Treasurer Scott Morrison is under fire for using a controversial report to skewer Labor's negative gearing policy, after the report's authors clarified it was prepared before Labor's policy was announced and contained a crucial error.

The research, conducted by property forecaster BIS Shrapnel, predicted that abolishing negative gearing on established dwellings would wipe $19 billion from Australia's gross domestic product and push up rental prices by 10 per cent.

Mr Morrison seized on the report, describing it as "an indictment on Labor's policy". "What it shows is [that] they just haven't done their homework on this," he said.