What Is A Company Registration Number (CRN) In The UK?

If you’re running (or about to run) a limited company in the UK, you’ll quickly come across your Company Registration Number, often shortened to “CRN”. It appears on official paperwork, banking forms, and even your invoices.

In this guide, we’ll explain exactly what a CRN is, when you’ll need it, where to find it, and how to avoid the common mistakes we see small businesses make. Understanding your CRN is a simple win that keeps your company compliant and saves time when dealing with banks, HMRC and suppliers.

What Is A Company Registration Number?

Your Company Registration Number (CRN) is a unique identifier issued by Companies House when a company is incorporated in the UK. Think of it as your company’s permanent ID tag on the Companies House register.

A CRN is:

• Unique to your company (no two companies share a CRN).
• Issued automatically on incorporation by Companies House.
• Permanent - it doesn’t change if your company name changes, your registered office moves, or new directors are appointed.

CRNs usually have eight characters. The exact format depends on which UK jurisdiction you registered in (England & Wales, Scotland or Northern Ireland). For example, Scottish companies begin with “SC” and Northern Irish companies with “NI”.

If you operate as a sole trader or a traditional partnership, you won’t have a CRN because those businesses aren’t incorporated with Companies House.

Where Do You Find Your CRN And When Do You Get It?

You receive your CRN as soon as Companies House accepts your incorporation. It’s shown on your Certificate of Incorporation and recorded on the public register. If you can’t locate those documents, don’t stress - there are quick ways to retrieve it.

Ways To Locate Your CRN

• Certificate of Incorporation: Usually emailed to you (or your agent) on the day you incorporate.
• Companies House Service: Search your company name and your CRN appears near the top of your company profile.
• Official Correspondence: Letters or emails from Companies House about filings or reminders will quote your CRN.
• Accountant or Formation Agent: If they incorporated the company, they’ll have it on file.

If you need a quick refresher on the different formats and where to look, you can find your CRN using Companies House in minutes.

When You’ll Receive It

Most online formations are processed within 24 hours (often the same day), and your CRN is issued immediately on approval. If you’re still in the planning phase and want help with the paperwork, our team can help you register a company properly from day one.

Do You Need To Display Your Company Registration Number?

Yes. Under the Companies (Trading Disclosures) Regulations 2008, registered companies must display certain company details on business stationery and online. Your CRN is part of that picture.

Where Disclosure Is Required

• Website: Your registered name and company details must be easy to find on your site (often in the footer or a legal page). It’s good practice to include them alongside your website terms and conditions and other legal notices.
• Emails and Letters: Include the company’s full registered name, registration number, registered office address, and place of registration (e.g., England & Wales) on letters, order forms and emails.
• Invoices: Your CRN should appear on invoices along with your legal name and address. If you’re VAT-registered, add your VAT number too. For a full checklist, see our guide to UK invoice requirements.
• Order Forms and Receipts: The same disclosure rules apply to order documents and receipts issued in the company name.

Failing to make these disclosures can lead to compliance issues and confusion for customers and suppliers. Making the details visible across your channels is an easy compliance win.

CRN Vs Other Numbers: What’s The Difference?

It’s very common to mix up the various numbers you’ll encounter in business. Here’s how a CRN compares to other identifiers.

CRN (Company Registration Number)

• Issued by: Companies House.
• Purpose: Identifies your company on the Companies House register.
• Used for: Company filings, legal documents, banking, contracts, invoices (as part of trading disclosures).

UTR (Unique Taxpayer Reference)

• Issued by: HMRC.
• Purpose: Identifies your company for corporation tax.
• Notes: You’ll receive a UTR after you incorporate and register for corporation tax. It’s different from the CRN and shouldn’t be displayed publicly.

VAT Number

• Issued by: HMRC.
• Purpose: Identifies your business for VAT if you’re registered.
• Notes: Must be shown on VAT invoices. Not all businesses need (or have) one if they aren’t VAT registered.

EORI Number

• Issued by: HMRC.
• Purpose: Required for businesses importing/exporting goods with the EU and some other international trade.
• Notes: Not needed for domestic-only businesses.

PAYE Reference

• Issued by: HMRC.
• Purpose: Identifies your business for Pay As You Earn (PAYE) and NIC if you employ staff.
• Notes: Used for payroll reporting; separate from your CRN.

In short: the CRN is about your legal identity as a company. Tax numbers (UTR, VAT, PAYE) are about your tax and payroll obligations. Keep them distinct in your records so you use the right one in the right place.

When Will Your CRN Be Used In Practice?

You’ll use your CRN more than you might think. Here are the most common scenarios for UK small companies.

1) Opening A Business Bank Account

Banks will ask for your CRN (and other documents) to verify the company’s identity. It’s one of the quickest ways they confirm your company exists on the public register.

2) Contracts And Supplier Accounts

Larger customers and suppliers often ask for your CRN on vendor forms or within the contract schedules. It helps them run checks and issue purchase orders correctly. It’s also a good habit to include your CRN on standard documents like service agreements and order forms.

