It also wants to assess the impact of non-cash incentives - such as overseas trips for brokers, or faster loan approval times for some firms.Alongside the up-front commission of about 0.65 per cent of a loan's value and a trailing commission of 0.15 per cent a year until the loan ends, the watchdog is looking at other incentives, such as bonuses for writing a large number of loans with a certain bank.

The review, announced by the government last year, is focused on mortgage broker remuneration structures and the role of bank ownership in the sector. 

Consumer groups have claimed that some mortgage brokers encourage customers to take on more debt than they need to maximise their commission, and ASIC will be requesting data on the size of broker-sourced loans.

It will also look at the quality of loans written by brokers, after the Australian Prudential Regulation Authority has previously said these home loans had a "materially higher" default rate, and must therefore be managed with extra care.

The request for data held by the banks comes after ASIC this week finalised the scope of its review, which will report to the government by the end of this year.

An ASIC document sent to industry participants said it would review the remuneration arrangements for staff at banks, mortgage aggregators, brokers and comparison websites.

"ASIC will review the remuneration arrangements of all industry participants forming part of the value distribution chain," the document said.