Business Registration Number vs Company Registration Number: What's the Difference, and Which One Goes Where

At a glance

The business registration certificate normally shows a long string in the form 12345678-XXX-XX-XX-X. Only the first 8 digits are the business registration number itself; the groups after it are the branch code, certificate year and so on. When someone asks for your BR number, they generally want those first 8 digits.

How do you tell them apart? Where do you look?

Put the company’s two certificates side by side and it is obvious at a glance:

The certificate of incorporation (CI) certifies that the company exists in law. The number is in the top left corner, traditionally 7 digits. There is only ever one of these, it never needs renewing, and it is only reissued if the company changes its name.

The business registration certificate (BR) certifies that the business is registered with the IRD. The number is at the top of the certificate, 8 digits. This one has to be renewed every year (or every three years), and there is a penalty for letting it lapse.

One speaks to whether the company exists; the other to whether the business is registered for tax. Two separate things — hence two certificates and two numbers.

For how these two certificates fit into the wider setup process, see the complete guide to setting up a Hong Kong company.

Which one does the bank want?

Bring both. Opening an account, a bank will generally ask for the CI and the BR (usually originals or certified copies), along with the articles and identity documents for the directors and shareholders.

But when someone just wants “the number” — a customer setting up a supplier account, a platform asking you to fill in company details, a government department’s form — it is almost always the business registration number.

An easy way to remember it:

• They want to verify the company exists → company registration number (used to search the Companies Registry)
• They want to do business with you, invoice you, or file tax → business registration number

The government unified the identifiers — does that affect me?

This is the part most people have not caught up with.

The Hong Kong government has been rolling out the Unique Business Identifier (UBI), the aim being that one company uses the same number across different government departments instead of carrying several.

In practice: the business registration number is used as the unified identifier. The Companies Registry has adopted the same number so that the old and new systems line up.

What that means for you:

• Newly incorporated companies have matching numbers, so there is nothing to confuse
• For companies incorporated earlier, the identifier in government systems has already been unified, but the old CI in your hand still shows the original number
• When searching the registry or logging into e-services, if the old number does not find anything, try the business registration number

The exact commencement date and transitional details are as published by the Companies Registry. If your company was incorporated some years ago and a search does not match, asking the Companies Registry directly is the safest route.

What happens if you use the wrong one?

Filling in the wrong number day to day usually just means being asked to resubmit the right details — no legal consequence.

Two situations warrant more care:

1. Tax filing and tax documents. The wrong number can mean your filing does not match the IRD’s file, and in the worst case is treated as not filed at all.

2. Contracts and legal documents. Wrong identifying details in a contract can mean having to prove the contracting party’s identity if a dispute arises later. A properly drafted contract normally sets out the full company name, the registration number and the registered address together — with all three, it is hard to get wrong.

The safe habit: whenever you have to fill in a company number, take out the certificate and check it. Do not go from memory.

What about unincorporated businesses?

Sole proprietorships and partnerships (unincorporated businesses) have only a business registration number, no company registration number.

The reason is simple: they are not legal persons incorporated at the Companies Registry — they are businesses registered with the IRD. So they have a BR and no CI.

That is one of the practical differences too: if someone asks you for a certificate of incorporation and you are a sole proprietor, there is nothing to give them. For the full comparison, see limited company vs sole proprietorship vs partnership.

When in doubt, check the certificate

Neither number is complicated. The difficulty is that nobody explains it at the outset, so you end up with two certificates and two strings of digits and guess when it matters.

If you would rather someone else kept track of the renewal dates and the statutory filing deadlines, talk to us, or get started.

Information here follows the Companies Registry and the IRD. If the transitional arrangements for the unique business identifier are updated, the official announcements govern.