IRS Criminal Investigation (CI) serves the American public by investigating potential criminal violations of the Internal Revenue Code and related financial crimes in a manner that fosters confidence in the tax system and compliance with the law. Report tax fraud Identify tax schemes Report tax fraud Voluntarily disclose What we do About Criminal Investigation What we investigate Investigation process J5: Our international partnership Latest news Dec. 17, 2024 — Leader of large-scale fentanyl trafficking conspiracy sentenced to 22 and a half years in prison Dec. 16, 2024 — Tallahassee area realtor found guilty of willfully failing to file income tax returns Dec. 16, 2024 — Pasadena doctor agrees to plead guilty to conspiring with attorney to bilk more than $3 million from California’s workers’ compensation fund More press releases