 days at work means you will be able to do that - that's the really critical part. And the earnings mean you're entitled to the UC and childcare support without having to apply for more jobs.
It's crazy, and it's terrible for the country that it works out this way (instead of paying 17k into the coffers, you'll be taking out about £20k). But that's what our tax system is.