What is a Company Registration Number?

  • 3 min read

A company registration number (CRN) is a unique identifier that Companies House assigns to your company upon incorporation. Every newly incorporated UK limited company is given a CRN by Companies House.

The CRN is always 8 digits. Either 2 letters followed by 6 numbers or just 8 numbers.

The CRN will usually look like this:

Eight Numbers: 01234567

2 letters and 6 Numbers: AB012345

In order to get a company registration number, you first have to register your company. You can use MachFast.com to easily register your company in minutes. Once Companies House assigns a computer generated number, you cannot change it or personalise the number.

Furthermore, when searching for your CRN on the Companies House Search, note that it can sometimes be referred to as a ‘Companies House Number’.

The various letters and numbers in the CRN indicate different details about the company. For example:

  • If the CRN is only an 8 digit number then the companies are formed in England or Wales
  • The “OC” prefix indicates a limited liability partnership (LLP) that has been formed in England and Wales.
  • The “LP” prefix indicates a Limited Partnership that has been formed in England or Wales.
  • The “SC” prefix indicates that the company has been formed in Scotland.
  • The “SO” prefix indicated a Limited Liability Company that has been formed in Scotland
  • The “SL” prefix indicates a Limited Partnership Company that has been formed in Scotland.
  • The “NI” prefix indicates a Limited Company that has been formed in Northern Ireland.
  • The “NC” prefix indicated a Limited Liability Partnership that has been formed in Northern Ireland.
  • The “NL” prefix indicates a Limited Partnership Company that has been formed in Northern Ireland.

Where do I Find my Company Registration Number?

Your CRN will be displayed on your Certificate of Incorporation and it will also be on any Companies House statutory mail you receive. If you register your company with MachFast however, all your important information is stored within the app.

If you still can’t find your CRN, you can easily search for it on the Companies House website by following these steps:

  1. Log into Companies House WebCheck service.
  2. Enter the name of your company in the yellow box and click search.
  3. Your Company Registration Number will be located on the left hand side of your company name.

When will I use my Company Registration Number?

Generally you’ll be required to use your company registration number in a number of circumstances. We have outlined some of the most common circumstances:

  • Changing your company name
  • Changing your registered office/SAIL address
  • Adding or removing a company director or secretary
  • Changing the details of directors and secretaries
  • Filing annual Confirmation Statements
  • Paying Corporation Tax
  • Filing Company Tax Returns
  • Filing copies of resolutions
  • Filing annual accounts
  • Registering for business taxes
  • Communicating with Companies House
  • Increasing share capital
  • Issuing share certificates
  • Issuing dividend vouchers
  • Changing your accounting reference date (ARD)
  • Submitting annual returns

Where do Companies usually display their Company Registration Number?

It is a legal requirement to display the company registration number of your company on all company stationary. Common examples of this are:

  • Official letters, faxes, and emails
  • Compliments slips
  • Order forms
  • Invoices and receipts
  • Company website

It is important to not confuse this number with any of the other numbers uniquely identifying your business. For example, your company’s unique taxpayer reference (UTR), your VAT number and your employer reference number.
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