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.

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Theresa May’s stage-managed election campaign keeps the public at bay

Jeremy Corbyn’s approach may be chaotic, but at least it’s more authentic.

The worst part about running an election campaign for a politician? Having to meet the general public. Those ordinary folk can be a tricky lot, with their lack of regard for being on-message, and their pesky real-life concerns.

But it looks like Theresa May has decided to avoid this inconvenience altogether during this snap general election campaign, as it turns out her visit to Leeds last night was so stage-managed that she barely had to face the public.

Accusations have been whizzing around online that at a campaign event at the Shine building in Leeds, the Prime Minister spoke to a room full of guests invited by the party, rather than local people or people who work in the building’s office space.

The Telegraph’s Chris Hope tweeted a picture of the room in which May was addressing her audience yesterday evening a little before 7pm. He pointed out that, being in Leeds, she was in “Labour territory”:

But a few locals who spied this picture online claimed that the audience did not look like who you’d expect to see congregated at Shine – a grade II-listed Victorian school that has been renovated into a community project housing office space and meeting rooms.

“Ask why she didn’t meet any of the people at the business who work in that beautiful building. Everyone there was an invite-only Tory,” tweeted Rik Kendell, a Leeds-based developer and designer who says he works in the Shine building. “She didn’t arrive until we’d all left for the day. Everyone in the building past 6pm was invite-only . . . They seemed to seek out the most clinical corner for their PR photos. Such a beautiful building to work in.”

Other tweeters also found the snapshot jarring:

Shine’s founders have pointed out that they didn’t host or invite Theresa May – rather the party hired out the space for a private event: “All visitors pay for meeting space in Shine and we do not seek out, bid for, or otherwise host any political parties,” wrote managing director Dawn O'Keefe. The guestlist was not down to Shine, but to the Tory party.

The audience consisted of journalists and around 150 Tory activists, according to the Guardian. This was instead of employees from the 16 offices housed in the building. I have asked the Conservative Party for clarification of who was in the audience and whether it was invite-only and am awaiting its response.

Jeremy Corbyn accused May of “hiding from the public”, and local Labour MP Richard Burgon commented that, “like a medieval monarch, she simply briefly relocated her travelling court of admirers to town and then moved on without so much as a nod to the people she considers to be her lowly subjects”.

But it doesn’t look like the Tories’ painstaking stage-management is a fool-proof plan. Having uniform audiences of the party faithful on the campaign trail seems to be confusing the Prime Minister somewhat. During a visit to a (rather sparsely populated) factory in Clay Cross, Derbyshire, yesterday, she appeared to forget where exactly on the campaign trail she was:

The management of Corbyn’s campaign has also resulted in gaffes – but for opposite reasons. A slightly more chaotic approach has led to him facing the wrong way, with his back to the cameras.

Corbyn’s blunder is born out of his instinct to address the crowd rather than the cameras – May’s problem is the other way round. Both, however, seem far more comfortable talking to the party faithful, even if they are venturing out of safe seat territory.

Anoosh Chakelian is senior writer at the New Statesman.

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