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SCOPE

In Scope

VAT number validation semantics
Evidence chain requirements
Failure mode taxonomy
Claim structure definition
Audit log format specification

Out of Scope

Runtime infrastructure
API design
SDK implementation details
Billing and payments
Customer relationships
Marketing and positioning

Jurisdiction Boundaries

VATFIX defines rules for jurisdictions where rules are codified.

Currently in scope:

EU VAT (via vatfix-rules-eu)

Potentially in scope (future):

UK VAT
Swiss VAT

Out of scope permanently:

Jurisdictions without deterministic validation
Advisory-only regimes
Territories without public registries

External Authority Boundaries

VATFIX does not replace external authorities.

When VIES is down, VATFIX does not invent results. When a registry is unavailable, VATFIX reports unavailability.

Adapters may implement caching and fallback, but:

Provenance must be declared
Cache age must be disclosed
Fallback behavior must be documented

Commercial Boundaries

Commercial implementations:

May use VATFIX rules
May not modify VATFIX rules
May not claim authority over VATFIX

VATFIX does not endorse implementations. VATFIX does not receive revenue from implementations.