By bizn_fun 
Some analysts have estimated that Reeves will have to raise tens of billions of pounds through either increasing taxes or cutting spending in order to meet her rules which she has described as “non-negotiable”.
The two main rules are:
Before the 2024 general election, Labour promised not to increase income tax, National Insurance or VAT for working people.
The IFS said it would be possible for the chancellor to raise tens of billions of pounds a year more in revenue without breaking these manifesto promises, but this would not be straightforward.
It said there are “serious constraints” on the next four biggest taxes – corporation tax, council tax, business rates and fuel duties – while “some other tax-raising options would be especially economically harmful”.
The IFS’s comments came in an extract from its annual Green Budget, which analyses the challenges facing the chancellor.
In it, the think tank urged wider reform to the tax system which would align “overall tax rates across different forms of income”, something it says would be “fairer and more growth friendly”.
“There is an opportunity to be bold and take steps towards a system that does less to impede growth and works better for us all,” said Helen Miller, director of the IFS and one of the authors of the report.
It suggests reforms to property tax and capital gains tax as “good places to start”.