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 March 27, 2024 — Columbus man faces 20 to 23 years in prison as part of narcotics guilty plea involving killing of another Columbus resident March 27, 2024 — Filing fraudulent tax return results in prison for tax preparer March 27, 2024 — KC tax preparer pleads guilty to wire fraud, false tax returns More press releases