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Validate Norway Tax ID Numbers via API
When building B2B applications that serve Norway (Norge), validating your customers' MVA-nummer (Merverdiavgiftsnummer) is essential for B2B compliance and protecting your business from tax liability.
The TaxID API provides instant format validation and live lookup for Norway MVA-nummer numbers via Skatteetaten (Norwegian Tax Administration). Every request returns the validation status with sub-100ms response times for cached results.Norway applies a standard rate of 25% (MVA-nummer).
QUICK START
curl -H "Authorization: Bearer YOUR_API_KEY" \ http://localhost:3000/api/v1/validate/NO/NO123456789MVA
Code examples
Choose your language. Every example validates a Norway VAT number and returns the registration status with company details.
const res = await fetch('http://localhost:3000/api/v1/validate/NO/NO123456789MVA', {
headers: { 'Authorization': 'Bearer YOUR_API_KEY' }
});
const data = await res.json();
// { valid: true, status: "active", company_name: "...", country_code: "NO", cached: false }
console.log(data);When to validate Norway tax ID numbers
B2B invoicing and accounts payable
When issuing or receiving invoices from Norway businesses, validating the MVA-nummer (Merverdiavgiftsnummer) ensures the identifier is genuine before committing the transaction to your ERP. Invalid or fabricated tax IDs are a leading vector for invoice fraud and can result in rejected filings or audit penalties.
SaaS and e-commerce checkout
If your platform serves Norway business customers, collecting and validating their MVA-nummer (Merverdiavgiftsnummer) at checkout is required for accurate tax treatment, correct invoicing, and downstream reporting. An invalid tax ID at the point of sale creates a correction burden across your finance stack.
Supplier and marketplace onboarding
For procurement platforms and regulated marketplaces onboarding Norway sellers or vendors, validating the MVA-nummer (Merverdiavgiftsnummer) at registration prevents fraudulent or duplicate accounts from entering your ecosystem. Validate once at onboarding, then re-validate periodically to detect deregistrations or changes.
About Norway VAT format (MVA-nummer)
Norway is part of the European Economic Area (EEA) but not the EU, so Norwegian VAT numbers are not available via VIES. They are validated through the Brønnøysundregistrene (Norwegian Business Register) REST API. The MVA suffix distinguishes the VAT number from the organisation number.
| Field | Value |
|---|---|
| Country code | NO |
| Local name | MVA-nummer (Merverdiavgiftsnummer) |
| Format | NO + 9 digits + MVA |
| Regex pattern | ^NO[0-9]{9}MVA$ |
| Example | NO123456789MVA |
| VIES supported | No |
VAT rates in Norway
Norway applies a standard MVA-nummer rate of 25%. Reduced rates of 15% and 12% apply to essential goods and services.
| Rate type | Percentage | Currency |
|---|---|---|
| Standard rate | 25% | NOK |
| Reduced rate | 15% | NOK |
| Reduced rate | 12% | NOK |
Frequently asked questions
What is the Norway tax ID number format?
Norway tax ID numbers (MVA-nummer (Merverdiavgiftsnummer)) follow the format: NO + 9 digits + MVA. A valid example is NO123456789MVA. The TaxID API validates the format locally and where possible checks against the Skatteetaten (Norwegian Tax Administration), ensuring you only accept properly registered businesses.
Should I validate MVA-nummer numbers when transacting with Norway businesses?
Validating MVA-nummer numbers reduces fraud risk, prevents invalid identifiers from entering your accounting system, and is required by many B2B contracts and procurement platforms. While mandatory rules vary by jurisdiction, validating at onboarding is widely considered best practice — especially for SaaS, marketplace, and fintech platforms with global customer bases.
What is the standard tax rate in Norway?
The standard tax rate in Norway is 25% (MVA-nummer). Reduced rates of 15% and 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 Norway tax ID validation take with TaxID?
For cached results (previously validated in the last 24 hours), the TaxID API responds in under 10ms. Format validation is instantaneous. For uncached requests requiring a live lookup against Skatteetaten (Norwegian Tax Administration), response time is typically 100–500ms. Valid numbers are cached for 24 hours; invalid numbers are cached for 1 hour.
How does the TaxID API validate Norway MVA-nummer numbers?
The TaxID API validates Norway MVA-nummer numbers in two steps: first it checks the format against the official pattern (NO + 9 digits + MVA), then it queries Skatteetaten (Norwegian Tax Administration) where a live API is available. Norway is part of the European Economic Area (EEA) but not the EU, so Norwegian VAT numbers are not available via VIES. They are validated through the Brønnøysundregistrene (Norwegian Business Register) REST API. The MVA suffix distinguishes the VAT number from the organisation number.
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