Last reviewed: June 1, 2026 · Written by James Carter, Consumer Rights Researcher · Independent resource — not a government site
Quick answer
Report tax evasion to the IRS using Form 3949-A at irs.gov or call 1-800-829-0433. For large fraud over $2 million use the IRS Whistleblower Program — you can earn 15-30% of what the IRS collects. All reports can be anonymous.