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"Significant" and "deep" spending cuts will be needed to meet George Osborne's Budget aims, an independent economics think tank has warned.
Paul Johnson, the director of the Institute for Fiscal Studies, told BBC Radio 4's Today programme: "In order to meet the Chancellor's aims, you do need some significant and some really quite deep spending cuts in 2016/17 and 2017/18, and then he takes his foot right off the accelerator in 2019/20.
"So you get big spending cuts in the first couple of years and then spending increases right at the end."
Mr Johnson also accused the Chancellor of not giving enough detail about how welfare cuts and a clampdown on tax avoidance would deliver savings.
"I think it's rather disappointing that so far in, we still haven't heard any details about this", he said.
Public sector workforce will be "challenging" according to the Institute for Fiscal Studies, with worker numbers outside of the NHS and schools likely to fall between 30 to 40 percent in the next five years.
The public sector workforce grew by over 600,000 over the 2000s. Even so the scale of the reductions expected over the next few years looks challenging.
If delivered, the 1.1 million drop in general government employment forecast by the OBR between 2010/11 and 2018/19 would be almost three times larger than the previous drop during the early 1990s.
The workforce is a useful prism through which to look at the effects of cutting total spending whilst protecting the NHS and schools budgets from cuts.
The public sector outside of the NHS and schools faces a "very challenging" 40 percent cut in its workforce over the next five years if those areas continue to be protected by Government, a new report by the Institute for Fiscal Studies has warned.
Independent forecasts released by the Office for Budget Responsibility in December predicted a 1.1 million reduction in general government employment between 2010/11 and 2018/19 as a result of austerity measures.
The IFS report found that this would be the biggest cut in the public sector workforce for more than half a century, "dwarfing" cuts of 350,000 seen in the early 1990s and "dramatically changing the nature of the UK labour market".
The impact of the Government's planned cuts in public services after the next election will be "hugely challenging", a leading economic thinktank has said, warning against a "false sense that all is now well".
The Institute for Fiscal Studies railed against overconfidence after a return to healthy growth in the economy, saying 60% of Chancellor George Osborne's cuts are still due to take effect from next year.
However, figures from Oxford Economics predicted 2.6% growth in GDP this year, raising the prospect that continued growth could remove the need for Mr Osborne's austerity plans to be implemented in full.
The Institute for Fiscal Studies (IFS) said the Government's figures on take home pay do not reflect what has happened to household incomes overall.
IFS director Paul Johnson told BBC Radio 4's Today programme that although the Government used "a perfectly sensible set of numbers", there were "two problems" that need to be taken into account.
He said: "First, we have other sets of data - the Office for National Statistics publishes an average weekly earnings index. That went up quite a lot less quickly than inflation in the most recent months.
"And of course they are not taking account of reductions in things like benefits which were occurring over the time. So if you are looking at household incomes, that will be different from what's happened to take home pay."
The Institute for Fiscal Studies (IFS) has presented its analysis of Chancellor George Osborne's Autumn Statement.
ITV News economics editor Richard Edgar reports:
Institute for Fiscal Studies presenting forensic analysis of the Autumn Statement. Govt's books improved more by cuts than higher tax income
Ifs - Broader public spending falling 20% by 2019 if chancellor keeps to current plans - eye watering cuts!
Fuel duty freezes are costing the govt £6billion a year - very significant at a time of cuts, says IFS