The banks are now less conservative in counting expected rental income when assessing loan applications, said the four sources. In September, about a third of new bank mortgage lending was for investment. On Nov. 12, NAB will also halve its discount on rental income to 10%, including for Airbnb-like short-term rentals, the sources said. NAB, Westpac and ANZ trail market leader Commonwealth Bank of Australia (CBA.AX), which has a quarter of the mortgage market. Commonwealth continues to apply a rental income discount of 20% on mortgage applications, a sixth source said.

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