21 September 2012 Last updated at 07:03 ET
UK public sector net borrowing was £14.4bn in August, the Office for National Statistics has said, the biggest deficit for the month since records began.
The figure was marginally higher than for the same month last year.
Corporation tax receipts fell by 2.1% and benefits payments rose 4.9%.
The figures make it more likely that the government will fail to achieve its aim of wiping out the structural budget deficit by 2015.
The borrowing figures differ depending on whether the temporary effects of one-off financial transactions are included or excluded.
The April 2012 net borrowing figures included two one-off transactions to the government - £28bn from the transfer of the Royal Mail Pension Plan and £2.3bn following the closure of the Special Liquidity Scheme.
The ONS says that for the period April to August 2012, public sector net borrowing, excluding financial interventions such as bail-outs to the banks, was £31bn, £17.4bn lower than in the same period last year.
But if the effect of this Royal Mail and other transactions are stripped out, then public sector net borrowing for April to August 2012 actually increased 22% to £61.3bn, £12.9bn higher than in the same period last year.