Company Number, UTR, VAT, PAYE and EORI Numbers Explained

Starting a UK limited company comes with a collection of numbers that can be confusing, especially when you are setting up your business from overseas or dealing with Companies House, HM Revenue and Customs (HMRC), banks, suppliers and customers for the first time. You may be asked for your company registration number, Unique Taxpayer Reference (UTR), VAT number, PAYE reference or EORI number. Although these identifiers can sometimes be linked, they are not interchangeable, and each serves a different purpose.

Some are issued automatically when a company is incorporated or registered for tax. Others are only required when your business reaches a particular stage, employs people or trades internationally. This guide explains what each number means, who issues it, when you need it and where to find it.

Quick Comparison: The Five Main UK Business Numbers

The important distinction is that company registration identifies the legal entity, while the other numbers relate to tax, payroll or customs administration.

1. What Is a Company Registration Number?

A company registration number, commonly called a CRN or company number, is the unique identifier Companies House assigns when it incorporates a UK company. For example, a company might have a number such as 12345678 or 1234567A. The exact format depends on the type of company and its registration circumstances.

The number identifies the legal entity on the Companies House register. It is not a tax reference and does not, by itself, prove that the company is trading, profitable or compliant with every legal obligation.

What is a company number used for?

You may need it to:

• Identify your company on the Companies House register.
• Complete certain bank account and supplier onboarding processes.
• Provide company details on business documents and correspondence.
• Help HMRC connect tax records with the correct legal entity.
• Check a company's registered details and filing history.

You can find a company's number using the Companies House register. It is public information, so you do not need the director's permission to look it up.

Does a company number change?

Generally, the CRN remains with the legal entity throughout its existence, including when the company changes its name. A new company, however, receives its own number. Do not confuse the company number with the company's name. A name can change; the number is the more reliable identifier for matching records to the same legal entity.

2. What Is a Company UTR?

A Unique Taxpayer Reference (UTR) is a tax identifier issued by HMRC. A UK limited company's Corporation Tax UTR is normally a 10-digit number. Unlike the company registration number, the UTR is used for tax administration rather than public company registration. HMRC uses it to identify the company on Corporation Tax records and related correspondence.

When does a limited company need a UTR?

A company generally needs its UTR to deal with Corporation Tax matters, including registering for Corporation Tax, submitting Company Tax Returns and corresponding with HMRC about its tax affairs. Incorporating a company at Companies House and receiving a UTR are separate steps. Do not assume that having a company number means you already have your UTR to hand.

HMRC usually sends the UTR to the company's registered business address after establishing the relevant tax record. If the letter has not arrived, or you have misplaced it, use the official HMRC UTR guidance to find out how to retrieve it.

Is a company UTR the same as a personal UTR?

No. An individual may have a personal UTR for Self Assessment, while a limited company has its own Corporation Tax UTR. For example, a director who submits a personal Self Assessment tax return and runs a limited company may have both a personal UTR and a company UTR. They relate to different taxpayers and should not be substituted for each other. A UTR is not the same as a CRN, VAT number or PAYE reference. Treat it as confidential business information and share it only when there is a legitimate reason to do so.

3. What Is a VAT Number?

A VAT number is issued by HMRC when a business registers for Value Added Tax (VAT). It identifies the business for VAT administration, including VAT returns and transactions where VAT registration details are required. A UK VAT number commonly consists of nine digits. It may be displayed with a GB prefix in relevant circumstances, although the correct format depends on the transaction and applicable VAT arrangements.

Does every UK company need a VAT number?

No. Incorporating a limited company does not automatically register it for VAT. A business may need to register when its taxable turnover exceeds the applicable VAT registration threshold, or it may be able to register voluntarily if it meets the relevant conditions. The threshold and registration rules can change, so check HMRC's current VAT registration guidance rather than relying on an old figure.

A company that provides services to a small number of clients may not need VAT registration simply because it is incorporated. However, businesses selling goods, working with overseas customers or operating across different VAT jurisdictions may need to consider additional rules.

What is a VAT number used for?

A VAT number may be needed to:

• Submit VAT returns to HMRC.
• Charge VAT where applicable.
• Support eligible claims to recover input VAT.
• Provide VAT details to business customers and suppliers.
• Complete certain cross-border trade and customs processes.

VAT registration is separate from Corporation Tax registration. A company can have a UTR without having a VAT number. For example, a newly incorporated consultancy could have a company number and UTR but no VAT number because it is not VAT-registered. That is not unusual.

4. What Is a PAYE Reference Number?

PAYE stands for Pay As You Earn. It is HMRC's system for collecting Income Tax and National Insurance contributions from employment income. A PAYE reference identifies an employer's PAYE scheme. It is issued when the business registers as an employer and is commonly written in a format similar to 123/AB45678, although the precise characters vary.

When does a company need a PAYE reference?

A limited company does not automatically need a PAYE scheme just because it has been incorporated. It may need to register as an employer when it starts paying employees or when its circumstances otherwise require it to operate PAYE.

A company with a director taking a salary through payroll may also need to consider PAYE requirements. The answer depends on the payment arrangements and applicable payroll rules, so directors should not assume that PAYE is relevant only when the company hires staff. HMRC explains employer registration and the circumstances in which a PAYE scheme is needed in its official PAYE guidance.

Is the PAYE reference the same as the Accounts Office reference?

No. These two references are related but serve different purposes.

• PAYE reference: identifies the employer's PAYE scheme.
• Accounts Office reference: helps HMRC allocate PAYE payments to the employer's account.

You may need both when managing payroll and making payments to HMRC. Using the wrong reference can make it harder for a payment to be matched to the correct account. If you use a payroll provider or accountant, make sure they have the correct employer details and references before payroll begins.

