The information, which was removed about an hour later after the ABC informed the ATO about it, was said to show the ATO's tactics for investigating fraud and its bid to obtain powers that are normally granted only to police and intelligence bodies.
The ABC reported that the instructions were published on LinkedIn and included ways of bypassing passwords and obtaining data even if the phone battery was dead and there was no SIM in the device.
Cellebrite is said to be the company that helped the FBI obtain data from an iPhone 5C belonging to one of the terrorists involved in an attack in San Bernardino, California, in December 2015, after Apple had refused to do so.
Last month, a Fairfax Media report said many government agencies, including ASIC, the AFP, and the Department of Defence, were using Cellebrite's services.
The ABC quoted an ATO spokeswoman as saying: "Security staff use a range of technologies, including Universal Forensic Extraction software provided by Cellebrite, as part of our digital forensic capability to support investigations."