- Strictly speaking, the United Kingdom does not issue a single universal Tax Identification Number (TIN). Instead, different tax numbers serve this purpose depending on the taxpayer’s status.
- In most cases, it is individuals, not companies, who are asked to provide a TIN. When this happens, the most commonly accepted numbers are your unique taxpayer reference (UTR) or the National Insurance Number (NINO).
- If you are asked to provide a TIN, always check if a specific format is required, as different institutions may recognise different UK tax id numbers.
What is a Tax Identification Number (TIN) UK?
A Tax Identification Number (TIN) UK is a unique identifier assigned by a tax authority to individuals and businesses for tax administration, compliance, and record-keeping. In the UK, HM Revenue & Customs (HMRC) is responsible for issuing tax reference numbers that serve as TINs, depending on the taxpayer’s status. These numbers track tax obligations, payments, and filings within the UK tax system.
Unlike some countries, the UK does not have a single universal TIN. Instead, different identifiers apply based on whether the taxpayer is an individual or a business.
TINs for UK Individuals
- HMRC assigns UTR, a taxpayer identification number for self-assessment and tax reporting.
- National Insurance Number (NINo) or Social Security Number, used for taxation, social security, and employment-related contributions.
TINs for limited companies in the UK
- Company Unique Taxpayer Reference (Company UTR Number): Issued by HMRC for Corporation Tax and business tax filings.
- Company Registration Number (CRN): Issued by Companies House to identify a registered business.
- Value added tax registration (VAT Number): Assigned by HMRC to VAT-registered businesses for tax reporting on goods and services.
- PAYE Reference Number: Given to employers to manage income tax and National Insurance contributions for employees.
Each identifier serves a specific tax purpose and may be required for domestic and international tax transactions.
How do I identify my UK tin number?
To identify your TIN number in the UK, you need to check the format and purpose of the tax ID number you are being asked to provide. The UK does not issue a single, universal TIN; instead, different tax numbers serve this function based on whether you are an individual or a business.
| TIN Type | Uses | Format |
|---|---|---|
| UTR number | Self-employed & company tax | 10-digit number (e.g., 1234567890) |
| VAT Number | VAT-registered businesses | GB + 9 digits (e.g., GB123456789) |
| Company Registration Number (CRN Number) | Company identification | 8 numbers (e.g., 12345678) |
| ERN (Employer Reference Number) | PAYE tax purposes | e.g., 123/AB4567 |
| NIN (National Insurance Number) | Personal tax & benefits | A combination of letters and numbers (2 letters, 6 digits, 1 letter) (e.g., AB123456C) |
What Is the Process of Obtaining a TIN in the UK?
Unlike some countries, the UK does not issue a universal TIN. Instead, individuals and businesses receive different tax reference numbers depending on their tax obligations and status.
The process of obtaining a tax number varies depending on whether you are an individual or a business. Below is a breakdown of how taxpayers can get their respective tax identifiers.
How to Get a TIN as an Individual
Every individual in the UK must have a National Insurance Number (NINO), which serves as a unique tax reference for employment, social security, and tax purposes.
- Most UK citizens automatically receive their NINO three months before their 16th birthday if their parents claim Child Benefit.
- Individuals must apply online via HMRC if the application is not received by age 19. The application process may require an identity interview, and applicants must provide supporting documents such as a passport, biometric residence permit (BRP), or national identity card.
- After approval, the NINO is mailed or found on payslips, P60s, tax letters from HMRC, pension statements, and correspondence from the DWP or Jobcentre Plus.
Individuals 16 years and above with a right to work share code or permission to study in the UK can apply online to obtain an NINO. They may be invited for an interview to prove their identity and eligibility. Documents needed include a passport, biometric residence permit (BRP), or national identity card from the EU, Norway, Liechtenstein or Switzerland.
For self-employed individuals or business partners, an additional tax reference is required:
- Unique Taxpayer Reference (UTR) Number, if you are self-employed, a sole trader, or a partner in a business, you must register for Self-Assessment via HMRC’s Government Gateway (check the guide).
- Once registered, HMRC assigns a 10-digit UTR number, essential for filing tax returns.
- If your income exceeds £1,000 per year, Self-Assessment registration is mandatory.
