Treasurer Jim Chalmers has defended Treasury’s budget forecast that investor tax changes would shave only 2 per cent off house prices over two years and increase rents slightly, as economists and the opposition call for the department’s housing modelling to be released.

National home values fell for a fifth straight month in August and average prices are now 3.6 per cent below their peak, with larger price falls (7.1 per cent) in Sydney.

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