Report Tax Evasion in Thailand Anonymously: The Channels

TL;DR

Suspected tax evasion is reported to the Revenue Department (กรมสรรพากร). Channels include the 1689 hotline, the e-form on rd.go.th, and the Inspector-General's Office. Revenue Code §123/4 provides an informant reward of up to 15% of the tax actually recovered, capped per the Notification. Reports can be anonymous, but rewards require identification. Confidentiality of informants is statutorily protected.

Reporting Channels

• Hotline 1689 (Revenue Department).
• E-form via rd.go.th → "แจ้งเบาะแสภาษี" (tax tip-off).
• Written letter to the Inspector-General, Revenue Department.
• In-person at any Area Revenue Office.
• Anti-Corruption sister channels for officer-corruption-flavoured cases (NACC).

What to Include

• Identification of the taxpayer (name, address, tax-ID where known).
• Description of the suspected evasion (under-reporting, non-declaration, fictitious invoices).
• Supporting documents or references (invoices, bank statements).
• Time period at issue.

The Reward System

Protections + Risks

• Statutory confidentiality (Revenue Code §10).
• Civil-defamation risk if the report is malicious and false — Criminal Code §326-328.
• If reporter is the taxpayer's employee, employment-law retaliation protections under the Labour Protection Act may also apply.

Common Mistakes

• Reporting without any documentary basis — likely to be discounted.
• Identifying the reporter to the taxpayer informally — destroys protection.
• Expecting fast resolution — audits commonly take 12+ months.

FAQs

1. Is the reward reliable?

Reward is paid by the Revenue Department per published rules; the cap and discretion under §123/4 apply.

2. Can foreigners report?

Yes — no nationality restriction on reporters.

Related Reading

• Whistleblower Protections
• Tax Law Hub