Child benefit withdrawal will make it better to work less for families with over seven children

And come 2076, that will be the case for every family in the nation.

The child tax credit withdrawal, taking effect on Monday, will lead to marginal tax rates of over 100 per cent on families with more than eight children earning between £50,000 and £60,000.

The IFS explains how the marginal rates are calculated:

Affected taxpayers will pay back one per cent of their family’s Child Benefit for every £100 by which taxable income exceeds £50,000. One per cent of Child Benefit is £10.56 per year for a 1-child family, and an additional £6.97 per child for larger families. Hence the marginal tax rate between £50,000 and £60,000 is increased by about 11 percentage points for the first child and by an additional 7 percentage points for each subsequent one. So, for example, while about 320,000 people will find that their marginal income tax rate increases to more than 50%, about 40,000 of them - those with three or more children - will find that it jumps to at least 65%.

They offer a chart with the rate calculated up to four children:

By seven children, the marginal rate rises to 99.35 per cent, and by eight, it breaks 100 per cent (106.32 per cent, to be exact). This means that any individual with a family of eight kids earning between £50,000 and £60,000 would be better off if they reduced their salary back down to £50,000. In fact, for that individual, they would have to earn £61,105 before their post-tax income was the same as it was at £50,000.

It's unclear whether any families actually exist matching that criterion - rather wonderfully, my back-of-the-envelope maths (which assumes that the exponential decrease in the number of families of each size continues: e.g., there are 1/8th the number of families with three or more kids as there are with two or more, so I'm assuming that there are correspondingly 1/8th the number of families with four or more as there are with three or more, and so on) suggests that there may be exactly one – but even if there are none at the moment, there's no reason why there won't be one in the future. Families with eight children do, after all, exist.

In fact, as time goes on, this problem will get worse. The IFS points out that child benefit is uprated with inflation, while tax bands aren't. Currently, each extra child after the first increases your "marginal tax rate" by around seven per cent, but suppose child benefit is uprated by two per cent a year. In that case, the marginal tax would exceed one hundred per cent for families with seven children next year; for six children in the year 2020; for five children in the year 2028; and, eventually, for families with just one child – i.e., every family – in the year 2076.

Hopefully the law will be changed before then, of course. But as a rule of thumb, laws which become ridiculously damaging unless you actively intervene ought not be signed in the first place. Oops.

Children. Photograph: Getty Images

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

Photo:Getty
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Labour is a pioneer in fighting sexism. That doesn't mean there's no sexism in Labour

While we campaign against misogyny, we must not fall into the trap of thinking Labour is above it; doing so lets women members down and puts the party in danger of not taking them seriously when they report incidents. 

I’m in the Labour party to fight for equality. I cheered when Labour announced that one of its three Budget tests was ensuring the burden of cuts didn’t fall on women. I celebrated the party’s record of winning rights for women on International Women’s Day. And I marched with Labour women to end male violence against women and girls.

I’m proud of the work we’re doing for women across the country. But, as the Labour party fights for me to feel safer in society, I still feel unsafe in the Labour party.

These problems are not unique to the Labour party; misogyny is everywhere in politics. You just have to look on Twitter to see women MPs – and any woman who speaks out – receiving rape and death threats. Women at political events are subject to threatening behaviour and sexual harassment. Sexism and violence against women at its heart is about power and control. And, as we all know, nowhere is power more highly-prized and sought-after than in politics.

While we campaign against misogyny, we must not fall into the trap of thinking Labour is above it; doing so lets women members down and puts the party in danger of not taking them seriously when they report incidents. 

The House of Commons’ women and equalities committee recently stated that political parties should have robust procedures in place to prevent intimidation, bullying or sexual harassment. The committee looked at this thanks to the work of Gavin Shuker, who has helped in taking up this issue since we first started highlighting it. Labour should follow this advice, put its values into action and change its structures and culture if we are to make our party safe for women.

We need thorough and enforced codes of conduct: online, offline and at all levels of the party, from branches to the parliamentary Labour party. These should be made clear to everyone upon joining, include reminders at the start of meetings and be up in every campaign office in the country.

Too many members – particularly new and young members – say they don’t know how to report incidents or what will happen if they do. This information should be given to all members, made easily available on the website and circulated to all local parties.

Too many people – including MPs and local party leaders – still say they wouldn’t know what to do if a local member told them they had been sexually harassed. All staff members and people in positions of responsibility should be given training, so they can support members and feel comfortable responding to issues.

Having a third party organisation or individual to deal with complaints of this nature would be a huge help too. Their contact details should be easy to find on the website. This organisation should, crucially, be independent of influence from elsewhere in the party. This would allow them to perform their role without political pressures or bias. We need a system that gives members confidence that they will be treated fairly, not one where members are worried about reporting incidents because the man in question holds power, has certain political allies or is a friend or colleague of the person you are supposed to complain to.

Giving this third party the resources and access they need to identify issues within our party and recommend further changes to the NEC would help to begin a continuous process of improving both our structures and culture.

Labour should champion a more open culture, where people feel able to report incidents and don't have to worry about ruining their career or facing political repercussions if they do so. Problems should not be brushed under the carpet. It takes bravery to admit your faults. But, until these problems are faced head-on, they will not go away.

Being the party of equality does not mean Labour is immune to misogyny and sexual harassment, but it does mean it should lead the way on tackling it.

Now is the time for Labour to practice what it preaches and prove it is serious about women’s equality.

Bex Bailey was on Labour’s national executive committee from 2014 to 2016.