Confusing these two is a common mistake for new entrepreneurs, but understanding the difference is vital for tax filings, bank applications, and legal compliance. In this guide, HKWJ Tax Law explains the distinct roles of each and where to find them.
Key Differences at a Glance: BRN vs. CRN
| Feature | Company Registration Number (CRN) | Business Registration Number (BRN) |
|---|---|---|
| Issuing Authority | Companies Registry (CR) | Inland Revenue Department (IRD) |
| Document Found On | Certificate of Incorporation (CI) | Business Registration Certificate (BRC) |
| Purpose | Legal “Birth Certificate” of the entity. | Tax Identification & Operating License. |
| Format | 7 or 8 digits. | First 8 digits of the BRC number. |
| Who Needs It? | Only Incorporated Companies. | All businesses (incl. Sole Proprietors). |
What is a Business Registration Number (BRN)?
The BRN is issued by the Inland Revenue Department (IRD). Every business entity operating in Hong Kong—whether it is a massive corporation or a small sole proprietorship—must have a BRN.
The BRN is your tax identification number. It is the first 8 digits of your Business Registration Certificate (BRC) number (e.g., 12345678-XXX-XX-XX-X). You will need this number for:
- Opening a business bank account.
- Filing Profits Tax Returns (PTR).
- Registering for MPF (Mandatory Provident Fund) for employees.
- Signing commercial contracts and leases.
Where to find it: Look at your Business Registration Certificate (BRC) under the box labeled “Certificate No.”
What is a Company Registration Number (CRN)?
The CRN is issued by the Hong Kong Companies Registry. It is assigned the moment your company is legally “born.”
Think of the CRN as your company’s social security number or birth certificate number. It identifies your business as a legal “person” in the eyes of the Hong Kong government. You will need this number when:
- Filing Annual Returns (NAR1).
- Changing company directors or shareholders.
- Changing the company name.
Where to find it: Look at your Certificate of Incorporation (CI). The CRN is usually located in the top left or right corner.
Important 2024 Compliance Update: The Transition to Unique Business Identifier (UBI)
Since late 2023, the Hong Kong Companies Registry has implemented the Unique Business Identifier (UBI). This is a major regulatory shift designed to streamline company identification across different government departments.
What has changed for your statutory filings?
Previously, the Company Registration Number (CRN) was the primary identifier for the Companies Registry. However, under the new UBI system, the Business Registration Number (BRN)—the first eight digits of your Business Registration Certificate—has now replaced the CRN as the primary identifier on key statutory forms.
For example, when filing your Form NAR1 (Annual Return), you are now required to provide your BRN for company identification. While your CRN still remains a valid historical record on your Certificate of Incorporation, the BRN has now become the “Universal Key” for both the Inland Revenue Department and the Companies Registry. Ensuring you use the correct 8-digit BRN on these forms is essential to avoid filing rejections or compliance delays.
Understanding your identification numbers is just one part of your documentation. For a complete list of every certificate and form your business needs to hold, refer to our Hong Kong business registration documents checklist.
Costs and Renewal Fees for the Business Registration Certificate (BRC)
Unlike the Company Registration Number (CRN), which is issued once and stays with the company forever at no extra cost, the Business Registration Number (BRN) is tied to a certificate that must be renewed. There are two types of business registration certificate, namely 1-year certificate and 3-year certificate.
Business Registration Fee Schedule (Effective from 1 April, 2025 – 31 March, 2026)
| Certificate Duration | Registration Fee | Levy (Insolvency Fund) | Total Fee Payable |
|---|---|---|---|
| 1-Year Certificate | HK$2,200 | HK$0 | HK$2,200 |
| 3-Year Certificate | HK$5,720 | HK$300 | HK$6,020 |
The CRN Fee is One-Off: You pay a one-time incorporation fee (HK$1,545 for electronic submission / HK$1,720 for hard copies) to get your CRN. You do not pay to “renew” the CRN itself, though you must file an Annual Return (NAR1) with a small filing fee (HK$105).
The BRN Fee is Recurring: Your BRN remains the same, but you must pay the fees above every 1 or 3 years to keep the certificate valid. Operating a business with an expired BRC (even if your CRN is active) can lead to heavy fines and prosecution.
Do I Need Both BRN and CRN?
If you have incorporated a Limited Company, yes—you must have both.
If you are operating as a Sole Proprietor or a Partnership, you will only have a BRN, as you have not created a separate legal entity through the Companies Registry.
The Compliance Connection: Why the Difference Matters
As a tax law firm, we often see clients struggle because they provide the CRN when the IRD requires the BRN. For example, when you submit your annual tax audit, the IRD tracks your file via the BRN. Conversely, when you update your company’s Articles of Association, the Companies Registry tracks the change via the CRN.
Ready to start the business registration process? Return to our Step-by-Step Guide to Opening a Company in Hong Kong.
Common Questions about BRN and CRN
1. Is the BRN the same as my Tax ID?
Yes. For all intents and purposes, the 8-digit BRN is your Taxpayer Identification Number (TIN). You will use this number on all Profits Tax Returns and employer’s returns filed with the Inland Revenue Department.
2. If I change my company name, do I get a new CRN or BRN?
No. Your identification numbers stay the same. You will receive a “Certificate of Change of Name,” but your original CRN and BRN will continue to identify your business entity.
Need Help with Your Hong Kong Compliance?
Understanding the difference between a BRN and a CRN is just the start of maintaining a compliant business in Hong Kong. From annual audits to offshore tax claims, the team at HKWJ Tax Law is here to ensure your corporate structure is managed with legal precision.
Contact HKWJ Tax Law today to discuss your company setup or compliance needs.
