The Office for National Statistics (ONS) said the change would reclassify Network Rail as a public-sector company rather than as a private one, which will add £30 billion to public sector net debt, in comparison with the 2012/13 tax year. Network Rail is a state-owned company that manages Britain's railway network.
The ONS also said that it is required to further assess the correct treatment of the transfer of Royal Mail's historic pension assets and liabilities to the government prior to its privatization.
But, it added, the assessment will likely increase public sector net borrowing recorded for April 2012 by £9 billion.
In another development, the statistics agency offered revamping what is included in the government's headline public finances measure as it is “no longer fit for purpose”. However, the ONS said, the move could add another £82 billion to the main measure of public debt.
This comes as Britain's public sector net debt, excluding financial sector interventions, stood at £1.207 trillion at the end of October 2013, equivalent to 75.4 percent of gross domestic product.