Editorial and source policy

How tools are reviewed, limited in scope, and updated when Thai rules change.

Source hierarchy

We prioritize legislation and Royal Gazette publications, documents from the responsible authority, and official technical standards. A secondary source is disclosed with its limitation and is not presented as final evidence for a high-impact tool.

Effective dates and review

Time-sensitive rates and thresholds are separated from interface code and record their effective period, review date, and direct source URL. High-impact tools are reviewed at least quarterly and whenever a new announcement is identified.

Status labels

Reviewed means the displayed source, core formula, and principal tests were checked on the stated date. Limited scope means the tool is safe only for the cases explicitly described and requires confirmation with the primary authority. Beta means a source, example, translation, or supported case remains incomplete. No label is government certification.

Corrections

A rule change updates the data, specification, explanation, and tests together. Material changes are recorded in the changelog. Reports should never include real identity numbers, income, documents, or other personal information.

Last updated 26 August 2026