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Validate Denmark VAT Numbers via API
When building B2B applications that serve Denmark (Danmark), validating your customers' Moms-nummer / CVR-nummer is essential for EU VAT compliance and protecting your business from tax liability.
The TaxID API provides instant validation of Denmark 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.Denmark applies a standard VAT rate of 25% (Moms-nummer / CVR-nummer) and is fully supported by the VIES system.
QUICK START
curl -H "Authorization: Bearer YOUR_API_KEY" \ http://localhost:3000/api/v1/validate/DK/DK12345678
Code examples
Choose your language. Every example validates a Denmark VAT number and returns the registration status with company details.
const res = await fetch('http://localhost:3000/api/v1/validate/DK/DK12345678', {
headers: { 'Authorization': 'Bearer YOUR_API_KEY' }
});
const data = await res.json();
// { valid: true, status: "active", company_name: "...", country_code: "DK", cached: false }
console.log(data);When to validate Denmark VAT numbers
B2B cross-border sales
When selling goods or services to Denmark businesses in other EU member states, you must verify their Moms-nummer / CVR-nummer 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 Denmark business customers, validating the Moms-nummer / CVR-nummer at checkout determines whether to apply 25% 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 aDenmark supplier's Moms-nummer / CVR-nummer 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 Denmark VAT format (Moms-nummer / CVR-nummer)
Denmark has a flat 25% VAT rate with no reduced rates, making it one of the simpler EU VAT systems. The VAT number is the same as the CVR (Central Business Register) number with the DK prefix added.
| Field | Value |
|---|---|
| Country code | DK |
| Local name | Moms-nummer / CVR-nummer |
| Format | DK + 8 digits |
| Regex pattern | ^DK[0-9]{8}$ |
| Example | DK12345678 |
| VIES supported | Yes |
VAT rates in Denmark
Denmark applies a standard Moms-nummer / CVR-nummer rate of 25%.
| Rate type | Percentage | Currency |
|---|---|---|
| Standard rate | 25% | DKK |
Frequently asked questions
What is the Denmark VAT number format?
Denmark VAT numbers (Moms-nummer / CVR-nummer) follow the format: DK + 8 digits. A valid example is DK12345678. 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 Denmark 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 Denmark 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 Denmark?
The standard VAT rate in Denmark is 25% (Moms-nummer / CVR-nummer). Denmark applies a single flat rate with no reduced rates. The TaxID API's /rates endpoint returns all current rates for programmatic access.
How long does Denmark 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 Denmark 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 Denmark?
Yes. Denmark is fully supported by the EU VIES system and the TaxID API. VIES validates Denmark VAT numbers in real time against the Denmark national tax authority's registration database. Denmark has a flat 25% VAT rate with no reduced rates, making it one of the simpler EU VAT systems. The VAT number is the same as the CVR (Central Business Register) number with the DK prefix added.
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