Identifikacijska številka za DDV

Slovenia VAT number format

Slovenia VAT numbers (ID za DDV) are written as SI + 8 digits, for example SI50223054.

Country code: SI
Format: SI + 8 digits
Example: SI50223054
Local name: Identifikacijska številka za DDV
Register: VIES (EU)
Standard VAT rate: 22%

Regular expression

^SI\d{8}$

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

Check a Slovenia VAT number

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

How Slovenia VAT numbers are built

SI followed by 8 digits, the tax number (davčna številka).

Check digit

The 8th digit is a weighted modulo-11 check digit (weights 8 to 2). The validator checks it.

Common mistakes

The tax number and the VAT number have the same digits; only VAT-registered businesses are valid 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 Financial Administration (FURS), and VIES asks that register for you. Where Slovenia shares them, VIES also returns the registered name and address.

Check a Slovenia number with the validator above, in the VAT number checker, or up to 50 at once with the bulk VAT validator.

Check Slovenia VAT numbers by API

curl "https://api.vatcheckapi.com/v2/check?vat_number=SI50223054" -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 Slovenia provides them.

Frequently asked questions

What does a Slovenia VAT number look like?

SI followed by 8 digits, the tax number (davčna številka). The local name is Identifikacijska številka za DDV (ID za DDV), for example SI50223054.

How do I check a Slovenia 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 Slovenia VAT numbers have a check digit?

The 8th digit is a weighted modulo-11 check digit (weights 8 to 2). The validator checks it.

What is the most common mistake with Slovenia VAT numbers?

The tax number and the VAT number have the same digits; only VAT-registered businesses are valid in VIES.

What is the VAT rate in Slovenia?

The standard rate is 22%. See VAT rates in Slovenia 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": []
}

Free VAT, EORI and IBAN tools

VAT checker: check a VAT number Is this VAT number valid and active? Bulk VAT validator Check a list of VAT numbers at once. UK VAT checker Is this UK VAT number registered? VAT calculator Add or remove VAT at any EU rate. EORI checker: check an EORI number Is this EORI number valid and registered? E-invoice validator Upload an XRechnung, ZUGFeRD or EN 16931 invoice and validate it IBAN checker Is this IBAN well formed, and which bank is it? VAT number formatsAll 29 EU and UK formats with examples. VAT ratesStandard and reduced rates by country.