Our methodology

The source comes first.

Tourist tax rules are local. Their provenance, scope and limits should stay visible all the way into your application.

01 / Collect the authority's publication.

Data collection preserves original public source references, retrieval dates and hashes of retained evidence. Source material can be an official regulation, an authority rate table or a municipal publication.

02 / Preserve the hierarchy and the conditions.

Country, regional, provincial, municipal and special-district taxes can overlap. A rate is kept with its dates, currency, tax base, category, exemptions, seasons and night caps. Unsupported conditions remain available for manual review.

03 / Publish an explicit scope.

A few verified cities never establish nationwide completeness. Coverage reports distinguish partial, unknown, stale, manual review and verified no-tax evidence. Failed collection or validation must preserve the last good published snapshot.

04 / Resolve only what the evidence supports.

Address text and postal codes do not prove a jurisdiction. Supported defaults require authoritative location identifiers, sufficient coverage and supported rule inputs. Uncertainty is returned as a first-class state.