The probe adopted claims by a whistleblower that self-employed employees had been being charged out at PAYE charges.
The allegations had been made earlier this 12 months and concerned labour equipped to Balfour Beatty Vinci (BBV).
HS2 stated an investigation is underway and BBV has “applied further monitoring and controls.”
Labour provide specialist Danny Sullivan Group is co-operating with the investigation.
The agency provides a number of hundred employees throughout completely different HS2 websites that are persevering with to function as regular whereas the probe is underway.
A Danny Sullivan Group assertion stated: “We’re conscious of the allegations which have been raised in relation to HS2. As a enterprise with a protracted and respected historical past we take these allegations extraordinarily severely and are co-operating absolutely with the continuing investigation.
“We’ve got acted swiftly to reply to the data, commissioning an in depth and thorough inner assessment, which stays ongoing.”

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