Treasury 'unconcerned' by July deficit
21 August 2013 Last updated at 17:15 BST
The government unexpectedly had to borrow money in July.
Usually in July, a surplus is recorded because of increased tax receipts.
The data from the Office for National Statistics remains subject to revision.
Speaking to the BBC's Rajesh Mirchandani, Treasury Minister David Gauke said: "You can't put too much weight on one month's numbers."
"Tax receipts are going up, and I think that's encouraging," he added.