Labour is predicting the government's plan to convert all England's state schools to academies could cost more than £1.3bn.
The party says the figure is based on a Parliamentary written answer which shows the government paid £66,000 per school for earlier academy conversions.
This would leave a black hole of more than a billion pounds in the education budget, Labour says.
The government says suggestions of a shortfall are "completely untrue".
Under the plan, announced by Chancellor George Osborne in his Budget last month, all state…