Mealey's (August 18, 2015, 10:38 AM EDT) -- WASHINGTON, D.C. — Amending a statement it made in May about a data-breach incident involving the “Get Transcript” feature on its website, the Internal Revenue Service on Aug. 17 said that a further investigation of the incident revealed that more than 300,000 U.S. taxpayers may have had their personal information compromised (IRS Statement on the ‘Get Transcript’ Application, IRS).

(Additional statement available. Document #97-150827-036X.)

Authentication Process

In its initial statement on May 26, the IRS said that in mid-May it became aware that “unusual activity” had...