The commission funded qualifications offered by FutureCOL and undertook the audit to ensure the institute was meeting its funding conditions.
FutureCOL received $1.2 million of funding in 2017, $1.68 million in 2016 and $1.63 million in 2015.
Earlier this month, TEC chief executive Tim Fowler said FutureCOL had asked it to revoke its 2018 funding, but added payments to the organisation had ceased before this.
Among the concerns raised in the audit was the quality of recordkeeping and integrity of historical student data reported by the institute from 2014 to 2016.
In one instance, FutureCOL claimed funding for a student in 2015 who attended just five days, four of which were in the first week, with no achievements.
Notably there was allegedly "no evidence" of domestic status for two students in 2016 and no enrolment form or evidence of domestic status for another student between 2014 and 2015.
The audit highlighted inconsistencies across the enrolment process, stating students who stopped attending the institute had not been withdrawn in a timely manner.
One focus area of the audit related to funding claimed by FutureCOL for staff undertaking professional development.
It found $27,000 had been incorrectly claimed for five staff in 2013.
Guha, a Singapore-born University of Otago graduate, was once an international student himself and expressed an interest in growing FutureCOL's roll with foreign and domestic students.
He replaced long-time chief executive Liddy Trotter in April 2016 after being shoulder-tapped for the job.
He entered the role after holding positions at the Southern Institute of Technology in Invercargill, including chief financial officer and corporate deputy chief executive.
Guha is now incoming chief executive officer of Malvern International, an education group based in Singapore.
Liddy said she hadn't seen the audit report so wasn't in a position to comment on it.
Hawke's Bay Today was unable to reach Guha for comment.