English interface
Thai tax ID format checker
Check the structure and check digit of a 13-digit Thai tax ID.
ReviewedCheck before reuse
Saves this tool's name on this device only (up to 20). No form values.
Only visible result text is included. Form fields are not read. Review sensitive values before sharing.
How to use it
- Read the scope and effective-date note before entering information.
- Enter the requested values and review any validation message.
- Check the result, assumptions and cited source before relying on it.
Important limitation
A valid check digit does not confirm registration or identity with the Revenue Department.
The interactive form is fully localized in English.
Reviewed 2026-08-26; next review 2027-02-26.
Core calculations, cited sources and main examples have been reviewed within the stated scope.
Sources
การใช้เลขประจำตัวผู้เสียภาษีอากร 13 หลักกรมสรรพากร · opens in a new tabSupports the method and scope stated on the tool page; consult the source for case-specific rules.Source checked 2026-08-26บริการตรวจสอบเลขประจำตัวผู้เสียภาษีกรมสรรพากร · opens in a new tabSupports the method and scope stated on the tool page; consult the source for case-specific rules.Source checked 2026-08-26Recorded updates
Site changelogReview history
Dates describe the review scope recorded below. A page update does not mean every source was checked again.
- Last recorded source/method review
Core calculations, cited sources and main examples have been reviewed within the stated scope.