Czech Republic VAT API — Validate Czech Republic VAT Numbers in Real Time

Why a Czech Republic-Aware VAT API

In the Czech Republic, VAT is known as Daň z přidané hodnoty (DPH) and the current standard rate is 21%. Every Czech Republic VAT number starts with the prefix CZ and follows a fixed structure issued by the Czech 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 DPH input, runs the official VIES check, falls back to the Czech national company registry when VIES is unavailable, and returns a single JSON shape with the consultation number, company data where published, and the current Czech Republic VAT rates inline.

Czech Republic VAT Number Format

Real Czech Republic VAT numbers you can validate right now:

• CZ45274649 — ČEZ a.s.
• CZ00177041 — Škoda Auto a.s.
• CZ60193336 — O2 Czech Republic a.s.

Validating Czech Republic VAT Numbers — Code Examples

All three examples validate the same Czech Republic VAT number CZ45274649. 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 'https://api.vatnode.dev/v1/vat/CZ45274649' \
  -H "Authorization: Bearer YOUR_API_KEY"

const res = await fetch(
  'https://api.vatnode.dev/v1/vat/CZ45274649',
  { headers: { Authorization: `Bearer ${process.env.VATNODE_API_KEY}` } }
)
const data = await res.json()
console.log(data.valid, data.companyName, data.consultationNumber)

import os, httpx

r = httpx.get(
    "https://api.vatnode.dev/v1/vat/CZ45274649",
    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 Czech RepublicVAT number, once you've set your VAT as requester in dashboard Settings, looks like this:

{
  "valid": true,
  "vatId": "CZ45274649",
  "countryCode": "CZ",
  "countryName": "Czech Republic",
  "companyName": "ČEZ a.s.",
  "consultationNumber": "WAPIAAAAXk7ZpY3o",
  "source": "VIES",
  "countryVat": {
    "currency": "CZK",
    "standardRate": 21,
    "reducedRates": [12],
    "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.

Czech Republic VAT Rates

vatnode returns the current Czech DPH rates inline with every successful response. Today's rates (standard 21%, reduced 12%) are sourced from the European Commission TEDB feed, checked daily and updated on any change.

VIES vs National Fallback for the Czech Republic

VIES is the primary data source for validation in the Czech Republic — 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 Czech 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 Czech national-registry source code when the fallback ran.

Czech Republic VAT API — FAQ

VAT APIs for Other EU Countries

• Denmark VAT API — validate moms numbers
• Estonia VAT number validation API
• Finland VAT API — validate ALV numbers
• Germany VAT number validation API

See Also

• vatnode Quickstart — API key in 60 seconds
• VAT validation reference — endpoint, parameters, error codes
• Czech Republic VAT number format, rates, and verified examples
• Validate Czech Republic VAT numbers from AI agents (Claude, Cursor) via MCP

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