How to Register as Self Employed
Register as self employed through HMRC’s Self Assessment service and obtain your UTR.
To register as self employed in the UK, you normally tell HMRC that you need to use Self Assessment as a sole trader. Registration allows HMRC to create or reactivate your Self Assessment record and issue the information needed to submit a tax return. The process can usually be started online, although the correct route depends on whether you are new to Self Assessment or have registered previously.
Being self employed does not necessarily mean forming a company or registering a business with Companies House. A sole trader and a limited company are different legal and tax structures. You can also remain employed through PAYE while registering separate freelance, contracting or trading activity as self employment. This guide concentrates on HMRC self employed registration rather than calculating tax or completing the subsequent annual return.
Who Needs to Register as Self Employed?
You normally need to register for Self Assessment if your gross sole-trader income exceeds £1,000 in a tax year and you are not already reporting it correctly.
HMRC’s current Self Assessment criteria state that a sole trader must send a return where gross trading income exceeds £1,000 for the tax year. Gross income means business receipts before deducting expenses. The test can apply to freelancers, contractors, online sellers, gig workers and people providing paid services, provided their activity amounts to trading.
The £1,000 figure relates to the trading allowance and is not a tax-free profit threshold in every situation. Someone with gross trading income of £1,000 or less may still choose or need to register, for example to claim a trading loss, pay voluntary National Insurance contributions or prove self employment for a benefit application. Certain income connected with an employer, partnership or close company cannot use the allowance in the usual way.
Before registering, determine whether the activity is genuinely self employment. Employment status depends on the working arrangement rather than the label written on an invoice or contract. HMRC provides an official employment-status checker for situations where the distinction is uncertain.
When Should You Register?
You should normally tell HMRC by 5 October following the end of the tax year in which the filing obligation arose.
The UK tax year runs from 6 April to the following 5 April. According to HMRC’s registration service, a person who needs to complete a return for 2025/26 and has not filed before—or was previously registered but did not need to file for 2024/25—must notify HMRC by 5 October 2026. The same pattern applies in later years.
| When the self employment began | Tax year | Normal registration deadline | Online return and payment deadline |
|---|---|---|---|
| 6 April 2025 to 5 April 2026 | 2025/26 | 5 October 2026 | 31 January 2027 |
| 6 April 2026 to 5 April 2027 | 2026/27 | 5 October 2027 | 31 January 2028 |
Registration does not need to wait until 5 October. Registering earlier allows more time to obtain or confirm a Unique Taxpayer Reference and arrange access to the online service. Anyone who has missed the notification date should register promptly rather than waiting for the next tax year.
How to Register as Self Employed Online
Use HMRC’s online Self Assessment registration service, answer the eligibility questions and follow the route provided for a self-employed sole trader.
- Check whether your income and circumstances require a Self Assessment return.
- Open the official GOV.UK service for registering for Self Assessment.
- State whether you have previously registered or received a UTR.
- Select the route that applies to self employment or sole-trader activity.
- Sign in with the requested HMRC credentials or create sign-in details where offered.
- Enter your personal and business information carefully.
- Submit the registration and retain its confirmation or reference.
- Wait for HMRC to confirm that the Self Assessment record has been created or reactivated.
The official service now begins with questions that determine the correct registration or reactivation route. This is safer than assuming that every applicant must complete the same form. People previously registered for Self Assessment should normally use their existing UTR rather than applying for another one.
Registration is free through GOV.UK. Avoid websites that imitate HMRC and charge simply to submit information that can be provided directly. Always begin through the official Self Assessment registration page and check the web address before entering your National Insurance number or other personal information.
What Is the CWF1 Form?
CWF1 is the Self Assessment registration or reactivation route associated with self-employed sole traders, but HMRC’s current service decides how an individual should proceed.
The term “CWF1 form” is still used for registering self-employed people for Self Assessment and National Insurance purposes. HMRC’s agent guidance identifies CWF1 for self-employed clients and SA1 for people registering for reasons other than self employment. However, individual taxpayers are now directed through HMRC’s central online registration service rather than being expected to choose a form without checking their circumstances.
CWF1 should not be confused with a tax return. It notifies HMRC of the self-employment details needed to establish or reactivate the Self Assessment record. The subsequent return reports the income, expenses and other relevant information for the tax year.
People who cannot complete the online process should follow the alternative method presented by HMRC or contact HMRC for assistance. Do not submit repeated applications because confirmation has not arrived immediately. Duplicate requests can complicate the record rather than accelerate the process.
What Information Do You Need?
You will normally need personal identification details, the date trading began and basic information about the self-employed business.
Prepare your National Insurance number, full name, date of birth, contact information and current address. The service may ask for the business name, trading address, type of work and date the activity began. Where an existing UTR has already been issued, keep it available so HMRC can identify the correct Self Assessment record.
