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Validate Iceland Tax ID Numbers via API
When building B2B applications that serve Iceland (Ísland), validating your customers' VSK-númer (Virðisaukaskattsnúmer) is essential for B2B compliance and protecting your business from tax liability.
The TaxID API provides instant format validation and live lookup for Iceland VSK-númer numbers via RSK (Ríkisskattstjóri / Directorate of Internal Revenue). Every request returns the validation status with sub-100ms response times for cached results.Iceland applies a standard rate of 24% (VSK-númer).
QUICK START
curl -H "Authorization: Bearer YOUR_API_KEY" \ http://localhost:3000/api/v1/validate/IS/IS123456
Code examples
Choose your language. Every example validates a Iceland VAT number and returns the registration status with company details.
const res = await fetch('http://localhost:3000/api/v1/validate/IS/IS123456', {
headers: { 'Authorization': 'Bearer YOUR_API_KEY' }
});
const data = await res.json();
// { valid: true, status: "active", company_name: "...", country_code: "IS", cached: false }
console.log(data);When to validate Iceland tax ID numbers
B2B invoicing and accounts payable
When issuing or receiving invoices from Iceland businesses, validating the VSK-númer (Virðisaukaskattsnúmer) 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 Iceland business customers, collecting and validating their VSK-númer (Virðisaukaskattsnúmer) 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 Iceland sellers or vendors, validating the VSK-númer (Virðisaukaskattsnúmer) 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 Iceland VAT format (VSK-númer)
Iceland is part of the EEA but not the EU, so its VAT numbers are not in VIES. Iceland applies a 24% standard rate and 11% reduced rate (food, accommodation, books). The VSK-númer is 5 or 6 digits and is validated by RSK (the Icelandic Directorate of Internal Revenue).
| Field | Value |
|---|---|
| Country code | IS |
| Local name | VSK-númer (Virðisaukaskattsnúmer) |
| Format | IS + 5 or 6 digits |
| Regex pattern | ^IS[0-9]{5,6}$ |
| Example | IS123456 |
| VIES supported | No |
VAT rates in Iceland
Iceland applies a standard VSK-númer rate of 24%. Reduced rates of 11% apply to essential goods and services.
| Rate type | Percentage | Currency |
|---|---|---|
| Standard rate | 24% | ISK |
| Reduced rate | 11% | ISK |
Frequently asked questions
What is the Iceland tax ID number format?
Iceland tax ID numbers (VSK-númer (Virðisaukaskattsnúmer)) follow the format: IS + 5 or 6 digits. A valid example is IS123456. The TaxID API validates the format locally and where possible checks against the RSK (Ríkisskattstjóri / Directorate of Internal Revenue), ensuring you only accept properly registered businesses.
Should I validate VSK-númer numbers when transacting with Iceland businesses?
Validating VSK-númer 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 Iceland?
The standard tax rate in Iceland is 24% (VSK-númer). Reduced rates of 11% 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 Iceland 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 RSK (Ríkisskattstjóri / Directorate of Internal Revenue), 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 Iceland VSK-númer numbers?
The TaxID API validates Iceland VSK-númer numbers in two steps: first it checks the format against the official pattern (IS + 5 or 6 digits), then it queries RSK (Ríkisskattstjóri / Directorate of Internal Revenue) where a live API is available. Iceland is part of the EEA but not the EU, so its VAT numbers are not in VIES. Iceland applies a 24% standard rate and 11% reduced rate (food, accommodation, books). The VSK-númer is 5 or 6 digits and is validated by RSK (the Icelandic Directorate of Internal Revenue).
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