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Validate Czech Republic VAT Numbers via API
When building B2B applications that serve Czech Republic (Česká republika), validating your customers' DIČ (Daňové identifikační číslo) is essential for EU VAT compliance and protecting your business from tax liability.
The TaxID API provides instant validation of Czech Republic VAT numbers through the EU VIES (VAT Information Exchange System). Every request returns the registration status, company name, and registered address — with sub-100ms response times for cached results.Czech Republic applies a standard VAT rate of 21% (DIČ) and is fully supported by the VIES system.
QUICK START
curl -H "Authorization: Bearer YOUR_API_KEY" \ http://localhost:3000/api/v1/validate/CZ/CZ12345678
Code examples
Choose your language. Every example validates a Czech Republic VAT number and returns the registration status with company details.
const res = await fetch('http://localhost:3000/api/v1/validate/CZ/CZ12345678', {
headers: { 'Authorization': 'Bearer YOUR_API_KEY' }
});
const data = await res.json();
// { valid: true, status: "active", company_name: "...", country_code: "CZ", cached: false }
console.log(data);When to validate Czech Republic VAT numbers
B2B cross-border sales
When selling goods or services to Czech Republic businesses in other EU member states, you must verify their DIČ (Daňové identifikační číslo) to correctly apply zero-rate VAT under the reverse charge mechanism. Failing to validate before zero-rating a transaction makes your company liable for the full VAT amount if the customer turns out to be unregistered.
E-commerce and SaaS checkout
If your platform accepts Czech Republic business customers, validating the DIČ (Daňové identifikační číslo) at checkout determines whether to apply 21% VAT (B2C) or zero-rate the sale (B2B reverse charge). This directly affects your invoicing, revenue recognition, and quarterly VAT return figures.
Supplier and partner onboarding
For ERP systems, procurement platforms, and DAC7-regulated marketplaces, validating aCzech Republic supplier's DIČ (Daňové identifikační číslo) during onboarding prevents invalid numbers from entering your accounting system — which can cause rejected invoices and audit failures. Validate once at onboarding, then periodically re-validate to catch deregistrations.
About Czech Republic VAT format (DIČ)
Czech VAT numbers (DIČ) can have 8 digits (legal entities), 9 digits (individuals), or 10 digits (foreign entities). In 2024 Czech Republic simplified from 3 rates to 2 rates (21% and 12%).
| Field | Value |
|---|---|
| Country code | CZ |
| Local name | DIČ (Daňové identifikační číslo) |
| Format | CZ + 8, 9, or 10 digits |
| Regex pattern | ^CZ[0-9]{8,10}$ |
| Example | CZ12345678 |
| VIES supported | Yes |
VAT rates in Czech Republic
Czech Republic applies a standard DIČ rate of 21%. Reduced rates of 12% apply to essential goods and services.
| Rate type | Percentage | Currency |
|---|---|---|
| Standard rate | 21% | CZK |
| Reduced rate | 12% | CZK |
Frequently asked questions
What is the Czech Republic VAT number format?
Czech Republic VAT numbers (DIČ (Daňové identifikační číslo)) follow the format: CZ + 8, 9, or 10 digits. A valid example is CZ12345678. The TaxID API validates both the format locally and the registration status via VIES, ensuring you only accept properly registered EU businesses.
Is VAT validation mandatory for selling to Czech Republic businesses?
EU VAT law requires that suppliers verify a customer's VAT registration before applying zero-rate treatment to intra-community B2B supplies. If you sell goods or services to a Czech Republic business without VAT and their registration is invalid, your company may be liable for the full VAT amount plus interest and penalties. Validation is not just recommended — it is your legal due diligence obligation.
What is the standard VAT rate in Czech Republic?
The standard VAT rate in Czech Republic is 21% (DIČ). Reduced rates of 12% apply to certain goods and services such as food, books, and medical supplies. The TaxID API's /rates endpoint returns all current rates for programmatic access.
How long does Czech Republic VAT validation take with TaxID?
For cached results (previously validated in the last 24 hours), the TaxID API responds in under 10ms. For uncached requests, the VIES SOAP call to the Czech Republic tax authority typically completes in 100–400ms. Active (valid) numbers are cached for 24 hours; invalid numbers are cached for 1 hour to balance performance with freshness.
Does the TaxID API support VIES for Czech Republic?
Yes. Czech Republic is fully supported by the EU VIES system and the TaxID API. VIES validates Czech Republic VAT numbers in real time against the Czech Republic national tax authority's registration database. Czech VAT numbers (DIČ) can have 8 digits (legal entities), 9 digits (individuals), or 10 digits (foreign entities). In 2024 Czech Republic simplified from 3 rates to 2 rates (21% and 12%).
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