VAT Number Validator

This tool performs UK VAT number validation by accepting a VAT ID, normalizing input, and applying format and basic validity rules to determine plausibility. It is designed for finance teams, developers integrating VAT checks, and compliance professionals.
Core logic includes removing spaces, optional GB prefix, validating digit-only patterns, and applying simple consistency checks. Optional live status checks can be performed when external validators are available, returning 'valid', 'invalid', or 'unknown' statuses and suggested corrections.
Users benefit from quick input validation to prevent errors in invoicing, ERP data, and customer onboarding. The tool supports batch workflows via API input, returns structured outputs for integration, and minimizes data-entry mistakes.
Differentiators include robust handling of common formatting variations, clear edge-case handling for incomplete IDs, and conservative error reporting that avoids false positives. Use cases span accountants validating supplier VAT numbers, e-commerce onboarding, and B2B tax compliance.