# EU VAT Validator Validate European Union Value Added Tax (VAT) numbers from all EU member states > Canonical page: https://elysiatools.com/en/tools/eu-vat-validator - **Category:** Validation - **Keywords:** vat, tax, eu, europe, union, vat number, validator, business, b2b, moss, oss ## Overview The EU VAT Validator is a free online tool that checks the format and validity of Value Added Tax (VAT) numbers from all European Union member states. It helps businesses verify tax identifiers quickly and accurately for compliance and transactional purposes. ## Inputs - **VAT Number** (text): Enter EU VAT Number (e.g., DE123456789, FR12345678901)... - **Country** (select): Auto-detect or select country ## When to use - When issuing invoices to clients in EU countries to ensure the VAT number format is correct. - During supplier or customer onboarding to verify the legitimacy of provided VAT numbers. - For compliance checks in cross-border trade within the European Union to avoid tax errors. ## How it works - Enter the VAT number into the input field, such as 'DE123456789' for Germany. - Optionally, select the country from the dropdown or rely on auto-detection based on the number prefix. - The tool validates the number against the standard format for the specified or detected country. - Receive an instant text result indicating whether the VAT number is valid or invalid. ## Use cases - Verifying customer VAT numbers for B2B invoicing in e-commerce platforms. - Checking supplier VAT numbers during procurement to ensure tax compliance. - Validating VAT numbers for accurate tax reporting in cross-border sales within the EU. ## Frequently asked questions ### What is a VAT number? A VAT number is a unique identifier assigned to businesses registered for Value Added Tax in the EU. ### How does auto-detection work? The tool uses the prefix of the VAT number to automatically determine the country code. ### Is this tool free to use? Yes, the EU VAT Validator is completely free for validating VAT numbers. ### What countries are supported? All 27 EU member states are supported, including Germany, France, Italy, and Spain. ### Can I validate multiple VAT numbers at once? 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