vatnode

Slovenia VAT API — Validate Slovenia VAT Numbers in Real Time

REST JSON endpoint for verifying Davek na dodano vrednost (DDV) numbers against the official EU VIES register, with national registry fallback where available and a VIES consultation number once you set your own VAT as requester in dashboard Settings.

Get a free API key Slovenia VAT number format

Why a Slovenia-Aware VAT API

In Slovenia, VAT is known as Davek na dodano vrednost (DDV) and the current standard rate is 22%. Every Slovenia VAT number starts with the prefix SI and follows a fixed structure issued by the Slovenian tax authority. A generic VAT validator that ignores country-specific quirks will accept malformed input, miss the country's format rules, and fail to surface the local registry identifier that accountants and auditors actually need.

The vatnode API normalises DDV input, runs the official VIES check, falls back to the Slovenian national company registry when VIES is unavailable, and returns a single JSON shape with the consultation number, company data where published, and the current Slovenia VAT rates inline.

Slovenia VAT Number Format

Structure
SI + 8 digits
Regex pattern
^SI\d{8}$

Real Slovenia VAT numbers you can validate right now:

Validating Slovenia VAT Numbers — Code Examples

All three examples validate the same Slovenia VAT number SI82646716. To receive a consultation number back, set your own VAT as requester once in dashboard Settings — then every call, including these, returns a consultation number automatically, with no extra parameters.

curl
curl 'https://api.vatnode.dev/v1/vat/SI82646716' \
  -H "Authorization: Bearer YOUR_API_KEY"
Node.js (fetch)
const res = await fetch(
  'https://api.vatnode.dev/v1/vat/SI82646716',
  { headers: { Authorization: `Bearer ${process.env.VATNODE_API_KEY}` } }
)
const data = await res.json()
console.log(data.valid, data.companyName, data.consultationNumber)
Python (httpx)
import os, httpx

r = httpx.get(
    "https://api.vatnode.dev/v1/vat/SI82646716",
    headers={"Authorization": f"Bearer {os.environ['VATNODE_API_KEY']}"},
)
data = r.json()
print(data["valid"], data["companyName"], data["consultationNumber"])

What You Get Back

A successful response for a valid SloveniaVAT number, once you've set your VAT as requester in dashboard Settings, looks like this:

{
  "valid": true,
  "vatId": "SI82646716",
  "countryCode": "SI",
  "countryName": "Slovenia",
  "companyName": "Krka d.d., Novo Mesto",
  "consultationNumber": "WAPIAAAAXk7ZpY3o",
  "source": "VIES",
  "countryVat": {
    "currency": "EUR",
    "standardRate": 22,
    "reducedRates": [5,9.5],
    "superReducedRate": null,
    "parkingRate": null
  },
  "verifiedAt": "2026-05-19T08:14:22Z"
}

When the number is not registered, valid is false and company fields are null. The consultationNumber is the EU VIES requestIdentifier — the documented audit reference for reverse-charge "reasonable care" evidence. It is returned once you set your own VAT as requester in dashboard Settings; otherwise it is null.

Slovenia VAT Rates

vatnode returns the current Slovenian DDV rates inline with every successful response. Today's rates (standard 22%, reduced 5%, 9.5%) are sourced from the European Commission TEDB feed, checked daily and updated on any change.

Rate typeValue
Standard22%
Reduced (1)5%
Reduced (2)9.5%

VIES vs National Fallback for Slovenia

VIES is the primary data source for validation in Slovenia — it is the authoritative EU register and the only source that produces a consultation number. When VIES returns a transient error (timeout, MS_UNAVAILABLE, SERVICE_UNAVAILABLE), vatnode automatically queries the Slovenian national company registry as a fallback so your checkout or invoicing pipeline keeps working.

The response includes a source field that tells you which system answered — VIES for the EU register, or the Slovenian national-registry source code when the fallback ran.

Slovenia is one of the EU countries where vatnode keeps validating during EU VIES outages via a direct national registry adapter. See coverage matrix for the full list.

Slovenia VAT API — FAQ

Is the Slovenia VAT number the same as the company registration number?

No. The Slovenian DDV number is issued by the tax authority for VAT purposes; the national registry identifier is a separate ID issued by the company registry. vatnode returns both fields (registryCode + registryCodeName) for Slovenia when the data is available.

How fast is Slovenia VAT validation through vatnode?

Cached responses return in single-digit milliseconds. Live VIES lookups for Slovenia typically complete in under one second; a 15-minute Redis cache is applied to identical VAT IDs.

Does the API work for Slovenian sole traders and small businesses?

Yes. If a Slovenian sole trader or small business is registered for DDV and listed in VIES, vatnode validates the number and returns the same response shape as for corporate entities. The valid field is true regardless of legal form.

What happens if EU VIES is down for Slovenia?

vatnode falls back to the Slovenian national registry adapter when VIES returns a transient error (timeout, MS_UNAVAILABLE). Validation keeps working from the national source; the response includes a source field so you can tell which system answered.

What is the consultation number returned for checks in Slovenia?

The consultationNumber is the VIES requestIdentifier — a unique reference issued by the EU VIES service that proves the check was performed against the official EU register on a specific date. It is the EU's documented mechanism for "reasonable care" evidence under the reverse-charge rules and is returned once you set your own VAT as requester in dashboard Settings — including for Slovenia.

More on Slovenia

VAT APIs for Other EU Countries

See Also

Building an AI workflow? vatnode is also available to AI agents through the official MCP server — Claude, Cursor and ChatGPT can validate Slovenia VAT numbers and look up rates directly in chat.

Start Validating Slovenia VAT Numbers

100 validations per month on the free plan, no credit card required. REST JSON over HTTPS, VIES consultation number on qualified checks, Slovenian national registry fallback, EU-hosted by default.

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