A UTR is a Unique Taxpayer Reference: ten digits, issued by HMRC, used to identify a taxpayer.
The thing most guides bury in a footnote is the thing that causes the most trouble. If you run a limited company and also file a personal tax return, you have two UTRs.
One is yours. One belongs to the company. They are different numbers for different taxes, and putting the wrong one on a return is the classic mistake.
Here is what each one is, where to find it, and how to tell them apart.
Two UTRs, two taxes
| Personal UTR | Company UTR | |
|---|---|---|
| Belongs to | You, the individual | The limited company |
| Tax | Self Assessment, Income Tax | Corporation Tax |
| Issued when | You register for Self Assessment | The company is registered at Companies House |
| Issued to | You | The company's registered office address |
| Format | 10 digits | 10 digits |
| Use it on | Your personal tax return | The company's Corporation Tax return |
Same format, same issuer, completely different purpose. Nothing about the number tells you which is which, which is exactly why they get mixed up.
The rule: the company's return takes the company's UTR. Your return takes yours. A director who files both keeps both, and never substitutes one for the other.
Subject: Self Assessment, Income Tax.
- Triggered by registering for Self Assessment
- Arrives in about 15 days
- Belongs to you, not to any company
Subject: Corporation Tax.
- Triggered by incorporation at Companies House
- Arrives in about 14 days
- Belongs to the company, not to its director
How you get one
You do not apply for a UTR directly. HMRC issues it as a consequence of something else.
| Trigger | What arrives | When |
|---|---|---|
| Registering for Self Assessment | Personal UTR | About 15 days, longer from overseas |
| Registering a limited company at Companies House | Company UTR for Corporation Tax | Within about 14 days, to the registered office |
Two practical consequences for anyone incorporating from abroad.
The company UTR goes to the registered office, not to you. If you used a formation agent's address, the letter lands with them. Make sure they forward it, or that you can retrieve it from your HMRC account.
Overseas timings are longer. HMRC's stated norms assume a UK address. Build slack into any plan that depends on having the number by a fixed date.
Where to find a UTR
| You are | Where to look |
|---|---|
| An individual or sole trader | Personal Tax Account, the HMRC app, previous HMRC correspondence |
| Acting for an organisation | Previous tax returns and HMRC correspondence |
| A limited company | Request the Corporation Tax UTR online through HMRC's service |
It may not be labelled UTR. HMRC notes it "might just be called 'tax reference'". On correspondence it
often appears near the top right, sometimes as ten digits with a space, sometimes with a K suffix on
older payslips and payment references.
Documents that carry it
Personal UTR: notices to file a tax return, statements of account, payment reminders, and your Personal Tax Account.
Company UTR: the initial letter from HMRC after incorporation, notices to deliver a Corporation Tax return, and the Corporation Tax section of the business tax account.
Recovering a lost UTR
The route depends on which one you lost.
Personal UTR. Sign in to your Personal Tax Account or the HMRC app. If you cannot get in, contact HMRC and have your National Insurance number ready, because that is how they will identify you.
Company UTR. HMRC has an online service to request the Corporation Tax UTR. It sends the number to the company's registered office address, which is a deliberate control, not an inconvenience. If you no longer control that address, fix the registered office first.
What will not work. There is no public lookup. Nobody can retrieve a UTR from a company number, and no third party service can obtain one faster than HMRC.
What a UTR is not
It is not the company registration number. That comes from Companies House, is eight characters, and identifies the legal entity rather than the taxpayer.
It is not the employer PAYE reference. That is formatted 123/AB456 and identifies a payroll
scheme.
It is not the VAT number. That is GB plus nine digits and identifies a VAT registration.
It is not public. This is the part with real consequences. A company number is published and searchable. A UTR never appears on a public register. If a counterparty asks you for a supplier's UTR, the only legitimate source is the supplier.
| Number | Public? | Identifies |
|---|---|---|
| Company registration number | ✅ Companies House | The legal entity |
| VAT number | ✅ Checkable with HMRC | A VAT registration |
| Employer PAYE reference | ❌ | A payroll scheme |
| UTR | ❌ Never published | The taxpayer |
When you need a UTR, and when you do not
You need a personal UTR if you file a Self Assessment return: self-employment, untaxed income, certain levels of income, rental income, and the other Self Assessment triggers.
