This Office for Budget Responsibility (OBR) tweeted after Chancellor George Osborne made his Budget announcement:
Labour is to open up its election pledges to scrutiny by a spending watchdog set up by George Osborne in its battle to convince voters that it has economic "iron discipline".
Ed Balls will tell activists tomorrow that he needs to be "straight" with the country about the tough choices the party would have to take in office, admitting that budget cuts will need to be made to balance the books.
In a push to boost the party's fiscal credibility, the shadow chancellor intends to show how Labour's "sums add up" in the approach to the 2015 election by asking the Office for Budget Responsibility (OBR) to independently review the costings of every spending and tax commitment in its manifesto.
Mr Balls has written to OBR chairman Robert Chote setting out the audit request, which party sources said appeared to be possible under the terms of its charter.
Treasury minister Greg Clark said that the row over whether David Cameron misrepresented the views of the Office for Budget Responsibility of the impact of austerity measures on the economy was over a technical detail.
Mr Clark said: "It's a technical point, but it is an important one. Every budget since we came into office has been analysed by the OBR. Because Government spending is part of national income, any reduction in it has always been part of the forecast.
"What David Cameron was addressing in his speech - was to where there has been an extra contribution to the relatively slower growth than was expected from policy.
"What Robert Chote and the OBR have said is they don't think that is the case, that actually the causes of the slower growth than they forecast, were oil prices, the financial sector and the Eurozone."
There's been embarrassing criticism of the Prime Minister's keynote speech on the economy from the independent economic watchdog set up by his government. Yesterday, David Cameron claimed spending cuts had not damaged growth and that the Office for Budget Responsibility agreed.
But today the head of that watchdog said the opposite was true.
From Westminster ITV News political correspondent Carl Dinnen reports:
The head of the independent fiscal watchdog the Office for Budget Responsibility criticised David Cameron for misrepresenting its views on the impact of austerity measures on the economy.
Here is what the Prime Minister said:
Shadow Chancellor Ed Balls said on Twitter that the letter from the Office for Budget Responsibility to Number 10, rebuking David Cameron over claims he made about the economy, was 'deeply embarrassing' for the Prime Minister.
Sir Alan Budd, the first chairman of the Office for Budget Responsibility , said he believed the OBR had rebuked David Cameron because he "made an error'.
Sir Alan was talking to BBC Radio 4's PM program.
In a letter sent to Number 10, the chairman of the Office for Budget Responsibility Robert Chote, said that it believed fiscal consolidation had "reduced economic growth over the past couple of years".
The Office for Budget Responsibility has published a letter sent to Number 10 by its chairman in which he took exception to claims made by David Cameron.
In the letter, Robert Chote criticised the PM's claim that austerity measures were not responsible for a dip in growth:
Mr Chote included the following quote from Mr Cameron's comments in his letter to Number 10: