Internal Revenue Service (IRS) security incident history
Hacking, data breaches and other security incidents involving Internal Revenue Service (IRS), with related coverage.
Incidents: 2 · Most recent
IRS official alleges personal data leak and sues
An Internal Revenue Service official alleged that the IRS had leaked their personal information to a news site. The official filed a lawsuit against the IRS.
Read on The New York Times ↗IRS contractor employee leaked data on 405,000 taxpayers
405KImpact: Tax return information of 405,000 taxpayers
An employee of an IRS contractor leaked taxpayers' tax return information. The scale of the damage confirmed in February 2025 was 405,000 taxpayers, about six times the previously reported figure. The IRS pursued improvements to information security, and Donald Trump filed a lawsuit in January 2026 seeking $10 billion over the leak.
Related reports: 10 · last report →