What Is a Company Registration Number?

A Simple Guide to Company Registration Numbers

Between 2021 and 2022, Companies House recorded 753,168 new company incorporations across the UK. While this represented a slight decrease of 7.1% compared to the previous year, incorporations remained high despite expectations of a surge during the pandemic. To support businesses during this period, Companies House introduced temporary easements to allow more time for compliance.

If you run a limited company, staying compliant with UK regulations is essential. One of the most important requirements is registering your company with Companies House. This guide explains what a company registration number is, why it matters, and how it affects your business.

Key Takeaways

• A company registration number (CRN) is a unique identifier issued by Companies House when a company is incorporated and remains unchanged for the company’s lifetime.

• The CRN allows anyone to verify your company’s legal status, structure, and filing history via the public register.

• CRN formats vary by jurisdiction (England & Wales, Scotland, or Northern Ireland) and usually consist of eight characters or a letter prefix followed by digits.

• You are legally required to display your CRN on official company materials, including invoices, emails, letterheads, and your website.

• A CRN is different from tax references such as your UTR or VAT number, each has a separate purpose.

• Even if your company changes its name or registered address, the CRN remains the same and continues to identify the same legal entity.

What Is a Company Registration Number?

When you incorporate a business, Companies House issues a company registration number, which uniquely identifies your company. This number is typically eight characters long and is required for legal, financial, and administrative purposes.

In the UK, Companies House acts as the official registrar for limited companies and LLPs and is responsible for issuing CRNs. You may also hear this number referred to as a company number or corporate number.

In other countries, similar identifiers exist. For example, in Ireland it is known as a CRO number. Regardless of the name, this number forms a core part of your company’s legal identity and must appear on all official correspondence.

Why Is a Company Registration Number Important?

Your CRN is the primary way your company is identified. Business names can be similar or even identical in some cases, but no two companies share the same registration number.

Displaying your CRN helps confirm your business is properly registered and legitimate. It builds confidence with customers, suppliers, and partners, and allows anyone to quickly access your company details, including filing history and registered office address.

How to Find Your Company Registration Number

Check Your Company Documents

Your CRN can usually be found on official paperwork such as your Certificate of Incorporation, annual accounts, and correspondence from Companies House.

Search Companies House

You can also search for your company by name on the Companies House website. Your registration number will appear alongside your company details, giving you access to filings, officer information, and registered addresses.

Use Your Formation Agent Portal

If you formed your company through a formation provider, your CRN will usually be available in your online account. Businesses registered with My Company Registration can log in to their dashboard, select “My Companies”, and view the registration number directly.

Supporting Businesses at Every Stage

A company registration number works much like a fingerprint, it is unique and permanently linked to your business. Having a CRN is essential for protecting your company identity, meeting legal obligations, and operating with confidence.

My Company Registration takes care of the company formation process, handling all the formalities so you can focus on running and growing your business. Visit our website to explore our services or contact us for tailored support.

FAQs

What is a company registration number (CRN)?

A CRN is a unique number issued by Companies House to every incorporated UK company. It stays the same for the entire life of the business and confirms its legal identity.

It is different from tax references or VAT numbers, which serve separate regulatory purposes.

Who needs a company registration number?

All limited companies and LLPs registered with Companies House receive a CRN. Sole traders and general partnerships do not, as they register directly with HMRC instead.

Where can I find my company registration number?

You can find your CRN on your Certificate of Incorporation, Companies House letters, and on the public Companies House register. It is commonly required for banks, tax filings, and official forms.

What format does a UK company registration number follow?

CRN formats vary depending on where the company is registered:

• Eight digits for England & Wales (e.g. 01234567)

• Letter prefixes such as SC (Scotland) or NI (Northern Ireland) followed by numbers

When must I display my company registration number?

You must show your CRN on all official business materials, including invoices, emails, letterheads, and your website footer. This ensures transparency and legal compliance.

Can my company registration number change?

No. Your CRN stays the same even if you change your company name, address, or directors. It always refers to the same legal entity.

How is the CRN used in everyday business?

You will use your CRN when filing accounts, submitting confirmation statements, registering for Corporation Tax, and opening a business bank account. It is a key reference for official and financial processes.