The Wisconsin Department of Revenue says nearly 111,000 tax ID numbers were mistakenly posted online for more than three months.
The department said Tuesday the Social Security numbers or federal employer ID numbers were included in a real estate report.
The report was available from April 5 through July 23. The department says it has contacted appraisers and real estate organizations asking them to destroy the report after being notified that it contained personal, confidential information for some sellers.
A Revenue Department spokeswoman tells the Wisconsin State Journal (http://bit.ly/NUAPH9) it's unclear how many of the tax IDs posted online were Social Security numbers.
The confidential information was imbedded in a file that was erroneously posted online with the 2011 property sales report. That report was downloaded 138 times.