The Internal Revenue Service said Friday that an investigation into last year’s data breach in the online Get Transcript application revealed it affected hundreds of thousands more taxpayers than originally believed.

Last May, the IRS revealed that identity thieves had used the online application to access the tax returns of 104,000 taxpayers (see IRS Detects Massive Data Breach in ‘Get Transcript’ Application). Organized criminals used taxpayer-specific data that they acquired from non-IRS sources, including Social Security information, birth dates and street addresses. In August, the IRS admitted that another 220,000 taxpayers had been affected (see Extra 220,000 Hit by IRS ‘Get Transcript’ Breach).

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