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As part of the review, the consumer watchdog will examine Aussie and CBA's role in mortgage distribution services, including how they provide mortgage brokers with access to a panel of lenders.
ACCC says it feels CBA's Finconnect business, which distributes mortgages through professional firms, could be a stumbling block to the deal, given the extent of crossover in mortgage broking.
The commission will consider whether Aussie Home Loans is a ''unique or a vigorous'' competitor in the mortgage market and if CBA will have the "ability and incentive to foreclose its banking competitors from accessing".
It will also look into whether the move to majority ownership ''will increase prices or profit margins or decrease the quality of products'' on offer.
As reported in Australian broker last month, CBA announced its plan to increase its holding in Aussie Home Loans to 80% in December. John Symond will continue as executive chairman of Aussie and will retain the outstanding 20% shareholding.
The deal also gives CBA an option to move to 100%, which the bank is expected to act upon by August 2018.
Industry participants have until January 31 to provide their thoughts and inputs, with the ACCC to announce its findings on March 7.
