The Office for Statistics Regulation launched the probe after the figure became the centrepiece of the prime minister's attack on the opposition in Tuesday night's TV debate, sparking a barrage of condemnation from Labour's shadow cabinet.
Mr Sunak repeatedly pointed to analysis by Treasury civil servants showing a 38.5bn black hole in Sir Keir Starmer's spending plans, leading to a claim that each working household would pay 2,094 more in tax under a Labour government.
However, Mr Sunak faced a setback when the Treasury refuted his claim, revealing that the 2,000 figure was spread over four years, with a letter from the Treasury's permanent secretary stating that the costings were not from impartial civil servants.
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