The Chancellor's Budget calculations have been questioned by the respected independent economic analysts, the Institute for Fiscal Studies.
It criticised the "hotchpotch" of reforms that it warned may fail to raise as much income as predicted.
Labour have been granted an emergency question on Budget leaks in the House of Commons at 11.30am this morning, according to Sky News.
The Chancellor has jumped to defend a Budget that appears to target pensioners and, according to the IFS, may not be as neutral as claimed.
The Chancellor's announcement of freezing pensioners allowances caused widespread anger, but who will be affected by the "granny tax"?
Babies born in 2012 will be able to retire in 2092 after the Chancellor announced changes to the way retirement ages are calculated.