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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Fears over Notting Hill Carnival reveal more about racism than reality

Statistically, the event is about as safe as Glastonbury.

Notting Hill carnival is terrifying. As soon as the sun sets, gangs emerge ready to prey on unsuspecting attendees with Red Stripe cans fashioned into knives. Children barter for drugs. Dancing is punctuated by ceremonial burials for those killed in between every dancehall tune. And that's just on the kids’ day.

Except, it's not true. Statistically, the event is about as safe as Glastonbury - if not safer, judging by the number of arrests. In 2015, Glasto was praised for its low arrest rate (75 arrests for a crowd of 135,000), but in the same year carnival had ten times the capacity and fewer than ten times the offences.

Despite these statistics, the police, MPs and newspapers seem desperate to paint carnival as a gang-run danger zone. The Met Police recently tweeted about a kilo of heroin seized in the run up to carnival, despite not even knowing whether the perpetrators were going to the event. MPs, such as former Kensington MP Victoria Borwick, are happy to fuel this fire, claiming to be concerned about the supposed “year on year increase in violence and physical harm to our police officers and members of the public”. Newspapers revel in publishing large spreads about the raids in the run up to the two days, despite lacking evidence they’re even connected. Break this down and it’s clear: this dislike towards carnival roots itself in racism - the presumption that a festival celebrating black, West Indian culture, frequented by a higher proportion of black British punters, must inevitably, be violent.

I have been attending carnival since the age of six, when my parents moved to the area (90s gentrification alert). I used to sell Ribena for a markup on my street, took part in the float my primary school ran and every year witnessed the incredible recontextualisation of the area. Gone is the whitewashing for a moment: the streets and houses become splattered in neon paint, jerk chicken boxes and Red Stripe cans. It is one of the best things to happen to the area, and its vast cultural value exceeds the bougie cafes and boutique clothing stalls that span the area.

And yet, every year, I have to dodge questions from relatives and friends about how dangerous it supposedly is. “Ooh, Notting Hill carnival. Bit scary, isn't it? Lots of angry youth who can get quite violent I hear. Didn't someone get stabbed last year?” Perhaps a viable question to ask anyone going to a crowded event. Except, why weren’t they asking me this when I flew to Amsterdam this year to go to a music festival?

There's another side of critiquing carnival that is equally infuriating, and that's that the fact that the event in some ways stands as a consolation prize to the original tenants of the area. In the middle of the 20th Century, Notting Hill was far from the Russian oligarch haven it is today. It was the Windrush Era, when black immigrants began arriving from the Caribbean. They came not out of some overwhelming desire to be freezing for 11 months, but because Britain was struggling after the Second World War, and desperately needed a labour force. Despite the demand, the West Indians were met with hostility and racism, forced to live in the worst areas of London. One of those places was Notting Hill.

Imagine, then, the audacity of shaming carnival. Imagine being forced by racism into a rundown neighbourhood, turning it into something fashionable, and then being priced out by middle-class white people. Imagine on top of that, having your legacy celebration degraded under the guise of safety concerns.

This year will feel different. It will be the first year ever under a Labour MP. It will also come two months and a half months after the Grenfell fire, where many of its residents and victims will have taken part in the event. Whilst there’s something defiant in these parades, it will be hard for the collective joy not to be marred by a knowledge that somewhere in this borough, bodies are being buried because of our council.

We need to see carnival for what it is: a celebration of a culture struggling to stay afloat in the area. Kensington continues to edge out those who may not be living in £2.5m homes - whether it’s with rising house prices, creating anxiety around an event or even putting lives at risk due to sheer disregard and greed. If you’re worried about going, I would avoid all large, crowded events in general, because there’s no use believing the vacuous and racist hype. Beyond getting splattered with paint and dancing too enthusiastically to Bashment, there’s nothing to fear.