How to Get a Limited Company TIN
When you register a limited company (LTD) with Companies House, you automatically receive two key tax identifiers:
- Company UTR number: Issued by HMRC for tax reporting.
- Company Registration Number (CRN): Provided by Companies House upon incorporation.
Since these numbers are assigned automatically, you don’t need to apply separately. However, businesses may need to register for additional tax numbers depending on their activities:
- VAT Registration Number: If your business exceeds the VAT threshold (£90,000 turnover) or opts for voluntary registration, you must apply via HMRC’s VAT online service.
- PAYE Reference or Employer Reference Number (ERN): Required if your company hires employees. Employers must register for PAYE before their first payday, and processing takes up to 15 working days.
For sole traders and LLPs, a company UTR is not automatically issued. Instead, they must register for Self-Assessment via HMRC’s Government Gateway to receive their UTR number.
What is the difference between TIN and HMRC UTR?
Strictly speaking, there is no distinction between a UK TIN and a UTR, since the latter is a specific subtype of a tax identification number used to identify individual or business taxpayers in the UK. Consequently, depending on the context, these terms are occasionally used interchangeably.
What is the difference between a TIN number, VAT number, Company Registration Number, and PAYE reference number?
A TIN number is a taxpayer identification number. Because there is no specific TIN number in the UK, the term depends on the context in which you need it. It can refer to a VAT number, a company registration number, or an employer’s PAYE reference number. A TIN number simply represents the tax identifier required for a particular purpose.
How do I find my tax identification number?
To find your Tax Identification Number (TIN) in the UK, check your official tax documents and correspondence from HM Revenue & Customs (HMRC) or the Department for Work and Pensions (DWP).
- Your National Insurance Number (NINo): can be found on payslips, P60s, tax returns, or letters from DWP or HMRC.
- Your Unique Taxpayer Reference (UTR): for personal and company tax appears on correspondence from HMRC, Self-Assessment forms, and notice to file a tax return.
- Your VAT Registration Number, PAYE Reference, or Company Registration Number (CRN): is listed on official business-related documents from HMRC or Companies House.
If you can’t find your TIN, you can retrieve it online via your HMRC account or request it directly from HMRC.
What are the purpose and functions of tin within the UK tax system?
A unique tax identification number links individuals and businesses to their tax records and obligations. It tracks compliance, ensures accurate tax reporting, and verifies identity for financial and legal transactions.
Banks, financial institutions, and government agencies may require your TIN for tax-related purposes, including opening accounts, processing payments, or meeting regulatory requirements.
Is tax ID the same as NI number?
Sometimes, a National Insurance Number (NINo) is used as a tax reference for individuals, but it is not always the same as a Tax Identification Number (TIN).
To determine whether your NI number is the correct tax ID required, check the format or description of the requested number. If the request relates to self assessment tax return or corporation tax, a UTR number may be needed instead.
In most cases, when a foreign institution, such as a bank, requests a Tax Identification Number (TIN) from a UK resident, they typically refer to the National Insurance Number (NINo).
How do I find my tax code in the UK?
You can find your tax code on your payslip, P60, or P45, as well as in official HMRC correspondence, such as tax notices or coding letters. Alternatively, you can check it online by logging into your HMRC account via the Government Gateway. If uncertain, you can also contact HMRC directly by phone for assistance.
What is the difference between a TIN and the National Insurance Number within the UK tax system?
TIN is a broad term for different numbers used in UK tax law to identify individuals and entities for taxation or insurance contributions. The insurance number, therefore, is a subtype of TIN, signifying one of several identification numbers employed within the system.
What is a UTR number, and how do UK companies use it?
It is a crucial number for tax management in the UK. HMRC issues it to self-employed individuals and companies to identify them for taxation. Here is how it is useful.
For self-employed individuals or limited liability partners, you will need your UTR for self-assessment tax returns or when engaging in business activities.
Limited companies will be required to provide a copy of their Corporation Tax UTR in the following circumstances —
- Identify the company for corporation tax matters, such as corporation returns and managing tax payments.
- Register for VAT once an entity becomes eligible or voluntarily;
- Register and make payments under the Construction Industry Scheme (CIS);
- Tell HMRC that your business is inactive and to file dormant company accounts; and
- For any correspondence with tax authorities.
Is my UK income Tax number on my P45
You will find your national insurance number which is a type of TIN on your P45.