Cross References
- www.irs.gov (May 26, 2015)

On May 26, 2015, the IRS announced that criminals used taxpayer-specific data acquired from non-IRS sources to gain unauthorized access to information on approximately 100,000 tax accounts through IRS' "Get Transcript" application. This data included Social Security information, date of birth, and street address.

These third parties gained sufficient information from an outside source before trying to access the IRS site, which allowed them to clear a multi-step authentication process, including several personal verification questions that typically are only known by the taxpayer. The matter is under review by the Treasury Inspector General for Tax Administration as well as the IRS' Criminal Investigation unit, and the "Get Transcript" application has been shut down temporarily. The IRS will provide free credit monitoring services for the approximately 100,000 taxpayers whose accounts were accessed. In total, the IRS has identified 200,000 total attempts to access data and will be notifying all of these taxpayers about the incident.

The IRS determined that unusual activity had taken place on the application, which indicates that unauthorized third parties had access to some accounts on the transcript application. Following an initial review, it appears that access was gained to more than 100,000 accounts through the Get Transcript application.

In this sophisticated effort, third parties succeeded in clearing a multi-step authentication process that required prior personal knowledge about the taxpayer, including Social Security information, date of birth, tax filing status and street address before accessing IRS systems. The multi-layer process also requires an additional step, where applicants must correctly answer several personal identity verification questions that typically are only known by the taxpayer.

The IRS temporarily shut down the Get Transcript application after an initial assessment identified questionable attempts were detected on the system in mid-May. The online application will remain disabled until the IRS makes modifications and further strengthens security for it.

The matter is under continuing review by the Treasury Inspector General for Tax Administration and IRS offices, including Criminal Investigation.

The IRS notes this issue does not involve its main computer system that handles tax filing submission; that system remains secure.

On the Get Transcript application, a further review by the IRS identified that these attempts were quite complex in nature and appear to have started in February and ran through mid-May. In all, about 200,000 attempts were made from questionable email domains, with more than 100,000 of those attempts successfully clearing authentication hurdles. During this filing season, taxpayers successfully and safely downloaded a total of approximately 23 million transcripts.

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