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A Complete Guide on How to Apply for a UTR Number and Register as Self-Employed in the UK

  • Writer: Taxd UK
    Taxd UK
  • May 16, 2025
  • 6 min read

Becoming self-employed in the UK can be an exciting step toward taking control of your career and financial future. However, before you can start your journey, there are a few important steps you must take to ensure you're legally registered and compliant with HMRC regulations. One of the key requirements for anyone working as a sole trader or self-employed individual in the UK is obtaining a Unique Taxpayer Reference (UTR) number. But how to apply for utr number? And what’s the process for register as self-employed in the UK?


how to apply for utr number- By TaxdUK
how to apply for utr number- By TaxdUK

In this detailed guide, we’ll walk you through the steps you need to take to successfully apply for your UTR number, explain why you need it, and how to register as self-employed in the UK. This guide is designed to equip you with all the knowledge you need to get started without confusion.

What is a UTR Number?

A Unique Taxpayer Reference (UTR) is a 10-digit number issued by HM Revenue and Customs (HMRC) to individuals and businesses for tax purposes. It’s a unique identifier that helps HMRC keep track of your tax obligations. If you’re self-employed, this number is essential for filing your Self Assessment tax returns, paying your tax and National Insurance contributions, and ensuring you stay compliant with UK tax laws.

Your UTR number is like your personal ID number for tax purposes. You'll use it when you communicate with HMRC, whether you’re submitting tax returns, paying taxes, or registering for self-assessment. It’s a crucial step that makes sure your tax payments are correctly allocated to your account.



Why Do You Need a UTR Number?

When you become self-employed or start a business in the UK, you are required to register with HMRC so they can track your tax status. Without a UTR number, you won’t be able to:

  1. File your self-assessment tax return: If you’re earning income as a self-employed individual or a sole trader, you need to complete a self-assessment tax return each year. The UTR number is essential for this process.

  2. Pay taxes: You will be responsible for paying Income Tax, National Insurance, and any other applicable taxes. The UTR number ensures HMRC can track your payments.

  3. Claim deductions or reliefs: Without your UTR, you can’t apply for any tax reliefs or deductions that are available to self-employed individuals.

In short, the UTR number is a fundamental element of your self-employment journey. Without it, you won’t be able to fulfill your legal obligations as a taxpayer.



The process of obtaining a UTR number is fairly straightforward, but it can take some time, so it’s important to plan ahead. Below are the steps you need to follow to obtain your UTR:

Step 1: Register as Self-Employed with HMRC

Before you can apply for a UTR number, you must first register as self-employed in the UK. You can do this in a few ways, depending on whether you’re registering as a sole trader or planning to set up a limited company.

  • Sole Trader Registration: Most people who work for themselves without setting up a formal business structure will register as a sole trader. To register as self-employed in the UK, you must inform HMRC by completing a self-assessment registration.

Here’s how to register:

  1. Go to the HMRC website: Navigate to the HMRC official site and search for “Register as Self-Employed.”

  2. Provide your details: You’ll need to provide personal information such as your name, address, date of birth, and National Insurance number.

  3. Choose a business name (if applicable): If you're trading under a name that isn’t your own, you’ll be asked to provide it.

  4. Submit your registration: Once you submit your registration, HMRC will send you a confirmation letter with your UTR number. This can take up to 10 working days (or longer during busy periods).

Once you’ve registered as self-employed, HMRC will automatically send you your UTR number by post. It’s important to keep this number safe, as you’ll need it for various tax-related activities.

  • Registering as a Limited Company: If you're setting up a limited company, the process will differ slightly. In this case, you must also register your company with Companies House, and then you can register for self-assessment with HMRC. You’ll also be given a UTR number as part of this process.

Step 2: Wait for Your UTR Number to Arrive

Once you’ve registered as self-employed with HMRC, it can take up to 10 working days to receive your UTR number in the post. During this waiting period, HMRC will process your registration and issue you the 10-digit number.

If you’re registering in the middle of the tax year, HMRC will send you a Self Assessment tax return along with your UTR number. You can start filing your tax returns once you have received it.



If you don’t receive your UTR number within the expected timeframe, you can contact HMRC directly to request it.



Common Mistakes to Avoid When Applying for a UTR Number

While applying for a UTR number is a fairly straightforward process, there are a few common mistakes people make when registering as self-employed that can delay their registration or cause other issues. Be mindful of the following:

  1. Not Registering Early Enough: It’s important to register as self-employed as soon as you begin working for yourself. If you fail to register within three months of starting work, you could face a penalty.

  2. Missing Your UTR Number: Once your UTR number arrives, keep it safe! You’ll need it for every tax return you file, and losing it could delay your filing process. Always make a record of your UTR and store it securely.

  3. Filing Incorrect Information: When registering, ensure that all the information you provide is correct. Mistakes such as misspelling your name or entering incorrect income details can cause delays or complications in processing your UTR number.

  4. Forgetting to Update HMRC if Your Situation Changes: If your circumstances change (e.g., you become employed part-time or your income increases), it’s crucial to keep HMRC updated so that your self-assessment tax returns reflect the correct income.




What to Do After Receiving Your UTR Number

Once you have your UTR number, you’ll be able to:

  1. Submit Self-Assessment Tax Returns: You’ll need to file a self-assessment tax return every year to declare your income and calculate how much tax you owe.

  2. Pay Your Taxes: You will use your UTR number when making payments to HMRC for your Income Tax and National Insurance contributions.

  3. Claim Tax Relief: The UTR number is essential for claiming any tax reliefs, such as business expenses, allowances, and deductions.



How Long Does It Take to Get a UTR Number?

It typically takes up to 10 working days to receive your UTR number after registering with HMRC. However, delays can occur during peak registration periods (e.g., just before the end of the tax year). If you haven’t received your UTR number within this time frame, don’t hesitate to get in touch with HMRC to check the status of your registration.



Do You Need a UTR Number for Every Type of Self-Employment?

If you’re a sole trader or operating a freelance business, you will need to register for self-assessment and obtain a UTR number. However, if you plan to set up a limited company, the process is slightly different. Limited companies have their own unique registration process with Companies House and a separate set of tax obligations.

In both cases, you’ll need a UTR number for filing tax returns and paying taxes, but the process of acquiring it differs based on the structure of your business.



Conclusion

Navigating the process of how to apply for a UTR number and register as self-employed in the UK can seem daunting, but it’s an essential part of becoming a compliant and successful self-employed individual. With the right knowledge and preparation, you can easily register with HMRC and obtain your UTR number, which will help you manage your taxes and remain compliant.

By following the steps outlined in this guide, you’ll be able to register efficiently, avoid common mistakes, and stay on top of your tax obligations. Remember to always keep your UTR number safe and ensure that you’re submitting your tax returns on time to avoid penalties. Now that you have the information you need, take action today and start your self-employed journey with confidence!


 
 
 

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