Umsatzsteuer-Identifikationsnummer (UID-Nummer)

Austria VAT number format

Austria VAT numbers (UID) are written as ATU + 8 digits, for example ATU13585627.

Country code: AT
Format: ATU + 8 digits
Example: ATU13585627
Local name: Umsatzsteuer-Identifikationsnummer (UID-Nummer)
Register: VIES (EU)
Standard VAT rate: 20%

Regular expression

^ATU\d{8}$

Checks the format only. The validator below also checks the check digit.

Check an Austria VAT number

Include the country prefix. EU numbers are checked against VIES in real time, UK numbers with a separate live check.

How Austria VAT numbers are built

ATU followed by 8 digits. The letter U belongs to every Austrian VAT number, and the last digit is a check digit.

Check digit

The 8th digit is calculated from the seven before it (weights 1 and 2, digit sums, modulo 10). The validator checks it.

Common mistakes

Leaving out the U: AT13585627 does not have the Austrian format.
The tax number (Steuernummer) and the company register number (Firmenbuchnummer) are different numbers and are not in VIES.

Is the number registered?

A valid format and check digit only mean the number could exist. Whether it is currently registered for VAT is known to the Austrian tax office (Finanzamt Österreich), and VIES asks that register for you. Where Austria shares them, VIES also returns the registered name and address.

Check an Austria number with the validator above, in the VAT number checker or on the UID-Nummer prüfen (German) page, or up to 50 at once with the bulk VAT validator.

Check Austria VAT numbers by API

curl "https://api.vatcheckapi.com/v2/check?vat_number=ATU13585627" -H "apikey: YOUR-API-KEY"

The response says whether the format and checksum are valid and whether the number is registered, with name and address where Austria provides them.

Frequently asked questions

What does an Austria VAT number look like?

ATU followed by 8 digits. The letter U belongs to every Austrian VAT number, and the last digit is a check digit. The local name is Umsatzsteuer-Identifikationsnummer (UID-Nummer) (UID), for example ATU13585627.

How do I check an Austria VAT number?

Enter it in the validator on this page. It checks the format and check digit and asks the EU's VIES system whether the number is registered, with company name and address where available. The vatcheckapi API does the same from your code.

Do Austria VAT numbers have a check digit?

The 8th digit is calculated from the seven before it (weights 1 and 2, digit sums, modulo 10). The validator checks it.

What is the most common mistake with Austria VAT numbers?

Leaving out the U: AT13585627 does not have the Austrian format.

What is the VAT rate in Austria?

The standard rate is 20%. See VAT rates in Austria for reduced rates and a calculator.

VAT validation API

Validate VAT numbers in your app

vatcheckapi checks the format and checksum of EU and UK VAT numbers and confirms the registration live (VIES for EU numbers), with company name and address where the country provides them.

/v2/check documentation VAT number API All documentation

150 free validations every month. No credit card required.

GET https://api.vatcheckapi.com/v2/check?vat_number=LU26375245

{
  "country_code": "LU",
  "vat_number": "26375245",
  "format_valid": true,
  "checksum_valid": true,
  "registration_info": {
    "is_registered": true,
    "name": "AMAZON EUROPE CORE S.A R.L.",
    "address": "38, AVENUE JOHN F. KENNEDY\nL-1855  LUXEMBOURG",
    "address_parts": null,
    "checked_at": "2026-10-16T09:12:44.000000Z"
  },
  "registration_info_history": []
}

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