If a decision was made to deport the tycoon, he would be sent back to Finland or Germany, according to a legal expert.
The consideration of deportation comes after the Herald revealed the tycoon -- who is wanted in the United States -- had not declared a dangerous driving conviction on his residency application.
Applicants for residency are compelled to declare any brush with the law -- and Dotcom's residency form clearly shows he denied having a dangerous driving conviction.
The form was filled in eight months after he was caught doing 149km/h in a 50km/h zone.
Dotcom pleaded guilty under the name "Kim Schmitz" in the North Shore District Court.
Immigration NZ said yesterday it was checking on the existence of a conviction and confirmed Dotcom had not declared it.
"If any adverse information is obtained INZ will assess if there is any liability for deportation."
It also admitted it never made its own checks when it granted Dotcom residency.
The statement said Dotcom had been here for just 12 months and there was nothing to suggest he had been charged.
On Wednesday Dotcom told the Herald he believed speeding issues had been disclosed by his advisers.
Told that they had not been, he said: "Oh really? That's not good, obviously."
Immigration NZ has previously stood by its handling of Dotcom's residency, which was granted after the SIS raised concerns and after Dotcom revealed new convictions on arriving in New Zealand.
A review had been conducted and "found that the correct procedures and processes were indeed followed".
A member of the NZ Law Society immigration law committee, John McBride, said people subject to deportation would be sent to their country of origin.
Dotcom holds Finnish and German nationality so could be sent to either country.
Mr McBride said the process took more than a year if it was decided the failure to disclose the conviction warranted deportation.
The person who was under question would be asked for an explanation, with a report going to Immigration minister Michael Woodhouse.
Decisions could be appealed.
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Kim Dotcom
The story so far September 10, 2009: Kim Dotcom is pulled over doing 149km/h in a 50km/h zone in Albany on Auckland's North Shore. September 14, 2009: Dotcom pleads guilty to dangerous driving through a letter presented by his lawyer to the North Shore District Court. June 3, 2010: Dotcom signs his residency application, revealing two convictions wiped under Germany's clean slate law. He ticks "no" to having a "dangerous driving conviction". November 1, 2010: Dotcom has residency granted for himself and his family. December 15, 2010: Dotcom arrives in New Zealand as a resident.January 20, 2012: Police raid the Dotcom mansion, arresting the tycoon and three others on FBI charges of criminal copyright violation.
By David Fisher of the New Zealand Herald
