VanlyThe van is bought, the first job is done, and the money has landed in your account. Somewhere in the back of your mind a voice is asking whether you need to tell the taxman, and if so, when. The short answer is yes, and there is a deadline most people only find out about after they have missed it. Here is how to register as self employed in the UK in 2026, what HMRC actually needs from you, and the few things that trip up tradesmen in particular.
Registering is the easy part. Keeping clean records from day one is the part most tradies put off until January. If you want the admin to run itself from the start, try Vanly free for 14 days. No card needed to start.
Do you even need to register?
Not everyone who earns a bit on the side has to register. HMRC gives you a £1,000 trading allowance. If your gross trading income for the tax year (6 April to 5 April) stays under £1,000, and you have no other reason to file a tax return, you do not need to register at all.
Gross means before you take off any expenses. So if you turned over £900 doing a few cash jobs at weekends, you are under the line and you can leave it. The moment you go over £1,000, the picture changes. You must register, and you must declare the lot.
For anyone going at the trade properly, this threshold is academic. One bathroom or a week of day rate work clears it. But it matters if you are testing the water alongside a PAYE job, doing the odd foreigner before you go full time. Keep a rough tally. The day you cross £1,000 is the day the clock starts on registering.
See the gov.uk page on the trading allowance for the official wording. If in doubt, register. There is no penalty for being in the system when you did not strictly need to be. There is a penalty for the other way round.
The deadline that catches people out
This is the bit nobody tells you in the pub. You must register by 5 October after the end of the tax year in which you started.
Work it through. The tax year runs 6 April to 5 April. Say you started trading in July 2025. That falls in the 2025/26 tax year, which ended on 5 April 2026. Your deadline to register is 5 October 2026. So you can be working for over a year before the deadline bites, which is exactly why so many people sail past it without noticing.
Miss it and HMRC can charge a failure to notify penalty, worked out as a percentage of the tax you owe. If you registered late but paid everything on time, the penalty is often reduced to nothing. But you do not want to be relying on HMRC's good mood. Register the moment you know you are over the £1,000 line and the whole problem disappears.
A simple rule for a tradesman: the week you decide this is your job now, not a hobby, register. Do not wait for the deadline. It costs nothing and it gets the slowest part of the process moving.
How to register, step by step
Registering is free and it is done online. You do not need an accountant for this part, and you should not pay anyone to do it for you. It takes about twenty minutes.
- Go to gov.uk and start the register for Self Assessment process. Choose the option that says you are self employed or a sole trader.
- Create a Government Gateway account if you do not already have one. This is your login for everything HMRC. Keep the user ID and password somewhere safe, not on a scrap of paper in the van.
- Fill in the form. HMRC will run you through the SA1 or CWF1, which asks for your personal details, the date you started trading, and the type of work you do. Be honest about the start date. It sets your first filing year.
- Submit it and wait for the post.
After you register, HMRC sends your Unique Taxpayer Reference, the UTR, by post within about 10 working days. It is a ten digit number and it is your permanent tax identity as a self employed person. You will quote it on every tax return for the rest of your trading life, so write it down in more than one place.
You will also get an activation code for your online account, again by post. Do not bin it thinking it is junk. You need it to log in and file.
National Insurance: Class 2 and Class 4
National Insurance trips people up because the rules changed and most old guides have not caught up. Here is where it stands for 2026/27.
There are two classes that apply to the self employed.
| Class | When it applies | What you pay in 2026/27 |
|---|---|---|
| Class 2 | Profits above £7,105 (the small profits threshold) | Nothing. You get a credit automatically toward your state pension |
| Class 2 (voluntary) | Profits below £7,105 | £3.65 a week if you choose to pay, to protect your pension record |
| Class 4 | Profits above £12,570 | 6% on profits from £12,570 to £50,270, then 2% above £50,270 |
The key change: since April 2024 you no longer pay the old flat rate Class 2 stamp. If your profits clear the small profits threshold, you get the state pension credit without paying for it. If your profits are low, paying the voluntary £3.65 a week is usually worth it to keep your pension years ticking over. See the gov.uk National Insurance for the self employed guidance for the current rates.
Class 4 is the one that actually costs you. It is collected through Self Assessment at the same time as your income tax, so you do not need to do anything separate. Just know it is coming, and that it sits on top of the income tax you already expected to pay. Plenty of first year tradies forget the NI and get a nasty surprise in January.
If you work under a contractor, CIS changes the picture
This is the wrinkle that catches tradesmen and almost nobody else. If you do subcontract work for a main contractor, the Construction Industry Scheme applies on top of registering as self employed.
Under CIS, the contractor deducts money from your invoice before they pay you and sends it to HMRC. If you have registered for CIS, the deduction is 20%. If you have not, it is 30%. That difference is real cash flow, so registering is worth doing the moment you know you are subbing.
