The Shadow Chancellor has denied the Labour Party would stall extra powers being devolved to Scotland just because they want longer to examine the Prime Minister's English votes for English laws proposal.
Ed Balls told Good Morning Britain it was "a complete nonsense" and part of David Cameron's attempts to hold a "fractured" Conservative Party together.
He added, "David Cameron's proposal could end up with him saying, 'I want two parliaments'."
Child benefit would see cuts for the first two years of a Labour government, Ed Balls is expected to announce.
The shadow chancellor will present a 1% cap on rises in the help for parents as one of the "tough decisions" necessary to deal with the deficit if the party takes power next year - claiming it will save the taxpayer £400 million over five years.
He will seek to soften the blow by cutting ministers' pay by 5% and then freezing it until the party is able to "balance the books".
Addressing activists at the Opposition's final annual conference before the general election in May, he will vow not to "flinch from the tough decisions" needed to deal with the economy.
He will tell the Manchester gathering:
I want to see child benefit rising again in line with inflation in the next parliament.
But we will not spend money we cannot afford. So for the first two years of the next parliament we will cap the rise in child benefit at 1%.
It will save £400 million in the next parliament. And all the savings will go towards reducing the deficit.
Shadow Chancellor Ed Balls as he left an opponent bloodied in the annual football match between Labour and Lobby journalists.
The shadow chancellor was involved in a nasty clash with Northern Echo hack Rob Merrick as the politicians struggled to overturn a goal deficit at Manchester City's Etihad complex.
The pair were contesting a 50-50 ball on the edge of the Lobby penalty area when a stray elbow from Balls left a slash under the reporter's right eye.
Merrick had to leave the pitch for medical treatment as blood covered his shirt - but later returned to be named man-of-the-match.
Ed Balls has been ordered to pay more than £1,000 in fines and costs and has had five points put on his driving license after he admitted failing to stop after a minor road collision.
A district judge said the incident in the shadow chancellor's constituency of Morley and Outwood, West Yorkshire, was "at the lower end of the scale of seriousness".
The judge also rejected the option of a total driving ban.
Mr Balls hit the bumper of another car when he was moving out of a car park next to the Labour Unity Club, in Morley in April, causing minor damage.
The Labour politician already had three points on his license after going through a red light in central London in 2012.
Shadow chancellor Ed Balls could be banned from driving today for failing to stop after bumping into another car.
The Labour front-bencher claims he was unaware he damaged another vehicle as he attempted a "tight manoeuvre" in his constituency of Morley and Outwood in West Yorkshire on April 5.
His office said he would not be contesting the charge and would respond to Leeds Magistrates in writing.
The offence of failing to stop after an accident can incur five to 10 penalty points, disqualification, a fine of up to £5,000 or, in the most serious cases, a jail sentence of up to six months.
Mr Balls is understood to have three points on his licence already - and will be in line for a ban if he ends up with 12 or more.
More business and enterprise means "prosperity and economic security for us all", according to David Cameron
In a major speech on the economy to be given alter today, the PM is expected to say:
As part of our long-term economic plan we are backing business and ensuring our budding entrepreneurs get the finance and support they need to kick-start and grow their businesses.
Business and enterprise mean more jobs for hard working people; more opportunities for people to break out on their own and be their own boss; and more prosperity and economic security for us all.
Ed Balls will criticise the Conservatives for cutting taxes "at the top" and doing nothing to help those on low incomes increase their wealth.
In a speech given in Bedford, Mr Balls will say:
We know the Tories' real economic plan - it's to cut taxes at the top and hope that wealth will just trickle down.
Having already cut taxes for millionaires in this Parliament, they're champing at the bit to do it again if they win the election - cutting the top rate of tax for people earning over £150,000 again from 45p to 40p. Another tax cut worth £3 billion for the richest 1% of our country.
David Cameron and Ed Balls will both set out what they want to see from the economy in separate speeches later today.
The Prime Minister will announce a £100 million cash injection into the "Business Bank", where the Government provides loans to entrepreneurs looking to start their own business.
The Conservative party leader will also claim the Government has reached a significant milestone by awarding the 20,000th loan to an entrepreneur.
However, Labour's Ed Balls will hit out at the drop in real-terms wages and criticise the Government for failing to act.
The Shadow Chancellor is expected to say average earnings having fallen by £1,600 in real terms since 2010, the current parliament will be the first since the 1920s when real earnings will be lower at the end than they were at the beginning.
Shadow Chancellor Ed Balls is to set out how Labour would help nurture British business by maintaining the lowest rate of corporation tax in the G7 group of major industrialised nations.
At a speech in London, Mr Balls will say: "The last Labour Government left Britain with the most competitive rate of corporation tax in the G7 and we are committed to maintaining that position."
However he will also argue that a further cut in corporation tax next year is not "the right priority", instead committing Labour to a freeze on business rates that would affect 1.5 million business properties.
He will say the aim of Labour's business tax approach will be to make the UK "a great place to do business, not simply a cheap place to shift their profits".
Shadow chancellor Ed Balls said the Prime Minister's actions in Brussels this week were "catastrophe for Britain and the British national interest."
"We won't be influential in the world, unless we are influential in Europe," he told BBC One's The Andrew Marr Show.
"I've never seen a negotiation so cack-handed," Mr Balls said about David Cameron's failure to stop the appointment of Jean-Claude Juncker as the new head of the European Commission.
Mr Balls said about the Prime Minister: "He's weak, he's lost control, he's on the back foot, Britain is suffering. I think it's catastrophic for Britain."