The federal opposition says cutbacks at the Australian Taxation Office have undermined the agency's ability to do its job properly.
A joint investigation by Fairfax and the ABC has found a series of errors and actions by the ATO which led to small businesses and individuals being financially crippled.
Labor leader Bill Shorten said ATO staff were being asked to do more with less and whistleblowers were to be commended for identifying "scandalous" problems.