Free tool
Tax ID Format Check (EIN, VAT, SIREN)
Pick the country and the type of number, type it, and the check reports whether it is well formed. It runs the same format rules the rest of the site uses, so it never claims coverage we do not have.
- 5 free checks a day
- No account and no API key
- Checked instantly in your browser
The result appears here. Nothing is stored, and the allowance is per visitor per day.
Example result
A nine-digit US number with an assigned prefix
- Type
- US EIN or TIN
- Nine digits
- Yes
- Prefix 12 assigned
- Yes
- Verdict
- Well formed
A format example, not a real taxpayer. It shows the shape passing, not that any particular EIN was issued.
A real check above replaces this example.
What the check reads
- The country and type
- You choose which rule runs, so a US number is never checked against a Swedish rule. The set is fixed to the countries we already validate.
- United States, EIN or TIN
- Nine digits, with the first two inside the ranges the tax authority assigns. A number with letters, or the wrong number of digits, is rejected.
- European Union, VAT number
- A two-letter country prefix followed by 2 to 13 characters, and the prefix must be one the European VAT register covers. A UK number is named as out of scope.
- Sweden, organisationsnummer
- Ten digits with a Luhn check digit, often written with a hyphen before the last four.
- France, SIREN
- Nine digits with a Luhn check digit. A SIRET adds five digits for one establishment and is not accepted here.
- What is not checked
- Whether the number was ever issued, whether the business still trades, and whether it belongs to the company on your invoice. None of that is a format question.
Where the answer comes from
- US tax authority: valid EIN prefixes
The ranges the EIN option checks the first two digits against.
- the official VAT register
The member states the VAT option covers, plus Northern Ireland as XI.
Worked examples
Example inputs and the results they return.
A nine-digit US number with an assigned prefix
- Type
- US EIN or TIN
- Nine digits
- Yes
- Prefix 12 assigned
- Yes
- Verdict
- Well formed
A format example, not a real taxpayer. It shows the shape passing, not that any particular EIN was issued.
A VAT number the European register covers
- Type
- EU VAT number
- Country prefix
- SE, covered
- Length
- Valid
- Verdict
- Well formed
The prefix decides coverage. Sweden is covered; a UK number is not.
A UK number, out of scope rather than wrong
- Type
- EU VAT number
- Country prefix
- GB, not covered
- Verdict
- Out of scope
The European VAT register no longer covers the United Kingdom. Northern Ireland is still covered, under the XI prefix.
FAQ