VAT validation coverage.Country by country.

VIESAC has developed an intelligent verification system combining SmartRouter™, SmartCache™ and VIESAC AI. SmartRouter™ coordinates official checks, national fallbacks and background retries according to the country, service availability and verification rules. SmartCache™ reuses eligible recent results to avoid repeated requests and reduce registry load. Together, these technologies are designed to deliver a fast, well-supported answer. When VIES or an official source stalls, the system preserves available evidence with its origin and timestamps, distinguishes provisional findings from official confirmation, and queues eligible audits for rechecking. The audit trail shows what supported the result and when it was obtained.

Plans that include advanced enrichment add VIESAC AI agents to research missing company details, such as a legal name or registered address. Our own research workflows combine large language models (LLMs), purpose-built prompts, internal verification history and information retrieved from official and public sources. Identifier matching and source checks help assess whether a finding belongs to the company being checked. Available provenance is recorded in the audit trail, keeping enriched information distinguishable from the original registry response. This supports a more complete, evidence-based result where sources allow; AI enrichment does not independently establish current VAT registration, and unresolved details may remain unavailable.

Shared verification and evidence checks complement country-specific coverage, helping maintain continuity when a primary check cannot be completed. The layers used depend on the country, identifier and outcome. Available evidence is reflected in the API result and audit record.

No. National coverage describes an additional verification path. It does not guarantee VIES availability or an identical result from every source. The scope of each check is reflected in its result and audit evidence.

Additional national checks support selected identifiers, cases or evidence. They provide narrower coverage than the full national fallback category and do not replace every VIES check.

No. A number can have the right structure and check digit without being currently registered for VAT. Registration must be checked separately.

Yes. Supported VAT and GST validation countries are available through the VIESAC API used by audits and integrations. Rate-only countries support rate lookup, not VAT number validation or audit creation.

The indicators use periodically saved service-status snapshots. The page shows the check time and stops showing an available status when the snapshot becomes too old. A service can still be slow or reject a particular request between status checks.