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Slovenia VAT Number Format (SI12345678)

Davek na dodano vrednost (DDV) number structure, regex & verified examples

Everything you need to know about Davek na dodano vrednost (DDV) numbers in Slovenia — they follow the pattern SI + 8 digits (e.g. SI12345678), and can be verified against VIES. For the rates themselves, see Slovenia VAT rates and their history. Building a check into your app? See the Slovenia VAT API.

EU Member StateDDV — Davek na dodano vrednostEUR

VAT Number Format

Structure

SI + 8 digits

Example format

SI12345678

Regex

^SI\d{8}$

VAT numbers are not case-sensitive — lowercase input is automatically normalised.

More on Slovenia

What we return for Slovenia

  • VIES validation (valid / not valid)
  • Company name & address
  • National registry ID
  • Founded date
  • Legal form
  • Industry
  • Works if VIES is down

See the full coverage table for all 27 EU member states + Northern Ireland →

Famous Slovenia VAT Numbers

Krka d.d., Novo Mesto

SI82646716

Slovenian pharmaceutical company

Verify →

NLB d.d.

SI91132550

Slovenia's largest bank

Verify →

Telekom Slovenije d.d.

SI98511734

Slovenian incumbent telecom operator

Verify →

Mercator d.o.o.

SI45884595

Slovenian food retail chain

Verify →

Petrol d.d.

SI80267432

Slovenian energy and fuel retail company

Verify →

Zavarovalnica Triglav d.d.

SI80040306

Slovenia's largest insurance group, listed on LJSE

Verify →

Check a Slovenia VAT Number

Enter a DDV number starting with SI to verify it against the official VIES database.

Format: SI + 8 digits

Example:

Validate a Slovenia SI VAT number via API

Get Slovenia VAT rates via API — free, no key

No API key required
Request
curl "https://api.vatnode.dev/v1/rates/SI"
Response200 OK
{
  "countryCode": "SI",
  "countryName": "Slovenia",
  "vatName": "Davek na dodano vrednost",
  "vatAbbr": "DDV",
  "standardRate": 22,
  "reducedRates": [
    9.5,
    5
  ],
  "superReducedRate": null,
  "parkingRate": null,
  "vatNumberFormat": "SI + 8 digits",
  "vatNumberPattern": "^SI\\d{8}$",
  "updatedAt": "2026-08-13"
}

View full rates API reference →

Get Slovenia VAT rates via package — offline, no HTTP

eu-vat-rates-data
Request
# npm install eu-vat-rates-data
import { getRate } from 'eu-vat-rates-data'

const rate = getRate('SI')
console.log(rate.standard) // SI standard VAT rate
getRate() result200 OK
{
  "country": "Slovenia",
  "currency": "EUR",
  "eu_member": true,
  "vat_name": "Davek na dodano vrednost",
  "vat_abbr": "DDV",
  "standard": 22,
  "reduced": [
    5,
    9.5
  ],
  "super_reduced": null,
  "parking": null,
  "format": "SI + 8 digits",
  "pattern": "^SI\\d{8}$"
}

View package on GitHub →

Validate Slovenia SI VAT numbers

Requires API key
Request
curl "https://api.vatnode.dev/v1/vat/SI82646716" \
  -H "Authorization: Bearer YOUR_API_KEY"
Response200 OK
{
  "valid": true,
  "vatId": "SI82646716",
  "countryCode": "SI",
  "companyName": "Krka d.d., Novo Mesto",
  "companyAddress": null,
  "companyRegistrationDate": null,
  "companyForm": null,
  "industryDescription": null,
  "registryCode": null,
  "registryCodeName": null,
  "verifiedAt": "2026-04-25T12:00:00.000Z",
  "checkId": "019dc41e-d64d-7255-8ed7-cf5443103cd8",
  "countryName": "Slovenia",
  "countryVat": {
    "vatName": "Davek na dodano vrednost",
    "vatAbbr": "DDV",
    "currency": "EUR",
    "standardRate": 22,
    "reducedRates": [
      9.5,
      5
    ],
    "superReducedRate": null,
    "parkingRate": null,
    "vatNumberFormat": "SI + 8 digits",
    "vatNumberPattern": "^SI\\d{8}$",
    "countryVatUpdatedAt": "2026-08-13"
  },
  "consultationNumber": null
}

View full API response schema →

Frequently Asked Questions

What is the VAT number format in Slovenia?▾

VAT numbers in Slovenia follow the format: SI + 8 digits. Example: SI12345678. VAT numbers are not case-sensitive — lowercase input is automatically normalised.

What is the VAT number regex pattern in Slovenia?▾

Use this regular expression to validate VAT numbers in Slovenia DDV number format locally:

^SI\d{8}$

Test against the uppercase number. Format validation catches typos locally — always follow with a VIES check to confirm the number is active.

How do I validate a VAT number in Slovenia programmatically?▾

Send a GET request to https://api.vatnode.dev/v1/vat/{vatId} with your Authorization: Bearer header. The API checks the number against the official EU VIES database and returns a JSON response with a valid field, company name, address, and current DDV rates. Free plan available — 100 requests/month, no credit card required.

What does DDV stand for in Slovenia?▾

DDV stands for Davek na dodano vrednost — the Slovenian name for Value Added Tax (VAT). It appears on Slovenian invoices and tax documents.

VAT Number Formats for Other EU Countries

Validate Slovenia VAT numbers in your app

Use the vatnode API to automate DDV validation in your invoicing or checkout flow. Free plan available, no credit card required.

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