Gather relevant evidence such as documents, dates, names, amounts, and account details
Identify the correct tax authority for your country or region
Use the tax authority’s official fraud or whistleblower reporting form if available
Submit the report through the authority’s secure online portal, phone line, mail, or email if permitted
Provide clear, factual information about the suspected tax evasion
Include your contact information only if you want to be reached for follow-up
Keep copies of everything you submit
Do not alter, destroy, or conceal evidence
Consider consulting a lawyer or tax professional if the situation is complex or you fear retaliation
Report immediately if the evasion involves ongoing criminal activity or large sums
Follow any confidentiality or whistleblower protection procedures offered by the authority