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Validate Slovakia VAT Numbers via API
When building B2B applications that serve Slovakia (Slovensko), validating your customers' IČ DPH (Identifikačné číslo pre daň z pridanej hodnoty) is essential for EU VAT compliance and protecting your business from tax liability.
The TaxID API provides instant validation of Slovakia 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.Slovakia applies a standard VAT rate of 23% (IČ DPH) and is fully supported by the VIES system.
QUICK START
curl -H "Authorization: Bearer YOUR_API_KEY" \ http://localhost:3000/api/v1/validate/SK/SK1234567890
Code examples
Choose your language. Every example validates a Slovakia VAT number and returns the registration status with company details.
const res = await fetch('http://localhost:3000/api/v1/validate/SK/SK1234567890', {
headers: { 'Authorization': 'Bearer YOUR_API_KEY' }
});
const data = await res.json();
// { valid: true, status: "active", company_name: "...", country_code: "SK", cached: false }
console.log(data);When to validate Slovakia VAT numbers
B2B cross-border sales
When selling goods or services to Slovakia businesses in other EU member states, you must verify their IČ DPH (Identifikačné číslo pre daň z pridanej hodnoty) 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 Slovakia business customers, validating the IČ DPH (Identifikačné číslo pre daň z pridanej hodnoty) at checkout determines whether to apply 23% 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 aSlovakia supplier's IČ DPH (Identifikačné číslo pre daň z pridanej hodnoty) 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 Slovakia VAT format (IČ DPH)
Slovakia increased its standard VAT rate from 20% to 23% in January 2025 as part of fiscal consolidation. The IČ DPH is a 10-digit number that must pass a modulo 11 check digit validation.
| Field | Value |
|---|---|
| Country code | SK |
| Local name | IČ DPH (Identifikačné číslo pre daň z pridanej hodnoty) |
| Format | SK + 10 digits |
| Regex pattern | ^SK[0-9]{10}$ |
| Example | SK1234567890 |
| VIES supported | Yes |
VAT rates in Slovakia
Slovakia applies a standard IČ DPH rate of 23%. Reduced rates of 19% and 5% apply to essential goods and services.
| Rate type | Percentage | Currency |
|---|---|---|
| Standard rate | 23% | EUR |
| Reduced rate | 19% | EUR |
| Reduced rate | 5% | EUR |
Frequently asked questions
What is the Slovakia VAT number format?
Slovakia VAT numbers (IČ DPH (Identifikačné číslo pre daň z pridanej hodnoty)) follow the format: SK + 10 digits. A valid example is SK1234567890. 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 Slovakia 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 Slovakia 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 Slovakia?
The standard VAT rate in Slovakia is 23% (IČ DPH). Reduced rates of 19% and 5% 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 Slovakia 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 Slovakia 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 Slovakia?
Yes. Slovakia is fully supported by the EU VIES system and the TaxID API. VIES validates Slovakia VAT numbers in real time against the Slovakia national tax authority's registration database. Slovakia increased its standard VAT rate from 20% to 23% in January 2025 as part of fiscal consolidation. The IČ DPH is a 10-digit number that must pass a modulo 11 check digit validation.
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