Applying for a UTR number online application is one of the most important steps for anyone starting self-employment or freelancing in the UK. Your UTR (Unique Taxpayer Reference) identifies you to HMRC and ensures your tax affairs are managed correctly. However, many applicants make common mistakes that delay approval or cause problems later during tax filing.
What Is a UTR Number and Why It Matters
A UTR (Unique Taxpayer Reference) is a ten-digit number issued by HMRC to individuals and businesses who need to file self-assessment tax returns. You’ll need this number to:
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Submit your tax return
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Register as self-employed or as a limited company
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Receive income from freelance or contract work
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Deal with HMRC regarding taxes
Without it, you won’t be able to complete your self-assessment. That’s why completing your UTR number online application correctly the first time is essential.
Common Mistakes to Avoid During the UTR Number Online Application
When applying for your UTR, even a small mistake can delay your registration. Below are the most common issues applicants face and how to prevent them.
1. Entering Incorrect Personal Details
A common error is providing the wrong personal information, such as your name, date of birth, or address. Make sure the details on your UTR number online application exactly match your government records. Inconsistencies can lead to verification delays and even rejection.
2. Forgetting to Register for Self-Assessment First
You can’t get a UTR without first registering for self-assessment. Some people mistakenly apply for a UTR before registering as self-employed with HMRC. Always register for self-assessment first — the UTR will then be issued automatically.
3. Submitting Multiple Applications
Another mistake is sending more than one UTR number online application because you haven’t received confirmation yet. HMRC can take up to 10 working days (sometimes longer) to process your request. Submitting multiple applications can confuse the system and cause unnecessary delays.
4. Not Checking Email and Postal Updates
HMRC often sends important updates or requests for additional information via email or post. Ignoring these messages could lead to your application being paused or cancelled. Regularly check your inbox and ensure your contact details are correct on your UTR number online application.
5. Using the Wrong HMRC Portal
There are separate portals for individuals, partnerships, and limited companies. Applying through the wrong one can cause your application to be misdirected. Make sure to use the correct HMRC link for your business type before starting your UTR number online application.
Expert Tips to Ensure a Smooth UTR Application
To help you avoid the pitfalls above, here are some professional recommendations.
1. Double-Check All Your Information
Before submitting, carefully review your details. Even minor errors like misspelled names or incorrect NI numbers can slow down your UTR number online application.
2. Keep Proof of Submission
Always save screenshots or confirmation emails after completing your online application. These documents can help if you need to contact HMRC later to check the progress of your application.
3. Use the Correct Address Format
HMRC sometimes rejects applications due to unclear address formatting. Make sure your address matches the Royal Mail format exactly to avoid issues with verification.
4. Be Patient with Processing Time
Typically, your UTR will arrive by post within 10 working days (21 days if you’re abroad). Avoid resubmitting your UTR number online application during this period, as that may trigger duplicate entries.
5. Set Up a Government Gateway Account
A Government Gateway ID makes it easier to track your application status and access HMRC services. You’ll need this login to complete your UTR number online application, so set it up in advance.
Step-by-Step Overview of the UTR Number Online Application Process
Here’s a quick guide to the entire process so you can follow it smoothly from start to finish.
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Go to the HMRC website.
Navigate to the Self-Assessment registration page. -
Sign in or create a Government Gateway account.
This is required to access most tax services. -
Select “Register for Self-Assessment.”
Choose whether you’re registering as an individual, partner, or company director. -
Complete the form.
Enter your personal information, contact details, and business type accurately. -
Submit and wait for confirmation.
You’ll receive a confirmation message after successfully completing your UTR number online application. -
Receive your UTR by post.
Once verified, HMRC sends your Unique Taxpayer Reference number to your registered address.
What to Do If You’ve Made a Mistake
If you realize you’ve made an error after submission, don’t panic. Contact HMRC immediately via the Self-Assessment helpline and provide your National Insurance number along with your submission date. It’s much easier to fix a small mistake early than to wait for your application to be rejected and have to reapply.
Why the Online Application Is Better Than Paper Forms
The UTR number online application process is faster, more secure, and easier to track than paper submissions. You get instant confirmation, fewer errors, and can handle everything digitally through your Government Gateway account. HMRC also prioritizes online applications for quicker processing.
How Long Does It Take to Get a UTR Number?
Most applicants receive their UTR number within 10 working days, but it can take longer during busy periods such as the end of the tax year. For overseas applicants, it might take up to 21 days. Always apply early to avoid delays in your tax registration.
How to Use Your UTR Number Once You Receive It
Once you’ve successfully completed your UTR number online application and received your number, keep it safe. You’ll need it every time you file your Self-Assessment tax return, communicate with HMRC, or submit financial documents. Store it securely and avoid sharing it unless necessary.
FAQs
1. What is a UTR number used for?
A UTR number is used to identify you or your business for tax purposes. You’ll need it to file your Self-Assessment and communicate with HMRC.
2. How can I check if I already have a UTR number?
You can find it on previous tax returns, HMRC letters, or by signing in to your Government Gateway account. Avoid submitting another UTR number online application if you already have one.
3. Can I apply for a UTR number without being self-employed?
No, you generally need to be self-employed or have income outside of PAYE to apply. However, company directors and partners in a business also need one.
4. What should I do if my UTR number hasn’t arrived?
Wait at least 10 working days before contacting HMRC. If it still hasn’t arrived, call the Self-Assessment helpline and provide details of your UTR number online application.
5. Can I apply for someone else’s UTR number?
No, each individual or business must complete their own application for privacy and security reasons. Accountants can assist, but the applicant must authorize the process.
Final Thoughts
Applying for your UTR number online application may seem simple, but small mistakes can lead to big delays. By taking the time to double-check your information, using the correct HMRC portal, and keeping proof of your submission, you’ll ensure a faster and smoother experience.
Remember — your UTR is the foundation of your tax identity in the UK. Handle it carefully, apply correctly, and avoid the common errors that many first-time applicants make.

