Businesses have urged the government not to rush tax changes through parliament, warning Australia's global competitiveness is under threat.
Legislation for controversial changes to the capital gains tax discount and negative gearing is expected to be introduced in the next sitting fortnight, which begins on Monday.
Labor will likely be able to push the legislation through parliament with the support of the Greens, who hold the balance of power in the Senate.
Entrepreneurs and venture capitalists argue the proposal to remove the 50 per cent capital gains discount in favour of a minimum 30 per cent tax and indexation of the cost base would cause talent and capital to flee the nation in search of a more favourable tax regime.