The important thing to understand: those deductions are not lost. They are an advance on your tax and National Insurance. When you file your Self Assessment at year end, the tax already taken under CIS is set against your bill. For a lot of subbies the deductions come to more than they actually owe, which means a refund. That is why some tradesmen who work mostly on CIS look forward to their tax return rather than dreading it.
Registering as self employed and registering for CIS are two separate jobs. Do the self employed registration first, then add CIS once you know you are taking subcontract work. Read the difference between sole trader and limited company for a UK tradesman if you are weighing up which structure to trade under, because CIS works slightly differently once you go limited.
What records to keep from day one
The job HMRC sets you is simple to describe and easy to neglect: keep a record of what came in and what went out. You will need it to fill in your tax return, and you must keep it for at least five years after the filing deadline in case HMRC ever asks.
A clean record starts with a clean invoice, so it pays to write a proper quote and invoice from the first job rather than scribbling figures on the back of a fag packet. The minimum a tradesman should hang on to:
- Every invoice you send, with the date and amount
- Every receipt for tools, materials, fuel, and kit
- Your mileage, if you claim it by the mile rather than running the van through the books
- Bank statements for the account the business runs through
- Any CIS deduction statements from contractors
The mistake is leaving it all until January, then losing a Sunday digging receipts out of the glovebox and the bottom of toolbags. The tradies who hate their tax return are almost always the ones who did no records all year. The ones who log it as they go barely notice it.
This is the honest reason to set up a system on day one rather than year one. Sunday admin is a tax you pay in your own time, and it is the easiest one to avoid. Vanly keeps the running record for you: every invoice logged the day you finish the job, every job in one thread, so when the return comes round the numbers are already there. You still want an accountant for the filing itself once the business grows. Vanly just keeps the shoebox from ever forming.
What happens after you register
Once you are in the system, the rhythm of the self employed year is straightforward.
You file one Self Assessment tax return a year, covering the tax year just gone. The online filing deadline is 31 January. That same date is when you pay what you owe. If your bill is over £1,000, HMRC also asks for payments on account, which are advance instalments toward next year's tax, due 31 January and 31 July. The first year this lands it feels like being asked to pay one and a half years of tax at once. Budget for it.
One more thing on the horizon. Making Tax Digital for Income Tax began phasing in from April 2026. If your trading turnover is over £50,000 you now keep digital records and send HMRC a quarterly summary, on top of the annual return. The threshold drops to £30,000 from April 2027. It is a real change to how records work, and it is another reason to get a proper system going now rather than running the year on paper.
Get the registration done, keep the records clean, and the rest is just turning up on the dates. The hard part of being self employed was never the taxman. It is doing the work and getting paid for it.
FAQ
How long does it take to register as self employed?
The online form takes about twenty minutes. The wait afterwards is the slow bit. Your UTR arrives by post within roughly 10 working days, and the activation code for your online account comes separately. Start early, because you cannot file until both have turned up.
Do I need to register if I have a full time job as well?
Yes, if your self employed income goes over the £1,000 trading allowance. Your PAYE job is taxed separately through your wages. The self employed work is extra income HMRC does not know about until you tell them, so it needs its own registration and its own line on your tax return.
What is the difference between registering as self employed and registering as a sole trader?
There is none in practice. Sole trader is simply the legal name for a one person self employed business. When you register for Self Assessment as self employed, you are registering as a sole trader. The two terms get used for the same thing.
When do I actually pay the tax?
Your first tax bill is due by 31 January after the end of your first tax year. So if you started trading in the 2025/26 year, you file and pay by 31 January 2027. That gap is why a first year of trading can feel free until the bill lands. Set money aside as you go, roughly 25 to 30 percent of profit, and the January bill holds no fear. It helps to know your numbers and set a rate that actually covers tax before you quote a single job.
Do I need an accountant to register?
No. Registering is free and simple enough to do yourself on gov.uk, and you should not pay anyone to do that part. An accountant earns their fee later, when the business grows, the numbers get bigger, and the question of going limited comes up. For day one, the only thing you need is your own details and twenty minutes.
What if I registered late?
Register as soon as you realise. HMRC can charge a failure to notify penalty based on the tax you owe, but if you come forward and pay everything on time, that penalty is often reduced to nothing. The longer you leave it, the worse it looks. There is no upside to waiting.
Registering as self employed is a twenty minute job that most people overthink and then leave too late. Do it the week you decide the trade is your living, keep a clean record of money in and money out from the first invoice, and the tax year takes care of itself. When you are ready to stop losing evenings to the paperwork side of it, try Vanly free for 14 days and let the daily admin run itself while you get on with the work.