A nine-month long investigation by the IRS into a hacking attack revealed in May last year found that criminals made attempts and potentially gained access to an additional 390,000 taxpayer accounts between January 2014 and May 2015.
Another 295,000 taxpayer transcripts were the targeted but access was not successful, according to the IRS.
Attackers in that time tried to gain access to personal tax information through the agency’s Get Transcript” online application, which allows taxpayers to look up previous returns.
In May, when the problem was discovered, the agency said tax return information of about 114,000 U.S. taxpayers had been illegally accessed and another 111,000 unsuccessful attempts had been made. In August, the IRS increased that figure to include 220,000 additional incidents were personal information was hacked and another 170,000 failed attempts.
The IRS will send mailings to all new victims of the hacking beginning on Feb. 29. The “Get Transcript” web application wil continue to remain offline.
If you receive such a letter or believe that you had been a victim of tax refund fraud or identity theft, follow our guide to getting your refund back and accounts secured.