Commonwealth Bank chief executive Matt Comyn has suggested the capital gains tax overhaul should be limited to real estate and not hit productive investments in business.

Australia’s biggest business groups warn of an increasingly unpredictable tax system as the backlash against the capital gains tax overhaul continues.

The Commonwealth Bank boss speaks out about the government's tax changes.

Commonwealth Bank chief executive Matt Comyn has suggested the capital gains tax overhaul should be limited to real estate and not hit productive investments in business.

A day before Labor puts forward its tax changes in parliament, Chalmers has defended a policy that has opened up a political brawl on wealth creation and economic growth.

Business groups are demanding Labor’s tax changes be limited to homes, but the government is refusing to yield.