# Company Registration Number in the UK: A Guide URL: https://www.businesssetup.com/blog/company-registration-number-in-the-uk Description: The UK company registration number is more than just a unique code. Learn why it matters for registered entities and the benefits it offers. Published: 26 May 2025 Updated: 19 May 2026 --- 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. ## **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](/blog/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: 1. ### **Distinct Legal Identity** 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. 2. ### **Seamless Tax filing** 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. 3. ### **Access to Government Schemes and Tax Benefits** 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. 4. ### **Unlock Growth Potential** 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](/uk/company-formation-in-uk) and securing CRN requires following the given steps: 1. ### **Choose Your Company Structure** 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. 2. ### **Prepare the Required Documents** 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). 3. ### **Submit Your Application to Companies House** 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. 4. ### **Receive Your CRN** 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](/contact-us) today, and we will ensure you receive the support you need.