Oklahoma Tax Commission
ent_0f438d94016e895b
Disclosures
7
State AG · 7 jurisdictions
Multi-filing incidents
1
incidents joining 2+ filings here
Max affected reported
160,830
nationwide · State AG TX
Leak-site claims
0
none in sample
Identity resolution
- Canonical name
- Oklahoma Tax Commission
- Normalized
- oklahoma tax commission— dedupe via name-norm; Microsoft / MSFT collapse to one row
- GLEIF LEI
- No match
- SEC EDGAR CIK
- None — not an SEC registrant
- Domain
- tax.ok.gov
Disclosure history (7)newest first
- Texas State AGas victim2026-03-30
Oklahoma Tax Commission based in Oklahoma City, Oklahoma, a governmental entity entity reported a data breach to the Texas Attorney General. The breach was discovered on 2026-03-10 and reported on 2026-03-30. 4,177 Texas residents were affected. 160,830 individuals affected in total. Types of information involved: Name of individual;Social Security Number Information. Consumers were notified via U.S. Mail.
- Maine State AGas victim2026-03-27
Oklahoma Tax Commission reported unauthorized access to W-2 and 1099 files in its OkTAP system between July 5, 2024, and December 20, 2025. The breach affected 14 Maine residents, exposing names and Social Security numbers. The incident was discovered in December 2025. The OTC engaged forensic specialists, cooperated with the IRS, and provided 12 months of credit monitoring to affected individuals.
- New Hampshire State AGas victim2026-03-27
Oklahoma Tax Commission notified New Hampshire AG of unauthorized access to OkTAP system between July 5, 2024 and Dec 20, 2025. 18 NH residents affected; data included names and SSNs. Discovered Dec 2025. Notifications sent March 27, 2026. Response included forensic investigation, IRS cooperation, system safeguards, and 12-month credit monitoring.
- California State AGas victim2026-03-27
The Oklahoma Tax Commission (OTC) notified individuals that unauthorized access occurred to W-2 and 1099 files in the OkTAP system between July 5, 2024, and December 20, 2025. The OTC learned of suspicious activity in December 2025. Affected data includes names and Social Security numbers. The OTC engaged third-party forensic specialists, cooperated with the IRS, and implemented additional safeguards. Credit monitoring is offered.
- Indiana State AGas victim2026-03-27
Oklahoma Tax Commission reported a data breach to the Indiana Attorney General. The breach occurred on 2024-07-05 and was reported on 2026-03-27. 126 Indiana residents were affected.
- Vermont State AGas victim2026-03-27
The Oklahoma Tax Commission (OTC) disclosed a data breach affecting its OkTAP system. Unauthorized access occurred between September 18, 2025, and December 20, 2025, exposing names and Social Security numbers from W-2 and 1099 files. The OTC notified 10 Vermont residents on March 27, 2026, offering 12 months of credit monitoring. The incident is contained, with additional safeguards implemented.
- Massachusetts State AGas victim2026-03-27
The Oklahoma Tax Commission notified Massachusetts residents of an incident involving personal information. Due to Massachusetts law restrictions, the notice does not disclose the nature of the incident, dates, or specific data types beyond general personal information. The Commission offered 24 months of complimentary credit monitoring via Cyberscout. No specific attack vector, dates, or affected counts were disclosed in the letter.