More taxpayer accounts may have been affected by a cyberattack than previously disclosed, NBC News reports.
The Internal Revenue Service said Friday that 700,000 households' tax data may have been compromised, which is approximately 390,000 more than initially reported. According to experts, the stolen accounts may cause an increase in false tax returns.
The agency said it will send mailings to affected taxpayers beginning Feb. 29.
"The IRS is committed to protecting taxpayers on multiple fronts against tax-related identity theft, and these mailings are part of that effort," IRS Commissioner John Koskinen said.