The Australian Securities and Investments Commission will soon ask the country's biggest banks to hand over detailed data on the commissions and other non-cash benefits they give mortgage brokers for arranging loans, alongside information on how these loans perform.

Within the next fortnight, ASIC will send requests to 12 lenders, including the Big Four banks, requesting full details on the various payments that banks make to mortgage brokers, as it tries to assess how these incentives influence broker behaviour.

The requests for information, which will also be sent to key mortgage broking groups, comes as ASIC ramps up its review of mortgage broking and its growing role in the $1.3 trillion home loan sector.

Mortgage brokers arrange more than half of all new home loans, and ASIC wants to determine how banks' payments of commissions and other incentives affect outcomes for customers.