How To Recover a Lost UTR Number From HMRC
If you have exhausted all the checks above and still cannot locate your UTR, you will need to request it directly from HMRC. Here is what to expect before you make contact, because the process works differently to what most people assume.
How HMRC Handles UTR Requests
- HMRC will not provide your UTR over webchat — for security reasons, this is not an option regardless of how you verify your identity.
- They rarely give it over the phone — HMRC advisers may confirm you are registered, but will typically not read out your UTR during a call.
- It is normally reissued by post — HMRC will send your UTR to your registered address, which means you need to factor in delivery time.
Important: Allow 7 to 14 working days for your UTR to arrive by post. If a Self Assessment deadline is approaching, do not leave this until the last minute. The 31 January filing deadline will not be extended because your UTR is in the post.
Before You Contact HMRC, Check Your Address
This is the step most people overlook. If your address held by HMRC is out of date, your replacement UTR letter will go to the wrong address and you will be back to square one.
If you have moved recently, update your address with HMRC before requesting your UTR. You can do this through your Personal Tax Account or by calling the HMRC Self Assessment helpline.
How To Contact HMRC To Request Your UTR
- By phone: Call the HMRC Self Assessment helpline on 0300 200 3310 (Monday to Friday, 8am to 6pm). Have your National Insurance number ready to verify your identity.
- Online: Log in to your Personal Tax Account and request a reminder through your Self Assessment profile.
- By post: Write to HMRC at Self Assessment, HM Revenue and Customs, BX9 1AS, United Kingdom.
Worth knowing: If you use an accountant, they can contact HMRC on your behalf as your authorised agent, which can sometimes speed up the process. Not yet working with one? Get in touch with Accounting Wise and we can help.
What If You Are a Limited Company Director?
If it is your company UTR that has gone missing rather than your personal one, the recovery process is slightly different. Limited companies are issued a separate UTR for Corporation Tax purposes, and it is worth checking a few specific places before contacting HMRC.
Where To Find Your Company UTR
- Your CT41G letter — this is the letter HMRC sends to every new limited company shortly after incorporation, informing you of your Corporation Tax obligations. Your company UTR will be printed on it. Check your original company setup paperwork first.
- Your company’s online tax account — if your company is registered for HMRC Online Services, your company UTR will be visible once logged in under the Corporation Tax section.
- Previous Corporation Tax returns — your company UTR appears on every CT600 return ever filed. If you have copies, check there first.
- Your accountant — if you work with an accountant or have ever used one to file your company accounts, they will almost certainly have your company UTR on file. A quick email or call to them is often the fastest route.
Still Cannot Find It?
If none of the above options work, contact HMRC’s Corporation Tax helpline directly on 0300 200 3410 (Monday to Friday, 8am to 6pm). Have your Companies House registration number to hand, as HMRC will use this to verify your company before reissuing the UTR by post.
Remember: Your company UTR and your personal UTR are two entirely separate numbers. As a director, you will need both — your company UTR for Corporation Tax filings and your personal UTR for your own Self Assessment tax return. Do not mix them up when dealing with HMRC.
Is Your UTR the Same as Your National Insurance Number?
No, and this is a common source of confusion worth clearing up. Your UTR and your National Insurance number are two completely separate references, issued for different purposes, and one cannot be substituted for the other.
- Your National Insurance number — a nine-character reference (in the format QQ 12 34 56 A) that identifies you for National Insurance contributions, state benefits, and employment records. You are assigned one automatically before your 16th birthday.
- Your UTR (Unique Taxpayer Reference) — a 10-digit number issued by HMRC specifically when you register for Self Assessment or Corporation Tax. It relates purely to your tax return obligations.
While both numbers are used by HMRC, they serve entirely different functions within the tax system. If a form or your accountant asks for your UTR, your National Insurance number will not do, and vice versa.
Not sure which number you need? As a general rule: if it relates to employment, payroll, or state benefits, you need your National Insurance number. If it relates to filing a tax return or dealing with Self Assessment, you need your UTR. If you are unsure, speak to Accounting Wise and we will point you in the right direction.
What If a Tax Deadline Is Close?
If the 31 January Self Assessment deadline is approaching and you still cannot locate your UTR, the single most important thing you can do is act immediately. Do not wait for the letter to arrive before taking further steps.
What To Do Right Now
- Contact HMRC immediately — call the Self Assessment helpline on 0300 200 3310 and explain that you have a deadline approaching. Make clear you are actively trying to comply.
- Document the date you made contact — note the time, date, and the name of the adviser you spoke to. This creates a paper trail that demonstrates you acted in good faith.
- Keep evidence of your request — save any confirmation emails, webchat transcripts, or written correspondence from HMRC as proof that you initiated the recovery process.
Will You Still Face a Penalty?
Possibly, but demonstrating reasonable effort matters. HMRC has the ability to reduce or cancel penalties where a taxpayer can show they took genuine steps to meet their obligations. Simply ignoring the deadline because your UTR is missing is not a valid defence, but a clear, documented record of your attempts to resolve the issue gives you a far stronger position if you need to appeal a penalty.
Do not ignore it. A missing UTR is not a reason to miss a filing deadline without making contact first. The standard late filing penalty starts at £100, and it increases the longer the return remains outstanding. Acting quickly, and being able to prove it, is always in your best interest.
If you are worried about an upcoming deadline and need urgent help, contact Accounting Wise today. We can liaise with HMRC on your behalf and help make sure your return is filed as quickly as possible once your UTR is recovered.
