The UK is facing "two parliaments of pain" following the "breathtaking" damage to the economy, the Institute for Fiscal Studies (IFS) has warned.
The government must close a £90bn hole to bring the budget into balance, the independent think-tank said.
That would cost every UK family £2,840 per year by 2017-18 in higher taxes or public spending cuts, it added.
The news comes after Chancellor Alistair Darling forecast the biggest budget deficit in UK post-war history.
Shadow chancellor George Osborne said the IFS calculations showed that the country was facing a "secret tax bombshell"
...
"The Treasury's assessment of the fiscal damage wrought by the current economic and financial crisis is breathtaking," said IFS director Robert Chote.
"It will require two full parliaments of mounting austerity to repair."
...
The IFS pointed out that the government is planning a huge cut in public investment, reducing it by more than half, and reversing its previous approach that aimed at preserving capital investment.
This would mean much less money available was to build new schools, roads, and hospitals after 2011.
In addition, it pointed out that all of the very modest increase planned in current spending (on wages and running costs) would be taken up with the higher cost of debt interest and paying out more social security benefits.
This meant that departmental spending (including areas such as health, education, and policing) would need to fall by 2.3% annually.
...
Despite the headline increases in taxes on the rich, the IFS said these will raise relatively little money in comparison with the size of the budget gap.
Only 10% of the gap will be raised by new taxes, while 40% will be accounted for by spending cuts up to 2014, it added. The remainder (50%) is scheduled for the parliament after next.