Your company needs its UTR for every Corporation Tax filing and payment.
You do not automatically need a personal UTR just because you are a director. Being a director does not by itself require a Self Assessment return. Many directors do file one, for dividends or other income, but the directorship alone is not the trigger.
That distinction saves a surprising number of people from registering for a return they do not need, and then having to file nil returns for years.
| Do you need one? | Which, and how fast | |
|---|---|---|
| I have a limited company | Yes, automatically | Company UTR, sent to the registered office in about 14 days |
| I must file a Self Assessment return (self-employment, untaxed income, rental income) | Yes | Personal UTR, after registering, in about 15 days |
| I am only a director, with no other trigger | Not required by the directorship itself | Registering anyway commits you to filing |
| I am employed, one job, nothing else | No | PAYE already handles it |
Common mistakes
Putting the personal UTR on the company return. The most frequent, and the one HMRC sees most.
Assuming the company UTR arrives with the incorporation. It does not. Companies House issues the company number; HMRC issues the UTR separately, days later, by post.
Not retrieving it from a formation agent's address. If the registered office belongs to your agent, the HMRC letter goes to them.
Treating it as public. Publishing a UTR on a website or an invoice serves no purpose and exposes a number that exists to identify a taxpayer to HMRC.
Confusing it with the UTR used in banking. In Indian banking, UTR means Unique Transaction Reference, an entirely unrelated payment identifier. If someone in a payments context asks for a UTR, check which one they mean.
The summary
| You want to | Answer |
|---|---|
| Know what a UTR is | ✅ Ten digits from HMRC, identifying a taxpayer |
| Know which UTR to use on a company return | ✅ The company UTR, never yours |
| Find your personal UTR | ✅ Personal Tax Account, HMRC app, HMRC letters |
| Find your company UTR | ✅ Request it online, sent to the registered office |
| Recover a lost personal UTR | ✅ Contact HMRC with your National Insurance number |
| Look up someone else's UTR | ❌ Never published, no public lookup exists |
| Get a UTR just for being a director | ❌ Directorship alone is not a Self Assessment trigger |
Frequently asked questions
What is a UTR number?
A Unique Taxpayer Reference: a ten digit number issued by HMRC to identify a taxpayer, whether an individual registered for Self Assessment or a limited company for Corporation Tax.
What is the difference between a company UTR and a personal UTR?
A personal UTR identifies you for Self Assessment and Income Tax. A company UTR identifies the company for Corporation Tax. A director who files a personal return has both, and must use the company's UTR on the company's return.
How do I get a UTR number?
You do not apply directly. HMRC issues a personal UTR when you register for Self Assessment, and a company UTR when the company is registered at Companies House.
How long does a UTR take to arrive?
Roughly 15 days after registering for Self Assessment, and within about 14 days of company registration for a Corporation Tax UTR. Both take longer for applicants outside the UK.
Where do I find my UTR number?
Individuals and sole traders: the Personal Tax Account, the HMRC app, or previous HMRC correspondence. Limited companies: request the Corporation Tax UTR online through HMRC. It may appear simply as a "tax reference".
I have lost my UTR, what do I do?
For a personal UTR, sign in to your Personal Tax Account or contact HMRC with your National Insurance number to hand. For a company UTR, use HMRC's online request service, which sends the number to the registered office address.
Can I look up another company's UTR?
No. A UTR is never published on any public register, unlike a company registration number. The only legitimate source is the company itself.
Is the UTR the same as the company registration number?
No. The company registration number comes from Companies House, is eight characters and identifies the legal entity. The UTR comes from HMRC, is ten digits and identifies the taxpayer.
Do I need a UTR if I am just a company director?
Not automatically. Being a director does not by itself require a Self Assessment return. You will need a personal UTR only if another trigger applies, such as untaxed income.
Why does my UTR sometimes have a K at the end?
Older HMRC payslips and payment references appended a letter to the ten digit number. The UTR itself remains the ten digits.
Sources
The UTR format, issue timings and recovery routes are taken from GOV.UK guidance consulted in August 2026. Timings are HMRC's stated norms and can be longer in practice, particularly for applicants outside the UK. This is informational, not tax advice.