Yes it is off topic but you did start a discussion about how we tax people on a post about whether a husband should go part time.
No. I and others mentioned the tax because it is relevant: many posters (and potentially the OP based on her initial posts about how much she'd need to work to make up the income from her husband reducing his hours) were clearly not factoring in the tax/ childcare funding impact which is likely to mean that there is very little impact on net income at all from him reducing his hours by 20% or 30%, particularly when they still need childcare. This was relevant, useful information for the OP and factual. Others then started to take exception to anybody mentioning these tax impacts with the usual, predictable and bitter personal comments of "priviliege" etc that happens every time anybody discusses tax impacts on higher earners on Mumsnet, so I continued to explain the impacts in more detail with figures to illustrate the point in real terms and why it is relevant to the OP's situation.
There is plenty of information on this in easy to understand articles if you're not minded to look at the underlying economic research papers and how it impacts productivity, for example:
https://www.cityam.com/childcare-rules-why-hitting-six-figures-leaves-high-flyers-in-a-parent-trap/
These charts that don't even include the childcare funding/ student loan impact that can take the marginal tax rate to over 100% per the article above:
https://ifs.org.uk/taxlab/taxlab-data-item/combined-marginal-rates-income-tax-and-national-insurance-contributions
These charts which show how those in employment are taxed far more heavily than the self-employed or those with assets:
https://ifs.org.uk/taxlab/taxlab-data-item/tax-penalty-employment
This analysis showing how the UK tax system is extremely progressive compared to others internationally and what a huge contribution these higher earners make to our tax revenues and why if we want taxes to fund public services it is a bad idea to make it uneconomical for them to work full time:
https://ifs.org.uk/taxlab/taxlab-taxes-explained/income-tax-explained
Even the Guardian has acknowledged the issue following the publication of the economic research showing how much this is damaging productivity:
https://amp.theguardian.com/business/2023/feb/13/full-time-part-time-work-no-longer-pays-uk-economy
This is an economic reality. But if you'd like to discuss it further, as I said, a separate thread might be more appropriate.
The tax bracket for that very specific income level is about 9th highest from what I can remember compared to comparable countries.
It's not, when you do a proper analysis comparing like with like including the withdrawal of tax allowances and nursery funding. That was the point.
For example, this excerpt from the following article may help to explain it further for you:
"Further down the income distribution, among some of those earning close to the £100,000 mark, there is an even more dramatic problem. Entitlement to free childcare, an entitlement which was extended to the under threes last month, is ended once income hits £100,000. Childcare is expensive enough that it is perfectly possible for a parent with a couple of children to be better off earning £99,000 than earning £130,000.
Further down the income scale again, well over half a million parents with incomes between £50,000 and £60,000 face marginal tax rates of 55pc or more because child benefit is now taxed away as income rises between these two points. Someone with two children faces a rate of around 60pc and if you have three children the withdrawal rate rises towards 70pc. Astonishingly, while we consider parents earning just over £50,000 to be rich enough to pay 40pc tax, and to have their child benefit withdrawn, we also consider some 50,000 of them to be poor enough to be entitled to universal credit. They will lose around 80p or more of every extra pound earned."
And this doesn't even include the additional 9% effective tax for student loans which can mean net income is higher earning £99,999 than it is at £150,000.
https://ifs.org.uk/articles/britains-economically-damaging-tax-system-now-indefensible
A competent Government has a rational tax system that is fair and does not discourage work with such anomalies that obviously harm productivity. This is an insane way to structure things in the same way the Universal Credit taper rate is insane. We should be able to discuss such points without it descending into inane "but I hate people who earn more than me!" nonsense.
As for your second point I'm sorry but you haven't done anything to make yourself sound less detached and privileged - a couple earning a joint average income of £55k are entitled to very little government help, still need to pay for childcare and also in the vast majority of cases still need to live in an expensive area to access their employment?! Those people are statistically the majority and you seem to be totally oblivious of that.
I have been discussing the structure of the tax system not my personal circumstances.
A couple with children who both earn the national average salary (which is £38k btw so £76k for a couple: www.forbes.com/uk/advisor/business/average-uk-salary-by-age/#:~:text=The%20latest%20government%20data%2C%20published,of%206.2%25%20compared%20to%202022) have a far higher net income than a single earner/ lone parent earning say £110k, after childcare is factored in, plus child benefit, personal allowance withdrawal, nursery funding, tax free childcare etc is withdrawn.
These are just facts, mathematical calculations. It's disappointing that certain people want to to deny reality for political reasons of whatever and lower themselves to making personal comments.
As for your personal comments to me about being "detached and privileged" - not that it is remotely relevant - but I grew up in poverty and abuse, and am now a lone parent, chrinically ill and have two children with disabilities, hardly my definition of "privilege". Perhaps you should refrain from making personal comments about posters whom you know nothing about whatsoever.
If you do wish to discuss this further, as I said, I do not think this OP's post is the appropriate thread upon which to do so.