3) Invoices And Stationery

As noted above, your CRN should appear on invoices and official stationery alongside the company’s registered name and address. If you’re formalising your invoice layout, review the legal checklist for UK invoice requirements.

4) Companies House Filings

When you file your annual confirmation statement, annual accounts, or changes to directors and shareholders, you’ll use your CRN. It’s the anchor for all filings tied to your company.

5) Legal And Governance Documents

Your CRN is commonly referenced in corporate documents like your Articles of Association, board minutes, and shareholder records (including share certificates and the register of members). It’s a simple way to avoid ambiguity about which company the document concerns.

6) On Your Website

Your CRN belongs with the other key details you publish for transparency and compliance. Keep it accessible on your site (for example, in the footer or legal pages) alongside your registered office address and a link to your website terms and conditions.

Common CRN Mistakes And How To Avoid Them

Most CRN issues are minor and easy to prevent. Here are the pitfalls we see most often.

Using A Trading Name Without The Registered Name

If you brand your business under a trading name, that’s fine - but your registered name (and CRN) still need to appear on documents where trading disclosures are required. Using only a trading name can confuse customers and delay payments.

Confusing The CRN With VAT Or UTR

It’s common to paste the wrong number onto invoices or websites. Double-check that the number you’re adding is labelled correctly (CRN vs VAT vs UTR). Each has a distinct purpose.

Forgetting To Update Templates

If you tweak your invoice or email templates, make sure the CRN doesn’t drop off. Build it into the footer so it’s always present.

Assuming The CRN Changes With A Name Change

It doesn’t. Your CRN stays the same throughout the company’s life - even if you change the registered name, move the registered office or appoint new directors. If you rebrand, you’ll need to update your stationery and website, but the CRN will be unchanged.

Not Displaying Details Online

Make it easy for customers and regulators to find your company details on your website. Place your CRN and registered name in the footer, and keep your legal pages (like your terms and policy pages) up to date. If you collect any personal data, ensure your Privacy Policy and cookie notices are compliant with data protection law.

Setting Up A Company: Getting Your CRN Step-By-Step

If you’re still deciding whether to incorporate, here’s a quick overview of how to get from idea to CRN - and set up your legal foundations at the same time.

1) Choose The Right Structure

Not every business needs a limited company from day one, but many do for limited liability, credibility and growth. If you expect to bring in co-founders, raise capital, or hire staff, a company structure is often the right move.

2) Prepare Your Details

Companies House will need your proposed company name, registered office address, director and shareholder details, and your Articles of Association (the company’s internal rulebook). Most startups use the “Model Articles” at incorporation and then tailor them later, but bespoke articles can be a smart choice even at the outset if you have specific governance needs.

3) Incorporate With Companies House

You can file directly online or ask a lawyer to do it for you. Either way, once Companies House approves the application, your CRN is issued immediately and you’ll receive your Certificate of Incorporation. If you want support ensuring everything is set up correctly, we can help you register a company and prepare the right documents to protect you from day one.

4) Put Your Governance Documents In Place

Beyond the incorporation itself, consider whether you need:

• Tailored Articles of Association to set decision-making rules, share rights and board processes.
• A Shareholders Agreement to cover issues like founder exits, vesting, decision deadlocks and share transfers.
• Up-to-date cap table, member register and share certificates to keep your records clean.

These aren’t just “nice to have”. Good governance documents prevent disputes and make funding rounds or exits smoother because investors expect to see them.

5) Sort Your Trading Disclosures And Legal Pages

Update your email footer, invoices and letterheads with the company’s full registered name, CRN, registered office address and country of registration. On your website, publish these details in the footer and ensure your legal pages - including your website terms and conditions - are in place. If you sell online or provide services via your site, check that your order process and consumer-facing policies line up with consumer protection law.

6) Register For Taxes And Banking

Register for corporation tax, VAT (if applicable), and PAYE if you’ll have employees. Open a business bank account using your CRN and supporting documents (Certificate of Incorporation, director ID, proof of address, etc.).

With these steps complete, you’ll be set up to operate confidently - and your CRN will be ready to use across all your filings, paperwork and everyday trading.

Key Takeaways

• Your Company Registration Number (CRN) is the official, permanent identifier Companies House issues when you incorporate - it does not change if your company name or address changes.
• You’ll find your CRN on your Certificate of Incorporation, Companies House listing and official correspondence; if you’ve misplaced it, you can quickly find your CRN online.
• UK trading disclosure rules mean you should display your registered name, CRN and registered office address on your website, emails, letters, order forms and invoices. Use our checklist for UK invoice requirements to stay compliant.
• Don’t confuse your CRN with tax numbers like your UTR, VAT, EORI or PAYE references - each serves a different purpose and is used in different contexts.
• Build your legal foundations early: tailor your Articles of Association, keep accurate shareholder records and share certificates, and publish up-to-date website terms and conditions with clear company details.
• If you’re forming a company now, we can help you register a company and set up the right documents so you’re protected from day one.

If you’d like help with your company setup, governance documents or ongoing compliance, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.