"Fiscal cliff" could knock 6.5% off America's Q1 and Q2 annualised growth

"Taxmaggedon" would hit in January

The American Congressional Budget Office (the inspiration for our own Office of Budget Responsibility) has released a report warning that the impact of the upcoming "fiscal cliff" would be to wipe 4 per cent from GDP growth for 2013.

The fiscal cliff – a phrase coined by federal reserve chairman Ben Bernanke – is the result of a series of several major budget provisions all expiring at once, at the same time as some of the automatic cuts negotiated as part of the debt ceiling crisis last summer come into effect, and several tax cuts time out. More broadly, though, it is the result of America's frankly broken political system.

In March, Congress failed to pass two potential measures which would have ended the crisis:

The first, a bipartisan bill which has the most chance of passing in the Democrat-controlled Senate, was defeated 382-38; the second, the White House's preferred option, was unanimously rejected 414 to 0.

If something is not passed by the time the various provisions expire, on 31 December, then the CBO estimates that:

Those policies will reduce the federal budget deficit by $607 billion, or 4.0 percent of gross domestic product (GDP), between fiscal years 2012 and 2013. The resulting weakening of the economy will lower taxable incomes and raise unemployment, generating a reduction in tax revenues and an increase in spending on such items as unemployment insurance. With that economic feedback incorporated, the deficit will drop by $560 billion between fiscal years 2012 and 2013, CBO projects.

If all the fiscal blows are deflected, the economy should grow by 5.3 per cent (annualised) in the first half of next year. If they aren't, it will instead contract by 1.3 per cent.

The coming showdown has been compared by many to the debt ceiling crisis, when Congress hit deadlock last summer over a budgetary provision which would have caused America to default on its debt, but in many ways, it is more dangerous still. The debt ceiling itself will reenter the political battleground in spring of 2013, and the Republican leader John Boehner is signalling that he will play hardball over the issue. Then there's the fact that the deal will be happening shortly after the presidential election so there is no incentive for dealmaking to start until November; both parties' incentives will differ greatly depending on who will be inheriting the mess.

Related, Joe Weisenthal suggests the most apocalyptic scenario possible:

It's very easy to imagine Romney winning the popular vote and Barack Obama winning the electoral college. In fact, the electoral college map is VERY favorable to Obama. This scenario is definitely possible and it would be the fiscal cliff Black Swan.

If you thought Congressional Republicans were going to be intransigent on the debt ceiling, multiply that by 10x. Any goodwill would be dead as the Republicans would feel a mandate based on the desires of the majority of the people, and Obama would be weak.

It would be NUTS!

Republican Speaker John Boehner. 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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What did Jeremy Corbyn really say about Bin Laden?

He's been critiqued for calling Bin Laden's death a "tragedy". But what did Jeremy Corbyn really say?

Jeremy Corbyn is under fire for describing Bin Laden’s death as a “tragedy” in the Sun, but what did the Labour leadership frontrunner really say?

In remarks made to Press TV, the state-backed Iranian broadcaster, the Islington North MP said:

“This was an assassination attempt, and is yet another tragedy, upon a tragedy, upon a tragedy. The World Trade Center was a tragedy, the attack on Afghanistan was a tragedy, the war in Iraq was a tragedy. Tens of thousands of people have died.”

He also added that it was his preference that Osama Bin Laden be put on trial, a view shared by, among other people, Barack Obama and Boris Johnson.

Although Andy Burnham, one of Corbyn’s rivals for the leadership, will later today claim that “there is everything to play for” in the contest, with “tens of thousands still to vote”, the row is unlikely to harm Corbyn’s chances of becoming Labour leader. 

Stephen Bush is editor of the Staggers, the New Statesman’s political blog.