How do I validate a VAT number?

Type or paste the VAT number into the validator above. It detects the country code, checks the number against that country's format pattern, and instantly shows whether the format is valid, invalid, or has an unrecognised prefix — all in your browser.

Which countries are supported?

All 27 EU member states plus the United Kingdom. Each country has its own pattern — for example DE123456789 (Germany), FRXX999999999 (France), NL123456789B01 (Netherlands) and GB123456789 (UK). Note that Greece uses the EL prefix.

Does it check if the VAT number is actually registered?

The instant validator checks the format and structure (the most common source of errors). Live registration lookup against the EU VIES database is part of the full invoice validation workflow and our roadmap — but format validation alone catches the majority of supplier data-entry mistakes.

Why does the country prefix matter?

A VAT number without its 2-letter country prefix (e.g. 123456789 instead of DE123456789) is incomplete and will fail validation in most systems. The prefix tells you and the tax authority which jurisdiction issued the number.

Can it catch formatting mistakes?

Yes. Spaces, dots, dashes and transcription errors are normalised, and the cleaned number is checked against the country pattern. Numbers that are too short, too long or contain invalid characters are flagged.

Yes. The VAT number validator is free to use, with no signup required. Validation runs entirely in your browser.

Can I validate VAT numbers in bulk?

For one-off checks, use the validator above. To validate VAT numbers across many invoices at once — alongside the calculations and totals — upload documents to the Invoice VAT Checker.

Is my data sent anywhere?

No. Format validation runs locally in your browser, so the VAT numbers you type are not transmitted to any server.

How is this different from checking VAT on an invoice?

This tool validates a single VAT registration number's format. The Invoice VAT Checker and AI VAT Auditor go further — they validate the VAT number in the context of a whole invoice, including calculations, rates and totals.

Free VAT Number Validator

VAT Number ValidatorVerify VAT registration numbers instantly

Validate VAT numbers before processing invoices, approving suppliers or submitting tax records. Avoid costly compliance mistakes with instant VAT verification.

What the validator checks

VAT number format

Registration structure

Country prefix

EU VAT compliance

Invoice consistency

Supplier verification

Tax compliance risks

27 EU states + UK

Free · No signup · Runs in your browser · EU & UK formats

Validate a VAT number

Enter a VAT number to instantly check its format and country. Validation runs in your browser — nothing is sent anywhere.

Try:

Checks structure & country format for all 27 EU states + the UK. For full validation against an invoice's calculations and totals, use the Invoice VAT Checker.

VAT Number Validator — AI verification dashboard checking a business VAT registration number

What is a VAT number validator?

A VAT number validator is a tool that verifies whether a VAT registration number is properly formatted, belongs to the correct jurisdiction and appears valid for business transactions. Businesses across Europe and many other regions rely on VAT numbers for invoicing, tax reporting, supplier verification, cross-border transactions and compliance checks.

Using an invalid VAT number can create significant accounting and tax problems — from rejected invoices to failed input-tax reclaim. A VAT validator helps reduce these risks before invoices ever enter your accounting system, turning a manual lookup into an instant, automatic check. It pairs naturally with VAT extraction, which pulls the VAT number off the invoice in the first place.

Finance professional verifying a supplier VAT registration number using an AI compliance dashboard

Why VAT number validation matters

Many companies assume supplier information is always correct. Unfortunately, errors happen frequently — missing VAT numbers, incorrect prefixes, formatting mistakes, outdated registrations and plain data-entry slips. When these go unnoticed, the consequences land later and cost more.

Common issues

Missing VAT numbers
Incorrect prefixes
Formatting mistakes
Outdated registrations
Supplier data-entry errors

What it can lead to

Rejected invoices
Tax reporting problems
Compliance risks
Audit complications
Delayed payments

Validating VAT numbers before processing invoices significantly reduces these risks — and when it's instant and free, there's no reason to skip it.

AI compliance engine detecting invalid VAT numbers and tax risks inside supplier invoices

How VAT number validation works

The process is straightforward — and instant.

Enter a VAT number

Type or paste the registration number.

Country code identified

The 2-letter prefix is detected.

Format rules checked

Validated against that country's pattern.

Structure verified

Length and character rules confirmed.

Compliance checks

Prefix and structure assessed for risk.

Result generated

Valid, formatting issue, or invalid.

