In a dire warning the IFS added: “even in 2023–24 day-to-day spending on public services outside of health would still be almost 15 per cent lower in real terms that it was at the start of the 2010s."
The party said one in four private rented homes are classed as ‘non-decent’, meaning they are damp, cold, in disrepair or unsafe to live in.
The findings come as an FOI request revealed thousands of nurses have left the UK since the Brexit vote.
The 59-page manifesto contained few surprises, with most of the main policies trailed in advance.
More than 11,600 NHS staff from the EU have left the health service in the three years since the Brexit vote, including 4,783 nurses.
Boris Johnson, Dominic Raab, Iain Duncan Smith and Steve Baker could all be ousted by tactical voting campaigns.
The broadcasting corporation has been accused of editing audience reactions to show them clapping rather than laughing.
Boris Johnson’s party is expected to take 47 per cent of the vote in the December election.
"If people can no longer be held accountable with the truth a politics built on evidence and rationality ends.”