© GettyThe Treasury will disclose the future costs of schools and hospitals built using the Private Finance Initiative for the first time
Every household in Britain faces having to pay £42,000 to cover the cost of public sector pensions, official figures show.

The Treasury will today reveal that the liabilities from the pensions of public sector workers have jumped from £770 billion to £1,100 billion in two years. The figures are contained in full accounts for all Whitehall departments, which are being published together for the first time to show what public finances would look like if they were subjected to the same scrutiny as a private company.

The accounts will also disclose the future costs of schools and hospitals built using the Private Finance Initiative for the first time.

They will show that the costs of PFI deals have increased seven-fold, from £5.1 billion to more than £40 billion, including future liabilities, and that the total "hidden" debt of 1,500 public bodies has reached an estimated £2,000 billion.

Jesse Norman MP, chairman of the PFI Rebate campaign, which is calling for a new code of conduct on the deals that are negotiated, said: "It is a watershed for our public administration to have a set of consolidated accounts across the public sector, including provisions and contingent liabilities for the first time.

"It has underlined the massive challenge facing the Government to take control of the debt situation, and it really brings out the need to make savings in PFI on both current and future contracts." PFI contracts are a way of creating "public - private partnerships" by funding public infrastructure projects with private capital.

The publication of the pension figures come as public sector unions are gearing up for further strike action this autumn over government plans to cut pension entitlements.

Matthew Elliott, chief executive of the TaxPayers' Alliance, added: "Taxpayers cannot escape the terrifying bill that we now face for public sector pensions.

"It is imperative that the Government reforms these schemes to make them sustainable into the future and what they are proposing are moderate changes.

"These incredible new figures will make it harder for trade unions to continue to resist these very necessary changes to make public sector pensions more affordable."

A Whitehall source said: "Many people would be amazed to know that until now the Government did not have a single set of accounts like any company would. After years of foot-dragging by the last government we have finally got a true picture of the liabilities that have been built up for future generations."

A majority of voters want public spending to be reduced further when the Coalition's £100 billion programme of cuts is complete, a poll suggests.

After the cuts, in 2015-16, government spending will be £713 billion, or 39.9 per cent of the economy. The YouGov poll for the Institute of Economic Affairs showed that 55 per cent of voters believe spending should ultimately be 35 per cent.