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Official tax references

Authority pages selected for country-specific tax research. Source checks were attempted on . This register records evidence and gaps, not certified tax coverage.

No official rate presets are approved. Reading an official page is separate from validating its current legal applicability. Some official documents remain online after being superseded; some references could not be fully retrieved.

Country coverage

Important research findings

Saudi and South African official sites contain discoverable older guidance that must not be mistaken for current rules. Brazil has official reform documentation, but an old index URL moved. Canadian coverage requires provincial validation. US references here cover only California and Texas, not all states.

Review standard

Before publication, rules require document-level citations, effective dates, scope, exclusions, independent fixtures and recorded human approval. A source we have not verified is not the same as a rule the government has not determined. Changes require a new reviewed version; they must never silently overwrite historical rules.