Father rips into CBA over car loan

A Perth father has accused the Commonwealth Bank of being immoral after it loaned his 20-year-old son $15,000 at 17.8 per cent interest despite his only needing $5500 for a car.

Brian Borshoff said he was floored after looking at his son's contract to learn he could not make an early repayment or pay more than the agreed monthly sum on the four-year loan.

Mr Borshoff said his son had been keen to prove his independence and he was restricted in what he could to help him because he was an adult.

"Where is their moral compass and where is their duty of care?" he told 6PR radio on Friday.

"Where do you get off saddling a young person that is out there getting their education (and) working hard at a part time job?"

Mr Borshoff conceded it was not smart of his son to spend the extra money with the help of his friends.

He said his son was also offered car insurance through CommInsure at an annual premium of $1450 but instead obtained insurance elsewhere at $900.

It comes after ABC TV reported CommInsure whistleblower and sacked former chief medical officer Ben Koh's comments this week about systematic manipulation of medical reports, missing files and declining of claims that should have been accepted at the bank's insurance arm.

In a statement, a CBA spokesman said the bank always wanted to hear from customers with concerns.

"Customers can choose to make extra repayments and pay off their loan as quickly as possible," he said.

"Commonwealth Bank lends according to individual risk profiles, which take into account a number of factors including a borrower's ability to service that loan and their previous credit history."