The business start date should reflect when trading actually began, not necessarily when you first considered the idea, created a social-media page or opened a bank account. HMRC may use this date to determine the first tax year that needs reporting. Keep evidence supporting the date, such as initial invoices, sales records, contracts and business correspondence.
| Information | Why it may be needed |
|---|---|
| National Insurance number | Helps HMRC match the registration to the individual |
| Existing UTR | Allows a previous Self Assessment record to be reactivated |
| Trading start date | Identifies the first relevant tax year |
| Nature of the business | Describes the self-employed activity |
| Business and contact addresses | Supports registration and HMRC correspondence |
| Personal contact details | Allows HMRC to communicate about the application |
Can You Be Employed and Self Employed?
Yes. You can remain employed through PAYE while separately registering qualifying self-employed activity with HMRC.
Your employer will normally continue deducting Income Tax and employee National Insurance from wages through PAYE. The income and expenses from your separate business are reported through Self Assessment when required. HMRC’s calculation considers the relevant income together and gives credit for tax already deducted through PAYE.
Being taxed through your main job does not automatically cover the tax due on freelance or trading profit. The final rate on that profit can depend on total income from all sources. The second-job tax guide explains the distinction between another PAYE job and self-employed side income, while the self-employed tax calculator can estimate tax and Class 4 National Insurance.
You do not normally need a second National Insurance number or a separate personal identity for the business. However, you should maintain clear income and expense records for the self-employed activity. A dedicated account can make bookkeeping easier, even where a separate business bank account is not legally required for a sole trader.
Do Company Directors Register as Self Employed?
A company director is not automatically self employed and should not use the sole-trader registration route merely because they hold a directorship.
A limited company has a separate legal identity, and a director’s remuneration is commonly processed through the company’s payroll where applicable. Director status alone does not create a general requirement to register as self employed. The director may nevertheless need Self Assessment because of untaxed income, dividends, a notice to file or another qualifying reason.
According to the government’s Self Assessment guidance for directors, directors may need a return in circumstances including receiving dividends or other untaxed income. The exact reporting requirement depends on the amount, available allowances and how the income is otherwise taxed. A director who needs Self Assessment but is not self employed should follow the non-self-employed registration route, generally associated with form SA1.
Someone who operates a separate sole-trader business alongside a directorship may need to report both sets of income. Readers choosing between structures can use the sole trader versus limited company guide without treating incorporation as a simple registration substitute.
What Happens After Registration?
HMRC will establish or reactivate your Self Assessment record, confirm the UTR and tell you how to access and submit the required return.
A new Self Assessment taxpayer is normally assigned a ten-digit Unique Taxpayer Reference. HMRC may send confirmation by letter or make information available through the personal tax account or HMRC app. Processing times vary, particularly during busy periods, so use HMRC’s expected-reply service if confirmation has not arrived within the stated timeframe.
A UTR is not the same as a Government Gateway user ID or National Insurance number. Each identifier serves a different purpose, and the details should be stored securely. If you already have a UTR from an earlier period in Self Assessment, reactivation should retain that identifier rather than create a new one.
After registration, keep records of all business income and allowable expenses from the start of trading. HMRC’s self-employed record guidance explains what must be retained. The broader self-employed tax guide covers how profit, Income Tax and National Insurance are dealt with after registration.
Registering and Making Tax Digital
Self Assessment registration and Making Tax Digital enrolment are related but separate requirements.
Making Tax Digital for Income Tax began its phased mandatory introduction on 6 April 2026. A sole trader must first establish whether Self Assessment registration is required. HMRC then determines whether the person’s qualifying self-employment and property income brings them into the digital reporting rules for the relevant start year.
Registering as self employed does not automatically confirm that Making Tax Digital applies immediately. The applicable starting date depends on qualifying income from an earlier tax year and any exemption. The dedicated MTD for Income Tax guide explains the current thresholds, digital records and software requirements without complicating the initial registration process.
Common Registration Mistakes
Common mistakes include using the wrong registration route, creating a duplicate record and entering an inaccurate trading start date.
Do not register as a new taxpayer if you already have a UTR and only need to reactivate Self Assessment. Avoid using SA1 solely because it appears easier when the actual reason for registering is self employment. The central HMRC service should direct the taxpayer to the appropriate route.
Another mistake is waiting until the tax-return deadline to start registration. Delayed access to a UTR or online account can make filing more difficult, although the obligation to pay on time may remain. Registering late does not automatically produce a fixed penalty in every case, but a failure-to-notify penalty may arise where tax remains unpaid as a result.
Keep the application confirmation, check HMRC correspondence and confirm that a notice to file has been issued where required. Registration alone does not complete the tax return or pay the resulting liability. The full filing timetable is covered in the Self Assessment tax return guide.
This guide provides general information about registering as self employed and joining Self Assessment. Registration routes, digital services and individual obligations can change. Check GOV.UK for the current process and consult a qualified tax adviser or HMRC if you are unsure about your employment status or reporting responsibilities.
Written by
Sarah Collins
Sarah Collins covers self assessment, self-employed tax, side hustle income and small business finances in the UK.
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