5. What Is an EORI Number?

EORI stands for Economic Operators Registration and Identification. An EORI number identifies a business or other operator for customs activities, such as making import or export declarations.

For a business involved in relevant customs procedures, having an EORI number can be necessary before goods are moved or customs declarations are made. A company that only provides services and does not undertake activities requiring customs registration will not normally need one.

Does every UK company need an EORI number?

No. An EORI number is relevant to businesses involved in qualifying customs activity, not simply to every company registered in the UK. You may need one if your business imports goods, exports goods or otherwise undertakes activities covered by customs legislation. The precise requirement depends on where the goods are moving and the nature of the customs activity. For example, a UK online retailer importing products from overseas may need an EORI number, while a UK-based consultant selling digital services may not.

What is the difference between a GB EORI and an XI EORI?

The prefix indicates which customs arrangements the number relates to:

• GB EORI: used for relevant customs activities in Great Britain, which comprises England, Scotland and Wales.
• XI EORI: used for qualifying customs activities involving Northern Ireland under the applicable arrangements.

An XI EORI has specific eligibility requirements, and a business generally needs to apply for a GB EORI first. A VAT registration is not a universal prerequisite for obtaining an EORI number. You can check the requirements and apply through the official HMRC EORI application service. One detail worth remembering: if a VAT-registered business's VAT status changes, its EORI arrangements may also need attention. Check HMRC's current guidance rather than assuming an existing EORI will always remain valid.

How These Five Numbers Work Together

Consider a UK limited company called Northstar Trading Ltd. It receives a company registration number when incorporated. HMRC establishes its Corporation Tax record and provides a company UTR. Later, the company registers for VAT because its circumstances meet the applicable requirements. When it begins employing staff, it registers as an employer and receives a PAYE reference. When it starts importing stock, it checks whether it needs an EORI number for the relevant customs activity.

Each number serves a different administrative purpose. Obtaining one does not automatically mean the company has all the others. A useful way to remember them is:

• CRN: Which legal company is this?
• UTR: Which taxpayer's Corporation Tax record is this?
• VAT number: Which business is registered for VAT?
• PAYE reference: Which employer's payroll scheme is this?
• EORI: Which operator is identified for customs activities?

This distinction is particularly important for overseas founders. Incorporating a UK company does not automatically settle every tax, payroll or customs registration question. Requirements depend on what the company actually does, where it operates and whether specific legal thresholds or obligations apply.

How to Keep Your Company's Numbers Organised

Losing a reference can delay a VAT application, payroll setup, customs declaration or conversation with HMRC. A simple recordkeeping process can prevent unnecessary problems.

1. Create a secure company records folder. Store your incorporation documents, HMRC letters, VAT certificate, payroll references and customs records in clearly labelled sections.
2. Record what each number is for. Avoid saving several references under a generic label such as “company tax number”.
3. Restrict access to confidential information. Your CRN is public, but a UTR and other tax or payroll details should be shared only where appropriate.
4. Check the details before submitting forms. Confirm that you are entering the company UTR rather than a director's personal UTR, and the PAYE reference rather than the Accounts Office reference.
5. Update your records when circumstances change. VAT registration, changes to payroll arrangements or changes in import and export activity may affect which registrations your company needs.

For founders managing a UK company from abroad, reliable mail handling and access to official correspondence are also important. Platforms such as IncorpUK, which supports company formation and management for global founders, can form part of a wider administrative setup. You should still understand which registrations your business needs and keep control of its official tax records.

Frequently Asked Questions

1. Is a company registration number the same as a UTR?

No. Companies House issues the company registration number to identify the legal entity. HMRC issues the UTR to identify the company for tax administration. Both may be needed when dealing with UK authorities, but they serve different purposes.

2. Can a company have a UTR without a VAT number?

Yes. A limited company may have a Corporation Tax UTR even if it has never registered for VAT. VAT registration is a separate process and depends on the business's circumstances.

3. Is a PAYE reference compulsory for every limited company?

No. A company generally needs a PAYE scheme when it has an obligation to operate PAYE. Incorporation alone does not mean every company must register as an employer.

4. Do I need an EORI number if I already have a VAT number?

Possibly. VAT registration and EORI registration serve different purposes. If your business undertakes relevant customs activities, you may need an EORI even if you already have a VAT number. Not every VAT-registered business needs one.

5. Where can I find my company registration number?

Search for the company on the Companies House register. The number appears in the company's public record and incorporation details.

6. Where can I find my company's UTR?

Check previous Corporation Tax letters, tax returns and other HMRC correspondence. If you cannot find it, follow the instructions on GOV.

7. Can I use my personal UTR for my limited company?

No. A director's personal UTR and the company's Corporation Tax UTR identify different taxpayers. Use the reference appropriate to the individual or company named in the form.

8. Does a UK company need all five numbers before it can start trading?

No. The company number is assigned on incorporation, but VAT, PAYE and EORI requirements depend on the company's activities and circumstances. A company UTR is relevant to its Corporation Tax affairs. Identify the registrations required for your business and complete them at the appropriate time.

Conclusion

The company registration number, UTR, VAT number, PAYE reference and EORI number may all appear in UK business paperwork, but they are not substitutes for one another. Your company number identifies the legal entity. Your UTR relates to Corporation Tax. A VAT number identifies a VAT-registered business, a PAYE reference identifies an employer's payroll scheme, and an EORI number supports relevant customs activities.

The practical lesson is simple: know which number you have, what it is used for and when your business needs it. Keep each reference secure, check official HMRC and Companies House guidance when your circumstances change, and avoid assuming that one registration automatically covers another.

For founders building a UK company, whether locally or from overseas understanding these identifiers early makes tax administration, payroll, supplier onboarding and international trade much easier to manage.