Even worse, if the IFS are right and the shortfall is bigger, say they ONLY raise £30billion from the top 5% of earners and a corporation tax rate that would still be the lowest in the G7, then they could still:
Get rid of tuition fees and restore maintenance grants (£11billion), fund free childcare with more money for Sure Start (£5billion), lift the public sector pay cap (£4 billion), increase ESA by £30 per week for those in work related activity group, scrap bedroom tax, implement the PiP legal ruling, restore housing benefit for U21s, scrap Bereavement Support Payment reforms, uprate Carers Allowance to the level of Job Seekers Allowance (£4 billion) and pay for the Barnet Formula consequentials of all this (£6billion) -- total £30 billion (figures from the document Funding Britain's Future that accompanied Labour's manifesto that outlined their spending proposals and costings).
Even if you disagree with those numbers, it has been shown by even the harshest criticisms of organisations such as the IFS that Labour's proposed changes would raise revenue (the only question is exactly how much) and that this revenue could then be spent on things such as those outlined above, making lives better for many people at the expense of a relative few.
The numbers can and will vary, but if the principle and political will is there, then doing things in a different way is entirely possible.