Banking regulator APRA has fired warning shots at major lenders this week, following an up-tick in riskier forms of lending as interest rates fall.

From February next year, Australia's banks will soon get new rules that will limit how many "high-risk" large home loans they can issue to customers.

It comes after the total value of new investment loans rose almost 18 per cent to $39.8 billion in the September quarter alone.

• Guest: Simon Birmingham, CEO of the Australian Banking Association and former federal Coalition minister
• Producer: Grace Stranger