Slovenia VAT number: format and validation

By Remco from Avatcado

Format

SI followed by 8 digits. The local term is identifikacijska stevilka za DDV (davek na dodano vrednost) (ID za DDV, Slovene).

Pattern: /^\d{8}$/

  • The VAT ID is simply the company's 8-digit davcna stevilka (tax number) with an SI prefix; every taxpayer has a tax number, but only VAT-registered ones may use it with SI
  • The first 7 digits are randomly assigned; the 8th is a control digit

Example of a registered number: SI82646716

Check digit

Slovenia VAT numbers carry a check digit (MOD 11): The 8th digit is a check digit computed modulo 11 over the first 7 digits of the tax number.

Check a Slovenia VAT number

Validated live against the FURS (Financial Administration of the Republic of Slovenia) (official register).

Enter a VAT number to see the live API response

Validate via API

The same validation as an API call, with the example number above:

curl "https://api.avatcado.com/v1/validate?vat_number=SI82646716" \
  -H "Authorization: Bearer avat_live_your_api_key"
import Avatcado from "@avatcado/node";

const avatcado = new Avatcado("avat_live_your_api_key");
const { data, error } = await avatcado.vat.validate({
  vatNumber: "SI82646716",
});

if (data?.data.valid) {
  console.log(`Registered: ${data.data.company?.name}`);
}

Free tier includes 500 validations per month. Get an API key or read the API documentation.

Frequently asked questions

Is a Slovenian tax number the same as a VAT number?

Almost: the ID za DDV is the same 8 digits as the davcna stevilka, prefixed with SI. Holding a tax number does not imply VAT registration, so the SI-prefixed form only validates in VIES once FURS has registered the business for DDV.

What is the Slovenian VAT registration threshold?

EUR 60,000 of annual taxable turnover, raised from EUR 50,000 on 1 January 2025. Below it, registration is optional.

Related guides

VAT rate in Slovenia

The standard VAT rate in Slovenia is 22%. Reduced rates: 9.5%, 5%. See all Slovenia VAT rates.

Sources