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Company Registration Number in the UK: A Guide

Company Registration Number in UK
Published on: 26 May 2025By Aaron Richards

What is a Company Registration Number (CRN)? What are its purposes and the benefits it serves? This write-up has your back! Here is everything you need to know about the company registration number in the UK, including its rules, benefits, and frequently asked questions.

What is the Company Registration Number (CRN) in the UK?

In the UK, the CRN refers to a unique identifier assigned to an entity at the time of incorporation. Various government bodies, including Companies House, use this code to verify a business’s identity. Moreover, CRN is indicated differently in different jurisdictions.

Depending on where your company is registered, its registration number may contain a string of numbers or a combination of letters and numbers. The alphabets typically indicate the jurisdiction in which your company is incorporated, while the numbers denote the registration code.

The laws require registered entities to display their CRN on their website and in business documents, such as purchase orders and invoices. Every CRN is unique, non-interchangeable, and stays valid for a lifetime.

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What does the UK Company Registration Number (CRN) look like?

A company registration number in the UK typically consists of eight characters. These characters constitute a mix of letters and numbers or only numbers, depending on the area of incorporation. The examples below will help you understand what we mean by different CRNs.

Jurisdiction / Structure

CRN Format Examples

Notes

England & Wales (Ltd/PLC)

12345678

Most common format: no prefix.

Scotland (Ltd/PLC)

SC123456

The prefix SC shows that the company is registered in Scotland.

Northern Ireland (Ltd/PLC)

NI123456

NI denotes that the entity is registered in Northern Ireland.

Wales (Ltd/PLC)

12345678

Shares format with England

Limited Liability Partnership (LLP)

OC123456

OC stands for Other Companies, typically LLPs registered in England and Wales.

Who Must Have a Company Registration Number in the UK?

The following business structures must have a company registration number in the UK to operate legally:

  • Private limited companies
  • Public limited companies
  • Limited Liability Partnerships
  • Community Interest Companies (CIC)
  • Guarantee Companies
  • Unlimited Companies

Note: Once entities have completed the company strike-off procedure, the CRN will no longer exist. 

Where Must You Mention Your UK Company Registration Number (CRN)

Registered entities in the UK must include the CRN in various business documents. These include, but are not limited to:

Statutory Filing with Companies House

  • Annual accounts
  • Confirmation statements (also known as annual returns)
  • Incorporation documents
  • Company name change requests
  • Director or secretary appointments/removals
  • Changes to registered office or share capital

HMRC Correspondence and Filings

  • Corporation tax registration
  • VAT registration
  • PAYE registration
  • Tax returns
  • Employment-related filings

Business-related documents

  • Invoices
  • Credit notes
  • Receipts

Business Stationery and Official Correspondence

  • Letterheads
  • Emails
  • Order forms

Legal Contracts

  • Supplier and client contracts
  • Partnership or joint venture agreements
  • Shareholder agreements

In addition to that, citing CRN becomes crucial when;

  • Applying for the government tenders
  • Filing taxes
  • Applying for a business loan
  • Seeking investment funds
  • Issuing share certificates

Benefits of a Company Registration Number in the UK

Having a company registration number in the UK can bring several advantages to a business owner. These include, but are not limited to:

A CRN reinforces an independent legal identity for a registered company. This distinct identity makes businesses identifiable among hundreds of competitors, easing the way for investors and vendors.

Companies can use CRN on the tax portal to file tax returns seamlessly, eliminating the need for a tiresome assessment. Tax authorities need the CRN to identify the company’s tax details and records.

A standout perk of a CRN is that it enables companies to apply for government grants and tax incentives seamlessly, without wasting precious time on assessments.

Whether you want to partner with vendors or expand into other jurisdictions, having a CRN can open doors to lucrative business opportunities.

How to register a company and obtain your UK registration number?

The company formation in the UK and securing CRN requires following the given steps:

The company registration process begins with deciding on the company structure. Ensure that you factor in taxes, compliance, and business goals when evaluating each structure during the selection process. It will help you narrow down the options, leading to informed decision-making.

Once you have chosen the relevant company structure, it is time to arrange the relevant paperwork. The documents for incorporation will vary depending on the jurisdiction and industry you choose. Some standard paperwork for a company formation includes:

  • Business place proof, such as a utility bill.
  • Details of the directors and shareholders.
  • Memorandum and Articles of Association.
  • Share structure and capital information (depending on the structure).

Once you have arranged the required documents, you can apply either manually or electronically. For online submission, you must visit the official website of the Companies House. Similarly, for manual submission, you need to post the prescribed application (IN01) to the authority’s physical address.

Upon successful verification, the authority will grant the incorporation certificate, citing the CRN.

How does a Company Registration Number in the UK differ from a UTR, VAT, and ERN?

Businesses often confuse CRN with UTR, VAT, ERN, and other similar terms. The table below illustrates the differences between them.

Attribute

Company Registration Number (CRN)

Unique Taxpayer Reference (UTR)

Value-Added Tax (VAT) 

Employer Reference Number (ERN)

Issuer

Companies House

HMRC

HMRC

HMRC

Format

8 characters (e.g. 12345678 or SC123456)

10 digits (e.g. 9012345678)

9 digits (e.g. GB123456789)

3 digits / letters+numbers (e.g. 123/CD678)

Purpose

Company identification upon incorporation

Tax-related identification

For VAT-registered businesses

Identifies employers for PAYE

How it Differs from CRN

Issued by HMRC, for tax, not for incorporation

Only for VAT registration

Only for payroll; not a general company identifier

Conclusion

The relevance of the company registration number (CRN) extends beyond being a unique code. It can help companies reap numerous tangible benefits. Obtaining a company registration number in the UK can be a complex and challenging process, due to the ever-changing regulations and intricate procedures. That’s where Business Setup Worldwide (BSW) steps in!

BSW has been spearheading business consultancy services for over 8 years. Our track record is immaculate and speaks for itself. So, whether you seek a business permit or need assistance with a brand-new venture, BSW can make your efforts count, driving results that matter. Contact us today, and we will ensure you receive the support you need.

Aaron Richards
Aaron Richards|Business Consultant

Aaron Richards is a seasoned expert with over six years of experience who specializes in offshore company formation, trust and foundation setup, and corporate services. Through his blogs, Aaron shares valuable insights to guide clients in making informed decisions about their global business needs.

Frequently Asked Questions

1. What is a company registration number in the UK?

The UK’s RoC issues this unique code, viz., Companies House, at the time of incorporation.

2. What is the purpose of having a CRN?

CRN serves as a company’s legal identifier. It helps with various tasks, including opening a bank account, paying taxes, applying for loans, addressing statutory compliances, etc.

3. Does CRN have any validity?

Technically, CRN comes with a lifetime validity, meaning it will stay in force as long as the company continues to operate.

4. How can I apply for CRN?

You do not have to apply for CRN separately. You will receive it along with your incorporation certificate. 

5. Where should I use CRN?

The law requires entities to affix a CRN on crucial business paperwork, including invoices, purchase orders, letterheads, and so on.