Its investigation will stretch back to July 2014 and comes after theABC made a $600,000 "contrition payment",then the highest ever agreed between an employer and the wages watchdog,in June last year for underpaying 1907 casual workers a total of almost $12 million.
The ABC launched the review in the wake of thecasual pay scandal,which was caused by its failure to pay wages that covered workers'full entitlements.
"The ABC takes very seriously its obligations to ensure all employees are paid correctly,"the ABC's HR chief,Monica Vagg,wrote in an email to staff.
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"We have commenced a review of employees who have been paid a buyout or were engaged on a band one classification to ensure that they have been paid the correct amounts under the current and former ABC enterprise agreements."
The ABC's review is expected to take months and will likely focus on its news division,where most of the 1950 affected employees work.
Sinddy Ealy,the ABC section secretary at the Community and Public Sector Union,welcomed the ABC's review of staff on buyouts.