AP Teams and Tax Compliance
How do organizations validate supplier and customer VAT numbers at scale?
VAT number validation involves checking that a VAT registration number exists in the relevant tax authority database, is active, and belongs to the named entity. For EU VAT numbers, the VIES (VAT Information Exchange System) provides real-time lookup. For non-EU jurisdictions, country-specific APIs or third-party validation services are used. Automated validation at invoice ingestion prevents input VAT reclaim denials.
How do organizations integrate VIES for EU VAT number validation?
VIES (VAT Information Exchange System) is the European Commission's EU VAT number lookup service:
- API access: VIES provides a SOAP/REST API at ec.europa.eu/taxation_customs/vies/
- Validation: Returns whether the VAT number is valid, the registered business name, and address where available
- Rate limiting: VIES has usage limits; high-volume users should cache results and implement retry logic
- Response retention: Save the validation timestamp and result to prove due diligence if the number later becomes invalid
- Coverage: Validates EU member state VAT numbers; UK VAT numbers validated via HMRC API post-Brexit
Frequently Asked Questions
- What happens if a supplier's VAT number is invalid at the time of invoice?
- If a supplier's VAT number is invalid when the invoice is issued, the buyer may be denied input VAT deduction on that invoice. The buyer should notify the supplier immediately and request a corrected invoice with a valid VAT number. If the supplier's VAT registration has lapsed, this may indicate a broader compliance issue. Documenting the validation check at the time of invoice processing provides some protection.
- How often should organizations re-validate supplier VAT numbers?
- Best practice is to validate VAT numbers on every invoice rather than relying on a periodic check of master data. VIES validation adds minimal latency to invoice processing. At minimum, organizations should validate VAT numbers when a new supplier is onboarded and when an invoice is received from that supplier for the first time in each calendar year. Monthly batch validation of active supplier VAT numbers catches registrations that have lapsed.