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Validate Hong Kong Tax ID Numbers via API
When building B2B applications that serve Hong Kong (香港 (Heung Gong)), validating your customers' Business Registration Number (BR Number) is essential for B2B compliance and protecting your business from tax liability.
The TaxID API provides instant format validation and live lookup for Hong Kong Business Registration Number numbers via IRD (Inland Revenue Department). Every request returns the validation status with sub-100ms response times for cached results.Hong Kong applies a standard rate of 0% (no VAT/GST) (Business Registration Number).
QUICK START
curl -H "Authorization: Bearer YOUR_API_KEY" \ http://localhost:3000/api/v1/validate/HK/12345678
Code examples
Choose your language. Every example validates a Hong Kong VAT number and returns the registration status with company details.
const res = await fetch('http://localhost:3000/api/v1/validate/HK/12345678', {
headers: { 'Authorization': 'Bearer YOUR_API_KEY' }
});
const data = await res.json();
// { valid: true, status: "active", company_name: "...", country_code: "HK", cached: false }
console.log(data);When to validate Hong Kong tax ID numbers
B2B invoicing and accounts payable
When issuing or receiving invoices from Hong Kong businesses, validating the Business Registration Number (BR Number) 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 Hong Kong business customers, collecting and validating their Business Registration Number (BR Number) 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 Hong Kong sellers or vendors, validating the Business Registration Number (BR Number) 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 Hong Kong VAT format (Business Registration Number)
Hong Kong has no VAT or GST. Its standard rate is 0% — making it one of the few major financial centers without consumption tax. The Business Registration Number (BR) is an 8-digit identifier issued by the Companies Registry and IRD. HK is a critical hub for APAC B2B SaaS and fintech.
| Field | Value |
|---|---|
| Country code | HK |
| Local name | Business Registration Number (BR Number) |
| Format | 8 digits |
| Regex pattern | ^[0-9]{8}$ |
| Example | 12345678 |
| VIES supported | No |
VAT rates in Hong Kong
Hong Kong applies a standard Business Registration Number rate of 0%.
| Rate type | Percentage | Currency |
|---|---|---|
| Standard rate | 0% | HKD |
Frequently asked questions
What is the Hong Kong tax ID number format?
Hong Kong tax ID numbers (Business Registration Number (BR Number)) follow the format: 8 digits. A valid example is 12345678. The TaxID API validates the format locally and where possible checks against the IRD (Inland Revenue Department), ensuring you only accept properly registered businesses.
Should I validate Business Registration Number numbers when transacting with Hong Kong businesses?
Validating Business Registration Number 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 Hong Kong?
The standard tax rate in Hong Kong is 0% (Business Registration Number). Hong Kong 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 Hong Kong 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 IRD (Inland Revenue Department), 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 Hong Kong Business Registration Number numbers?
The TaxID API validates Hong Kong Business Registration Number numbers in two steps: first it checks the format against the official pattern (8 digits), then it queries IRD (Inland Revenue Department) where a live API is available. Hong Kong has no VAT or GST. Its standard rate is 0% — making it one of the few major financial centers without consumption tax. The Business Registration Number (BR) is an 8-digit identifier issued by the Companies Registry and IRD. HK is a critical hub for APAC B2B SaaS and fintech.
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