Contact your country’s tax authority’s anonymous tip line or online whistleblower portal
Use a secure, anonymous email account created without your real name
Submit only factual information you personally know
Include names, dates, amounts, account details, businesses, and locations if available
Attach copies of documents, messages, receipts, or transaction records if you have them
Avoid sending metadata that could reveal your identity
Use a public network or privacy-focused browser if you choose to submit online
Do not include your own identifying details in the report
Ask the tax authority whether anonymous submissions are accepted
If available, report through a lawyer or authorized representative
Keep a private record of what you reported and when
If there is immediate danger, contact law enforcement instead of waiting