The tax and benefit system is basically broken for couples with children

If you wanted to disincentivise work for the poorest, this is how you'd do it.

Last week, this IFS chart showing the effect of the child benefit withdrawal on marginal tax rates made quite an effect:

IFS Chart

I wrote about it myself, arguing that it underemphasised how bad the effect would be on families with lots of children. But the chart also plays down how bad the existing system is. The interplay between benefits, income tax and national insurance results in marginal tax rates which increase and decrease in a haphazard and unpredictable way, and frequently reach astronomic levels.

The IEA's Philip Booth looked at what he calls "the simplest possible case… of a couple with three children not claiming Housing Benefit, Council Tax Benefit or assistance with child-care costs (or a host of other ad hoc benefits that are available)." The figures were compiled in May last year, but are based on the state of affairs this May – so there may be some lags in exact amounts, but the overall picture remains accurate, at least pre-Universal Credit. Here they are charted in the same format as the IFS'

Chart Two

It's clear that for this case, the tax and benefit system is almost entirely backwards. The largest rates are paid at the bottom end of the income scale, progressively declining to 42 per cent, before finally, at the very top end, increasing to a "high" of 47 per cent.

And as Booth says, this is the simplest possible case. For someone in this situation claiming all the benefits they were entitled to, it's highly likely that at least one of the marginal rates would break 100 per cent – and that the tiny patch of 0 per cent at the very poorest end would disappear entirely.

While Bond and I agree on the problem, it's unlikely we would match minds on the solution. To me, the data above illustrates the fundamental folly of thinking that withdrawing benefits can ever really make economic sense. It is, prima facie, a strong argument for a Green-style citizen's income. Remove the conditionality from benefits and you have a system which encourages work at all income levels, rather than stamping on motivation the minute a family is no longer nominally "poor".

Raphaelle and Fabienne pose with one of their three 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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Recess confidential: Labour's liquid party

Sniffing out the best stories from Westminster, including Showsec, soames, and Smith-side splits.

If you are celebrating in a brewery, don’t ask Labour to provide the drinks. Because of the party’s continuing failure to secure a security contractor for its Liverpool conference, it is still uncertain whether the gathering will take place at all. Since boycotting G4S, the usual supplier, over its links with Israeli prisons, Labour has struggled to find an alternative. Of the five firms approached, only one – Showsec – offered its services. But the company’s non-union-recognition policy is inhibiting an agreement. The GMB, the firm’s antagonist, has threatened to picket the conference if Showsec is awarded the contract. In lieu of a breakthrough, sources suggest two alternatives: the police (at a cost of £59.65 per constable per hour), or the suspension of the G4S boycott. “We’ll soon find out which the Corbynites dislike the least,” an MP jested. Another feared that the Tories’ attack lines will write themselves: “How can Labour be trusted with national security if it can’t organise its own?”

Farewell, then, to Respect. The left-wing party founded in 2004 and joined by George Galloway after his expulsion from Labour has officially deregistered itself.

“We support Corbyn’s Labour Party,” the former MP explained, urging his 522,000 Facebook followers to sign up. “The Labour Party does not belong to one man,” replied Jess Phillips MP, who also pointed out in the same tweet that Respect had “massively failed”. Galloway, who won 1.4 per cent of the vote in this year’s London mayoral election, insists that he is not seeking to return to Labour. But he would surely be welcomed by Jeremy Corbyn’s director of communications, Seumas Milne, whom he once described as his “closest friend”. “We have spoken almost daily for 30 years,” Galloway boasted.

After Young Labour’s national committee voted to endorse Corbyn, its members were aggrieved to learn that they would not be permitted to promote his candidacy unless Owen Smith was given equal treatment. The leader’s supporters curse more “dirty tricks” from the Smith-sympathetic party machine.

Word reaches your mole of a Smith-side split between the ex-shadow cabinet ministers Lisa Nandy and Lucy Powell. The former is said to be encouraging the challenger’s left-wing platform, while the latter believes that he should make a more centrist pitch. If, as expected, Smith is beaten by Corbyn, it’s not only the divisions between the leader and his opponents that will be worth watching.

Nicholas Soames, the Tory grandee, has been slimming down – so much so, that he was congratulated by Tom Watson, Labour’s deputy leader, on his weight loss. “Soon I’ll be able to give you my old suits!” Soames told the similarly rotund Watson. 

Kevin Maguire is away

I'm a mole, innit.

This article first appeared in the 25 August 2016 issue of the New Statesman, Cameron: the legacy of a loser