Ministers have been issued with a renewed warning over the affordability of public sector pensions as official figures showed total liabilities have risen to more than £1.3 trillion.
The Chartered Institute of Public Finance and Accountancy (Cipfa) - representing public finance professionals - said there was now "serious concern" over the long-term sustainability of the system.
A note by Cipfa on the UK Whole of Government Accounts (WGA) for 2013/14 said there had been an 11% increase in net public sector pension liabilities over the previous year - a rise of £130 billion.
The increase was one of the main drivers behind a £224 billion rise in overall public sector net liabilities - the difference between what the country owes and what it owns.
Cipfa said that in the five years from 2009/10 net liabilities had risen by £624 billion taking the total to £1.852 trillion, the equivalent of £69,363 for every household in the country.
"While our net expenditure is now on a downward trend, net liabilities continue to increase," said Cipfa chief executive Rob Whiteman.
The WGA, which cover all 5,500 public entities in the UK - including central government departments, public corporations, the health sector, arm's-length bodies and local government - is regarded as the most comprehensive set of audited government accounts.
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