The Home Office has admitted figures released on Thursday suggesting the Met’s funding would be slashed by 10 per cent were incomplete.
The data from the House of Commons Library left out a £173 million grant made each year to the Met in recognition of its capital city status.
This had been included in the total for 2015/16 but not for 2016/17, a spokeswoman said.
It still leaves Police and Crime Commissioners facing the prospect of hiking council tax to make up the now-reduced shortfall. The Met has lost about £10m from its grant.
It comes weeks after Chancellor George Osborne told the Commons: “There will be no cuts in the police budget at all. There will be real terms protection for police funding. The police protect us, and we're going to protect the police.”
He was speaking a fortnight after the Paris terrorist attacks that claimed 130 lives.
Met commissioner Sir Bernard Hogan-Howe warned in October that funding cuts could put London “at risk” in the event of a “roaming firearms attack”.
But fears all 1,017 of the Met’s volunteer PCSOs would face the axe were quelled this week after Sir Hogan-Howe told the London Assembly each of the capital’s 629 police wards would hang on to at least one dedicated Pc and PCSO next year.