Can Your Accountant Retrieve Your UTR?
If you work with an accountant, or have done in the past, this is often the simplest and fastest solution of all. Your accountant will almost certainly have your UTR stored in your client records, and a quick call or email to them could save you the wait for an HMRC postal reminder entirely.
When Your Accountant Can Help
- You have an existing accountant – if you have authorised an accountant to deal with HMRC on your behalf, they will have your UTR on file. Contact them directly and they can provide it immediately.
- You have recently switched accountants – your previous adviser will still hold your UTR in their records. Even if the relationship has ended, they are obliged to provide you with your own information on request.
- You have used a one-off tax return service – even accountants engaged for a single filing will have recorded your UTR as part of completing that work.
Worth knowing: When an accountant is formally authorised as your HMRC agent, they can also contact HMRC directly on your behalf to request or verify your UTR. This can be significantly faster than going through the process yourself, particularly during busy periods around the Self Assessment deadline.
If you do not currently have an accountant and are finding tax admin like this more trouble than it is worth, it might be time to get one. Accounting Wise works with sole traders, freelancers, and limited company directors across the UK to take the stress out of Self Assessment and Corporation Tax for good.
How To Avoid Losing Your UTR Number Again
Once you have recovered your UTR, take five minutes to store it properly. It is one of those small admin tasks that saves a significant amount of stress further down the line, particularly when a tax deadline is approaching and the last thing you need is another thing to chase.
The Best Ways To Store Your UTR Securely
- Use a password manager — tools like 1Password, Bitwarden, or LastPass are designed exactly for this. Store your UTR alongside your Government Gateway login details so everything is in one secure, accessible place.
- Save it in a secure digital file — a password-protected document or encrypted folder on your computer or cloud storage keeps it accessible without leaving it exposed.
- Keep a copy with your tax records — whether you file digitally or keep physical paperwork, make your UTR part of your standard tax file so it surfaces naturally every time you need it.
- Avoid unsecured notes — a sticky note on your monitor, an unprotected notes app, or a plain text email to yourself are not suitable places to store a financial identifier of this importance.
Treat your UTR like a financial identifier, not a casual reference. While it is not as sensitive as your bank account details, your UTR combined with other personal information could be used in identity fraud. Share it only with HMRC, your accountant, or trusted financial professionals who legitimately need it.
For more straightforward guidance on staying on top of your tax obligations year-round, take a look at the official HMRC Self Assessment guidance on GOV.UK.
Security Warning: Protecting Your UTR From Scams
Tax-related scams remain a serious and growing problem in the UK. Once you have recovered your UTR, it is just as important to keep it out of the wrong hands as it is to store it safely for yourself.
Never Share Your UTR With
- Cold callers – HMRC will never call you out of the blue and ask you to confirm your UTR or other personal tax details over the phone.
- Unverified email requests – phishing emails impersonating HMRC are extremely common, particularly around the Self Assessment deadline. Always check the sender address carefully and never click links in unsolicited emails claiming to be from HMRC.
- Social media messages – HMRC will never contact you through Facebook, Instagram, WhatsApp, or any other social media platform to request personal or tax information.
HMRC Will Never
- Threaten you with arrest via email or text message
- Demand payment through gift cards, cryptocurrency, or bank transfers to unfamiliar accounts
- Ask for personal or financial details via social media
- Leave aggressive or threatening voicemails demanding immediate payment
If something feels wrong, it probably is. If you receive a suspicious communication claiming to be from HMRC, report it directly to HMRC’s phishing team at phishing@hmrc.gov.uk or forward suspicious texts to 60599. You can also check HMRC’s official guide to recognising genuine HMRC contact if you are unsure whether a communication is legitimate.
The Action Fraud helpline (0300 123 2040) is the UK’s national reporting centre for fraud and cybercrime. If you believe you have been targeted by a tax scam, report it there as well.
Final Thoughts: Lost Your UTR? Here Is What To Do Next
Losing your UTR number is inconvenient, but it is far from catastrophic. HMRC have clear processes in place to help you recover it, and in many cases the number was never truly lost at all, just buried in a pile of old correspondence or a forgotten online account.
The Key Steps, In Order
- Check previous HMRC correspondence — letters, tax returns, notices to file, and Corporation Tax reminders all carry your UTR.
- Log in to your online tax account — your Personal Tax Account or Government Gateway account will display your UTR once you are logged in.
- Contact HMRC if necessary — call the Self Assessment helpline on 0300 200 3310 or the Corporation Tax helpline on 0300 200 3410 if you cannot locate it yourself.
- Allow time for postal reissue — if HMRC need to send your UTR by post, factor in 7 to 14 working days and make sure your registered address is up to date.
Above all, act early. The closer you are to the 31 January Self Assessment deadline, the less room you have to absorb delays.
Not sure whether you need a personal UTR or a company UTR? Struggling to access your Government Gateway account? These are exactly the kinds of issues that a good accountant resolves quickly, and the kind of stress you should not have to deal with alone when a deadline is on the horizon.
At Accounting Wise, we work with sole traders, freelancers, and limited company directors across the UK to keep their tax affairs in order year-round. Whether you need help recovering your UTR, filing your Self Assessment, or simply want someone to take the admin off your plate for good, we are here to help.
Get in touch with Accounting Wise today and let us take it from here.
Related resources: HMRC Self Assessment overview | Find your UTR number on GOV.UK | Recognising genuine HMRC contact | Appealing an HMRC penalty
