The document - entitled 'For the Many, Not the Few' - states: 'We will measure our economic success not by the number of billionaires , but by the ability of our people to live richer lives.'
Mr Corbyn admitted after the speech that the costings did not cover proposed nationalisations 'because we don't know what the share price would be at the time that we do it'.
The National Grid is valued at £40billion.
The respected IFS think tank said the manifesto plan would take taxes back to the highest level in 70 years.
But director Paul Johnson said he was dubious that it could bring in the revenue Labour claimed, suggesting the actual figure would be more like £20billion.
'They are suggesting a £50billion increase in tax, which if it were to be implemented would take the tax burden in this country to the highest level it's been in about 70 years,' he told the BBC.
'But, actually I think there's an awful lot of uncertainty about whether you could actually raise that amount of tax, they're talking about very, very large increases in taxes on companies which would likely reduce the amount of investment that they do.
'So I think the actual amount you could get from these policies – it certainly runs into the tens of billions – but probably doesn't reach the £50billion that Labour are claiming.'
Tim Knox, Director of the Centre for Policy Studies, said: 'High earners are the geese that lay the golden eggs: the top 1 per cent of taxpayers already pay about 30 per cent of all income tax.
'Forcing them to pay more might be politically tempting but is economically crazy. Many of 'the geese' will either fly off to more attractive countries or just stop laying the golden eggs.'
The left-leaning Institute for Public Policy Research has also questioned the move, pointing out that the 2012 decision to reduce the top rate of tax from 50p to 45p is thought to have cost the Exchequer only £100million