Valid VAT number Potential formatting issue Invalid VAT number

Step-by-step VAT number validation workflow — country code, registration format and compliance status

Common VAT number errors

Missing country prefix

Numbers submitted without the required country identifier — e.g. 123456789 instead of DE123456789.

Incorrect length

Each country uses a specific VAT-number length. Adding or dropping a digit invalidates the registration.

Formatting mistakes

Stray spaces, dots, dashes and transcription errors are common and break automated checks.

Supplier data errors

Businesses occasionally provide outdated or incorrect registration information on their invoices.

Missing prefix example

123456789 DE123456789

VAT number validation dashboard highlighting formatting errors, missing prefixes and invalid structures

EU VAT validation

Cross-border business transactions often require additional verification. EU VAT validation helps businesses verify trading partners, reduce tax risks, improve invoice compliance and support accurate VAT reporting. Because each member state uses its own number structure, a validator that understands all of them is essential for anyone trading across the EU and UK.

The VAT Number Validator is especially valuable for:

Ecommerce businessesAgenciesAccounting firmsImport/export companiesMultinational organizations

European VAT compliance dashboard validating business VAT numbers across multiple EU countries

Validate VAT numbers in seconds

Avoid compliance issues before they impact your accounting workflows.

Who uses VAT number validation software?

Accountants

Verify client and supplier information before posting.

Bookkeepers

Reduce manual compliance checks on every invoice.

Ecommerce businesses

Validate supplier and marketplace VAT registrations.

Agencies

Manage VAT verification across multiple clients.

Finance teams

Improve audit readiness and compliance.

Accounts payable teams

Verify invoices before they're approved for payment.

Accountants and finance teams using VAT validation software to verify supplier registrations

VAT Number Validator vs manual verification

Feature	Manual verification	VAT Number Validator
Speed	Slow	Instant
Accuracy	Human-dependent	Automated
Scalability	Limited	Unlimited
Compliance checks	Manual	Automatic
Supplier validation	Time-consuming	Immediate
Audit readiness	Moderate	Improved

Manual VAT number verification versus AI-powered VAT validation platform

Frequently asked questions

Everything you need to know about validating VAT numbers.

The complete guide to validating VAT numbers

A VAT registration number is the single most important compliance field on a business invoice, yet it is also one of the most frequently mistyped. A transposed digit, a dropped country prefix or a stray space can turn a valid registration into one that fails automated checks — and the consequences (rejected invoices, blocked input-tax reclaim, audit findings) surface long after the invoice was approved. Validating the number up front, the moment it enters your workflow, is the cheapest insurance there is.

How VAT number formats differ by country

Every EU member state defines its own VAT-number structure, and the UK has its own as well. German numbers are DE followed by nine digits; French numbers are FR plus two characters and nine digits; Dutch numbers end in a B and two digits; UK numbers are GB followed by nine (or twelve) digits; and Greece, unusually, uses the EL prefix rather than GR. A validator has to know all of these patterns to give a correct answer — checking length, allowed characters and the country-specific structure, not just whether the string "looks like" a VAT number.

Format validation vs registration lookup

There are two levels of VAT verification. The first is format validation: does the number match its country's structural pattern? This catches the overwhelming majority of real-world errors, because most bad VAT numbers are simply mistyped or incomplete. The second level is registration lookup — confirming, via the EU's VIES service, that the number is actually registered and active. The instant validator on this page performs format validation locally in your browser; full registration lookup is part of the broader invoice validation workflow. For day-to-day supplier checks, format validation is fast, private and resolves most problems.

From a single number to a whole invoice

Validating one VAT number is useful; validating it in the context of an invoice is transformative. The Invoice VAT Checker and the AI VAT Auditor take the VAT number alongside the subtotal, rate, VAT amount and total, and confirm that everything reconciles — so a valid number on an invoice with broken maths is still caught. Upload an invoice to the checker, or extract VAT data at scale with the invoice parser, and every VAT number is validated automatically as part of the audit.

Related tools & features

Invoice VAT Checker

Validate a whole invoice's VAT

EU VAT Invoice Validation

Cross-border EU compliance

AI VAT Auditor

How the validation engine works

Invoice Parser

Extract data from any invoice

Verify VAT numbers before they cost you

Check VAT registration numbers instantly, or upload a full invoice for complete VAT validation.

No credit cardGDPR compliantEU & UK VATValidation in-browser